Compressed air energy storage system

Abstract

The utility model discloses a compressed air energy storage system, and relates to the technical field of electric power energy storage. A compressor unit of the compressed air energy storage system comprises at least one stage of compression unit, and a bleeding heat exchanger is arranged at an outlet of the compression unit from the first stage of compression unit; the cooling capacity of the cold side of the bleeding heat exchanger comes from the cooling device; a hot side inlet of the water separating heat exchanger is communicated with an outlet of the first-stage compression unit, high-temperature compressed air flowing out of the outlet of the first-stage compression unit is introduced into the hot side of the water separating heat exchanger, and condensed water is separated out after heat exchange is carried out in the water separating heat exchanger; when the humidity of the air is high, the air is compressed by the compression unit and then cooled by the bleeding heat exchanger to generate a large amount of condensate water. The compressed air energy storage system solves the technical problem that a large amount of water exists in the compression unit in the energy storage process of the compressed air energy storage system in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of power energy storage technology, and in particular to a compressed air energy storage system. Background Technology

[0002] Compressed air energy storage (CASS) is a technology that uses compressed air to store energy. It is currently considered by the industry to be one of the technologies suitable for large-scale power storage at the GW level. Its main applications include power frequency regulation, voltage regulation, peak regulation, load balancing, static energy storage, and grid black start. The working principle of CASS is as follows: during off-peak hours, electrical energy is used to compress air to high pressure and store it in a pressure vessel, converting electrical energy into the internal energy of the air. During peak hours, the high-pressure air is released from the storage tank and drives an expander to generate electricity.

[0003] In the process of developing this invention, the inventors discovered at least the following problems in the prior art: When the relative humidity in the air is high, the air temperature rises after compression, and a large amount of condensate is generated upon cooling. Compressed air energy storage systems contain compressor units, which include at least one compression unit. When the air humidity is high, a large amount of condensate will appear in the existing compression units. This condensate has a significant impact on the equipment, especially corroding pipes and pneumatic equipment, shortening their lifespan, and causing safety hazards. Therefore, how to quickly remove the condensate and avoid affecting other equipment in the system is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a compressed air energy storage system that does not produce condensate in the compression unit during the compression process.

[0005] To achieve this objective, a compressed air energy storage system is provided. The compressor unit includes at least one compression unit. Starting from the first compression unit, a water-cooling heat exchanger is provided at the outlet of the compression unit. The cooling capacity on the cold side of the water-cooling heat exchanger comes from a cooling device. The hot side inlet of the water-cooling heat exchanger is connected to the outlet of the first compression unit. High-temperature compressed air flowing out of the outlet of the first compression unit is introduced into the hot side of the water-cooling heat exchanger. After heat exchange in the water-cooling heat exchanger, condensate is precipitated. A gas-water separator is provided at the hot side outlet of the water-cooling heat exchanger. Water-containing compressed air is separated and condensate is discharged through the gas-water separator.

[0006] Furthermore, the cold side of the water separation heat exchanger includes a first cold side, through which the cooling capacity of the cooling device is introduced; the cold side of the water separation heat exchanger also includes a second cold side, through which the heat of compression in the compressed air is recovered.

[0007] Furthermore, the inlet of the second cold side is connected to the cold storage tank, and the outlet of the second cold side is connected to the heat storage tank; the cold storage tank is used to store low-temperature heat storage medium, and the heat storage tank is used to store high-temperature heat storage medium.

[0008] Furthermore, the water separation heat exchanger adopts a three-flow heat exchanger.

[0009] Furthermore, the cooling device is a cooling tower.

[0010] Furthermore, it also includes an intermediate heat exchanger, which divides the cooling device and the cold side of the water separation heat exchanger into two independent loops.

[0011] Furthermore, the cold side of the intermediate heat exchanger forms a closed loop with the cooling device; the hot side inlet of the intermediate heat exchanger is connected to the first cold side outlet of the water separation heat exchanger, and the hot side of the intermediate heat exchanger forms a closed loop with the first cold side of the water separation heat exchanger.

[0012] Furthermore, a water inlet is provided on the pipeline between the hot side outlet of the intermediate heat exchanger and the first cold side inlet of the water separation heat exchanger, and the water inlet is equipped with a pressure stabilizing device.

