ANALYSIS DEVICE AND ANALYSIS METHOD FOR QUALITY INDEX OF NATURAL GAS PRODUCT AND APPLICATION

Abstract

The present invention provides a device and method for analyzing quality indicators of a natural gas product and an application. The device comprises a sample loading assembly, and first, second, third, fourth, and fifth chromatographic column analysis systems connected in parallel, wherein the first chromatographic column analysis system is configured for separating sulfides from natural gas; the second chromatographic column analysis system is configured for separating hydrocarbons having C.sub.3 and higher from the natural gas; the third chromatographic column analysis system is configured for separating oxygen, nitrogen, methane, and carbon monoxide from the natural gas; the fourth chromatographic column analysis system is configured for separating carbon dioxide and ethane from the natural gas; and the fifth chromatographic column analysis system is configured for separating helium and hydrogen from the natural gas; each chromatographic column analysis system is provided with a quantitative tube, a carrier gas tube, and a chromatographic column.

Claims

1. A device for analyzing quality indicators of a natural gas product, the device comprising a sample loading assembly, and first, second, third, fourth, and fifth chromatographic column analysis systems connected in parallel, wherein the first chromatographic column analysis system is configured for separating sulfides from the natural gas; the second chromatographic column analysis system is configured for separating hydrocarbons having C.sub.3 and higher from the natural gas; the third chromatographic column analysis system is configured for separating oxygen, nitrogen, methane, and carbon monoxide from the natural gas; the fourth chromatographic column analysis system is configured for separating carbon dioxide and ethane from the natural gas; and the fifth chromatographic column analysis system is configured for separating helium and hydrogen from the natural gas; wherein each chromatographic column analysis system is provided with a quantitative tube, a carrier gas tube, and a chromatographic column, the quantitative tube is configured for storing a natural gas sample, and the carrier gas tube is configured for delivering a carrier gas to the chromatographic column analysis system to subject the natural gas sample in the quantitative tube to a component separation within the chromatographic column; the sample loading assembly is connected to the quantitative tubes of the first, second, third, fourth, and fifth chromatographic column analysis systems in a connection/disconnection controllable manner to provide the natural gas sample to the quantitative tubes of the first, second, third, fourth, and fifth chromatographic column analysis systems; and each chromatographic column analysis system is connected to a corresponding detector, respectively.

2. The device according to claim 1, wherein the sample loading assembly is connected to the quantitative tubes of the first, second, third, fourth, and fifth chromatographic column analysis systems such that the quantitative tubes of the first, second, third, fourth, and fifth chromatographic column analysis systems are connected in series; wherein the sample loading assembly comprises a natural gas intake tube, a natural gas discharge tube, and first, second, third and fourth quantitative tube connecting tubes, the first, second, third and fourth quantitative tube connecting tubes are configured for connecting the quantitative tubes in series respectively, the natural gas intake tube is connected to an inlet end of the quantitative tubes connected in series, and the natural gas discharge tube is connected to an outlet end of the quantitative tubes connected in series.

3. The device according to claim 1, wherein the chromatographic column of the first chromatographic column analysis system comprises a sulfur column; in the first chromatographic column analysis system, one end of the quantitative tube is connected to the carrier gas tube via a connection/disconnection controllable connecting tubing, the other end of the quantitative tube is connected to an inlet end of the sulfur column via a connection/disconnection controllable connecting tubing, and an outlet end of the sulfur column is connected to the sulfur chemiluminescence detector via a connection/disconnection controllable connecting tubing; wherein the sulfur column enables separation of carbon oxysulfide, hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, methyl ethyl sulfide, dimethyl disulfide, ethyl sulfide, carbon disulfide, n-butyl mercaptan, tert-butyl mercaptan, isopropyl mercaptan, and thiophene; the chromatographic column of the second chromatographic column analysis system comprises a first pre-separation column and a first chromatographic analytical column; in the second chromatographic column analysis system, one end of the quantitative tube is connected to the carrier gas tube via a connection/disconnection controllable connecting tubing, the other end of the quantitative tube is connected to an inlet end of the first pre-separation column via a connection/disconnection controllable connecting tubing, an outlet end of the first pre-separation column is connected to an inlet end of the first chromatographic analytical column via a connection/disconnection controllable connecting tubing, the carrier gas tube is connected to the outlet end of the first pre-separation column and the inlet end of the first chromatographic analytical column respectively via a connection/disconnection controllable connecting tubing, and the inlet end of the first pre-separation column and an outlet end of the first chromatographic analytical column are connected to the hydrogen flame ionization detector respectively via a connection/disconnection controllable connecting tubing; wherein the first pre-separation column enables separation of C.sub.6.sup.+ hydrocarbon components from C.sub.5.sup. hydrocarbon components; and the first chromatographic analytical column enables separation of propane, isobutane, n-butane, neopentane, isopentane, and n-pentane; the chromatographic column of the third chromatographic column analysis system comprises a second pre-separation column and a second chromatographic analytical column; in the third chromatographic column analysis system, one end of the quantitative tube is connected to the carrier gas tube via a connection/disconnection controllable connecting tubing, the other end of the quantitative tube is connected to an inlet end of the second pre-separation column via a connection/disconnection controllable connecting tubing, an outlet end of the second pre-separation column is connected to an inlet end of the second chromatographic analytical column via a connection/disconnection controllable connecting tubing, the carrier gas tube is connected to the outlet end of the second pre-separation column and the inlet end of the second chromatographic analytical column respectively via a connection/disconnection controllable connecting tubing, and an outlet end of the second chromatographic analytical column is connected to the thermal conductivity cell detector via a connection/disconnection controllable connecting tubing; wherein the second pre-separation column enables separation of oxygen, nitrogen, methane, and carbon monoxide from the natural gas; and the second chromatographic analytical column enables separation of oxygen, nitrogen, methane, and carbon monoxide; the chromatographic column of the fourth chromatographic column analysis system comprises a third pre-separation column and a third chromatographic analytical column; in the fourth chromatographic column analysis system, one end of the quantitative tube is connected to the carrier gas tube via a connection/disconnection controllable connecting tubing, the other end of the quantitative tube is connected to an inlet end of the third pre-separation column via a connection/disconnection controllable connecting tubing, an outlet end of the third pre-separation column is connected to an inlet end of the third chromatographic analytical column via a connection/disconnection controllable connecting tubing, the carrier gas tube is connected to the outlet end of the third pre-separation column and the inlet end of the third chromatographic analytical column respectively via a connection/disconnection controllable connecting tubing, and an outlet end of the third chromatographic analytical column is connected to the thermal conductivity cell detector via a connection/disconnection controllable connecting tubing; wherein the third pre-separation column enables separation of ethane and carbon dioxide from the natural gas; and the third chromatographic analytical column enables separation of ethane and carbon dioxide; the chromatographic column of the fifth chromatographic column analysis system comprises a fourth pre-separation column and a fourth chromatographic analytical column; in the fifth chromatographic column analysis system, one end of the quantitative tube is connected to the carrier gas tube via a connection/disconnection controllable connecting tubing, the other end of the quantitative tube is connected to an inlet end of the fourth pre-separation column via a connection/disconnection controllable connecting tubing, an outlet end of the fourth pre-separation column is connected to an inlet end of the fourth chromatographic analytical column via a connection/disconnection controllable connecting tubing, the carrier gas tube is connected to the outlet end of the fourth pre-separation column and the inlet end of the fourth chromatographic analytical column respectively via a connection/disconnection controllable connecting tubing, and an outlet end of the fourth chromatographic analytical column is connected to the thermal conductivity cell detector via a connection/disconnection controllable connecting tubing; wherein the fourth pre-separation column enables separation of helium and hydrogen from the natural gas; and the fourth chromatographic analytical column enables separation of helium and hydrogen.

4. The device according to claim 3, wherein the sulfur column is a DB-Sulfur SCD chromatographic column; the DB-Sulfur SCD chromatographic column has a length of 50 m to 60 m; the first pre-separation column is selected from one of an OV-1 pre-separation column and a DB-1 capillary column; the OV-1 pre-separation column has a length of 1.0 to 2.0 m; the DB-1 capillary column has a length of 3.0 to 5.0 m; the first chromatographic analytical column is selected from one of an HP-AI/S chromatographic column, an HP-PLOT Al.sub.2O.sub.3S capillary column, a PONA capillary column and a plot Q capillary column; the HP-Al/S chromatographic column has a length of 30 m to 50 m; the HP-PLOT Al.sub.2O.sub.3 S capillary column has a length of 25 m to 50 m; he PONA capillary column has a length of 50 m to 100 m; the plot Q capillary column has a length of 25 m to 30 m; the second pre-separation column is selected from one of a Porapak N column, a Porapak Q column and a Porapak QS column; the Porapak N column has a length of 3 m to 5 m; the second chromatographic analytical column is an MS-13X molecular sieve column; the MS-13X molecular sieve column has a length of 3.0 m to 5.0 m; the third pre-separation column is selected from one of a Porapak N column, a Porapak Q column and a Porapak QS column; the Porapak N column has a length of 1 m to 2 m; the third chromatographic analytical column is selected from one of a Porapak N column, a Porapak Q column and a Porapak QS column; the Porapak N column has a length of 2 m to 3 m; the fourth pre-separation column is selected from one of a Porapak N column, a Porapak Q column and a Porapak QS column; the Porapak N column has a length of 1 m to 2 m; the fourth chromatographic analytical column is an MS-5A molecular sieve column; the MS-5A molecular sieve column has a length of 3.0 m to 5.0 m.

5. The device according to claim 3, wherein the first chromatographic column analysis system comprises a first sample loading valve which is a multi-way valve having a first setting position and a second setting position; in the first chromatographic column analysis system, the first sample loading valve is connected to two ends of the quantitative tube, the carrier gas tube and the chromatographic column, respectively, and the first sample loading valve is used to control the connection/disconnection of the connecting tubing between the parts of the first chromatographic column analysis system and the connection/disconnection of the connecting tubing between the sample loading assembly and the first chromatographic column analysis system; when the first sample loading valve is switched to the first setting position, a gas in the sample loading assembly is enabled to be directly discharged from the first chromatographic column analysis system after passing through the quantitative tube; and when the first sample loading valve is switched to the second setting position, a gas in the carrier gas tube of the first chromatographic column analysis system is enabled to flow into the chromatographic column of the first chromatographic column analysis system through the quantitative tube of the first chromatographic column analysis system.

