RESIDUAL GAS HEAT EXCHANGE COMBUSTION-SUPPORTING SYSTEM BASED ON METHANOL-WATER MIXTURE REFORMING HYDROGEN PRODUCTION SYSTEM, AND METHOD THEREOF

Abstract

The invention discloses residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system and a method thereof, wherein the residual gas heat exchange combustion-supporting system comprises a reformer, a heat exchange tube and an air intake device: the reformer is provided with a reforming chamber, a separating device, a combustion chamber and an exhaust vent, the residual gas produced by the reformer is discharged from the exhaust vent to the first delivery passage of the heat exchange, tube; the heat exchange tube has coaxial double-layer first and second delivery passages. The invention enables to fully reclaim the heat from the residual gas discharged by the reformer, so that the outside air is warmed before entering the reformer, which in turn makes the warmed outside air attain a very good combustion-supporting effect.

Claims

1. A residual gas heat exchange and combustion-supporting system based on a methanol-water mixture reforming hydrogen production system, characterized by comprising: a reformer, a heat exchange tube and an air intake device: wherein the reformer is provided with a reforming chamber, a separating device, a combustion chamber and an exhaust vent; the reforming chamber is configured to produce a mixed gas of hydrogen and carbon dioxide from a reforming reaction for producing hydrogen between methanol and steam; the separating device is configured to separate the produced hydrogen out; the combustion chamber is configured to burn part of the produced hydrogen with the oxygen in the outside air to provide heat for the operation of the reformer; the carbon dioxide separated out by the separating device, the water vapor generated by combustion of the hydrogen and the oxygen in the combustion chamber and the unburned gas in the outside air are mixed into residual gas; the residual gas is discharged from the exhaust vent to the first delivery passage of the heat exchange tube; and wherein the heat exchange tube is provided with a coaxial double-layer first delivery passage and a second delivery passage; at one end of the heat exchange tube, the first delivery passage is communicated with the exhaust vent, and the second delivery passage is communicated with an air inlet of the combustion chamber of the reformer; at the other end of the heat exchange tube, the first delivery passage is provided with a residual gas outlet, and the second delivery passage is connected with an air intake device; the outside air input by the air intake device is configured to exchange heat with the residual gas from the first delivery passage inside the second delivery passage; resulting in warmed outside air entering into the combustion chamber of the reformer for supporting combustion, and cooled residual gas discharging from the residual gas outlet of the first delivery passage.

2. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 1, characterized by further comprising a gas-water separator; wherein the gas-water separator comprises a gas-water separator body and a gas-water inlet, an air outlet and a water outlet provided on the gas-water separator body; the gas-water inlet is communicated with the residual gas outlet of the first delivery passage; and the air outlet is connected with an exhaust fan.

3. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 2, characterized by further comprising a methanol-water mixture storage and delivery device; the methanol-water mixture storage and delivery device comprises a methanol-water mixture storage vessel and a delivery pump; the methanol-water mixture storage vessel is configured to store liquid methanol and water feedstock and the delivery pump is configured to deliver the methanol and water feedstock stored in the methanol-water mixture storage vessel to the reformer; and the water output by the gas-water separator is supplied to the methanol-water mixture storage vessel as a water feedstock.

4. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 2, characterized in that the water outlet of the water-gas separator is connected with a water purifier; an RO-membrane water purifying device is provided in the water purifier, and water purified through the water purifier is outputted to a water purification tank.

5. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 4, characterized by further comprising a methanol-water mixture storage and delivery device; wherein the methanol-water mixture storage and delivery device comprises a methanol-water mixture storage vessel and a delivery pump; the methanol-water mixture storage vessel is configured to store liquid methanol and water feedstock and the delivery pump is configured to deliver the methanol and water feedstock stored in the methanol-water mixture storage vessel to the reformer; and the water outputted from the water purification tank is supplied to the methanol-water mixture storage vessel as a water feedstock.

6. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 3, characterized in that a heat exchanger is provided on the delivery line between the methanol-water mixture storage and delivery device and the reformer; the, methanol and water feedstock, at a low temperature exchanges heat with the hydrogen at a high temperature output from the reforming chamber in the heat exchanger; the methanol and water feedstock is, warmed and vaporized; the hydrogen output from a gas producing end of the separating device is cooled after passing through the heat exchanger.

7. The residual, gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 1, characterized in that the heat exchange tube is wound helically around a shell of the reformer, the upper end of the heat exchange tube is the end communicated with the exhaust vent of the reformer and the air inlet of the combustion chamber of the reformer, and the lower end of the heat exchange tube is the end connecting the air intake device and the residual gas outlet.

8. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 1, characterized in that, the heat exchange tube is any one of a coaxial double-layer titanium alloy corrugated pipe, a coaxial double-layer magnesium alloy corrugated pipe, a coaxial double-layer aluminum corrugated pipe, a coaxial double-layer copper corrugated pipe, and a coaxial double-layer stainless steel corrugated pipe.

9. A method of the residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 1, characterized by comprising the following steps: (1) during operation of a reformer, discharging an oxygen-deficient, water vapor-containing and high-heat residual gas from the exhaust vent; the residual gas enters into a first delivery passage of a heat exchange tube from one end of the heat exchange tube; and meanwhile, during operation of an air intake device, bringing outside air introduced from an air intake device into a second delivery passage of the, heat exchange tube from the other end of the heat exchange tube; and (2) exchanging heat between the outside air in the second delivery passage and the residual gas in the first delivery passage, resulting in that the outside air is warmed and, turns into a high-heat air, and enters the combustion chamber of the reformer for supporting combustion; and meanwhile, the residual gas is cooled and turns into residual gas with low heat, and the water vapor in the residual gas is condensed into condensed water, both the residual gas and the condensed water being discharged from the residual gas outlet of the first delivery passage.

10. The method of the residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 9, characterized in that both of the residual gas and the condensed water discharged by the residual gas outlet of the first delivery passage enter the gas-water separator for separation, the separated residual gas is discharged to the outside through an exhaust fan, and the separated condensed water is used as a water feedstock for operation of the reformer.

11. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 5, characterized in that a heat exchanger is provided on the delivery line between the methanol-water mixture storage and delivery device and the reformer the methanol and water feedstock at a low temperature exchanges heat with the hydrogen at a high temperature output from the reforming chamber in the heat exchanger; the methanol and water feedstock is armed and vaporized; the hydrogen output from a gas producing end of the separating device is cooled after passing through the heat exchanger.

12. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 2, characterized in that the heat exchange tube is wound helically around a shell of the reformer, the upper and of the heat exchange tube is the end communicated with the exhaust vent of the reformer and the air inlet of the combustion chamber of the reformer, and the lower end of the heat exchange tube is the end connecting the air intake device and the residual gas outlet.

3. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 3, characterized in that the heat exchange tube is wound helically around a shell of the reformer, the upper end of the heat exchange tube is the end communicated with the exhaust vent of the reformer and the air inlet of the combustion chamber of the reformer, and the lower end of the heat exchange tube is the end connecting the air intake device and the residual gas outlet.

14. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 4, characterized in that the heat exchange tube is wound helically around, a shell of the reformer, the upper end of the heat exchange tube is the end communicated with the exhaust vent of the reformer and the air inlet of the combustion chamber of the reformer, and the lower end of the heat exchange tube is the end connecting the air intake device and the residual gas outlet.

15. The residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system according to claim 5, characterized in that the heat exchange tube is wound helically around a shell of the reformer, the upper end of the heat exchange tube is the end communicated with the exhaust vent of the reformer and the air inlet of the combustion chamber of the reformer, and the lower end of the heat exchange tube is the end connecting the air intake device and the residual gas outlet.

Description

DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 is a block schematic diagram showing the overall structure of the present invention.

[0030] FIG. 2 is a longitudinal cross-sectional view showing the structure sketch of principal design of a preferred embodiment of the present invention.

