CN215486194U - Compressed air energy storage system coupled with thermal power plant - Google Patents
Compressed air energy storage system coupled with thermal power plant Download PDFInfo
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- CN215486194U CN215486194U CN202120484702.7U CN202120484702U CN215486194U CN 215486194 U CN215486194 U CN 215486194U CN 202120484702 U CN202120484702 U CN 202120484702U CN 215486194 U CN215486194 U CN 215486194U
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Abstract
The utility model discloses a compressed air energy storage system coupled with a thermal power plant, which comprises thermal equipment and a compressed air energy storage system of the thermal power plant: a steam outlet of thermal power equipment of the thermal power plant is connected with a steam turbine of the compressed air energy storage system; the compressed air energy storage system comprises a compressor, a steam turbine, a heat exchange system, an air storage chamber, an air expander and a generator, wherein an air inlet of the compressor is communicated with air, the steam turbine is connected with the compressor, and the steam turbine is used for driving the compressor to compress air; the air outlet of the compressor is connected with the air inlet of the air storage chamber through the heat exchange system, and the air storage chamber is used for storing compressed air; an air outlet of the air storage chamber is connected with an air inlet of an air expander through a heat exchange system, and the expander is connected with a generator; the utility model has the advantages of large adjusting range and high response speed.
Description
Technical Field
The utility model belongs to the technical field of energy storage, and particularly relates to a compressed air energy storage system coupled with a thermal power plant.
Background
In recent years, the installed capacity of new energy power generation such as wind power generation, photovoltaic power generation and the like is rapidly increased. The installed scale of new energy in partial regions far exceeds the local absorption capacity, and the problems of wind and light abandonment are serious. In order to improve the utilization rate of new energy power generation and reduce wind abandonment and light abandonment, the flexibility of a power grid in a thermal power generating unit needs to be further improved. The adjustment range of the thermal power generating unit is generally 50-100% due to the requirement of the combustion stability of the coal-fired boiler. In the current commercialized large-scale energy storage technology, only the compressed air energy storage technology can realize energy storage with high capacity, low cost and long time.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a compressed air energy storage system coupled with a thermal power plant, and aims to improve the flexibility of a conventional thermal power unit and improve the peak regulation capacity.
In order to achieve the above object, the present invention provides a compressed air energy storage system coupled to a thermal power plant, comprising thermal power plant equipment and a compressed air energy storage system:
the compressed air energy storage system comprises a compressor, a steam turbine, a heat exchange system, an air storage chamber, an air expander and a generator, wherein an air inlet of the compressor is communicated with air, the steam turbine is connected with the compressor, and the steam turbine is used for driving the compressor to compress air; the air outlet of the compressor is connected with the air inlet of the air storage chamber through the heat exchange system, and the air storage chamber is used for storing compressed air; an air outlet of the air storage chamber is connected with an air inlet of the air expander through a heat exchange system, and the expander is connected with a generator; and a steam outlet of the thermal power plant thermal equipment is connected with a steam turbine of the compressed air energy storage system.
Further, the compressor is multistage compressor, sets up heat transfer heat-retaining system and retrieves compression heat after every level compression, and the compressor that adjacent setting passes through heat transfer system and connects, heat transfer system's cooling medium import and the condensate outlet of condensate tank are connected, heat transfer system's cooling medium export and the access connection of oxygen-eliminating device, heat transfer system is used for retrieving the compression heat that compression process produced.
Furthermore, the cooling working medium adopted by the heat exchange system is condensed water of the thermal power plant, and the temperature of the condensed water after heat exchange is increased and enters a deaerator of the thermal power plant.
Furthermore, the air expansion machine is set to be a multi-stage air expansion machine, the air expansion machines which are adjacently arranged are connected through a heat exchange system, a heating working medium inlet of the heat exchange system is connected with an air suction opening of the high-pressure heater, a heating working medium outlet of the heat exchange system is connected with an inlet of the deaerator, and the heat exchange system is used for heating compressed air in the air storage chamber.
Further, the adjacent air expanders are connected to the same generator; and the heating working medium of the heat exchanger adopts a high-pressure heater of a steam turbine of the thermal power plant to extract steam, and the heat-exchanged heating working medium is introduced into a deaerator of the thermal power plant.
