Compressed air energy storage system

Abstract

The invention relates to the technical field of compressed air energy storage. The invention provides a compressed air energy storage system which is provided with a compression module, a compressor with an air inlet and a compressed air outlet and a motor for driving the compressor to operate. The water storage heat exchanger is provided with a high-temperature and high-pressure gas inlet, the high-temperature and high-pressure gas inlet communicates with the compressed gas outlet through a first gas feeding pipe, and a first control valve is arranged in the first gas feeding pipe; the gas storage is communicated with the water storage heat exchanger; and the acting module comprises a first turbine communicated with the water storage heat exchanger and a first generator connected with the output end of the first turbine, and comprises an initial starting air recovery module, and when the compressor is initially started, the initial starting air recovery module is communicated with the compressed gas outlet, and the first control valve is closed. According to the compressed air energy storage system, low-temperature and low-pressure gas exhausted during initial starting of the compressor is recycled through the coupling initial starting air recycling module, and the energy utilization rate of the compressed air energy storage system is greatly increased.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a compressed air energy storage system. Background Art

[0002] The existing compressed air energy storage system includes compressors, turbines and other devices. The compressor must be started every day. At the initial startup, the small flow air pressure ratio and exhaust temperature gradually increase. However, during the initial startup, the heat storage temperature of the gas generated by the compressor does not meet the standard, resulting in the main turbine being unable to operate normally. Usually, the gas with insufficient temperature and pressure is directly discharged, which results in a large part of the energy being directly wasted during the initial startup of the compressed air energy storage system, reducing the energy utilization rate of the system. Summary of the invention

[0003] In response to the above problems, the present invention provides a compressed air energy storage system, which recycles the low-temperature and low-pressure gas discharged when the compressor is initially started by coupling with an initial start-up air recovery module, thereby greatly improving the energy utilization rate of the compressed air energy storage system.

[0004] The present invention provides a compressed air energy storage system, which has a compression module, including a compressor with an air inlet and a compressed gas outlet, and an electric motor that drives the compressor to operate; a water storage heat exchanger, which has a high-temperature and high-pressure gas inlet, and the high-temperature and high-pressure gas inlet is connected to the compressed gas outlet through a first air supply pipe, and a first control valve is provided in the first air supply pipe; an air storage reservoir is connected to the water storage heat exchanger; a working module, including a first turbine connected to the water storage heat exchanger and a first generator connected to the output end of the first turbine, including: an initial start-up air recovery module, when the compressor is initially started, the initial start-up air recovery module is connected to the compressed gas outlet, and the first control valve is closed.

[0005] According to the above technical solution, by setting up an initial startup air recovery module and connecting it when the compressor is initially started, the recycling of low-temperature and low-pressure gas is achieved, effectively improving energy utilization.

[0006] In the compressed air energy storage system of the optional technical solution of the present invention, the initial start-up air recovery module includes a second turbine having a second turbine inlet and a second generator connected to the output end of the second turbine, the second turbine inlet is connected to the compressed gas outlet through a first air pipe, and a first initial start-up control valve is provided in the first air pipe.

[0007] According to the above preferred technical solution, by providing the second turbine and the second generator, the low-temperature and low-pressure gas generated when the compressor is initially started can be directly used to generate power, thereby improving energy utilization. Moreover, by generating a portion of electric energy, the overall power consumption of the system can be reduced.

[0008] In the compressed air energy storage system of the optional technical solution of the present invention, the second generator is electrically connected to the electric motor.

[0009] According to the above preferred technical solution, part of the electric energy is directly provided to the motor through the second generator, thereby improving the effective utilization rate of energy.

[0010] In the compressed air energy storage system of the optional technical solution of the present invention, the second turbine can operate in sliding pressure.

[0011] According to the above preferred technical solution, the throttling loss can be reduced and the operating efficiency can be improved through the sliding pressure operation mode.

[0012] In the compressed air energy storage system of the optional technical solution of the present invention, the initial start-up air recovery module includes a third turbine having a third turbine inlet, the third turbine is connected to the first turbine through a coupling to form a multi-stage turbine, the third turbine inlet is connected to the compressed gas outlet through a second air pipe, and a second initial start-up control valve is provided in the second air pipe.

[0013] According to the above preferred technical scheme, a multi-stage turbine is formed by the first turbine and the third turbine through a coupling, and the low-temperature and low-pressure gas generated when the compressor is initially started is introduced into the third turbine of the low-pressure level, so that the low-temperature and low-pressure gas is recycled and utilized, thereby effectively improving the energy utilization rate.

