Abstract
A non-oxygen-consuming energy storage system includes: an interconnecting pipe, connecting a heat recovery boiler or a flue gas header to a chimney or its flue gas duct; a gas inducing equipment along the interconnecting pipe, inducing gas inside the heat recovery boiler to enter the interconnecting pipe through the chimney and then enter the heat recovery boiler; and a heater along the interconnecting pipe and heating up the gas in the interconnecting pipe, and using electricity or other non-oxygen-consuming heating devices as a heat source. Thereby, the gas in the heat recovery boiler is circulated and heated up by the system, and pipelines and components of each unit are kept in a hot standby condition, thus under an emergency power demand on the power grid, the combined cycle unit can rapidly ramp up its load to meet the demand, and can also reduce energy consumption during start-up stage.
Claims
1. A non-oxygen-consuming energy storage system, comprising: an interconnecting pipe used to connect a heat recovery boiler or a flue gas header to a chimney, or connect the heat recovery boiler and a flue gas duct of the chimney; a gas inducing equipment, which is installed along the interconnecting pipe, is used to induces gas inside the heat recovery boiler to enter the interconnecting pipe through the chimney, and is used to force the gas in the interconnecting pipe to enter an interior of the heat recovery boiler; and a heater installed along the interconnecting pipe and used to heat up the gas in the interconnecting pipe.
2. The non-oxygen-consuming energy storage system according to claim 1, further comprising at least one damper, wherein the at least one damper is installed along the interconnecting pipe and used to control flow of gas through the interconnecting pipe.
3. The non-oxygen-consuming energy storage system according to claim 2, wherein the at least one damper is located between the gas inducing equipment and the chimney.
4. The non-oxygen-consuming energy storage system according to claim 2, wherein the non-oxygen-consuming energy storage system comprises two dampers, one of the dampers is located between the gas inducing equipment and the chimney or the flue gas duct, and another of the dampers is located between the heater and the heat recovery boiler or the flue gas header.
5. The non-oxygen-consuming energy storage system according to claim 1, wherein the heater is located between the heat recovery boiler or the flue gas header and the gas inducing equipment.
6. The non-oxygen-consuming energy storage system according to claim 2, wherein the heater is located between the heat recovery boiler or the flue gas header and the gas inducing equipment.
7. The non-oxygen-consuming energy storage system according to claim 3, wherein the heater is located between the heat recovery boiler or the flue gas header and the gas inducing equipment.
8. The non-oxygen-consuming energy storage system according to claim 4, wherein the heater is located between the heat recovery boiler or the flue gas header and the gas inducing equipment.
9. A combined cycle unit, comprising: a gas turbine module; a boiler module, which includes a heat recovery boiler, a flue gas header and a chimney, wherein the flue gas header connects the gas turbine module and the heat recovery boiler, and the chimney is installed on the heat recovery boiler or installed outside the heat recovery boiler, and is connected to the heat recovery boiler through a flue gas duct; and a non-oxygen-consuming energy storage system, which includes an interconnecting pipe, a gas inducing equipment and a heater, wherein the interconnecting pipe connects the heat recovery boiler or the flue gas header to the chimney or the flue gas duct, the gas inducing equipment is installed along the interconnecting pipe, is used to induces gas inside the heat recovery boiler to enter the interconnecting pipe through the chimney, and is used to force the gas in the interconnecting pipe to enter an interior of the heat recovery boiler, and the heater is installed along the interconnecting pipe and used to heat up the gas in the interconnecting pipe.
10. The combined cycle unit according to claim 9, wherein the non-oxygen-consuming energy storage system further includes at least one damper, and the at least one damper is installed along the interconnecting pipe and used to control flow of gas through the interconnecting pipe.
11. The combined cycle unit according to claim 10, wherein the at least one damper is located between the gas inducing equipment and the chimney.
12. The combined cycle unit according to claim 10, wherein the non-oxygen-consuming energy storage system includes two dampers, one of the dampers is located between the gas inducing equipment and the chimney or the flue gas duct, and another of the dampers is located between the heater and the heat recovery boiler or the flue gas header.
13. The combined cycle unit according to claim 9, wherein the heater is located between the heat recovery boiler and the gas inducing equipment.
14. The combined cycle unit according to claim 10, wherein the heater is located between the heat recovery boiler and the gas inducing equipment.
15. The combined cycle unit according to claim 11, wherein the heater is located between the heat recovery boiler and the gas inducing equipment.