Further, when the steam turbine is a condensing steam turbine, a waste steam outlet of the steam turbine is connected with an air inlet of a condenser; when the steam turbine is a back pressure steam turbine, a dead steam outlet of the steam turbine is connected with a gas supply pipe network.
Further, the steam output from the steam outlet of the thermal power plant may be main steam of a boiler, reheat steam of the boiler, or extracted steam of a high-pressure heater.
Further, the gas storage chamber is a waste mine hole, a salt cavern, an underground cave or a ground gas storage tank group.
Furthermore, the compressed air energy storage system coupled with the thermal power plant can enable the adjusting range of the thermal power plant to reach 10% -100%.
When the compressed air energy storage system is in deep peak shaving, thermodynamic equipment of the thermal power plant introduces steam into a steam turbine to do work, and exhausted steam after doing work is discharged into a condenser; air enters the compressor from an air inlet of the compressor, the compressor is driven by the steam turbine to compress the air to obtain high-temperature compressed air, the compressor is connected with the air storage chamber through a heat exchange system, a cooling working medium inlet of the heat exchange system is connected with an outlet of the condensation water tank, low-temperature condensed water in the condensation water tank is introduced into the heat exchange system, the high-temperature compressed air and the low-temperature condensed water in the heat exchange system exchange heat, the compressed air after heat exchange is introduced into the air storage chamber to be stored, and the condensed water after heat exchange is introduced into the oxygen remover; when the peak generates electricity, high-pressure air in the air storage chamber is introduced into the heat exchange system, a heating working medium inlet of the heat exchange system is connected with a steam extraction port of the high-pressure heater, high-temperature steam is introduced into the heat exchange system, compressed air and the high-temperature steam exchange heat in the heat exchange system, condensed water after the heat of the steam is released is introduced into the deaerator, the compressed air after the temperature is increased is introduced into the air expander, and the air expander does work to drive the generator to generate electricity.
Compared with the prior art, the compressed air energy storage system has the advantages of large installed capacity, low construction and operation cost and long operation time, the compressed air energy storage system is coupled with a thermal power plant thermodynamic system, large-scale energy storage with high efficiency and low cost can be realized, the flexibility of a thermal power unit is greatly improved by coupling the compressed air energy storage system, and the compressed air energy storage system is applied to the thermal power plant, so that the flexibility of the thermal power plant is improved.
The heat exchange system in the compressed air energy storage system cools the compressed air and recovers the compression heat, the existing condensed water system of the thermal power plant is adopted to cool the compressed air, and the recovered compression heat enters the existing deaerator of the thermal power plant through the condensed water, so that the utilization of the compression heat is realized.
According to the utility model, the compressed air energy storage system is coupled with the thermal power plant, so that the flexibility and the peak regulation capability of the conventional thermal power unit are obviously improved, the regulation range of the thermal power unit can be increased from 50-100% to 10-100%, when the thermal power unit participates in the peak regulation of a power grid, higher peak regulation income can be obtained, the flexibility of the thermal power unit is improved, the flexibility refers to the load change range of the thermal power unit, the larger the change range is, the better the flexibility is, and when the thermal power unit participates in the peak regulation of the power grid, the higher peak regulation income can be obtained.
Drawings
FIG. 1 is a schematic diagram of a preferred compressed air energy storage system coupled to a thermal power plant.
In the drawings: 1 is a compressor; 2 is a steam turbine; 3 is the boiler reheater outlet; 4 is a condenser; 5 is a heat exchange system; 6 is a condensation water tank; 7 is a deaerator; 8 is a steam extraction port of the high-pressure heater; 9 is an air storage chamber; 10 is an air expander; the generator 11 is a generator.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some embodiments of the utility model are shown.
Fig. 1 is a schematic composition diagram of a preferred embodiment of a compressed air energy storage system coupled to a thermal power plant, which includes thermal equipment of the thermal power plant and the compressed air energy storage system, wherein the compressed air energy storage system includes a compressor 1, a steam turbine 2, a heat exchange system 5, an air storage chamber 9, an air expander 10, and a generator 11; the thermal power plant comprises a boiler reheater outlet 3, a condenser 4, a condensation water tank 6, a deaerator 7 and a high-pressure heater steam extraction port 8.