6. The device according to claim 5, wherein the first sample loading valve is a six-way valve having a first setting position and a second setting position, the six-way valve being provided with a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, and a sixth valve port in clockwise sequence; when the six-way valve is in the first setting position, the sixth valve port is connected to the first valve port, the second valve port is connected to the third valve port, and the fourth valve port is connected to the fifth valve port; when the six-way valve is in the second setting position, the first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, and the fifth valve port is connected to the sixth valve port; and the sixth valve port and the fifth valve port of the first sample loading valve are each connected to the sample loading assembly, the quantitative tube of the first chromatographic column analysis system has one end connected to the first valve port of the first sample loading valve and the other end connected to the fourth valve port of the first sample loading valve, the carrier gas tube of the first chromatographic column analysis system is connected to the second valve port of the first sample loading valve, and the sulfur column is connected to the third valve port of the first sample loading valve.

7. The device according to claim 3, wherein the second chromatographic column analysis system comprises a second sample loading valve which is a multi-way valve having a first setting position and a second setting position; in the second chromatographic column analysis system, the second sample loading valve is connected to two ends of the quantitative tube, the carrier gas tube, two ends of the first pre-separation column, the inlet end of the first chromatographic analytical column, and the hydrogen flame ionization detector, respectively, and the second sample loading valve is used to control the connection/disconnection of the connecting tubing between the parts of the second chromatographic column analysis system and the connection/disconnection of the connecting tubing between the sample loading assembly and the second chromatographic column analysis system; when the second sample loading valve is switched to the first setting position, a gas in the sample loading assembly is enabled to be directly discharged from the second chromatographic column analysis system after passing through the quantitative tube, a gas in the carrier gas tube of the second chromatographic column analysis system is enabled to enter the outlet end of the first pre-separation column, flow out from the inlet end of the first pre-separation column and then flow into the hydrogen flame ionization detector, and the gas in the carrier gas tube of the second chromatographic column analysis system is enabled to enter the first chromatographic analytical column through the inlet end of the first chromatographic analytical column; and when the second sample loading valve is switched to the second setting position, the gas in the carrier gas tube of the second chromatographic column analysis system is enabled to flow to the first pre-separation column through the quantitative tube of the second chromatographic column analysis system, enter into the inlet end of the first pre-separation column and flow out from the outlet end of the first pre-separation column, and then enter the first chromatographic analytical column through the inlet end of the first chromatographic analytical column.

8. The device according to claim 7, wherein the second sample loading valve is a ten-way valve having a first setting position and a second setting position, the second sample loading valve being provided with a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port, an eighth valve port, a ninth valve port, and a tenth valve port in clockwise sequence; when the second sample loading valve is in the first setting position, the tenth valve port is connected to the first valve port, the second valve port is connected to the third valve port, the fourth valve port is connected to the fifth valve port, the sixth valve port is connected to the seventh valve port, and the eighth valve port is connected to the ninth valve port; when the second sample loading valve is in the second setting position, the first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, the seventh valve port is connected to the eighth valve port, and the ninth valve port is connected to the tenth valve port; and the tenth valve port and the ninth valve port of the second sample loading valve are each connected to the sample loading assembly, the quantitative tube of the second chromatographic column analysis system has one end connected to the first valve port of the second sample loading valve and the other end connected to the eighth valve port of the second sample loading valve, the carrier gas tube of the second chromatographic column analysis system is connected to each of the seventh valve port and the fourth valve port of the second sample loading valve, the first pre-separation column has the inlet end connected to the second valve port of the second sample loading valve and the outlet end connected to the sixth valve port of the second sample loading valve, the inlet end of the first chromatographic analytical column is connected to the fifth valve port of the second sample loading valve, and the third valve port of the second sample loading valve is connected to the hydrogen flame detector.

9. The device according to claim 3, wherein the third chromatographic column analysis system comprises a third sample loading valve which is a multi-way valve having a first setting position and a second setting position; in the third chromatographic column analysis system, the third sample loading valve is connected to two ends of the quantitative tube, the carrier gas tube, two ends of the second pre-separation column, and the inlet end of the second chromatographic analytical column, respectively, and the third sample loading valve is used to control the connection/disconnection of the connecting tubing between the parts of the third chromatographic column analysis system and the connection/disconnection of the connecting tubing between the sample loading assembly and the third chromatographic column analysis system; when the third sample loading valve is switched to the first setting position, a gas in the sample loading assembly is enabled to be directly discharged from the third chromatographic column analysis system after passing through the quantitative tube, a gas in the carrier gas tube of the third chromatographic column analysis system is enabled to enter into the outlet end of the second pre-separation column and flow out from the inlet end of the second pre-separation column so as to be discharged from the three analysis systems, and the gas in the carrier gas tube of the third chromatographic column analysis system is enabled to enter the second chromatographic analytical column through the inlet end of the second chromatographic analytical column; and when the third sample loading valve is switched to the second setting position, the gas in the carrier gas tube of the third chromatographic column analysis system is enabled to flow to the second pre-separation column through the quantitative tube of the third chromatographic column analysis system, enter the inlet end of the second pre-separation column and flow out from the outlet end of the second pre-separation column, and then enter the second chromatographic analytical column through the inlet end of the second chromatographic analytical column.

10. The device according to claim 9, wherein the third sample loading valve is a ten-way valve having a first setting position and a second setting position, the third sample loading valve being provided with a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port, an eighth valve port, a ninth valve port, and a tenth valve port in clockwise sequence; when the third sample loading valve is in the first setting position, the tenth valve port is connected to the first valve port, the second valve port is connected to the third valve port, the fourth valve port is connected to the fifth valve port, the sixth valve port is connected to the seventh valve port, and the eighth valve port is connected to the ninth valve port; when the third sample loading valve is in the second setting position, the first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, the seventh valve port is connected to the eighth valve port, and the ninth valve port is connected to the tenth valve port; and the tenth valve port and the ninth valve port of the third sample loading valve are each connected to the sample loading assembly, the quantitative tube of the third chromatographic column analysis system has one end connected to the first valve port of the third sample loading valve and the other end connected to the eighth valve port of the third sample loading valve, the carrier gas tube of the third chromatographic column analysis system is connected to the seventh valve port and the fourth valve port of the third sample loading valve, the second pre-separation column has the inlet end connected to the second valve port of the third sample loading valve and the outlet end connected to the sixth valve port of the third sample loading valve, and the inlet end of the second chromatographic analytical column is connected to the fifth valve port of the third sample loading valve.

11. The device according to claim 3, wherein the fourth chromatographic column analysis system comprises a fourth sample loading valve which is a multi-way valve having a first setting position and a second setting position; in the fourth chromatographic column analysis system, the fourth sample loading valve is connected to two ends of the quantitative tube, the carrier gas tube, two ends of the third pre-separation column, and the inlet end of the third chromatographic analytical column, respectively, and the fourth sample loading valve is used to control the connection/disconnection of the connecting tubing between the parts of the fourth chromatographic column analysis system and the connection/disconnection of the connecting tubing between the sample loading assembly and the fourth chromatographic column analysis system; when the fourth sample loading valve is switched to the first setting position, a gas in the sample loading assembly is enabled to be directly discharged from the fourth chromatographic column analysis system after passing through the quantitative tube, a gas in the carrier gas tube of the fourth chromatographic column analysis system is enabled to enter into the outlet end of the third pre-separation column and flow out from the inlet end of the third pre-separation column so as to be discharged from the three analysis systems, and the gas in the carrier gas tube of the fourth chromatographic column analysis system is enabled to enter the third chromatographic analytical column through the inlet end of the third chromatographic analytical column; and when the fourth sample loading valve is switched to the second setting position, the gas in the carrier gas tube of the fourth chromatographic column analysis system is enabled to flow to the third pre-separation column through the quantitative tube of the fourth chromatographic column analysis system, enter into the inlet end of the third pre-separation column and flow out from the outlet end of the third pre-separation column, and then enter the third chromatographic analytical column through the inlet end of the third chromatographic analytical column.

12. The device according to claim 11, wherein the fourth sample loading valve is a ten-way valve having a first setting position and a second setting position, the fourth sample loading valve being provided with a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port, an eighth valve port, a ninth valve port, and a tenth valve port in clockwise sequence; when the fourth sample loading valve is in the first setting position, the tenth valve port is connected to the first valve port, the second valve port is connected to the third valve port, the fourth valve port is connected to the fifth valve port, the sixth valve port is connected to the seventh valve port, and the eighth valve port is connected to the ninth valve port; when the fourth sample loading valve is in the second setting position, the first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, the seventh valve port is connected to the eighth valve port, and the ninth valve port is connected to the tenth valve port; and the tenth valve port and the ninth valve port of the fourth sample loading valve are each connected to the sample loading assembly, the quantitative tube of the fourth chromatographic column analysis system has one end connected to the first valve port of the fourth sample loading valve and the other end connected to the eighth valve port of the fourth sample loading valve, the carrier gas tube of the fourth chromatographic column analysis system is connected to the seventh valve port and the fourth valve port of the fourth sample loading valve, the third pre-separation column has the inlet end connected to the second valve port of the fourth sample loading valve and the outlet end connected to the sixth valve port of the fourth sample loading valve, and the inlet end of the third chromatographic analytical column is connected to the fifth valve port of the fourth sample loading valve.

13. The device according to claim 3, wherein the fifth chromatographic column analysis system comprises a fifth sample loading valve which is a multi-way valve comprising a first setting position and a second setting position; in the fifth chromatographic column analysis system, the fifth sample loading valve is connected to two ends of the quantitative tube, the carrier gas tube, two ends of the fourth pre-separation column, and the inlet end of the fourth chromatographic analytical column, respectively, and the fifth sample loading valve is used to control the connection/disconnection of the connecting tubing between the parts of the fifth chromatographic column analysis system and the connection/disconnection of the connecting tubing between the sample loading assembly and the fifth chromatographic column analysis system; when the fifth sample loading valve is switched to the first setting position, a gas in the sample loading assembly is enabled to be directly discharged from the fifth chromatographic column analysis system after passing through the quantitative tube, a gas in the carrier gas tube of the fifth chromatographic column analysis system is enabled to enter into the outlet end of the fourth pre-separation column and flow out from the inlet end of the fourth pre-separation column so as to be discharged from the three analysis systems, and the gas in the carrier gas tube of the fifth chromatographic column analysis system is enabled to enter the fourth chromatographic analytical column through the inlet end of the fourth chromatographic analytical column; and when the fifth sample loading valve is switched to the second setting position, the gas in the carrier gas tube of the fifth chromatographic column analysis system is enabled to flow to the fourth pre-separation column through the quantitative tube of the fifth chromatographic column analysis system, enter into the inlet end of the fourth pre-separation column and flow out from the outlet end of the fourth pre-separation column, and then enter the fourth chromatographic analytical column through the inlet end of the fourth chromatographic analytical column.