[0013] Furthermore, the cooling tower has a water inlet on its liquid outlet pipe, and the water inlet is equipped with a pressure stabilizing device.

[0014] Furthermore, the pressure stabilizing device includes a pressure stabilizing tank, a water supply tank, and a water supply pump; the pressure stabilizing tank is connected to the water supply inlet and is used to maintain the pressure of the cooling tower's outlet pipeline; the pressure stabilizing tank controls the start and stop of the water supply pump; the water supply pump is located on the pipeline between the water supply tank and the water supply inlet.

[0015] One of the above technical solutions has the following advantages or beneficial effects: The compressor unit operating in the energy storage process includes at least one compression unit. Starting from the first compression unit, a water-separating heat exchanger is installed at the outlet of the compression unit. The cooling capacity on the cold side of the water-separating heat exchanger comes from a cooling device. The hot-side inlet of the water-separating heat exchanger is connected to the outlet of the first compression unit. The high-temperature compressed air flowing out of the outlet of the first compression unit enters the hot side of the water-separating heat exchanger, where it undergoes heat exchange and condensates. When the air humidity is high, a large amount of condensate will be generated after the air is compressed by the compression unit and then cooled by the water-separating heat exchanger. A gas-liquid separator is installed at the hot-side outlet of the water-separating heat exchanger, and the water-containing compressed air is separated and the condensate is discharged through the gas-liquid separator. Therefore, the compressed air energy storage system of this solution will not generate condensate in the compression unit during the energy storage compression process, and will not affect the safety of the equipment. Attached Figure Description

[0016] Figure 1This is a structural flow diagram of a compressed air energy storage system according to Embodiment 1;

[0017] Figure 2 yes Figure 1 A schematic diagram showing the connection of the water exchanger in the system;

[0018] Figure 3 This is a structural flow diagram of another compressed air energy storage system in Example 1;

[0019] Figure 4 This is a structural flow diagram of a compressed air energy storage system according to Embodiment 2;

[0020] Figure 5 This is a structural flowchart of another compressed air energy storage system in Example 2.

[0021] In the diagram: 11-First stage compression unit; 12-Second stage compression unit; 14-Gas-water separator; 21-Water separation heat exchanger; 211-Hot side of water separation heat exchanger; 212-First cold side; 213-Second cold side; 22-Intermediate heat exchanger; 30-Cooling tower; 31-Buffer water tank; 41-Cold storage tank; 42-Heat storage tank; 43-First stage regenerative heat exchanger; 44-Reheat heat exchanger; 51-Expansion unit; 61-Water inlet; 62-Pressure stabilizing tank; 63-Water supply tank; 64-Water supply pump; 71-First pump; 72-Second pump; 73-Third pump; 74-Fourth pump; 75-Fifth pump; 80-Gas storage tank; 91-Electric motor; 92-Generator. Detailed Implementation

[0022] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] like Figure 1 As shown, the compressed air energy storage system provided in this embodiment includes a compressor unit, which is used to compress air into high-pressure air. The compressor unit includes a multi-stage compression unit connected in series and driven by an electric motor 91. Figure 1 The diagram illustrates an embodiment of a compressor unit comprising two stages of compression. Viewed from the air inlet, a first-stage compression unit 11 and a second-stage compression unit 12 are connected in series via drive shafts. The first-stage compression unit 11 is electrically connected to a motor 91. The compressor unit's outlet is connected to an air storage tank 80, which stores compressed high-pressure air. The air storage tank 80 can be any existing air storage method. During the energy storage stage, air enters the compressor unit from the first-stage compressor, is compressed, and then stored in the air storage tank.