The compressor 1 can be provided with a multi-stage compressor according to actual needs; the air expander 10 can be provided with a plurality of stages of air expanders according to actual needs; in the preferred embodiment of the utility model, the number of stages of the multistage compressor is 2-8, and a heat exchange and heat storage system is arranged after each stage of compression to recover compression heat, so that the efficiency is improved. In another preferred embodiment of the utility model, a heat exchange system is arranged between stages of the multistage expansion machine to heat the compressed air entering the compressor, so that the power generation efficiency is improved; the number of stages of the multistage expander is 2-4.
In the example, the outlet 3 of the boiler reheater is connected with a turbine 2 of a compressed air energy storage system, an air inlet of a compressor 1 is communicated with air, the turbine 2 is connected with the compressor 1, and the turbine 2 drives the compressor 1 to compress air; an air outlet of the compressor 1 is connected with an air inlet of an air storage chamber through a hot side of the heat exchange system 5, and the air storage chamber 9 is used for storing compressed air; an air outlet of the air storage chamber 9 is connected with an air inlet of an air expander 10 through a cold side of the heat exchange system 5, and the air expander 10 is connected with a generator 11 to drive the generator 11 to generate electricity.
In the embodiment, two stages of compressors are arranged, the two stages of compressors are connected through the hot side of a heat exchange system, a compressed air outlet of the last stage of compressor 1 is connected with a hot side inlet of the heat exchange system 5, a hot side outlet of the heat exchange system 5 is connected with a gas storage chamber 5 through a pipeline, a cooling working medium inlet of the heat exchange system 5 is connected with a condensed water outlet of a condensed water tank 6, and a cooling working medium outlet of the heat exchange system 5 is connected with an inlet of a deaerator 7; the cooling working medium adopted by the heat exchange system 5 is condensed water of a thermal power plant, and the cooling working medium after heat exchange is introduced into a deaerator 7 of the thermal power plant; the liquid water in the deaerator enters a boiler in a thermal power plant to be heated into steam.
In the embodiment, two stages of air expanders are arranged, the two stages of air expanders are connected through the cold side of the heat exchange system 5, a compressed air outlet of the air storage chamber 9 is connected with a cold side inlet of the heat exchange system 5 through a pipeline, and a cold side outlet of the heat exchange system 5 is connected with a compressed air inlet of the first stage of air expander;
furthermore, the two-stage air expansion machines are connected to the same generator, the heating working medium of the heat exchange system 5 adopts a high-pressure heater of a steam turbine of the thermal power plant to extract steam, and the heating working medium after heat exchange is introduced into a deaerator 7 of the thermal power plant.
In this example, the steam turbine 2 is a condensing steam turbine, and a waste steam outlet of the steam turbine is connected with an air inlet of the condenser 4.
The steam turbine 2 can also be a back pressure steam turbine, and when the back pressure steam turbine is adopted, a waste steam outlet of the steam turbine is connected with a gas supply pipe network.
In the example, the thermal power plant uses the reheat steam of the boiler to drive the steam turbine 2, and the steam can also be the main steam of the boiler or the extraction steam of the high-pressure heater.
Preferably, the gas storage chamber is a waste mine hole, a salt cavern, an underground cave or a ground gas storage tank group.
A compressed air energy storage system coupled with a thermal power plant is characterized in that when energy storage and peak load regulation are carried out, redundant partial reheated steam is introduced into a steam turbine 2 of the compressed air energy storage system from an outlet 3 of a boiler reheater to do work, the steam turbine 2 drives a two-stage compressor to compress air, high-temperature compressed air obtained after compression is introduced into a hot side of a heat exchange system 5, condensed water of the thermal power plant is introduced into a condensed water tank 6, low-temperature condensed water in the condensed water tank 6 enters a cold side of the heat exchange system 5 under the driving of a condensed water pump, high-temperature compressed air and low-temperature condensed water of the thermal power plant exchange heat, the compressed air after heat exchange is introduced into a gas storage chamber to be stored, and the condensed water after heat exchange enters a deaerator 7 of the thermal power plant; partial reheated steam is introduced into the steam turbine 2 to do work to drive the compressor 1 to compress air, so that the steam quantity entering a power generation steam turbine of a thermal power plant is reduced, the power generation power of a generator can be reduced, and energy storage peak regulation is realized.