14. The device according to claim 13, wherein the fifth sample loading valve is a ten-way valve having a first setting position and a second setting position, the fifth sample loading valve being provided with a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port, an eighth valve port, a ninth valve port, and a tenth valve port in clockwise sequence; when the fifth sample loading valve is in the first setting position, the tenth valve port is connected to the first valve port, the second valve port is connected to the third valve port, the fourth valve port is connected to the fifth valve port, the sixth valve port is connected to the seventh valve port, and the eighth valve port is connected to the ninth valve port; when the fifth sample loading valve is in the second setting position, the first valve port is connected to the second valve port, the third valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, the seventh valve port is connected to the eighth valve port, and the ninth valve port is connected to the tenth valve port; and the tenth valve port and the ninth valve port of the fifth sample loading valve are each connected to the sample loading assembly, the quantitative tube of the fifth chromatographic column analysis system has one end connected to the first valve port of the fifth sample loading valve and the other end connected to the eighth valve port of the fifth sample loading valve, the carrier gas tube of the fifth chromatographic column analysis system is connected to the seventh valve port and the fourth valve port of the fifth sample loading valve, the fourth pre-separation column has the inlet end connected to the second valve port of the fifth sample loading valve and the outlet end connected to the sixth valve port of the fifth sample loading valve, and the inlet end of the fourth chromatographic analytical column is connected to the fifth valve port of the fifth sample loading valve.

15. A method for analyzing quality indicators of a natural gas product, the method being implemented using a device for analyzing quality indicators of a natural gas product according to any one of claim 1, wherein the method comprises: loading a sample into the quantitative tubes of the first chromatographic column analysis system, the second chromatographic column analysis system, the third chromatographic column analysis system, the fourth chromatographic column analysis system, and the fifth chromatographic column analysis system such that each of the quantitative tubes is filled with a natural gas sample; in the first chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate sulfides from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a first detection chromatogram; determining contents of the sulfides in the natural gas sample based on the obtained first detection chromatogram; in the second chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate hydrocarbons having C.sub.3 and higher from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a second detection chromatogram; determining contents of the hydrocarbons having C.sub.3 and higher in the natural gas sample based on the obtained second detection chromatogram; in the third chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate oxygen, nitrogen, methane, and carbon monoxide from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a third detection chromatogram; determining contents of the oxygen, nitrogen, methane and carbon monoxide in the natural gas sample based on the obtained third detection chromatogram; in the fourth chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate carbon dioxide and ethane from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a fourth detection chromatogram; determining contents of the carbon dioxide and ethane in the natural gas sample based on the obtained fourth detection chromatogram; in the fifth chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate helium and hydrogen from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a fifth detection chromatogram; determining contents of the helium and hydrogen in the natural gas sample based on the obtained fifth detection chromatogram; and based on the obtained contents of the sulfides in the natural gas sample, contents of the hydrocarbons having C.sub.3 and higher in the natural gas sample, contents of the oxygen, nitrogen, methane and carbon monoxide in the natural gas sample, contents of the carbon dioxide and ethane in the natural gas sample, and contents of the helium and hydrogen in the natural gas sample, determining a high calorific value, a total sulfur content, a hydrogen sulfide content, and/or a carbon dioxide content for the natural gas.

16. The method according to claim 15, wherein the step of, in the first chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate sulfides from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a first detection chromatogram comprises: in the first chromatographic column analysis system, using the carrier gas tube to deliver the carrier gas, delivering the natural gas sample in the quantitative tube to the sulfur column under the driving of the carrier gas to separate the sulfides, and delivering the separated components to a sulfur chemiluminescence detector such that the sulfides in the natural gas sample are detected so as to obtain the first detection chromatogram; the sulfur column is maintained at 30-50 C. until carbonyl sulfur exits the sulfur column, and the temperature of the sulfur column is then raised at a rate of 10-20 C./min to, and maintained at, 130 C.

17. The method according to claim 15, wherein the step of, in the second chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate hydrocarbons having C.sub.3 and higher from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a second detection chromatogram comprises: in the second chromatographic column analysis system, using the carrier gas tube to deliver the carrier gas, and subjecting the natural gas sample in the quantitative tube under the driving of the carrier gas to separations using the first pre-separation column and the first chromatographic analytical column in sequence; after C.sub.5.sup. components in the natural gas sample exit the first pre-separation column and enter the first chromatographic analytical column, transferring the carrier gas to the outlet end of the first pre-separation column, connecting the inlet end of the first pre-separation column to the hydrogen flame detector, and under the driving of the carrier gas, back flushing C.sub.6.sup.+ hydrocarbon components from the first pre-separation column to a hydrogen flame detector for detection; and after the back flushing is completed, transferring the carrier gas to the inlet end of the first chromatographic analytical column, and under the driving of the carrier gas, sequentially introducing individual C.sub.3 hydrocarbon components separated by the first chromatographic analytical column into the hydrogen flame detector for detection, so as to obtain the second detection chromatogram; the first chromatographic analytical column is maintained at 30-50 C. until the hydrogen flame detector monitors peaks of the C.sub.6.sup.+ hydrocarbon components, and the temperature of the first chromatographic analytical column is then raised at a rate of 10-20 C./min to, and maintained at, 130 C.

18. The method according to claim 15, wherein the step of, in the third chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate oxygen, nitrogen, methane, and carbon monoxide from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a third detection chromatogram comprises: in the third chromatographic column analysis system, using the carrier gas tube to deliver the carrier gas, and subjecting the natural gas sample in the quantitative tube under the driving of the carrier gas to separations using the second pre-separation column and the second chromatographic analytical column in sequence; after the oxygen, nitrogen, methane and carbon monoxide components in the natural gas sample exit the second pre-separation column and enter the second chromatographic analytical column, transferring the carrier gas to the outlet end of the second pre-separation column, and back flushing the remaining components in the second pre-separation column out of the third chromatographic column analysis system under the driving of the carrier gas; and after the back flushing is completed, transferring the carrier gas to the inlet end of the second chromatographic analytical column, and under the driving force of the carrier gas, sequentially introducing the oxygen, nitrogen, methane and carbon monoxide components separated by the second chromatographic analytical column into the thermal conductivity cell detector for detection, so as to obtain the third detection chromatogram; the column temperature of the second chromatographic analytical column is 50-70 C.

19. The method according to claim 15, wherein the step of, in the fourth chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate carbon dioxide and ethane from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a fourth detection chromatogram comprises: in the fourth chromatographic column analysis system, using the carrier gas tube to deliver the carrier gas, and subjecting the natural gas sample in the quantitative tube under the driving of the carrier gas to separations using the third pre-separation column and the third chromatographic analytical column in sequence; after the carbon dioxide and ethane components in the natural gas sample exit the third pre-separation column and enter the third chromatographic analytical column, transferring the carrier gas to the outlet end of the third pre-separation column, and back flushing the remaining components in the third pre-separation column out of the fourth chromatographic column analysis system under the driving of the carrier gas; and after the back flushing is completed, transferring the carrier gas to the inlet end of the third chromatographic analytical column, and under the driving of the carrier gas, sequentially introducing the carbon dioxide and ethane components separated by the third chromatographic analytical column into the thermal conductivity cell detector for detection, so as to obtain the fourth detection chromatogram; preferably, the column temperature of the third chromatographic analytical column is 50-70 C.

20. The method according to claim 15, wherein the step of, in the fifth chromatographic column analysis system, using the carrier gas tube to deliver a carrier gas, using the chromatographic column to separate helium and hydrogen from the natural gas sample in the quantitative tube under the driving of the carrier gas, and delivering the separated components to a detector for detection to obtain a fifth detection chromatogram comprises: in the fifth chromatographic column analysis system, using the carrier gas tube to deliver the carrier gas, and subjecting the natural gas sample in the quantitative tube under the driving of the carrier gas to separations using the fourth pre-separation column and the fourth chromatographic analytical column in sequence; after the helium and hydrogen components in the natural gas sample exit the fourth pre-separation column and enter the fourth chromatographic analytical column, transferring the carrier gas to the outlet end of the fourth pre-separation column, and back flushing the remaining components in the fourth pre-separation column out of the fifth chromatographic column analysis system under the driving of the carrier gas; and after the back flushing is completed, transferring the carrier gas to the inlet end of the fourth chromatographic analytical column, and under the driving of the carrier gas, sequentially introducing the helium and hydrogen components separated by the fourth chromatographic analytical column into the thermal conductivity cell detector for detection, so as to obtain the fifth detection chromatogram; preferably, the column temperature of the fourth chromatographic analytical column is 50-70 C.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0138] FIG. 1 shows a schematic structural diagram of a device for analyzing quality indicators of a natural gas product in Example 1 of the present invention.

[0139] FIG. 2 shows a schematic structural diagram of a first chromatographic column analysis system in Example 1 of the present invention.

[0140] FIG. 3 shows a schematic structural diagram of a second chromatographic column analysis system in Example 1 of the present invention.

[0141] FIG. 4 shows a schematic structural diagram of a third chromatographic column analysis system in Example 1 of the present invention.

[0142] FIG. 5 shows a schematic structural diagram of a fourth chromatographic column analysis system in Example 1 of the present invention.

[0143] FIG. 6 shows a schematic structural diagram of a fifth chromatographic column analysis system in Example 1 of the present invention.

[0144] FIG. 7 shows a first detection chromatogram in Example 2 of the present invention.

[0145] FIG. 8 shows a second detection chromatogram in Example 2 of the present invention.

[0146] FIG. 9 shows third and fourth detection chromatograms in Example 2 of the present invention.

[0147] FIG. 10 shows a fifth detection chromatogram in Example 2 of the present invention.

[0148] FIG. 11 shows a standard curve of hydrogen sulfide content.

[0149] FIG. 12 shows a standard curve of carbon oxysulfide content.

[0150] FIG. 13 shows a standard curve of methyl mercaptan content.

[0151] FIG. 14 shows a standard curve of ethyl mercaptan content.

[0152] FIG. 15 shows a standard curve of methyl sulfide content.

[0153] FIG. 16 shows a standard curve of carbon disulfide content.

[0154] FIG. 17 shows a standard curve of isopropyl mercaptan content.

[0155] FIG. 18 shows a standard curve of tert-butyl mercaptan content.

[0156] FIG. 19 shows a standard curve of methyl ethyl sulfide content.