[0014] In the compressed air energy storage system of the optional technical solution of the present invention, the initial startup air recovery module includes a low-temperature heat storage unit and a gas storage unit which are connected to the compressed gas outlet in sequence, the low-temperature heat storage unit stores low-temperature heat, and the gas storage unit stores gas after the low-temperature heat is absorbed, the compressed gas outlet and the low-temperature heat storage unit are connected through a third gas pipeline, and a third initial startup control valve is provided in the third gas pipeline.

[0015] According to the above preferred technical scheme, low-temperature heat is absorbed and stored by the low-temperature heat storage unit, and gas is stored by the gas storage unit, thereby realizing the recovery and storage of the low-temperature and low-pressure gas generated when the compressor is initially started, facilitating subsequent specific use and effectively improving energy utilization.

[0016] In the compressed air energy storage system of the optional technical solution of the present invention, a gas-liquid separator is also provided between the water storage heat exchanger and the gas storage reservoir.

[0017] According to the above preferred technical solution, the water in the gas entering the gas storage reservoir can be removed by the gas-liquid separator, thereby preventing the liquid from corroding or damaging the gas storage reservoir and extending its service life.

[0018] In the compressed air energy storage system of the optional technical solution of the present invention, the water storage heat exchanger also has a low-temperature and high-pressure gas outlet, a low-temperature and high-pressure gas inlet and a high-temperature and high-pressure gas outlet, the gas-liquid separator has a separation inlet and a separation outlet, the separation inlet is connected to the low-temperature and high-pressure gas outlet through a second air supply pipe, a second control valve is provided in the second air supply pipe, the gas storage reservoir has a gas storage inlet and a gas storage outlet, the separation outlet is connected to the gas storage inlet through the gas storage pipe, the gas storage outlet is connected to the low-temperature and high-pressure gas inlet through a third air supply pipe, and a third control valve is provided in the third air supply pipe.

[0019] According to the above preferred technical solution, the high-temperature and high-pressure gas generated by the compressor is heat exchanged through the water storage heat exchanger and stored in the gas storage reservoir after gas-liquid separation, so that the corresponding gas can be stored when the power consumption is at a low state and energy storage is required. When the power consumption is at a peak state, the low-temperature and high-pressure gas in the gas storage reservoir is directly released to pass through the water storage heat exchanger to form high-temperature and high-pressure gas, and enter the first turbine to work and drive the first generator to generate electricity for power supply, which can make the system run stably and achieve reliable energy supply.

[0020] In the compressed air energy storage system of the optional technical solution of the present invention, the first turbine inlet is connected to the high-temperature and high-pressure gas outlet through a fourth air supply pipe, and a fourth control valve is provided in the fourth air supply pipe.

[0021] According to the above preferred technical solution, the flow rate of the high-temperature and high-pressure gas entering the first turbine can be controlled by the fourth control valve, thereby avoiding the turbine overload caused by excessive gas flow rate, or the energy conversion efficiency affected by too small gas flow rate, so that the turbine can perform energy conversion more effectively during operation. At the same time, by controlling the gas flow rate to be stable, the turbine can operate safely and stably.

[0022] In the compressed air energy storage system of the optional technical solution of the present invention, an air filter is provided at the air inlet.

[0023] According to the above preferred technical solution, the operating stability and service life of the compressed air energy storage system can be improved by filtering impurities in the atmosphere through an air filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the compressed air energy storage system in the first embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the structure of the compressed air energy storage system in the second embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the compressed air energy storage system in the third embodiment of the present invention.

[0027] Figure numerals: compressed air energy storage system 100, compressor 10, electric motor 20, air filter 11, water storage heat exchanger 30, gas-liquid separator 40, gas storage reservoir 50, first turbine 60, first generator 70, first air supply pipe 12, first control valve 121, second air supply pipe 31, second control valve 311, third air supply pipe 51, third control valve 511, fourth air supply pipe 32, fourth control valve 321, gas storage pipe 41, second turbine 81, second generator 82, first gas pipeline 13, first initial start-up control valve 131, third turbine 83, second gas pipeline 14, second initial start-up control valve 141, low-temperature heat storage unit 84, gas storage unit 85, third gas pipeline 15, third initial start-up control valve 151. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] <Example 1>

[0030] Figure 1 Schematic diagram of the structure of the compressed air energy storage system in the first embodiment of the present invention.