[0026] like Figures 1-5 As shown, in this embodiment of the compressed air energy storage system, starting from the first-stage compression unit, a water-removing heat exchanger 21 is installed at the outlet of the compression unit. The cooling capacity on the cold side of the water-removing heat exchanger 21 comes from the cooling device. The water-removing heat exchanger 21 serves two purposes: firstly, to remove liquid water from the compressed air, and secondly, to recover the heat of compression. The hot-side inlet of the water-removing heat exchanger is connected to the outlet of the first-stage compression unit. The high-temperature compressed air flowing out of the outlet of the first-stage compression unit 11 enters the hot side of the water-removing heat exchanger 21. After the compressed air flowing out of the outlet of the first-stage compression unit 11 enters the water-removing heat exchanger 21, its temperature drops after heat exchange with its cold side, causing condensate to be removed from the compressed air. The hot-side outlet of the water-removing heat exchanger 21 has a gas-liquid separator. The water-containing compressed air flowing out of the hot-side outlet of the water-removing heat exchanger 21 is separated and the condensate is discharged by the gas-liquid separator 14. The drier compressed air enters the next-stage compression unit from the outlet of the gas-liquid separator. Therefore, the above structure does not produce a large amount of condensate during the energy storage compression process. If the air has a high moisture content, a water separation heat exchanger can be installed at the outlet of the next stage compression unit. The connection method of the water separation heat exchanger is the same as that of the water separation heat exchanger at the outlet of the first stage compression unit 11. Preferably, a water separation heat exchanger is installed at the outlet of each of the first three stages of the compressor unit.

[0027] like Figure 2 The cold side of the water-exchange heat exchanger 21 includes a first cold side 212 and a second cold side 213. The cooling capacity of the first cold side 212 is provided by a cooling device, which will be described in detail below. The compression heat in the compressed air is recovered through the second cold side of the water-exchange heat exchanger 21. The cooling capacity of the second cold side 213 is provided by a cold storage tank within the system. The cold storage tank contains a low-temperature heat storage medium used to store the cooling capacity of the compressed air during the energy release phase. The inlet of the second cold side 213 is connected to the cold storage tank 41, and the outlet of the second cold side 213 is connected to the heat storage tank 42, which is used to store the high-temperature heat storage medium. In the second cold side 213, the low-temperature heat storage medium exchanges heat with the high-temperature compressed air, causing the compressed air temperature to drop and the heat storage medium temperature to rise. The high-temperature heat storage medium is then stored in the heat storage tank 42. In summary, the outlet of the cold storage tank 41, the second cold side of each group of water-exchange heat exchangers 21, and the inlet of the heat storage tank 42 all form a passage. A pump for providing circulation power is installed in this passage, such as... Figure 2 The second pump 72 is shown in the figure.

[0028] like Figures 1-5 The cooling device that provides cooling capacity to the hot side of the water-electrolysis heat exchanger 212 can be a cooling tower 30. The cooling tower 30 uses water as a circulating refrigerant. It discharges heat from the hot side of the water-electrolysis heat exchanger to the atmosphere while simultaneously lowering the water temperature inside the tower. The outlet of the cooling tower is connected to the inlet of the first cold side 212. The cooling water in the cooling tower carries away the heat from the compressed air on the hot side via the first cold side 212. The outlet of the first cold side 212 is connected to the return outlet of the cooling tower 30. Accordingly, a passage is formed between the first cold side of each set of water-electrolysis heat exchangers 21 and the cooling tower 30, and a pump for providing circulation power is installed in this passage, such as... Figure 1 The second pump 71 is shown in the figure.

[0029] In the aforementioned water separation heat exchanger, at least one stream can be provided for both the first cold side and the second cold side. If there is only one stream for both the first and second cold sides, then the water separation heat exchanger 21 can use a three-stream heat exchanger to reduce airlock resistance. In the three-stream heat exchanger, one stream is the hot side, and the remaining streams are the first and second cold sides. If there is more than one stream for both the first and second cold sides, the water separation heat exchanger 21 can use a multi-stream heat exchanger, where one stream is the hot side, and the remaining streams are divided into the first and second cold sides.

[0030] The water separation process of the compressed air energy storage system in this embodiment is as follows: the outside air is compressed by the first-stage compression unit 11 and then cooled by the first and second cold sides of the water separation heat exchanger 21 to condense water. The condensate water is discharged through the air-water separator 14, and the relatively dry outside air enters the next compression unit.