[0031] FIG. 3 is a longitudinal cross-sectional view showing the structure sketch of principal design of another preferred embodiment of the present invention.

[0032] FIG. 4 is a schematic cross-sectional structure view of a heat exchange tube.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0033] The following are further descriptions of the invention with reference to figures and examples of their applications.

[0034] As shown in FIGS. 1, 2 and 3, the present invention is residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system. The system comprises a reformer 1, a heat exchange tube 2 and >an air intake device 3. The reformer 1 is provided with a reforming chamber, a separating device, a combustion chamber and an exhaust vent 11, the reforming chamber is used for producing a mixed gas of hydrogen and carbon dioxide from a reforming reaction for hydrogen production between methanol and steam, the temperature of the reforming chamber is 300-570 C., and the reforming chamber is provided with a catalyst, in the reforming chamber, the methanol and the steam are subjected to methanol cracking reaction and carbon monoxide conversion reaction in the reforming chamber at a temperature of 50-570 C. and pressure of 1-5 MPa in the presence of a catalyst to generate hydrogen and carbon dioxide, and the system is a multi-component and multi-reaction gas-solid catalytic reaction system, the reaction equations are as follows: (1) CH3OH.fwdarw.CO+2H2, (2) H2O+CO.fwdarw.CO2+H2, (3) CH3OH+H2O.fwdarw.CO2+3H2, the H2 and CO2 produced from the reforming reaction; the separating device is used for separating the produced hydrogen. The separating device is preferably a membrane separating device which is a membrane separating device prepared by vacuum-plating palladium-silver alloy on the surface of the porous ceramics, the coating layer is a palladium-silver alloy, palladium accounts for 75%-78% of the mass percent of the palladium-silver alloys, and silver accounts for 22%-25% of the palladium-silver alloys, and the temperature in the separating device is the same as or close to that in the reforming chamber; the combustion chamber is used for the combustion of the partially prepared hydrogen and the oxygen in the outside air to provide heat for the operation of the reformer; the carbon dioxide separated out by the separating device, the water vapor generated by combustion of the hydrogen and the oxygen in the combustion chamber and the unburned gas in the outside air are mixed into residual gas which is discharged from the exhaust vent 11 to the first delivery passage of the heat exchange tube 2;

[0035] the heat exchange tube 2, having coaxial double-layer first and second delivery passage, and the first delivery passage is communicated with the exhaust vent 11 at one end of the heat exchange tube 2, while the second delivery passage is communicated with the air inlet 12 of the combustion chamber of the reformer; at the other end of the heat exchange tube 2, the first delivery passage is provided with residual gas outlet, and the second delivery passage is connected with, the air intake device 3; the outside air input by the air intake device 3 in the second delivery passage exchanges heat with the residual gas in the first delivery passage, the outside air with a raised temperature enters the combustion chamber of the reformer for supporting combustion, and the residual gas with a lowered temperature is discharged from the residual gas outlet of the first delivery passage.

[0036] One should also note that, with reference to FIG. 4, the present invention adopts the names of the first transport delivery passage and the second delivery passage, and does not use to restrict the name of the outer-layer passage 11 and the inner-layer passage 12 of the heat exchange tube, but is used for distinguishing the outer-layer passage 11 and the inner-layer passage 12 of the heat exchange tube. In FIG. 2, the first delivery passage refers to the outer-layer passage 11 of the heat exchange tube, while the second delivery passage refers to the inner-layer passage 12 of the heat exchange tube; in FIG. 3, the first delivery passage refers to the inner-layer passage 12 of the heat exchange tube, while the second delivery passage refers to the outer-layer passage 11 of the heat exchange tube. As can be seen from the introduction, when the residual gas is delivered by the outer-layer passage 11 of the heat exchange tube, while the outside air is delivered by the inner-layer passage 12 of the heat exchange tube; when the residual gas is delivered by the inner-layer passage 12 of the heat exchange tube, while the outside air is delivered by the outer-layer passage 11 of the heat exchange tube.