[0157] FIG. 20 shows a standard curve of thiophene content.

[0158] FIG. 21 shows a standard curve of ethyl sulfide content.

[0159] FIG. 22 shows a standard curve of n-butyl mercaptan content.

[0160] FIG. 23 shows a standard curve of dimethyl disulfide content.

[0161] FIG. 24 shows a standard curve of carbon dioxide content.

[0162] FIG. 25 shows a standard curve of ethane content.

[0163] FIG. 26 shows a standard curve of nitrogen content.

[0164] FIG. 27 shows a standard curve of helium content.

[0165] FIG. 28 shows a standard curve of hydrogen content.

[0166] FIG. 29 shows a standard curve of hexane content.

[0167] FIG. 30 shows a standard curve of propane content.

[0168] FIG. 31 shows a standard curve of carbon monoxide content.

[0169] FIG. 32 shows a standard curve of isobutane content.

[0170] FIG. 33 shows a standard curve of n-butane content.

[0171] FIG. 34 shows a standard curve of neopentane content.

[0172] FIG. 35 shows a standard curve of isopentane content.

[0173] FIG. 36 shows a standard curve of n-pentane content.

Description of Main Reference Signs

[0174] 1 sample loading assembly; 11 natural gas intake tube; 12 natural gas discharge tube; 13 first quantitative tube connecting tube; 14 second quantitative tube connecting tube; 15 third quantitative tube connecting tube; 16 fourth quantitative tube connecting tube; [0175] 21 first chromatographic column analysis system; 211 first sample loading valve; 212 first quantitative tube; 213 first carrier gas tube; 214 sulfur column; 215 split/splitless inlet; [0176] 22 second chromatographic column analysis system; 221 second sample loading valve; 222 second quantitative tube; 223 second carrier gas tube; 224 first pre-separation column; 225 first chromatographic analytical column; [0177] 23 third chromatographic column analysis system; 231 third sample loading valve; 232 third quantitative tube; 233 third carrier gas tube; 234 second pre-separation column; 235 second chromatographic analytical column; [0178] 24 fourth chromatographic column analysis system; 241 fourth sample loading valve; 242 fourth quantitative tube; 243 fourth carrier gas tube; 244 third pre-separation column; 245 third chromatographic analytical column; [0179] 25 fifth chromatographic column analysis system; 251 fifth sample loading valve; 252 fifth quantitative tube; 253 fifth carrier gas tube; 254 fourth pre-separation column; 255 fourth chromatographic analytical column; [0180] 31 sulfur chemiluminescence detector; 32 flame ionization detector; 33 first thermal conductivity detector; 34 second thermal conductivity detector.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0181] In order to make the objects, technical solutions and advantages of embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. Apparently, the described examples are some rather than all of the examples of the present invention. Any other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the scope of protection of the present invention. The principles and spirits of the present invention will be described in detail below with reference to several representative embodiments.

Example 1

[0182] As shown in FIGS. 1 to 6, this example provides a device for analyzing quality indicators of a natural gas product. The system comprises: a sample loading assembly 1, a first chromatographic column analysis system 21, a second chromatographic column analysis system 22, a third chromatographic column analysis system 23, a fourth chromatographic column analysis system 24, a fifth chromatographic column analysis system 25, a sulfur chemiluminescence detector 31, a flame ionization detector 32, a first thermal conductivity detector 33, and a second thermal conductivity detector 34.

[0183] The sample loading assembly 1 comprises a natural gas intake tube 11, a natural gas discharge tube 12, a first quantitative tube connecting tube 13, a second quantitative tube connecting tube 14, a third quantitative tube connecting tube 15, and a fourth quantitative tube connecting tube 16.

[0184] Each chromatographic column analysis system comprises a sample loading valve, and a quantitative tube, a carrier gas tube and a chromatographic column that are connected to the sample loading valve. Specifically, the first chromatographic column analysis system 21 comprises a first sample loading valve 211, a first quantitative tube 212, a first carrier gas tube 213, a sulfur column 214, and a split/splitless inlet 215. The first sample loading valve 211 is a six-way valve having a first setting position and a second setting position, and is provided with a first valve port a1, a second valve port a2, a third valve port a3, a fourth valve port a4, a fifth valve port a5, and a sixth valve port a6 in clockwise sequence; when the first sample loading valve 211 is in the first setting position, the sixth valve port a6 is connected to the first valve port a1, the second valve port a2 is connected to the third valve port a3, and the fourth valve port a4 is connected to the fifth valve port a5; when the first sample loading valve 211 is in the second setting position, the first valve port a1 is connected to the second valve port a2, the third valve port a3 is connected to the fourth valve port a4, and the fifth valve port a5 is connected to the sixth valve port a6; the first quantitative tube 212 has one end connected to the first valve port a1 and the other end connected to the fourth valve port a4, the first carrier gas tube 213 is connected to the second valve port a2, and the sulfur column 214 is connected to the third valve port a3; and the split/splitless inlet 215 is disposed in a connecting tubing between the sulfur column 214 and the third valve port a3. The sulfur column 214 enables separation of carbon oxysulfide, hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, methyl ethyl sulfide, dimethyl disulfide, ethyl sulfide, carbon disulfide, n-butyl mercaptan, tert-butyl mercaptan, isopropyl mercaptan, and thiophene. The first carrier gas tube 213 is provided with a flow control meter 2131.

[0185] The second chromatographic column analysis system 22 comprises a second sample loading valve 221, a second quantitative tube 222, a second carrier gas tube 223, a first pre-separation column 224, and a first chromatographic analytical column 225. The second sample loading valve 222 is a ten-way valve having a first setting position and a second setting position, and is provided with a first valve port b1, a second valve port b2, a third valve port b3, a fourth valve port b4, a fifth valve port b5, a sixth valve port b6, a seventh valve port b7, an eighth valve port b8, a ninth valve port b9 and a tenth valve port b10 in clockwise sequence; when the second sample loading valve 221 is in the first setting position, the tenth valve port b10 is connected to the first valve port b1, the second valve port b2 is connected to the third valve port b3, the fourth valve port b4 is connected to the fifth valve port b5, the sixth valve port b6 is connected to the seventh valve port b7, and the eighth valve port b8 is connected to the ninth valve port b9; when the second sample loading valve 221 is in the second setting position, the first valve port b1 is connected to the second valve port b2, the third valve port b3 is connected to the fourth valve port b4, the fifth valve port b5 is connected to the sixth valve port b6, the seventh valve port b7 is connected to the eighth valve port b8, and the ninth valve port b9 is connected to the tenth valve port b10; and the second quantitative tube 222 has one end connected to the first valve port b1 and the other end connected to the eighth valve port b8, the second carrier gas tube 223 is connected to each of the seventh valve port b7 and the fourth valve port b4, the first pre-separation column 224 has an inlet end connected to the second valve port b2 and an outlet end connected to the sixth valve port b6, and an inlet end of the first chromatographic analytical column 225 is connected to the fifth valve port b5. The first pre-separation column 224 enables separation of C.sub.6.sup.+ hydrocarbon components (including hydrocarbon components having 6 or more carbons) from C.sub.5.sup. hydrocarbon components (including hydrocarbon components having 5 or less carbons); and the first chromatographic analytical column 225 enables separation of propane, isobutane, n-butane, neopentane, isopentane, n-pentane. The second carrier gas tube 223 is provided with a flow control meter 2231; a damping tube 227 is disposed in a connecting tubing between the second carrier gas tube 223 and the fourth valve port b4; and a diverter valve 229 is disposed in a connecting tubing between the inlet end of the first chromatographic analytical column 225 and the fifth valve port b5.

[0186] The third chromatographic column analysis system 23 comprises a third sample loading valve 231, a third quantitative tube 232, a third carrier gas tube 233, a second pre-separation column 234, and a second chromatographic analytical column 235. The third sample loading valve 231 is a ten-way valve having a first setting position and a second setting position, and is provided with a first valve port c1, a second valve port c2, a third valve port c3, a fourth valve port c4, a fifth valve port c5, a sixth valve port c6, a seventh valve port c7, an eighth valve port c8, a ninth valve port c9 and a tenth valve port c10 in clockwise sequence; when the third sample loading valve 231 is in the first setting position, the tenth valve port c10 is connected to the first valve port c1, the second valve port c2 is connected to the third valve port c3, the fourth valve port c4 is connected to the fifth valve port c5, the sixth valve port c6 is connected to the seventh valve port c7, and the eighth valve port c8 is connected to the ninth valve port c9; when the third sample loading valve 231 is in the second setting position, the first valve port c1 is connected to the second valve port c2, the third valve port c3 is connected to the fourth valve port c4, the fifth valve port c5 is connected to the sixth valve port c6, the seventh valve port c7 is connected to the eighth valve port c8, and the ninth valve port c9 is connected to the tenth valve port c10; the third quantitative tube 232 has one end connected to the first valve port c1 and the other end connected to the eighth valve port c8, the third carrier gas tube 233 is connected to each of the seventh valve port c7 and the fourth valve port c4, the second pre-separation column 234 has an inlet end connected to the second valve port c2 and an outlet end connected to the sixth valve port c6, and an inlet end of the second chromatographic analytical column 235 is connected to the fifth valve port c5; and the third valve port c3 is used as a back-flushing exhaust port of the second pre-separation column 234. The second pre-separation column 234 enables separation of oxygen, nitrogen, methane and carbon monoxide from the natural gas (other hydrocarbon components in the natural gas can be back flushed out), and the second chromatographic analytical column 235 enables separation of oxygen, nitrogen, methane and carbon monoxide; the third carrier gas tube 233 is provided with a flow control meter 2331, and a damping tube 237 is disposed on a connecting tubing between the third carrier gas tube 233 and the fourth valve port c4; and a damping tube 236 is disposed on an external exhaust tubing connected to the third valve port c3.