[0031] If, after passing through the first N stages of compression units, the first N sets of water separation heat exchangers, and the first N sets of air-water separators, the outside air has already reached a high pressure level and its moisture content is extremely low, then no further water separation treatment is needed. At this point, starting from the N+1 stage of compression unit, a regenerative heat exchanger is installed at the outlet of each stage of compression unit. The regenerative heat exchanger is used to recover heat from the compressed air and is used during energy release. Figures 1-5 The example shown is an embodiment with N=1, where a regenerative heat exchanger is installed at the outlet of the second-stage compression unit. Starting from the N+1th stage compression unit, the outlet of each compression unit is connected to the hot-side inlet of a set of regenerative heat exchangers, the hot-side outlets of each set of regenerative heat exchangers 43 are connected to the inlet of the next stage compression unit, and the hot-side outlet of the last set of regenerative heat exchangers 43 is connected to the gas storage tank.

[0032] The regenerative heat exchanger is used to recover heat from compressed air and utilize it during energy release. Specifically, the cold-side inlet of each set of regenerative heat exchangers 43 is connected to the cold storage tank 41, and the cold-side outlet of each set of regenerative heat exchangers 43 is connected to the inlet of the heat storage tank 42. During energy storage, the high-temperature compressed air at the outlet of the compression unit is cooled by the low-temperature medium in the cold storage tank through the regenerative heat exchanger, and the heat of compression of the compressed air is stored in the heat storage tank 42. A pump for driving the circulation is installed on the pipeline between the outlet of the cold storage tank 41 and the cold-side inlet of each stage of the regenerative heat exchanger 43, such as... Figure 1 The third pump 73 is shown.

[0033] Furthermore, the cooling tower 30 that provides cooling capacity to the first cold side of the water-exchange heat exchanger 21 can be an open cooling tower, and any existing open cooling tower can be selected. The open cooling tower has a sprayer at the top and a chilled water storage tank at the bottom. The cooling water for the open cooling tower is drawn from the chilled water storage tank located at the bottom of the cooling tower 30, and the return outlet of the open cooling tower 30 is located below the sprayer. The inlet of the first cold side of the water-exchange heat exchanger 21 is low-temperature cooling water, using the chilled water from the cooling tower's chilled water storage tank. The outlet of the first cold side of the water-exchange heat exchanger 21 is high-temperature cooling water. The high-temperature cooling water enters the return outlet of the cooling tower 30, and after being cooled by the open cooling tower 30, it becomes low-temperature cooling water and flows into the chilled water storage tank for the next cycle.

[0034] Furthermore, the cooling tower 30 that provides cooling capacity to the first cold side of the water separation heat exchanger 21 can also be a closed-loop cooling tower, and any existing closed-loop cooling tower can be selected. The closed-loop cooling tower has a return port and a cooling water outlet. The inlet of the first cold side of the water separation heat exchanger 21 is connected to the cooling water outlet, and the outlet of the first cold side of the water separation heat exchanger 21 is connected to the return port of the cooling tower 30.

[0035] like Figure 2The cooling tower 30 has a water inlet 61 on its outlet pipe, and the water inlet 61 is equipped with a pressure stabilizing device. If the cooling tower 30 is a closed-loop cooling tower, then the outlet pipe, the first cold side of the water exchanger 21, and the return pipe of the closed-loop cooling tower form a closed loop. Within the closed loop, the temperature of the cooling water in the outlet pipe of the closed-loop cooling tower is the lowest, the temperature of the cooling water at the outlet of the first cold side of the water exchanger 21 rises, and the temperature of the cooling water in the return pipe of the closed-loop cooling tower is the highest. This temperature variation causes pressure instability within the closed loop. Therefore, in this embodiment, a pressure stabilizing device is installed on the outlet pipe of the cooling tower 30 to solve the problem of pressure instability within the closed loop.