[0031] like Figure 1 As shown, the compressed air energy storage system 100 of this embodiment comprises a compression module, a water storage heat exchanger 30, a gas-liquid separator 40, an air storage reservoir 50, a work module and an initial start-up air recovery module.

[0032] The compression module includes a compressor 10 having an air inlet and a compressed gas outlet, and a motor 20 driving the compressor 10 to operate.

[0033] The water storage heat exchanger 30 has a high-temperature and high-pressure gas inlet, which is connected to the compressed gas outlet via a first air supply pipe 12 , in which a first control valve 121 is provided.

[0034] The gas storage reservoir 50 is in communication with the water storage heat exchanger 30 .

[0035] The power module includes a first turbine 60 communicating with the water storage heat exchanger 30 and a first generator 70 connected to an output end of the first turbine 60 .

[0036] When the compressor 10 is initially started, the initial start-up air recovery module is connected to the compressed gas outlet, and the first control valve 121 is closed.

[0037] By providing an initial startup air recovery module and connecting it when the compressor 10 is initially started, the low-temperature and low-pressure gas generated by the initial startup of the compressor 10 can be recovered and utilized, thereby effectively improving energy utilization.

[0038] In this embodiment, the compressor 10 may be a multi-stage air compressor, with inter-compression heat exchangers arranged between the stages.

[0039] A gas-liquid separator 40 is also provided between the water storage heat exchanger 30 and the gas storage reservoir 50. The gas-liquid separator 40 can remove moisture from the gas entering the gas storage reservoir 50, thereby preventing the liquid from corroding or damaging the gas storage reservoir 50 and extending its service life.

[0040] The water storage heat exchanger 30 also has a low-temperature high-pressure gas outlet, a low-temperature high-pressure gas inlet, and a high-temperature high-pressure gas outlet.

[0041] The gas-liquid separator 40 has a separation inlet and a separation outlet. The separation inlet is connected to the low-temperature high-pressure gas outlet through a second air supply pipe 31 . A second control valve 311 is provided in the second air supply pipe 31 .

[0042] The gas storage reservoir 50 has a gas storage inlet and a gas storage outlet. The separation outlet is connected to the gas storage inlet through a gas storage pipe 41. The gas storage outlet is connected to the low-temperature high-pressure gas inlet through a third gas supply pipe 51. A third control valve 511 is provided in the third gas supply pipe 51.

[0043] When power consumption is at a low point and energy storage is required, the high-temperature and high-pressure gas generated by the compressor 10 can be heat exchanged by the water storage heat exchanger 30 to obtain low-temperature and high-pressure gas, which is then stored in the gas storage reservoir 50 after gas-liquid separation.

[0044] When electricity consumption is at its peak and energy needs to be released, the low-temperature and high-pressure gas in the gas storage reservoir 50 can be directly released, passed through the water storage heat exchanger 30 to form high-temperature and high-pressure gas, and enter the first turbine 60 to perform work to drive the first generator 70 to generate electricity for power supply, which can make the system run stably and achieve reliable energy supply.

[0045] Furthermore, the heat exchange medium in the water storage heat exchanger 30 is water, and the number and size of the water storage heat exchanger 30 can be increased according to actual needs.

[0046] Furthermore, the size of the gas storage 50 can be determined according to actual needs.

[0047] The first turbine inlet is connected to the high-temperature and high-pressure gas outlet through the fourth air supply pipe 32, and the fourth air supply pipe 32 is provided with a fourth control valve 321. The fourth control valve 321 can control the flow of the high-temperature and high-pressure gas entering the first turbine 60 according to the design specifications of the first turbine 60, thereby avoiding the turbine overload caused by excessive gas flow or the energy conversion efficiency affected by too small gas flow, and enabling the turbine to perform energy conversion more effectively during operation. At the same time, by controlling the gas flow to be stable, the turbine can operate safely and stably.

[0048] In this embodiment, the first turbine 60 is a high-pressure turbine that can receive high-temperature and high-pressure gas to perform work. Further, the rotating shaft of the first turbine 60 is connected to the input shaft of the first generator 70, and the turbine work of the first turbine 60 can correspondingly drive the first generator 70 to generate electricity.

[0049] The air recovery module includes a second turbine 81 having a second turbine inlet and a second generator 82 connected to the output end of the second turbine 81. The second turbine inlet is connected to the compressed gas outlet through a first air pipe 13. The first air pipe 13 is provided with a first initial start-up control valve 131.