[0187] The fourth chromatographic column analysis system 24 comprises a fourth sample loading valve 241, a fourth quantitative tube 242, a fourth carrier gas tube 243, a third pre-separation column 244, and a third chromatographic analytical column 245. The fourth sample loading valve 241 is a ten-way valve having a first setting position and a second setting position, and is provided with a first valve port d1, a second valve port d2, a third valve port d3, a fourth valve port d4, a fifth valve port d5, a sixth valve port d6, a seventh valve port d7, an eighth valve port d8, a ninth valve port d9, and a tenth valve port d10 in clockwise sequence; when the fourth sample loading valve 241 is in the first setting position, the tenth valve port d10 is connected to the first valve port d1, the second valve port d2 is connected to the third valve port d3, the fourth valve port d4 is connected to the fifth valve port d5, the sixth valve port d6 is connected to the seventh valve port d7, and the eighth valve port d8 is connected to the ninth valve port d9; when the fourth sample loading valve 241 is in the second setting position, the first valve port d1 is connected to the second valve port d2, the third valve port d3 is connected to the fourth valve port d4, the fifth valve port d5 is connected to the sixth valve port d6, the seventh valve port d7 is connected to the eighth valve port d8, and the ninth valve port d9 is connected to the tenth valve port d10; the fourth quantitative tube 242 has one end connected to the first valve port d1 and the other end connected to the eighth valve port d8, the fourth carrier gas tube 243 is connected to each of the seventh valve port d7 and the fourth valve port d4, the third pre-separation column 244 has an inlet end connected to the second valve port d2 and an outlet end connected to the sixth valve port d6, and an inlet end of the third chromatographic analytical column 245 is connected to the fifth valve port d5; and the third valve port d3 is used as a back-flushing exhaust port of the third pre-separation column 244. The third pre-separation column 244 enables separation of ethane and CO.sub.2 from the natural gas, and the third chromatographic analytical column 245 enables separation of ethane and CO.sub.2; the fourth carrier gas tube 243 is provided with a flow control meter 2431; a damping tube 247 is disposed on a connecting tubing between the fourth carrier gas tube 243 and the fourth valve port d4; and a damping tube 246 is disposed on an external exhaust tubing connected to the third valve port d3.

[0188] The fifth chromatographic column analysis system 25 comprises a fifth sample loading valve 251, a fifth quantitative tube 252, a fifth carrier gas tube 253, a fourth pre-separation column 254, and a fourth chromatographic analytical column 255. The fifth sample loading valve 251 is a ten-way valve having a first setting position and a second setting position, and is provided with a first valve port e1, a second valve port e2, a third valve port e3, a fourth valve port e4, a fifth valve port e5, a sixth valve port e6, a seventh valve port e7, an eighth valve port e8, a ninth valve port e9 and a tenth valve port e10 in clockwise sequence; when the fifth sample loading valve 251 is in the first setting position, the tenth valve port e10 is connected to the first valve port e1, the second valve port e2 is connected to the third valve port e3, the fourth valve port e4 is connected to the fifth valve port e5, the sixth valve port e6 is connected to the seventh valve port e7, and the eighth valve port e8 is connected to the ninth valve port e9; when the fifth sample loading valve 251 is in the second setting position, the first valve port e1 is connected to the second valve port e2, the third valve port e3 is connected to the fourth valve port e4, the fifth valve port e5 is connected to the sixth valve port e6, the seventh valve port e7 is connected to the eighth valve port e8, and the ninth valve port e9 is connected to the tenth valve port e10; the fifth quantitative tube 252 has one end connected to the first valve port e1 and the other end connected to the eighth valve port e8, the fifth carrier gas tube 253 is connected to each of the seventh valve port e7 and the fourth valve port e4, the fourth pre-separation column 254 has an inlet end connected to the second valve port e2 and an outlet end connected to the sixth valve port e6, and an inlet end of the fourth chromatographic analytical column 255 is connected to the fifth valve port e5; and the third valve port e3 is used as a back-flushing exhaust port of the fourth pre-separation column 254. The fourth pre-separation column 254 enables separation of helium and hydrogen from the natural gas (other hydrocarbon components in the natural gas can be back flushed out), and the fourth chromatographic analytical column 255 enables separation of helium and hydrogen; the fifth carrier gas tube 253 is provided with a flow control meter 2531; a damping tube 257 is disposed on a connecting tubing between the fifth carrier gas tube 253 and the fourth valve port e4; and a damping tube 256 is disposed on an external exhaust tubing connected to the third valve port e3. The first sample loading valve 211, the second sample loading valve 221, the third sample loading valve 231, the fourth sample loading valve 241, and the fifth sample loading valve 251 are connected in series via the first quantitative tube connection tube 13, the second quantitative tube connection tube 14, the third quantitative tube connection tube 15, and the fourth quantitative tube connection tube 16, and the natural gas intake tube 11 and the natural gas discharge tube 12 are connected to the first and last sample loading valves of the first sample loading valve 211, the second sample loading valve 221, the third sample loading valve 231, the fourth sample loading valve 241, and the fifth sample loading valve 251 that are connected in series, thereby connecting the quantitative tubes in series. Specifically, the sixth valve port a6 of the first sample loading valve 211 is connected to the natural gas intake tube 11, the fifth valve port a5 of the first sample loading valve 211 is connected to the first quantitative tube connecting tube 13, the tenth valve port b10 of the second sample loading valve 221 is connected to the first quantitative tube connecting tube 13, the ninth valve port b9 of the second sample loading valve 221 is connected to the second quantitative tube connecting tube 14, the tenth valve port c10 of the third sample loading valve 231 is connected to the second quantitative tube connection tube 14, the ninth valve port c9 of the third sample loading valve 231 is connected to the third quantitative tube connection tube 15, the tenth valve port d10 of the fourth sample loading valve 241 is connected to the third quantitative tube connection tube 15, the ninth valve port d9 of the fourth sample loading valve 241 is connected to the fourth quantitative tube connection tube 16, the tenth valve port e10 of the fifth sample loading valve 251 is connected to the fourth quantitative tube connection tube 16, and the ninth valve port e9 of the fifth sample loading valve 251 is connected to the natural gas discharge tube 12. The natural gas intake tube 11 is provided with a control valve 111; the second quantitative tube connecting tube 14 is provided with a control valve 141; the third quantitative tube connection tube 15 is provided with a control valve 151; and the chromatographic column analysis systems are connected to corresponding detectors, respectively. Specifically, the sulfur chemiluminescence detector 31 is connected to an outlet end of the sulfur column 214, the third valve port b3 of the second sample loading valve 221 and the first chromatographic analytical column 225 are each connected to the flame ionization detector 32, the second chromatographic analytical column 235 is connected to the first thermal conductivity detector 33, the third chromatographic analytical column 245 is connected to the first thermal conductivity detector 33, and the fourth chromatographic analytical column 255 and the fifth carrier gas tube 253 are each connected to the second thermal conductivity detector 34. A diverter valve 228 and a damping tube 226 are disposed in a connecting tubing between the third valve port b3 of the second sample loading valve 221 and the flame ionization detector 32; and a damping tube 258 is disposed in a connecting tubing between the fifth carrier gas tube 253 and the second thermal conductivity detector 34.

[0189] The first chromatographic column analysis system 21 is configured for separating carbon oxysulfide, hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, methyl ethyl sulfide, dimethyl disulfide, ethyl sulfide, carbon disulfide, n-butyl mercaptan, tert-butyl mercaptan, isopropyl mercaptan, and thiophene from the natural gas, and the first chromatographic column analysis system 21 is connected to the sulfur chemiluminescence detector 31 to analyze contents of the carbon oxysulfide, hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, methyl ethyl sulfide, dimethyl disulfide, ethyl sulfide, carbon disulfide, n-butyl mercaptan, tert-butyl mercaptan, isopropyl mercaptan, and thiophene in the natural gas.

[0190] The second chromatographic column analysis system 22 is configured for separating the hydrocarbons having C.sub.3 and higher from the natural gas, and the second chromatographic column analysis system 22 is connected to the flame ionization detector 32 to analyze contents of the hydrocarbons having C.sub.3 and higher in the natural gas.

[0191] The third chromatographic column analysis system 23 is configured for separating oxygen, nitrogen, methane and carbon monoxide from the natural gas, and the third chromatographic column analysis system 23 is connected to the first thermal conductivity detector 33 to analyze contents of the oxygen, nitrogen, methane and carbon monoxide in the natural gas.

[0192] The fourth chromatographic column analysis system 24 is configured for separating carbon dioxide and ethane from the natural gas, and the fourth chromatographic column analysis system 24 is connected to the first thermal conductivity detector 33 to analyze contents of the carbon dioxide and ethane in the natural gas.

[0193] The fifth chromatographic column analysis system 25 is configured for separating helium and hydrogen from the natural gas, and the fifth chromatographic column analysis system 25 is connected to the second thermal conductivity detector 34 to analyze contents of the helium and hydrogen content in the natural gas.

[0194] Specifically, the sulfur column 214 is a DB-Sulfur SCD chromatographic column. The sulfur column 214 has dimensions of 60 m in length and 0.32 mm in diameter, with a capillary column liquid film thickness of 4.2 m.

[0195] The volume of the first quantitative tube 212 is 1 mL.

[0196] Specifically, the first pre-separation column 224 is an OV-1 pre-separation column; a packing material of the first pre-separation column 224 comprises 80-100 mesh Celite 545 and silicone OV-1, where the content of silicone OV-1 is 10% based on the mass of Celite 545 (Silicone OV-1 10% Celite 545 80/100 mesh); and the first pre-separation column 224 has dimensions of 1.6 mm in outer diameter, 1.0 mm in inner diameter, and 1.0 m in length.

[0197] The first chromatographic analytical column 225 is an HP-Al/S chromatographic column. The first chromatographic analytical column 225 has dimensions of 50 m in length and 0.53 mm in diameter, with a liquid film thickness of 15 m.

[0198] The volume of the second quantitative tube 222 is 0.1 mL.

[0199] Specifically, the second pre-separation column 234 is a Porapak N column; a packing material of the second pre-separation column 234 has a mesh number of 80-100; and the second pre-separation column 234 has dimensions of 3.2 mm in outer diameter, 2.1 mm in inner diameter, and 1.0 m in length.

[0200] The second chromatographic analytical column 235 is an MS-13X molecular sieve column. The second chromatographic analytical column 235 has dimensions of 3.2 mm in outer diameter, 2.1 mm in inner diameter, and 5.0 m in length.

[0201] The volume of the third quantitative tube 232 is 1 mL.

[0202] Specifically, the third pre-separation column 244 is a Porapak N column; a packing material of the third pre-separation column 244 has a mesh number of 80-100; and the third pre-separation column 244 has dimensions of 3.2 mm in outer diameter, 2.1 mm in inner diameter, and 1.0 m in length.

[0203] The third chromatographic analytical column 245 is a Porapak N column; a packing material of the third chromatographic analytical column 245 has a mesh number of 80-100; and the third chromatographic analytical column 245 has dimensions of 3.2 mm in outer diameter, 2.1 mm in inner diameter, and 2.0 m in length.

[0204] The volume of the fourth quantitative tube 242 is 1 mL.