16. The combined cycle unit according to claim 12, wherein the heater is located between the heat recovery boiler and the gas inducing equipment.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a schematic diagram of a first embodiment of a combined cycle unit of the present invention.
[0021] FIG. 2 is a schematic diagram of the operation of a non-oxygen-consuming energy storage system of the first embodiment of the combined cycle unit of the present invention.
[0022] FIG. 3 is a schematic diagram of the operation of a gas turbine generator of the first embodiment of the combined cycle unit of the present invention.
[0023] FIG. 4 is a schematic diagram of the synchronous operation of the gas turbine generator and the non-oxygen-consuming energy storage system of the first embodiment of the combined cycle unit of the present invention.
[0024] FIG. 5 is a schematic diagram of a second embodiment of the combined cycle unit of the present invention.
[0025] FIG. 6 is a schematic diagram of the operation of the non-oxygen-consuming energy storage system of the second embodiment of the combined cycle unit of the present invention.
[0026] FIG. 7 is a schematic diagram of a third embodiment of the combined cycle unit of the present invention.
[0027] FIG. 8 is a schematic diagram of a fourth embodiment of the combined cycle unit of the present invention.
[0028] FIG. 9 is a schematic diagram of a fifth embodiment of the combined cycle unit of the present invention.
[0029] FIG. 10 is a schematic diagram of a sixth embodiment of the combined cycle unit of the present invention.
[0030] FIG. 11 is a schematic diagram of a seventh embodiment of the combined cycle unit of the present invention.
[0031] FIG. 12 is a schematic diagram of the operation of the non-oxygen-consuming energy storage system of the seventh embodiment of the combined cycle unit of the present invention.
[0032] FIG. 13 is a schematic diagram of an eighth embodiment of the combined cycle unit of the present invention.
[0033] FIG. 14 is a schematic diagram of the operation of the non-oxygen-consuming energy storage system of the eighth embodiment of the combined cycle unit of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0034] Herein after, a more detailed description of the implementations of the present invention is made with reference to drawings and reference numerals, in order that those skilled in the art can implement them after studying this specification.
[0035] FIG. 1 is a schematic diagram of a first embodiment of a combined cycle unit of the present invention. As shown in FIG. 1, the present invention provides a combined cycle unit, comprising a gas turbine module 10, a boiler module 20, a non-oxygen-consuming energy storage system 30, and a steam turbine module 40. The gas turbine module 10 includes a gas turbine generator 11, an air source 12, an air inlet pipe 13, a fuel source 14, and a feed pipe 15, wherein the air inlet pipe 13 connects the air source 12 and the gas turbine generator 11, and the feed pipe 15 connects the fuel source 14 and the gas turbine generator 11. The boiler module 20 includes a heat recovery boiler 21, a flue gas header 22, a plurality of heating tube banks 23, a steam drum 24, an evaporator tube bank 25, a steam pipe 26, and a chimney 27. The flue gas header 22 connects the gas turbine generator 11 and the heat recovery boiler 21. The heating tube banks 23 are installed in the heat recovery boiler 21. The steam drum 24 is installed on one side of the heat recovery boiler 21. The evaporator tube bank 25 connects the steam drum 24 and the heat recovery boiler 21. The steam pipe 26 connects the heat recovery boiler 21 and the steam drum 24. The chimney 27 is installed on the heat recovery boiler 21. The non-oxygen-consuming energy storage system 30 includes an interconnecting pipe 31, a damper 32, a gas inducing equipment 33, and a heater 34. The interconnecting pipe 31 connects the heat recovery boiler 21 and the chimney 27. The damper 32 is installed along the interconnecting pipe 31, and is used to control the flow of gas through the interconnecting pipe 31. The gas inducing equipment 33 is installed along the interconnecting pipe 31, is used to induce gas inside the heat recovery boiler 21 to enter the interconnecting pipe 31 through the chimney 27, and is used to force the gas in the interconnecting pipe 31 to enter the interior of the heat recovery boiler 21. The heater 34 is installed along the interconnecting pipe 31, and is used to heat up the gas in the interconnecting pipe 31. The steam turbine module 40 includes a steam turbine 41, a first steam header 42, a condenser 43, and a second steam header 44, wherein the first steam header 42 connects the heat recovery boiler 21 and the steam turbine 41, and the second steam header 44 connects the steam turbine 41 and the condenser 43.