[0050] In this embodiment, in extreme situations such as special demand supply and protection, the second turbine 81 and the second generator 82 can be used alone for turbine power generation by initially starting the air recovery module, thereby ensuring emergency energy supply.

[0051] The second turbine 81 can operate in sliding pressure mode, which can reduce throttling losses and improve operating efficiency.

[0052] In this embodiment, the second turbine 81 is a low-pressure turbine that can receive low-temperature and low-pressure gas to perform work. Further, the rotating shaft of the second turbine 81 is connected to the input shaft of the second generator 82, and the turbine work of the second turbine 81 can correspondingly drive the second generator 82 to generate electricity.

[0053] Furthermore, the rotating shaft of the compressor 10 is connected to the output shaft of the motor 20, and the compressor 10 is driven by the motor 20 to compress air. The second generator 82 is electrically connected to the motor 20, and can provide part of the electric energy for the motor 20 or transmit it to the power grid, which greatly improves the power generation efficiency of the unit and improves the effective utilization rate of energy.

[0054] The working process of the compressed air energy storage system 100 in this embodiment is as follows:

[0055] When the compressed air energy storage system 100 is initially started, the motor 20 starts and drives the compressor 10 to start working. The air from the atmosphere is introduced into the compressor 10 after being filtered of impurities by the air filter 11. The small flow air pressure ratio and exhaust temperature of the compressor 10 gradually increase, but the gas heat storage temperature during the initial startup process does not meet the standard. At this time, the first initial startup control valve 131 in the initial startup air recovery module is opened, and the first control valve 121 is closed. The low-temperature and low-pressure gas generated during the initial startup process enters the second turbine 81 that can operate at sliding pressure. The second turbine 81 works and drives the second generator 82 to generate electricity. The second generator 82 is electrically connected to the motor 20, which can provide part of the electric energy for the motor 20 or transmit it to the power grid, which greatly improves the power generation efficiency of the unit and improves the full utilization rate of energy.

[0056] After the compressor 10 goes through the initial startup phase, the air passes through the compressor 10 and becomes high-temperature and high-pressure gas that meets the heat storage requirements. When energy storage is required in the low-power state, the first initial startup control valve 131 is closed, while the first control valve 121 and the second control valve 311 are opened, and the third control valve 511 and the fourth control valve 321 are closed. The high-temperature and high-pressure gas enters the water storage heat exchanger 30 through the first air supply pipe 12 for heat exchange, and generates low-temperature and high-pressure gas after the heat exchange is completed. The low-temperature and high-pressure gas enters the gas-liquid separator 40 through the second air supply pipe 31, and enters the gas storage reservoir 50 through the gas storage pipe 41 for storage after gas-liquid separation in the gas-liquid separator 40.

[0057] When the power consumption is at a peak and energy needs to be released, the third control valve 511 and the fourth control valve 321 are opened. Low-temperature and high-pressure gas is released from the gas storage 50 and transported to the water storage heat exchanger 30 through the third air delivery pipe 51 for heat exchange. After heat exchange with the medium in the water storage heat exchanger 30, the low-temperature and high-pressure gas becomes high-temperature and high-pressure gas that meets the turbine requirements. The high-temperature and high-pressure gas enters the first turbine 60 through the fourth air delivery pipe 32 to perform work, drive the first generator 70 to generate electricity, release electricity to meet the needs of the peak power consumption state, and close the third control valve 511 and the fourth control valve 321 after the energy release is completed.

[0058] <Example 2>

[0059] Figure 2 Schematic diagram of the structure of the compressed air energy storage system in the second embodiment of the present invention.

[0060] like Figure 2 As shown, the compressed air energy storage system of this embodiment has a compression module, a water storage heat exchanger 30, a gas-liquid separator 40, an air storage reservoir 50, a working module and an initial start-up air recovery module, wherein the specific settings of the compression module, the water storage heat exchanger 30, the gas-liquid separator 40, the air storage reservoir 50 and the working module are the same as those in Example 1.

[0061] In this embodiment, the initial start-up air recovery module includes a third turbine 83 having a third turbine inlet. The third turbine 83 is connected to the first turbine 60 through a coupling to form a multi-stage turbine. The third turbine inlet is connected to the compressed gas outlet through a second air pipe 14. A second initial start-up control valve 141 is provided in the second air pipe 14.

[0062] In this embodiment, the third turbine 83 is a low-pressure turbine. The first turbine 60 and the third turbine 83 form a multi-stage turbine through a coupling, and the low-temperature and low-pressure gas generated when the compressor 10 is initially started is correspondingly passed to the third turbine 83 of the low-pressure level, which effectively improves the energy utilization rate.