[0205] Specifically, the fourth pre-separation column 254 is a Porapak N column; a packing material of the fourth pre-separation column 254 has a mesh number of 80-100; and the fourth pre-separation column 254 has dimensions of 3.2 mm in outer diameter, 2.1 mm in inner diameter, and 1.0 m in length.

[0206] The fourth chromatographic analytical column 255 is an MS-5A molecular sieve column, and a packing material of the fourth chromatographic analytical column 255 has a mesh number of 60-80. The fourth chromatographic analytical column 255 has dimensions of 3.2 mm in outer diameter, 2.1 mm in inner diameter, and 3.0 m in length.

[0207] The volume of the fifth quantitative tube 252 is 5 mL.

[0208] Specifically, the device further comprises a programmed temperature ramp apparatus in which the sulfur column 214 and the first chromatographic analytical column 225 are disposed.

[0209] Specifically, the device further comprises a thermostat in which the second chromatographic analytical column 235, the third chromatographic analytical column 245, and the fourth chromatographic analytical column 255 are disposed.

Example 2

[0210] Further provided in this example is a method for analyzing quality indicators of a natural gas product. The method is implemented using the device for analyzing quality indicators of a natural gas product according to Example 1. The method comprises the following steps.

[0211] In step S1, a sample is injected into the quantitative tubes of the first chromatographic column analysis system 21, the second chromatographic column analysis system 22, the third chromatographic column analysis system 23, the fourth chromatographic column analysis system 24, and the fifth chromatographic column analysis system 25 such that each of the quantitative tubes is filled with a natural gas sample. Specifically, the first sample loading valve 211, the second sample loading valve 221, the third sample loading valve 231, the fourth sample loading valve 241 and the fifth sample loading valve 251 are each switched to the first setting position, a natural gas product is introduced from the natural gas intake tube 11 to the first sample loading valve 211, and the natural gas product passes through the first quantitative tube 212, the second quantitative tube 232, the third quantitative tube 232, the fourth quantitative tube 242 and the fifth quantitative tube 252 in sequence, and is then discharged from the natural gas discharge tube 12; and the first quantitative tube 212, the second quantitative tube 232, the third quantitative tube 232, the fourth quantitative tube 242, and the fifth quantitative tube 252 entrap part of the natural gas product as a natural gas sample.

[0212] In step S2, in the first chromatographic column analysis system 21, the first carrier gas tube 213 is used to deliver the carrier gas, the natural gas sample in the first quantitative tube 212 is delivered to the sulfur column 214 under the driving of the carrier gas to separate the sulfides, and the separated components are delivered to a sulfur chemiluminescence detector 31 such that the sulfides in the natural gas sample are detected so as to obtain a first detection chromatogram. Specifically, the first sample loading valve 211 in the first chromatographic column analysis system 21 is switched to the second setting position, a carrier gas is introduced into the first chromatographic column analysis system 21 from the first carrier gas tube 213 at a flow rate of 3 mL/min, enters the first quantitative tube 212 through the second valve port a2 and the first valve port a1 in sequence, and drives the natural gas sample in the first quantitative tube 212 to flow into the sulfur column 214 after passing through the fourth valve port a4, the third valve port a3 and the split/splitless inlet 215 in sequence, so as to be separated in the sulfur column 214; and carbon oxysulfide, hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, methyl ethyl sulfide, dimethyl disulfide, ethyl sulfide, carbon disulfide, n-butyl mercaptan, tert-butyl mercaptan, isopropyl mercaptan, and thiophene are sequentially discharged from the sulfur column 214 into the sulfur chemiluminescence detector 31 for detection, so as to obtain the first detection chromatogram. See FIG. 7 for the first detection chromatogram.

[0213] The carrier gas is helium.

[0214] The sulfur column 214 is maintained (for 3 min in this example) at 40 C. until carbonyl sulfur exits the sulfur column, and the sulfur column is then heated at a rate of 15 C./min to, and maintained (for 6 min in this example) at, 130 C. until the first detection chromatogram is obtained.

[0215] The sulfur chemiluminescence detector 31 has a sample loading temperature of 200 C. and a reaction temperature of 850 C., the sulfur chemiluminescence detector 31 has a split ratio of 10:1, and flow rates of reaction gases in the sulfur chemiluminescence detector 31 are 80 mL/min of hydrogen (H.sub.2), 40 mL/min of nitrogen (N.sub.2), 10 mL/min of oxygen (O.sub.2), and 25 mL/min of ozone (O.sub.3).

[0216] In step S3, in the second chromatographic column analysis system 22, the second carrier gas tube 223 is used to deliver the carrier gas, and the first pre-separation column 224 and the first chromatographic analytical column 225 are used in sequence to perform separation on the natural gas sample in the second quantitative tube 222 under the driving of the carrier gas; when C.sub.5.sup. components in the natural gas sample exit the first pre-separation column 224 and enter the first chromatographic analytical column 225, the carrier gas is transferred to the outlet end of the first pre-separation column 224, the inlet end of the first pre-separation column 225 is connected to the flame ionization detector 32, and under the driving of the carrier gas, C.sub.6.sup.+ hydrocarbon components in the first pre-separation column 224 are back flushed to the flame ionization detector 32 for detection; after the back flushing is completed, the carrier gas is transferred to the inlet end of the first chromatographic analytical column 224, and under the driving of the carrier gas, C.sub.3.sup. hydrocarbon components separated by the first chromatographic analytical column 225 sequentially enter the flame ionization detector 32 for detection, so as to obtain the second detection chromatogram. Specifically, the second sample loading valve 221 in the second chromatographic column analysis system 22 is switched to the second setting position, the carrier gas is introduced into the second chromatographic column analysis system 22 from the second carrier gas tube 223 at a pressure of 500 kPa, enters the second quantitative tube 222 through the seventh valve port b7 and the eighth valve port b8 in sequence, and drives the natural gas sample in the second quantitative tube 222 to flow into the first pre-separation column 224 after passing through the first valve port b1 and the second valve port b2 in sequence, so as to be pre-separated in the first pre-separation column 224; and propane, isobutane, n-butane, neopentane, isopentane, and n-pentane are sequentially discharged from the first pre-separation column 224, and then enter the first chromatographic analytical column 225 for further separation after passing through the sixth valve port b6 and the fifth valve port b5 in sequence under the driving of the carrier gas, so that the time difference in separation of the components is increased. After the C.sub.5.sup. components exit the first pre-separation column 224 and enter the first chromatographic analytical column 225, the second sample loading valve 221 of the second chromatographic column analysis system 22 is switched to the first setting position. The carrier gas is introduced from the second carrier gas tube 223 at a pressure of 500 kPa, and enters the first pre-separation column 224 from the outlet end of the first pre-separation column 224 through the seventh valve port b7 and the sixth valve port b6 in sequence, and the C.sub.6.sup.+ hydrocarbon components in the first pre-separation column 224 are flushed out of the first pre-separation column 224, and enter the flame ionization detector 32 through the second valve port b2 and the third valve port b3 for detection. After the flame ionization detector 32 monitors a hexane combined peak, a flow direction of the carrier gas is adjusted. The carrier gas is introduced from the second carrier gas tube 223 at a pressure of 500 kPa, and enters the first chromatographic analytical column 225 after passing through the fourth valve port b4 and the fifth valve port b5 in sequence. Under the driving of the carrier gas, the propane, isobutane, n-butane, neopentane, isopentane, and n-pentane sequentially exit the first chromatographic analytical column 225 and enter the flame ionization detector 32 for detection so as to obtain the second detection chromatogram. See FIG. 8 for the second detection chromatogram.

[0217] The carrier gas is helium.

[0218] The first chromatographic analytical column 225 is maintained (for 3 min in this example) at 40 C. until the hexane combined peak is monitored, and the first chromatographic analytical column is then heated at a rate of 15 C./min to, and maintained (for 6 min in this example) at, 130 C. until the second detection chromatogram is obtained.

[0219] The temperature of the flame ionization detector 32 is 200 C., and flow rates of reaction gases of the flame ionization detector 32 are 32 mL/min of hydrogen (H.sub.2), 200 mL/min of air, and 20 mL/min of make-up gas (Make-up).

[0220] In step S4, in the third chromatographic column analysis system 23, the third carrier gas tube 233 is used to deliver the carrier gas, and the second pre-separation column 234 and the second chromatographic analytical column 235 are used to perform separation on the natural gas sample in the third quantitative tube 232 under the driving of the carrier gas; after the oxygen, nitrogen, methane and carbon monoxide components in the natural gas sample exit the second pre-separation column 234 and enter the second chromatographic analytical column 235, transferring the carrier gas to the outlet end of the second pre-separation column 234, and the remaining components in the second pre-separation column 235 are back flushed out of the third chromatographic column analysis system 23 under the driving of the carrier gas; and after the back flushing is completed, the carrier gas is transferred to the inlet end of the second chromatographic analytical column 235, and under the driving force of the carrier gas, the oxygen, nitrogen, methane and carbon monoxide components separated by the second chromatographic analytical column 235 sequentially enter the first thermal conductivity detector 33 for detection, so as to obtain the third detection chromatogram. Specifically, the third sample loading valve 231 in the third chromatographic column analysis system 23 is switched to the second setting position, the carrier gas is introduced into the third chromatographic column analysis system 23 from the third carrier gas tube 233 at a pressure of 500 kPa, enters the third quantitative tube 232 through the seventh valve port c7 and the eighth valve port c8 in sequence, and drives the natural gas sample in the third quantitative tube 232 to flow into the second pre-separation column 234 after passing through the first valve port c1 and the second valve port c2 in sequence, so as to be pre-separated in the second pre-separation column 234; and oxygen, nitrogen, methane and carbon monoxide are sequentially discharged from the second pre-separation column 234, and then enter the second chromatographic analytical column 235 for further separation after passing through the sixth valve port c6 and the fifth valve port c5 in sequence under the driving of the carrier gas, so that the time difference in separation of the components is increased. After the oxygen, nitrogen, methane and carbon monoxide components exit the second pre-separation column 234 and enter the second chromatographic analytical column 235, the third sample loading valve 231 of the third chromatographic column analysis system 23 is switched to the first setting position. The carrier gas is introduced from the third carrier gas tube 233 at a pressure of 500 kPa, and enters the second pre-separation column 234 from the outlet end of the second pre-separation column 234 through the seventh valve port c7 and the sixth valve port c6 in sequence, and the remaining components in the second pre-separation column 234 are flushed out of the third chromatographic column analysis system 23. A flow direction of the carrier gas is then adjusted. The carrier gas is introduced from the third carrier gas tube 233 at a pressure of 500 kPa, and enters the second chromatographic analytical column 235 after passing through the fourth valve port c4 and the fifth valve port c5 in sequence, and the oxygen, nitrogen, methane and carbon monoxide sequentially exit the second chromatographic analytical column 235 under the driving of the carrier gas and enter the first thermal conductivity detector 33 for detection so as to obtain the third detection chromatogram. See FIG. 9 for the third detection chromatogram (the third detection chromatogram and the fourth detection chromatogram being combined into one detection chromatogram).