[0036] FIG. 2 is a schematic diagram of the operation of a non-oxygen-consuming energy storage system 30 of the first embodiment of the combined cycle unit of the present invention. As shown in FIG. 2, when the gas turbine generator 11 is in a shutdown state, the damper 32 is opened and the gas inducing equipment 33 and the heater 34 are started, the gas inducing equipment 33 induces the gas in the heat recovery boiler 21 to enter the interconnecting pipe 31 through the chimney 27, the gas passes through the damper 32, the heater 34 heats up the gas in the interconnecting pipe 31, and the hot gas is forced by the gas inducing equipment 33 and enters the interior of the heat recovery boiler 21. The hot gas heats up the water in the heating tube banks 23 to a high temperature, and the high-temperature water/steam further heats up various components of the heat recovery boiler 21 such as the steam drum 24, the evaporator tube bank 25 and the steam pipe 26, to maintain the various components of the heat recovery boiler 21 in a high-temperature state. The high-temperature steam generated by the heat recovery boiler 21 enters the interior of the steam turbine 41 through the first steam header 42, thereby pushing an impeller (not shown) of the turbine 41 to rotate to generate power, and maintaining the first steam header 42 and the steam turbine 41 in a high-temperature state. The outlet steam of the steam turbine 41 enters the condenser 43 through the second steam header, thereby maintaining the vacuum level of the outlet of the steam turbine 41 by condensation of the steam. Therefore, since the non-oxygen-consuming energy storage system 30 can circulate and heat up the gas in the heat recovery boiler 21, each component of the heat recovery boiler 21, the first steam header 42 and the steam turbine 41 all can be maintained in a high-temperature state. When the gas turbine generator 11 is started, the time required for the combined cycle unit of the present invention to transition from start-ignition to a full-load state can be reduced, thereby improving the energy consumption efficiency during the start-up of the combined cycle unit of the present invention.
[0037] FIG. 3 is a schematic diagram of the operation of the gas turbine generator 11 of the first embodiment of the combined cycle unit of the present invention. As shown in FIG. 3, when the gas turbine generator 11 operates, the air source 12 provides cold air, which is delivered to the gas turbine generator 11 through the air inlet pipe 13, and the fuel source 14 provides fuel, which is delivered to the gas turbine generator 11 through the feed pipe 15, and the gas turbine generator 11 is started by ignition and starts burning the fuel, to generate power and a large amount of high-temperature flue gas. The high-temperature flue gas enters the heat recovery boiler 21 through the flue gas header 22, and heats up the water in the heating tube banks 23 to a high temperature, the evaporator tube bank 25 collects the steam into the steam drum 24, the steam drum 24 provides the steam to the heating tube banks 23 through the steam pipe 26, to increase the temperature of the steam, and the heat recovery boiler 21 will generate high-temperature steam and exhaust gas. At this time, the damper 32, the gas inducing equipment 33 and the heater 34 are closed, such that the gas inside the heat recovery boiler 21 will not enter the interconnecting pipe 31 through the chimney 27. The first steam header 42 delivers the high-temperature steam to the steam turbine 41, such that the high-temperature steam can push the impeller of the steam turbine 41 to rotate to generate power. The outlet steam of the steam turbine 41 enters the condenser 43 through the second steam header 44, thereby maintaining the vacuum level of the outlet of the steam turbine 41 by condensation of the steam. A damper 271 in the top opening of the chimney 27 is opened, and then the chimney 27 can discharge the exhaust gas outward.