[0063] In some embodiments, the first turbine 60 may be a turbine with a multi-stage turbine, and each stage of the turbine is separated by a coupling, so that a low-pressure turbine area and a high-pressure turbine area are formed in the first turbine 60. The low-pressure turbine area is connected to the compressed gas outlet through the second gas delivery pipe 14, and the high-pressure turbine area is connected to the high-temperature and high-pressure gas outlet of the water storage heat exchanger 30 through the fourth gas delivery pipe 32. The low-temperature and low-pressure gas generated by the initial startup of the compressor 10 is passed into the low-pressure turbine area for action, and the high-temperature and high-pressure gas is passed into the high-pressure turbine area for action, which also realizes the effective utilization of energy.

[0064] Furthermore, since the power of the motor 20 used by the compressor 10 is relatively small, a plurality of motors 20 are generally provided in actual use to operate in parallel with the plurality of compressors 10. In the above case, the plurality of compressors 10 can be connected to the low-pressure turbine area of ​​the first turbine 60 having a multi-stage turbine through the second gas transmission pipe 14. The low-temperature and low-pressure gas generated by the plurality of compressors 10 at the initial start-up stage can be gathered to form a larger gas flow, which can more effectively enable the first turbine 60 having a multi-stage turbine to perform turbine power generation.

[0065] The working process of the compressed air energy storage system in this embodiment is as follows:

[0066] When the compressor 10 is initially started, the second initial start control valve 141 is opened and the first control valve 121 is closed. The low temperature and low pressure gas generated during the initial start-up enters the third turbine 83, and the third turbine 83 performs work, driving the first generator 70 to generate electricity through the coupling.

[0067] After the compressor 10 goes through the initial startup phase, the air passes through the compressor 10 and becomes high-temperature and high-pressure gas that meets the heat storage requirements. When energy storage is required in the low-power state, the second initial startup control valve 141 is closed, and the first control valve 121 and the second control valve 311 are opened. The high-temperature and high-pressure gas generated by the compressor 10 is heat exchanged by the water storage heat exchanger 30 to form low-temperature and high-pressure gas, and is stored in the gas storage reservoir 50 after gas-liquid separation by the gas-liquid separator 40.

[0068] When the power consumption is at a peak and energy needs to be released, the third control valve 511 and the fourth control valve 321 are opened, and the low-temperature and high-pressure gas is released from the gas storage reservoir 50, and is heat-exchanged through the water storage heat exchanger 30 to become high-temperature and high-pressure gas that meets the turbine requirements. The high-temperature and high-pressure gas enters the first turbine 60 to perform work, driving the first generator 70 to generate electricity, releasing electrical energy to meet the needs of the peak power consumption state, and the third control valve 511 and the fourth control valve 321 are closed after the energy release is completed.

[0069] <Example 3>

[0070] Figure 3 Schematic diagram of the structure of the compressed air energy storage system in the third embodiment of the present invention.

[0071] like Figure 3 As shown, the compressed air energy storage system of this embodiment has a compression module, a water storage heat exchanger 30, a gas-liquid separator 40, an air storage reservoir 50, a working module and an initial start-up air recovery module, wherein the specific configuration of the compression module, the water storage heat exchanger 30, the gas-liquid separator 40, the air storage reservoir 50 and the working module is the same as that of the first embodiment.

[0072] In this embodiment, the initial start-up air recovery module includes a low-temperature heat storage unit 84 and a gas storage unit 85 which are sequentially connected to the compressed gas outlet, the low-temperature heat storage unit 84 stores low-temperature heat, and the gas storage unit 85 stores gas after the low-temperature heat is absorbed. The compressed gas outlet and the low-temperature heat storage unit 84 are connected through a third gas pipeline 15, and a third initial start-up control valve 151 is provided in the third gas pipeline 15.

[0073] Specifically, the low-temperature heat stored in the low-temperature heat storage unit 84 can be used for the later startup and cylinder warming of the steam turbine, and the gas stored in the gas storage unit 85 can be used for the gas sealing of the steam turbine.

[0074] The working process of the compressed air energy storage system 100 in this embodiment is as follows:

[0075] When the compressor 10 is initially started, the third initial start control valve 151 is opened and the first control valve 121 is closed. The low-temperature and low-pressure gas generated during the initial start-up first enters the low-temperature heat storage unit 84 through the third gas transmission pipe 15, and the low-temperature heat storage unit 84 absorbs heat to collect and store low-temperature heat. The gas after the low-temperature heat is collected enters the gas storage unit 85 for storage.