[0036] like Figure 3 One structure of the pressure stabilizing device is as follows: The pressure stabilizing device includes a pressure stabilizing tank 62, a water supply tank 63, and a water supply pump 64, used to stabilize the pressure in the pipeline at the water supply inlet 61. The pressure stabilizing tank is connected to the water supply inlet and is used to maintain the pressure of the cooling tower's outlet pipeline. The pressure stabilizing tank 62 includes an air chamber and a water chamber, which are separated by a rubber diaphragm. The pressure stabilizing tank 62 is connected to the water supply inlet 61 via a pipeline, with one end of the pipeline connected to the water chamber of the pressure stabilizing tank 62 and the other end connected to the water supply inlet 61. The pressure stabilizing tank 62 is used to maintain the pressure of the cooling tower's outlet pipeline. The set pressure of the pressure stabilizing tank 62 is adjusted by adjusting the air volume of the air chamber, and is used to detect the pressure of the connected passage. The water supply pump is located on the pipeline between the water supply tank 63 and the water supply inlet. The pressure stabilizing tank 62 is electrically connected to the water supply pump 64 and is used to control the opening and closing of the water supply pump 64. When the pressure stabilizing tank 62 detects that the pressure in the pipeline where the water inlet 61 is located is lower than the set pressure, the pressure stabilizing tank 62 controls the water replenishment pump 64 to start. The water replenishment pump 64 opens the pipeline of the water replenishment tank 63, using the liquid in the tank to replenish the water inlet 61. When the pressure stabilizing tank 62 detects that the pressure has reached the set value, the water replenishment pump 64 is turned off. The operating conditions when the water inlet 61 needs to drain are similar to those when it needs to replenish water. The water replenishment tank 63 is used to store liquids for replenishment, such as demineralized water. The water replenishment tank 63 has an inlet, through which demineralized water from the system pipeline enters and is stored in the water replenishment tank 63. When the water level in the water replenishment tank 63 is low, the valve on the pipeline is opened to replenish water to the water replenishment tank 63.

[0037] like Figure 4 and Figure 5The compressed air energy storage system of this embodiment also includes an intermediate heat exchanger 22. The hot-side outlet of the intermediate heat exchanger 22 is connected to the first cold-side inlet of the water separation heat exchanger 21, and the first cold-side outlet of the water separation heat exchanger 21 is connected to the hot-side inlet of the intermediate heat exchanger 22. The outlet of the cooling tower 30 is connected to the cold-side inlet of the intermediate heat exchanger 22, and the cold-side outlet of the intermediate heat exchanger 22 is connected to the return outlet of the cooling tower 30. A buffer water tank 31 is installed on the pipeline of the outlet of the cooling tower 30 to store low-temperature cooling water. The outlet of the cooling tower 30, the cold side of the intermediate heat exchanger 22, and the return outlet of the cooling tower 30 form a closed loop, which is powered by a fifth pump 75. The fifth pump 75 is located on the outlet pipeline of the buffer water tank 31. In this embodiment, an intermediate heat exchanger 22 separates the cooling tower 30 from the water separation heat exchanger 21, preventing blockage of the water separation heat exchanger 21 due to impurities in the cooling water of the cooling tower 30. Even when using an open cooling tower 30, which is prone to impurities, the long-term continuous and stable operation of the compressed air energy storage system can be guaranteed. The open cooling tower 30 has the advantages of low cost and energy saving, and its use can significantly reduce the initial investment of large-scale compressed air energy storage systems.

[0038] like Figure 5 A closed loop is formed between the first cold side of the water-exchange heat exchanger 21 and the hot side of the intermediate heat exchanger 22. Pressure changes occur in this section of the pipeline during circulation. A water inlet 61 is installed on the pipeline between the hot side outlet of the intermediate heat exchanger 22 and the first cold side inlet of the water-exchange heat exchanger 21. The water inlet 61 is equipped with a pressure stabilizing device. The pressure stabilizing device can adopt the structure described above.

[0039] The compressed air energy storage system provided in this embodiment also includes an energy release process. The energy release process involves an expander unit utilizing high-pressure air to generate electricity. The expander unit includes at least two expansion units 51. Figure 1 The diagram illustrates an implementation of an expander unit comprising two stages of expansion units. Adjacent expansion units 51 are connected in series, with the output shaft of the last expansion unit 51 connected to a generator 92, generating electricity using compressed air expansion. Specifically, when the power grid or other electrical equipment requires power, the outlet valve of the gas storage tank is opened. The compressed air in the gas storage tank first enters the cold side of the reheat heat exchanger 44. The hot side of the reheat heat exchanger 44 is connected to a heat storage tank, where the compressed air is heated by the heat from the heat storage tank. The cold side outlet of the reheat heat exchanger 44 is connected to the inlet of the expansion unit. The heated compressed air enters the inlet of the expansion unit 51, and after expansion, the drive shaft of the expansion unit is connected to the generator, driving the generator to generate electricity. The hot side outlet of the reheat heat exchanger 44 is connected to the inlet of the cold storage tank, storing the cold energy in the compressed air into the cold storage tank. A fourth pump 74 is installed in the passageway of the outlet of the heat storage tank 42, the hot side of the reheat heat exchanger 44, and the inlet of the cold storage tank 41. The fourth pump 74 is used to provide power to the above passageways.