When the power is generated at a peak, high-pressure air in the air storage chamber 9 is introduced into a cold side of the heat exchange system 5, part of steam is introduced from a steam extraction port 8 of the high-pressure heater to enter a hot side of the heat exchange system 5, high-temperature steam exchanges heat with compressed air, the heat exchange system 5 is arranged at an inlet 10 of each stage of air expander, water after the steam releases heat and is condensed enters a deaerator 7 of a thermal power plant, and the heated compressed air enters two stages of air expanders to expand to do work to drive a generator 11 to generate power; the air expander 10 drives the generator 11 to generate electricity, and the generated power of the thermal power plant is increased.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the utility model as defined by the claims.
Claims (9)
1. A compressed air energy storage system coupled with a thermal power plant, comprising thermal power plant thermal equipment and a compressed air energy storage system:
the compressed air energy storage system comprises a compressor (1), a steam turbine (2), a heat exchange system (5), an air storage chamber (9), an air expander (10) and a generator (11), wherein an air inlet of the compressor (1) is communicated with air, the steam turbine (2) is connected with the compressor (1), and the steam turbine (2) is used for driving the compressor to compress air; an air outlet of the compressor (1) is connected with an air inlet of an air storage chamber through a heat exchange system (5), and the air storage chamber (9) is used for storing compressed air; an air outlet of the air storage chamber (9) is connected with an air inlet of the air expander (10) through a heat exchange system (5), and the air expander (10) is connected with a generator (11); and a steam outlet of the thermal power plant thermal equipment is connected with a steam turbine (2) of the compressed air energy storage system.
2. The compressed air energy storage system coupled with the thermal power plant as claimed in claim 1, wherein the compressor (1) is a multi-stage compressor, a heat exchange and heat storage system is arranged after each stage of compression to recover compression heat, the adjacently arranged compressors (1) are connected through a heat exchange system (5), a cooling working medium inlet of the heat exchange system (5) is connected with a condensed water outlet of a condensed water tank (6), a cooling working medium outlet of the heat exchange system (5) is connected with an inlet of a deaerator (7), and the heat exchange system (5) is used for recovering the compression heat generated in the compression process.
3. The compressed air energy storage system coupled with the thermal power plant as claimed in claim 2, wherein the cooling medium adopted by the heat exchange system (5) is condensed water of the thermal power plant, and the temperature of the condensed water after heat exchange is increased and enters a deaerator (7) of the thermal power plant.
4. The compressed air energy storage system coupled with the thermal power plant as claimed in claim 1, wherein the air expanders (10) are arranged as multi-stage air expanders, the adjacently arranged air expanders (10) are connected through a heat exchange system (5), a heating working medium inlet of the heat exchange system (5) is connected with a suction opening (8) of a high-pressure heater, a heating working medium outlet of the heat exchange system (5) is connected with an inlet of a deaerator (7), and the heat exchange system (5) is used for heating compressed air in an air storage chamber.
5. A compressed air energy storage system coupled to a thermal power plant according to claim 4, characterized in that said adjacent air expanders (10) are connected to the same generator; and the heating working medium of the heat exchange system (5) adopts a high-pressure heater of a steam turbine of the thermal power plant to extract steam, and the heat-exchanged heating working medium is introduced into a deaerator (7) of the thermal power plant.
6. A compressed air energy storage system coupled with a thermal power plant according to claim 1, characterized in that when the steam turbine (2) is a condensing steam turbine, the exhaust steam outlet of the steam turbine (2) is connected with the air inlet of a condenser (4); when the steam turbine (2) is a back pressure steam turbine, a steam exhaust outlet of the steam turbine (2) is connected with a gas supply pipe network.
7. A compressed air energy storage system coupled with a thermal power plant according to claim 1, wherein the steam output from the steam outlet of the thermal equipment of the thermal power plant can be main steam of a boiler, reheat steam of the boiler or extraction steam of a high-pressure heater.
8. A compressed air energy storage system coupled to a thermal power plant according to claim 1, characterized in that the gas storage chamber (9) is a waste mine, salt cavern, underground cavern or ground gas storage tank group.
9. A compressed air energy storage system coupled with a thermal power plant according to claim 1, wherein the compressed air energy storage system coupled with the thermal power plant can achieve a regulation range of the thermal power plant of 10% to 100%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412585A (en) * | 2022-03-11 | 2022-04-29 | 西安热工研究院有限公司 | Steam-carbon dioxide coupled power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412585A (en) * | 2022-03-11 | 2022-04-29 | 西安热工研究院有限公司 | Steam-carbon dioxide coupled power generation system |
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