[0221] The carrier gas is helium.

[0222] The column temperature of the second chromatographic analytical column is 60 C.

[0223] The temperature of the first thermal conductivity detector 33 is 150 C., and the first thermal conductivity detector 33 has an operating current of 120 mA, and is cathodic in polarity.

[0224] In step S5, in the fourth chromatographic column analysis system 24, the fourth carrier gas tube 243 is used to deliver the carrier gas, and the third pre-separation column 244 and the third chromatographic analytical column 245 are used to perform separation on the natural gas sample in the fourth quantitative tube 242 under the driving of the carrier gas; after carbon dioxide and ethane components in the natural gas sample exit the third pre-separation column 244 and enter the third chromatographic analytical column 245, the carrier gas is transferred to the outlet end of the third pre-separation column 244, and the remaining components in the third pre-separation column 245 are back flushed out of the fourth chromatographic column analysis system 24 under the driving of the carrier gas; and after the back flushing is completed, the carrier gas is transferred to the inlet end of the third chromatographic analytical column 245, and under the driving of the carrier gas, the carbon dioxide and ethane components separated by the third chromatographic analytical column 245 sequentially enter the first thermal conductivity detector 33 for detection, so as to obtain a fourth detection chromatogram. Specifically, the fourth sample loading valve 241 in the fourth chromatographic column analysis system 24 is switched to the second setting position, the carrier gas is introduced into the fourth chromatographic column analysis system 24 from the fourth carrier gas tube 243 at a pressure of 350 kPa, enters the fourth quantitative tube 242 through the seventh valve port d7 and the eighth valve port d8 in sequence, and drives the natural gas sample in the fourth quantitative tube 242 to flow into the third pre-separation column 244 after passing through the first valve port d1 and the second valve port d2 in sequence, so as to be pre-separated in the third pre-separation column 244; and carbon dioxide and ethane are sequentially discharged from the third pre-separation column 244, and then enter the third chromatographic analytical column 245 for further separation after passing through the sixth valve port d6 and the fifth valve port d5 in sequence under the driving of the carrier gas, so that the time difference in separation of the components is increased. After the carbon dioxide and ethane components exit the third pre-separation column 244 and enter the third chromatographic analytical column 245, the fourth sample loading valve 241 of the third chromatographic column analysis system 23 is switched to the first setting position. The carrier gas is introduced from the fourth carrier gas tube 243 at a pressure of 350 kPa, and enters the third pre-separation column 244 from the outlet end of the third pre-separation column 244 through the seventh valve port d7 and the sixth valve port d6 in sequence, and the remaining components in the third pre-separation column 244 are flushed out of the third chromatographic column analysis system 23. A flow direction of the carrier gas is then adjusted. The carrier gas is introduced from the fourth carrier gas tube 243 at a pressure of 350 kPa, and enters the third chromatographic analytical column 245 after passing through the fourth valve port d4 and the fifth valve port d5 in sequence, and the carbon dioxide and ethane sequentially exit the third chromatographic analytical column 245 under the driving of the carrier gas and enter the first thermal conductivity detector 33 for detection so as to obtain the fourth detection chromatogram. See FIG. 9 for the fourth detection chromatogram (the third detection chromatogram and the fourth detection chromatogram being combined into one detection chromatogram)

[0225] The carrier gas is helium.

[0226] The column temperature of the second chromatographic analytical column is 60 C.

[0227] The temperature of the first thermal conductivity detector 33 is 150 C., and the first thermal conductivity detector 33 has an operating current of 120 mA, and is cathodic in polarity.

[0228] In step S6, in the fifth chromatographic column analysis system 25, the fifth carrier gas tube 253 is used to deliver the carrier gas, and the fourth pre-separation column 254 and the fourth chromatographic analytical column 255 are used to perform separation on the natural gas sample in the fifth quantitative tube 252 under the driving of the carrier gas; after carbon dioxide and ethane components in the natural gas sample exit the fourth pre-separation column 254 and enter the fourth chromatographic analytical column 255, the carrier gas is transferred to the outlet end of the fourth pre-separation column 254, and the remaining components in the third pre-separation column 245 are back flushed out of the fifth chromatographic column analysis system 25 under the driving of the carrier gas; and after the back flushing is completed, the carrier gas is transferred to the inlet end of the fourth chromatographic analytical column 255, and under the driving of the carrier gas, the carbon dioxide and ethane components separated by the fourth chromatographic analytical column 255 sequentially enter the second thermal conductivity detector 34 for detection, so as to obtain a fifth detection chromatogram. Specifically, the fifth sample loading valve 251 in the fifth chromatographic column analysis system 25 is switched to the second setting position, the carrier gas is introduced into the fifth chromatographic column analysis system 25 from the fifth carrier gas tube 253 at a pressure of 250 kPa, enters the fifth quantitative tube 252 through the seventh valve port e7 and the eighth valve port e8 in sequence, and drives the natural gas sample in the fifth quantitative tube 252 to flow into the fourth pre-separation column 254 after passing through the first valve port e1 and the second valve port e2 in sequence, so as to be pre-separated in the fourth pre-separation column 254; and carbon dioxide and ethane are sequentially discharged from the fourth pre-separation column 254, and then enter the fourth chromatographic analytical column 255 for further separation after passing through the sixth valve port e6 and the fifth valve port e5 in sequence under the driving of the carrier gas, so that the time difference in separation of the components is increased. After the carbon dioxide and ethane components exist the fourth pre-separation column 254 and enter the fourth chromatographic analytical column 255, the fifth sample loading valve 251 of the third chromatographic column analysis system 23 is switched to the first setting position. The carrier gas is introduced from the fifth carrier gas tube 253 at a pressure of 250 kPa, and enters the fourth pre-separation column 254 from the outlet end of the fourth pre-separation column 254 through the seventh valve port e7 and the sixth valve port e6 in sequence, and the remaining components in the fourth pre-separation column 254 are flushed out of the third chromatographic column analysis system 23. A flow direction of the carrier gas is then adjusted. The carrier gas is introduced from the fifth carrier gas tube 253 at a pressure of 250 kPa, and enters the fourth chromatographic analytical column 255 after passing through the fourth valve port e4 and the fifth valve port e5 in sequence, and the carbon dioxide and ethane sequentially exit the fourth chromatographic analytical column 255 under the driving of the carrier gas and enter the second thermal conductivity detector 34 for detection so as to obtain the fifth detection chromatogram. See FIG. 10 for the fifth detection chromatogram.

[0229] The carrier gas is nitrogen.

[0230] The column temperature of the second chromatographic analytical column is 60 C.

[0231] The temperature of the second thermal conductivity detector 34 is 150 C., and the second thermal conductivity detector 34 has an operating current of 70 mA, and is anodic in polarity.

[0232] In step S7, contents of the sulfides in the natural gas sample are determined based on the obtained first detection chromatogram. Specifically, based on the obtained first detection chromatogram, the contents of carbon oxysulfide, hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, methyl ethyl sulfide, dimethyl disulfide, ethyl sulfide, carbon disulfide, n-butyl mercaptan, tert-butyl mercaptan, isopropyl mercaptan, and thiophene in the natural gas sample are determined using standard curves of the contents of the sulfides, and the results are shown in Table 1.

[0233] Contents of the hydrocarbons having C.sub.3 and higher in the natural gas sample are determined based on the obtained second detection chromatogram. Specifically, based on the obtained second detection chromatogram, the contents of propane, isobutane, n-butane, neopentane, isopentane, n-pentane, and C.sub.6.sup.+ hydrocarbon components in the natural gas sample are determined using standard curves of the contents of the hydrocarbons having C.sub.3 and higher, and the results are shown in Table 2.

[0234] Contents of the oxygen, nitrogen, methane and carbon monoxide in the natural gas sample are determined based on the obtained third detection chromatogram. Specifically, based on the obtained third detection chromatogram, the contents of the oxygen, nitrogen, methane and carbon monoxide in the natural gas sample are determined using standard curves of the contents of the oxygen, nitrogen, methane and carbon monoxide, and the results are shown in Table 3.

[0235] Contents of the carbon dioxide and ethane in the natural gas sample are determined based on the obtained fourth detection chromatogram. Specifically, based on the obtained fourth detection chromatogram, the contents of the carbon dioxide and ethane in the natural gas samples are determined using standard curves of the contents of the carbon dioxide and ethane, and the results are shown in Table 3.

[0236] Contents of the helium and hydrogen in the natural gas sample are determined based on the obtained fifth detection chromatogram. Specifically, based on the obtained fifth detection chromatogram, the contents of the helium and hydrogen in the natural gas sample are determined using standard curves of the contents of the helium and hydrogen, and the results are shown in

Table 4.

[0237] The standard curves of the contents of the sulfides is obtained in such a way that 7 bottles of standard substances of 4 types of sulfur compounds and 13 types of sulfur compounds at different concentration points are introduced into an instrument for analysis, each bottle of standard substance is repeatedly analyzed for 11 or more times, effective 11-injection component peak area data is collected, the average value of component peak areas during 11 injections is plotted against the corresponding content, and a profile of the concentration of each component as function of a response value is inspected. Calibration curves of 13 types of sulfur compounds are shown in the following Tables 5-17 and FIGS. 11-23.

[0238] The standard curves of the contents of the hydrocarbons having C.sub.3 and higher, the standard curves of the contents of the oxygen, nitrogen, methane and carbon monoxide, and the standard curves of the contents of the helium and hydrogen are obtained by the same method, and the results are shown in Tables 18-30 and FIGS. 24-36.