[0038] FIG. 4 is a schematic diagram of the synchronous operation of the gas turbine generator and the non-oxygen-consuming energy storage system of the first embodiment of the combined cycle unit of the present invention. As shown in FIG. 4, when the gas turbine generator 11 and the non-oxygen-consuming energy storage system 30 operate synchronously, the air source 12 provides cold air, which is delivered to the gas turbine generator 11 through the air inlet pipe 13, and the fuel source 14 provides fuel, which is delivered to the gas turbine generator 11 through the feed pipe 15, and the gas turbine generator 11 is started by ignition and starts burning the fuel, to generate power and a large amount of high-temperature flue gas. The high-temperature flue gas enters the heat recovery boiler 21 through the flue gas header 22, at the same time, the damper 32 is opened and the gas inducing equipment 33 and the heater 34 are started, the gas inducing equipment 33 induces the gas in the heat recovery boiler 21 to enter the interconnecting pipe 31 through the chimney 27, the gas passes through the damper 32, the heater 34 heats up the gas in the interconnecting pipe 31, and the hot gas is forced by the gas inducing equipment 33 and enters the interior of the heat recovery boiler 21. The temperature of the flue gas provided by the gas turbine generator 11 is higher, while the temperature of the flue gas provided by the non-oxygen-consuming energy storage system 30 is lower. The flue gas provided by the gas turbine generator 11 and the flue gas provided by the non-oxygen-consuming energy storage system 30 are mixed to form a mixed flue gas. The mixed flue gas entering the heat recovery boiler can reduce the temperature difference between the various components of the heat recovery boiler and the mixed flue gas, such that during the start-up of the non-oxygen-consuming energy storage system 30 of the combined cycle unit of the present invention, the gas turbine generator 11 can operate at a higher load. Therefore, during the start-up of the combined cycle unit of the present invention, the gas turbine generator 11 at high-load can improve the operating efficiency of the combined cycle unit, thereby reducing the fuel consumption during the start-up of the combined cycle unit. In some embodiments, the heater 34 may also not be started, such that the gas in the interconnecting pipe 31 is not heated; under this circumstance, the above-mentioned effects can still be achieved, and an energy-saving effect is also achieved.
[0039] In a preferred embodiment, the damper 32 is located between the gas inducing equipment 33 and the chimney 27. When the damper 32 is closed, even if the gas inducing equipment 33 is opened, the gas inside the heat recovery boiler 21 cannot enter the interconnecting pipe 31 through the chimney 27, which prevents the gas from returning to the heat recovery boiler 21 through the interconnecting pipe 31, thereby preventing the reduction of the operating efficiency of the heat recovery boiler 21. Only after the damper 32 is opened, the gas inducing equipment 33 can induce the gas inside the heat recovery boiler 21 to enter the interconnecting pipe 31 through the chimney 27.
[0040] In a preferred embodiment, the heater 34 is located between the heat recovery boiler 21 and the gas inducing equipment 33. Therefore, the gas first passes through the damper 32 and the gas inducing equipment 33 along the interconnecting pipe and then is heated up by the heater 34, such that the hot gas can directly return to the interior of the heat recovery boiler 21 without passing through any intermediate components, thereby improving the utilization efficiency of the hot gas.
[0041] In some embodiments, the positions of the damper 32, the gas inducing equipment 33 and the heater 34 may be exchanged. For example, the gas inducing equipment 33 is located between the damper 32 and the chimney 27, and the heater 34 is located between the heat recovery boiler 21 and the damper 32. For example, the heater 34 is located between the damper 32 and the chimney 27, and the gas inducing equipment 33 is located between the heat recovery boiler 21 and the damper 32. For example, the gas inducing equipment 33 is located between the heater 34 and the chimney 27, and the damper 32 is located between the heat recovery boiler 21 and the heater 34. For example, the damper 32 is located between the heater 34 and the chimney 27, and the gas inducing equipment 33 is located between the heat recovery boiler 21 and the heater 34.
[0042] Preferably, the heater 34 is a resistive or inductive heater or a non-oxygen-consuming temperature boosting device, the gas inducing equipment 33 is a circulating fan, a blower, or other gas delivery device with similar functions, and the damper 32 is a butterfly valve, a gate valve, a louver, a sluice gate or other shut-off valve with similar functions, but the present invention is not limited thereto.
[0043] FIG. 5 is a schematic diagram of a second embodiment of the combined cycle unit of the present invention. As shown in FIG. 5, the second embodiment is different from the first embodiment in that the interconnecting pipe 31 connects the flue gas header 22 and the chimney 27.
[0044] FIG. 6 is a schematic diagram of the operation of the non-oxygen-consuming energy storage system 30 of the second embodiment of the combined cycle unit of the present invention. As shown in FIG. 6, in terms of operation, the second embodiment is different from the first embodiment in that the gas inducing equipment 33 induces the gas in the heat recovery boiler 21 to enter the interconnecting pipe 31 through the flue gas duct 28 (see FIG. 11), the gas passes through the damper 32, the heater 34 heats up the gas in the interconnecting pipe 31, and the hot gas is forced by the gas inducing equipment 33 and enters the flue gas header 22, and then enters the interior of the heat recovery boiler 21 along the flue gas header 22.
[0045] FIG. 7 is a schematic diagram of a third embodiment of the combined cycle unit of the present invention. As shown in FIG. 7, the difference between the third embodiment and the first embodiment in that the non-oxygen-consuming energy storage system 30A may not include the damper 32 such that there is no device in the interconnecting pipe 31.