[0037] As shown in FIGS. 1, 2 and 3, the residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system is further provided with a gas-water separator 4 which comprises a gas-water separator body 41, and a gas-water inlet 42, an air outlet 43 and a water outlet 44 provided on the gas-water separator body, wherein the gas-water inlet 42 is communicated with the residual gas outlet of the first delivery passage, and the air outlet 43 is connected with the exhaust fan 5.

[0038] As shown in FIGS. 1, 2 and 3, the water outlet 44 of the water-gas separator 4 is connected with a water purifier 6 in which an RO-membrane water purifying device is provided, and the water purified by the water purifier 6 is output to the water purification tank 7.

[0039] As shown in FIG. 1, the residual gas heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system further comprises a methanol-water mixture storage and delivery device 8 including a methanol-water mixture storage vessel and a delivery pump, the methanol-water mixture storage vessel is stored with liquid methanol and water feedstock, and the delivery pump is used for delivering the methanol and water feedstock stored in the methanol-water mixture storage vessel to the reformer 1; the water output by the gas-water separator 4 or the water output by the water purification tank 7 is supplied to the methanol-water mixture storage vessel as a water feedstock, and the remaining water can be used for other purposes.

[0040] As shown in FIG. 1, a heat exchanger 9 is provided on the delivery line between the methanol-water mixture storage and delivery device 8 and the reformer 1, a low-temperature methanol and water feedstock exchanges heat with the high-temperature hydrogen output from the reforming chamber in the heat exchanger 9, and the methanol and water feedstock is warmed and vaporized; the hydrogen output from the gas producing end of the separating device is cooled by the heat exchanger 9. As shown in FIGS. 2 and 3, the heat exchange tube 2 is wound helically around a shell of the reformer 1, which can not only save the space volume occupied by the heat exchange tube 2, but also can fully lengthen the heat exchange tube 2. The upper end of the heat exchange tube 2 is one end communicating the exhaust vent 11 of the reformer with the air inlet 12 of the combustion chamber of the reformer, and the lower end of the heat exchange tube 2 is one end connecting an air intake device 3 with residual gas outlet, which is conducive to rapidly lowering temperature of the high-temperature residual gas upon cooling, and rapidly raising the temperature of the outside air upon heat.

[0041] In the above-mentioned technical solution, the heat exchange tube is any one of a coaxial double-layer titanium alloy corrugated pipe, a coaxial double-layer magnesium alloy corrugated pipe, a coaxial double-layer aluminum corrugated pipe, a coaxial double-layer copper corrugated pipe, and a coaxial double-layer stainless steel corrugated pipe, which has an extremely good rigidity performance.

[0042] The above method of the residual gas, heat exchange combustion-supporting system based on a methanol-water mixture reforming hydrogen production system comprises the following steps:

[0043] (1) during the operation of the reformer, an oxygen-deficient, water vapor-containing and high-heat residual gas is discharged from the exhaust vent, and the residual gas enters the first delivery passage of the heat exchange tube from one end of the heat exchange tube; at the same time, the air intake device is operating and the outside air from the air intake device enters the second delivery passage of the heat exchange tube from the other end of the heat exchange tube;

[0044] (2) the outside air in the second delivery passage exchanges heat with the residual gas in the first delivery passage, the outside air is warmed to turn into a high-heat air, and enters the combustion chamber of the reformer for supporting combustion; at the same time, the residual gas is cooled to turn into residual gas of low heat, and the water vapor in the residual gas is condensed into condensed water which is all discharged from the residual gas outlet of the first delivery passage.

[0045] Further, the residual gas and the condensed water discharged by the residual gas outlet of the first delivery passage both enter the gas-water separator, the residual gas is discharged to the outside world via an exhaust fan, and the condensed water is used as a water feedstock for operation of the reformer.

[0046] The above-described embodiments of, the invention are only the preferred embodiments of the present invention, which may be modified or varied within the scope of the claims and their equivalents, and the invention may be practiced otherwise than as specifically described.