TABLE-US-00001 TABLE 1 Content (ppm) S/N LOD (S/N = 3) (ppm) H.sub.2S 5.03 4167.315329 0.004107 COS 5.02 6224.611520 0.002739 Methyl mercaptan 5.01 6566.940805 0.002607 Ethyl mercaptan 5.02 5970.898393 0.002854 Methyl sulfide 4.98 6374.534079 0.002667 CS.sub.2 4.99 14033.098416 0.001214 Isopropyl mercaptan 4.97 5456.459935 0.003098 Tert-butyl mercaptan 4.98 4907.412677 0.003449 Methyl ethyl sulfide 5.09 6540.707642 0.002655 Thiophene 5.12 7051.172391 0.002478 Ethyl sulfide 4.98 6265.610865 0.002668 n-butyl mercaptan 5.01 5403.188018 0.003151 Dimethyl disulfide 5.04 10803.035573 0.001581

TABLE-US-00002 TABLE 2 Content (%) S/N LOD (S/N = 3) (%) n-C.sub.6H.sub.14 0.201 17658.493960 0.000038 CH.sub.4 97.207 2272939.090391 0.000141 C.sub.2H.sub.6 0.197 10094.716574 0.000064 C.sub.3H.sub.8 0.199 10645.721892 0.000062 i-C.sub.4H.sub.10 0.2 10281.417050 0.000064 n-C.sub.4H.sub.10 0.2 10644.095409 0.000062 neo-C.sub.5H.sub.12 0.197 8484.621906 0.000077 i-C.sub.5H.sub.12 0.2 9580.508528 0.000069 n-C.sub.5H.sub.12 0.202 9284.511168 0.000072

TABLE-US-00003 TABLE 3 Content (%) S/N LOD (S/N = 3) (%) CO.sub.2 0.199 3808.073 0.000172 C.sub.2H.sub.6 0.197 2833.088 0.000229 O.sub.2 0.2 4977.471 0.000133 N.sub.2 0.2 3799.549 0.000174 CH.sub.4 97.207 411381.3 0.000780 CO 0.199 1504.117 0.000437

TABLE-US-00004 TABLE 4 Content (%) S/N LOD (S/N = 3) (%) He 0.199 11306.401497 0.000058 H.sub.2 0.2 17661.056323 0.000037

TABLE-US-00005 TABLE 5 Corresponding value table of concentration of hydrogen sulfide component and response value No. Peak area Content, mg/m.sup.3 1 7755 0.995 2 23123 3.01 3 35894 4.93 4 61473 7.05 5 77139 10.1 6 113568 15 7 145374 20.1 8 175204 25.2 9 223374 29.9 10 257488 35 11 293867 40.1 12 318306 44.5 13 362401 49.9

TABLE-US-00006 TABLE 6 Corresponding value table of concentration of carbon oxysulfide component and response value No. Peak area Content, mg/m.sup.3 1 8603 0.996 2 24695 3.01 3 37690 4.92 4 48431 7.06 5 80341 10.1 6 109724 15 7 148874 20.1 8 184133 27.7 9 234731 29.9 10 271912 35.1 11 311048 40.2 12 337337 44.5 13 378141 49.9

TABLE-US-00007 TABLE 7 Corresponding value table of concentration of methyl mercaptan component and response value No. Peak area Content, mg/m.sup.3 1 8364 0.992 2 24219 3 3 38070 4.92 4 49528 7.03 5 81729 10.1 6 110957 15.1 7 144832 20.1 8 179477 25.3 9 228265 29.8 10 262857 34.9 11 300462 40 12 325956 44.4 13 365652 49.7

TABLE-US-00008 TABLE 8 Corresponding value table of concentration of ethyl mercaptan component and response value No. Peak area Content, mg/m.sup.3 1 8539 0.994 2 24343 3 3 37681 4.92 4 49182 7.04 5 80886 10.1 6 111031 15 7 145870 20.1 8 180016 25.2 9 229900 29.8 10 263783 35 11 302057 40.1 12 327803 44.4 13 368402 49.8

TABLE-US-00009 TABLE 9 Corresponding value table of concentration of methyl sulfide component and response value No. 1 2 3 4 Peak area 39105 81791 110268 137852 Content, mg/m.sup.3 5.1 10.2 15.2 20.2

TABLE-US-00010 TABLE 10 Corresponding value table of concentration of carbon disulfide component and response value No. 1 2 3 4 Peak area 40022 84178 113526 141749 Content, mg/m.sup.3 5.17 10.3 15.3 20.5

TABLE-US-00011 TABLE 11 Corresponding value table of concentration of isopropyl mercaptan component and response value No. 1 2 3 4 Peak area 38399 80736 108164 135258 Content, mg/m.sup.3 5.07 10.1 15 20.1

TABLE-US-00012 TABLE 12 Corresponding value table of concentration of tert- butyl mercaptan component and response value No. 1 2 3 4 Peak area 38543 80962 108250 135598 Content, mg/m.sup.3 5.05 10.1 15.0 20.0

TABLE-US-00013 TABLE 13 Corresponding value table of concentration of methyl ethyl sulfide component and response value No. 1 2 3 4 Peak area 37895 79999 107262 134436 Content, mg/m.sup.3 5.14 10.3 15.3 20.3

TABLE-US-00014 TABLE 14 Corresponding value table of concentration of thiophene component and response value No. 1 2 3 4 Peak area 38278 80734 108777 136348 Content, mg/m.sup.3 5.06 10.1 15.0 20.0

TABLE-US-00015 TABLE 15 Corresponding value table of concentration of ethyl sulfide component and response value No. 1 2 3 4 Peak area 38654 81228 108819 136410 Content, mg/m.sup.3 5.04 10.1 15.0 20.0

TABLE-US-00016 TABLE 16 Corresponding value table of concentration of n-butyl mercaptan component and response value No. 1 2 3 4 Peak area 36725 77902 104555 131298 Content, mg/m.sup.3 5.04 10.1 15.0 20.0

TABLE-US-00017 TABLE 17 Corresponding value table of concentration of dimethyl disulfide component and response value No. 1 2 3 4 Peak area 37989 79919 107123 134151 Content, mg/m.sup.3 4.99 10.0 15.0 20.0

TABLE-US-00018 TABLE 18 Corresponding value table of concentration of carbon dioxide component and response value No. 1 2 3 4 5 6 Peak area 276 2688 50784 90583 131274 183647 Reference value of 0.0105 0.105 1.93 3.46 5.02 7.01 standard substance, y, %

TABLE-US-00019 TABLE 19 Corresponding value table of concentration of ethane component and response value No. 1 2 3 4 5 6 Peak area 277 2688 52359 97512 138525 189990 Reference value of 0.0105 0.106 1.83 3.4 4.85 6.63 standard substance, y, %

TABLE-US-00020 TABLE 20 Corresponding value table of concentration of nitrogen component and response value No. 1 2 3 4 5 6 Peak area 867 5710 65424 122862 207039 288884 Reference value of 0.0281 0.189 1.73 3.49 5.32 7.39 standard substance, y, %

TABLE-US-00021 TABLE 21 Corresponding value table of concentration of helium component and response value No. 1 2 3 4 Peak area 1517 7540 41303 72947 Content, mg/m.sup.3 0.0105 0.088 0.513 0.93

TABLE-US-00022 TABLE 22 Corresponding value table of concentration of hydrogen component and response value No. 1 2 3 4 Peak area 1424 12544 190478 370350 Content, mg/m.sup.3 0.0114 0.09 1.36 2.67

TABLE-US-00023 TABLE 23 Corresponding value table of concentration of hexane component and response value No. 1 2 3 4 5 6 Peak area 162737 1181843 1834728 2267348 3199737 3292007 Reference value of 0.013 0.0923 0.131 0.201 0.262 0.282 standard substance, y, %

TABLE-US-00024 TABLE 24 Corresponding value table of concentration of propane component and response value No. 1 2 3 4 5 6 Peak area 74514 840546 6689402 12540797 18536241 25084340 Reference value of 0.0105 0.114 0.883 1.85 2.39 3.24 standard substance, y, %

TABLE-US-00025 TABLE 25 Corresponding value table of concentration of carbon monoxide component and response value No. 1 2 3 4 5 6 Peak area 3242 8645 13585 22539 27093 120340 Reference value of 0.084 0.224 0.352 0.584 0.702 3.24 standard substance, y, %

TABLE-US-00026 TABLE 26 Corresponding value table of concentration of isobutane component and response value No. 1 2 3 4 5 6 Peak area 197855 1022004 3058375 4649287 7216474 9990056 Reference value of 0.0209 0.105 0.306 0.522 0.704 0.977 standard substance, y, %

TABLE-US-00027 TABLE 27 Corresponding value table of concentration of n-butane component and response value No. 1 2 3 4 5 6 Peak area 247785 1151669 2974204 4510332 7051530 9831076 Reference value of 0.0264 0.119 0.299 0.507 0.688 0.960 standard substance, y, %

TABLE-US-00028 TABLE 28 Corresponding value table of concentration of neopentane component and response value No. 1 2 3 4 5 6 Peak area 315140 1512452 2875956 3466614 5151799 6773936 Reference value of 0.0265 0.124 0.23 0.311 0.4 0.526 standard substance, y, %

TABLE-US-00029 TABLE 29 Corresponding value table of concentration of isopentane component and response value No. 1 2 3 4 5 6 Peak area 299733 1332670 2654538 3339374 4684940 6288516 Reference value of 0.0261 0.113 0.218 0.307 0.372 0.498 standard substance, y, %

TABLE-US-00030 TABLE 30 Corresponding value table of concentration of n-pentane component and response value No. 1 2 3 4 5 6 Peak area 303535 1270585 2616985 3370006 5092523 6586821 Reference value of 0.0264 0.107 0.213 0.31 0.401 0.52 standard substance, y, %

[0239] In step S8, based on the obtained contents of the sulfides in the natural gas sample, the hydrocarbons having C.sub.3 and higher in the natural gas sample, the oxygen, nitrogen, methane and carbon monoxide in the natural gas sample, the carbon dioxide and ethane in the natural gas sample, and the helium and hydrogen in the natural gas sample, determining the natural gas high calorific value, the total sulfur content (in terms of sulfur, in mg/m.sup.3), the hydrogen sulfide content (in mg/m.sup.3), and the carbon dioxide content (in mole percent).

[0240] In the analysis method, as can be seen from FIGS. 7 to 10, the degree of separation of each target component is high, with LOD (S/N=3)<50 ppm. The degrees of separation are all greater than 1, where the degrees of separation of i-C.sub.4H.sub.1 and n-C.sub.4H.sub.10 can reach 4.45, the degrees of separation of CH.sub.4 and CO can reach 5.245, and the degrees of separation of H.sub.2S and COS can reach 2.701.

[0241] Although the principle and implementations of the present invention are described in the present invention by using specific embodiments, the above description of the embodiments is merely intended to help understand the methods and core concept of the present invention. In addition, for those of ordinary skill in the art, changes may be made to the specific implementations and the scope of application according to the concept of the present invention. In conclusion, the content of the description should not be construed as a limitation to the present invention.