[0076] After the compressor 10 goes through the initial startup phase, the air passes through the compressor 10 to become high-temperature and high-pressure gas that meets the heat storage requirements. When energy storage is required in the low-power state, the third initial startup control valve 151 is closed, and the first control valve 121 and the second control valve 311 are opened. The high-temperature and high-pressure gas generated by the compressor 10 is heat exchanged by the water storage heat exchanger 30 to form low-temperature and high-pressure gas, and is stored in the gas storage reservoir 50 after gas-liquid separation by the gas-liquid separator 40.

[0077] When the power consumption is at a peak and energy needs to be released, the third control valve 511 and the fourth control valve 321 are opened, and the low-temperature and high-pressure gas is released from the gas storage reservoir 50, and is heat-exchanged through the water storage heat exchanger 30 to become high-temperature and high-pressure gas that meets the turbine requirements. The high-temperature and high-pressure gas enters the first turbine 60 to perform work, driving the first generator 70 to generate electricity, releasing electrical energy to meet the needs of the peak power consumption state, and the third control valve 511 and the fourth control valve 321 are closed after the energy release is completed.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressed air energy storage system having a compression module, comprising a compressor having an air inlet and a compressed gas outlet, and an electric motor driving the compressor to operate; The water storage heat exchanger has a high-temperature and high-pressure gas inlet, the high-temperature and high-pressure gas inlet is connected to the compressed gas outlet through a first air supply pipe, and a first control valve is provided in the first air supply pipe; a gas storage reservoir, connected to the water storage heat exchanger; A working module, comprising a first turbine connected to the water storage heat exchanger and a first generator connected to the output end of the first turbine, characterized in that: include: Initial startup air recovery module: when the compressor is initially started, the initial startup air recovery module is connected to the compressed gas outlet, and the first control valve is closed.

2. The compressed air energy storage system according to claim 1, characterized in that: The initial start-up air recovery module includes a second turbine having a second turbine inlet and a second generator connected to an output end of the second turbine. The second turbine inlet is connected to the compressed gas outlet through a first gas pipeline, and a first initial start-up control valve is provided in the first gas pipeline.

3. The compressed air energy storage system according to claim 2, characterized in that: The second generator is electrically connected to the motor.

4. The compressed air energy storage system according to claim 2, characterized in that: The second turbine can be operated with sliding pressure.

5. The compressed air energy storage system according to claim 1, characterized in that: The initial start-up air recovery module includes a third turbine having a third turbine inlet. The third turbine is connected to the first turbine via a coupling to form a multi-stage turbine. The third turbine inlet is connected to the compressed gas outlet via a second air pipe. A second initial start-up control valve is provided in the second air pipe.

6. The compressed air energy storage system according to claim 1, characterized in that: The initial startup air recovery module includes a low-temperature heat storage unit and a gas storage unit which are sequentially connected to the compressed gas outlet, the low-temperature heat storage unit stores low-temperature heat, and the gas storage unit stores gas after the low-temperature heat is absorbed. The compressed gas outlet and the low-temperature heat storage unit are connected through a third gas pipeline, and a third initial start-up control valve is provided in the third gas pipeline.

7. The compressed air energy storage system according to claim 1, characterized in that: A gas-liquid separator is also provided between the water storage heat exchanger and the gas storage reservoir.

8. The compressed air energy storage system according to claim 7, characterized in that: The water storage heat exchanger also has a low-temperature high-pressure gas outlet, a low-temperature high-pressure gas inlet and a high-temperature high-pressure gas outlet. The gas-liquid separator has a separation inlet and a separation outlet, the separation inlet is connected to the low-temperature high-pressure gas outlet through a second air supply pipe, and a second control valve is provided in the second air supply pipe. The gas storage reservoir has a gas storage inlet and a gas storage outlet. The separation outlet is connected to the gas storage inlet through a gas storage pipe. The gas storage outlet is connected to the low-temperature and high-pressure gas inlet through a third gas supply pipe. A third control valve is provided in the third gas supply pipe.

9. The compressed air energy storage system according to claim 8, characterized in that: The first turbine has a first turbine inlet, and the first turbine inlet is connected to the high-temperature and high-pressure gas outlet through a fourth air supply pipe, and a fourth control valve is provided in the fourth air supply pipe.

10. The compressed air energy storage system according to claim 1, characterized in that: The air inlet is provided with an air filter.

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