[0046] FIG. 8 is a schematic diagram of a fourth embodiment of the combined cycle unit of the present invention. As shown in FIG. 8, the fourth embodiment is different from the third embodiment in that the interconnecting pipe 31 connects the flue gas header 22 and the chimney 27.
[0047] FIG. 9 is a schematic diagram of a fifth embodiment of the combined cycle unit of the present invention. As shown in FIG. 9, the fifth embodiment is different from the first embodiment in that the top opening of the chimney 27A is not provided with a damper 271.
[0048] FIG. 10 is a schematic diagram of a sixth embodiment of the combined cycle unit of the present invention. As shown in FIG. 10, the sixth embodiment is different from the fifth embodiment in that the interconnecting pipe 31 connects the flue gas header 22 and the chimney 27.
[0049] FIG. 11 is a schematic diagram of a seventh embodiment of the combined cycle unit of the present invention. As shown in FIG. 11, in terms of structure, the seventh embodiment is different from the first embodiment in that: first, the chimney 27B is installed outside the heat recovery boiler 21 and connected to the heat recovery boiler 21 through a flue gas duct 28; second, the interconnecting pipe 31 connects the heat recovery boiler 21 and the flue gas duct 28; third, the non-oxygen-consuming energy storage system 30B includes two dampers 32 and 32A, and the damper 32A is located between the heater 34 and the heat recovery boiler 21.
[0050] FIG. 12 is a schematic diagram of the operation of the non-oxygen-consuming energy storage system 30B of the seventh embodiment of the combined cycle unit of the present invention. As shown in FIG. 12, in terms of operation, the seventh embodiment is different from the first embodiment in that the gas inducing equipment 33 induces the gas in the heat recovery boiler 21 to enter the interconnecting pipe 31 through the flue gas duct 28, the gas passes through the damper 32, the heater 34 heats up the gas in the interconnecting pipe 31, and the hot gas passes through the damper 32A and is forced by the gas inducing equipment 33 to enter the interior of the heat recovery boiler 21.
[0051] FIG. 13 is a schematic diagram of an eighth embodiment of the combined cycle unit of the present invention. As shown in FIG. 13, in terms of structure, the eighth embodiment is different from the seventh embodiment in that the interconnecting pipe 31 connects the flue gas header 22 and the flue gas duct 28.
[0052] FIG. 14 is a schematic diagram of the operation of the non-oxygen-consuming energy storage system 30B of the eighth embodiment of the combined cycle unit of the present invention. As shown in FIG. 14, in terms of operation, the eighth embodiment is different from the seventh embodiment in that the hot gas passes through the damper 32A and is forced by the gas inducing equipment 33 to enter the flue gas header 22, and then enters the interior of the heat recovery boiler 21 along the flue gas header 22.
[0053] In summary, the combined cycle unit of the present invention can circulate and heat up the gas in the heat recovery boiler 21 by the non-oxygen-consuming energy storage system 30. This energy storage mechanism, which converts electricity into heat, can utilize the excess electricity on the power grid during specific time periods to keep the pipelines and components of each unit in a hot standby condition, and therefore has the following several effects: first, when the gas turbine generator 11 is restarted under an emergency power demand on the power grid, the combined cycle unit of the present invention can rapidly ramp up its load to meet the demand on the power grid; second, the combined cycle unit of the present invention can save energy during the standby period; third, the combined cycle unit of the present invention can speed up the restarting process; fourth, the combined cycle unit of the present invention can reduce the energy consumption during the unit start-up stage; fifth, the non-oxygen-consuming energy storage systems 30, 30A, and 30B have the advantages such as easy assembly, using electricity or non-oxygen-consuming heat sources for temperature boosting, not using natural gas, lower manufacturing costs, and a smaller equipment footprint; sixth, since the non-oxygen-consuming energy storage systems 30, 30A, and 30B adopt closed circulation heating designs, the heated-up gas introduced from the chimneys 27, 27A or the flue gas duct 28 will not be discharged through the chimneys 27, 27A, and 27B, which can remain in the non-oxygen-consuming energy storage systems 30, 30A, 30B, allowing its temperature to continuously rise, thereby ensuring higher heating efficiency.
[0054] Those mentioned above are only used to explain the preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Therefore, any modifications or changes to the present invention made under the same creative spirit should still be included in the scope to be protected of the present invention.