[0040] In summary, the compressed air energy storage system of this embodiment, due to the inclusion of a water-cooling heat exchanger, allows the compressed air from the first-stage compressor outlet to pass through the water-cooling heat exchanger. Furthermore, the cooling capacity of the first cold side of the water-cooling heat exchanger is provided by a cooling tower, which has the advantage of large cooling capacity. Therefore, the compressed air energy storage system of this embodiment can quickly remove condensate from the compressed air, preventing condensate from forming when the compressed air enters the subsequent compression unit for further cooling. In addition, the compressed air energy storage system of this embodiment, due to the inclusion of an intermediate heat exchanger, has the advantage of being less prone to internal clogging, enabling long-term continuous and stable operation.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A compressed air energy storage system, characterized in that, The compressor unit includes at least one compression unit. Starting from the first compression unit, a water separation heat exchanger is provided at the outlet of the compression unit. The cooling capacity of the cold side of the water separation heat exchanger comes from a cooling device. The hot side inlet of the water separation heat exchanger is connected to the outlet of the first stage compression unit. High-temperature compressed air flowing out of the outlet of the first stage compression unit is introduced into the hot side of the water separation heat exchanger, and condensate is precipitated after heat exchange in the water separation heat exchanger. A gas-water separator is installed at the hot side outlet of the water-exchange heat exchanger, through which water-containing compressed air is separated and condensate is discharged.

2. The compressed air energy storage system according to claim 1, characterized in that, The cold side of the water separation heat exchanger includes a first cold side, through which the cooling capacity of the cooling device is introduced; the cold side of the water separation heat exchanger also includes a second cold side, through which the heat of compression in the compressed air is recovered.

3. The compressed air energy storage system according to claim 2, characterized in that, The inlet of the second cold side is connected to the cold storage tank, and the outlet of the second cold side is connected to the heat storage tank; the cold storage tank is used to store low-temperature heat storage medium, and the heat storage tank is used to store high-temperature heat storage medium.

4. The compressed air energy storage system according to claim 2, characterized in that, The water separation heat exchanger is a three-flow heat exchanger.

5. The compressed air energy storage system according to claim 1, characterized in that, The cooling device is a cooling tower.

6. The compressed air energy storage system according to claim 1, characterized in that, It also includes an intermediate heat exchanger, which divides the cooling device and the cold side of the water separation heat exchanger into two independent loops.

7. The compressed air energy storage system according to claim 6, characterized in that, The cold side of the intermediate heat exchanger forms a closed loop with the cooling device; the hot side inlet of the intermediate heat exchanger is connected to the first cold side outlet of the water separation heat exchanger, and the hot side of the intermediate heat exchanger forms a closed loop with the first cold side of the water separation heat exchanger.

8. The compressed air energy storage system according to claim 7, characterized in that, A water inlet is provided on the pipeline between the hot side outlet of the intermediate heat exchanger and the first cold side inlet of the water separation heat exchanger, and a pressure stabilizing device is provided on the water inlet.

9. The compressed air energy storage system according to claim 5, characterized in that, The cooling tower is equipped with a water inlet on its liquid outlet pipe, and the water inlet is equipped with a pressure stabilizing device.

10. The compressed air energy storage system according to claim 8 or 9, characterized in that, The pressure stabilizing device includes a pressure stabilizing tank, a water supply tank, and a water supply pump; The pressure stabilizing tank is connected to the water inlet and is used to maintain the pressure of the cooling tower's outlet pipeline; the pressure stabilizing tank controls the start and stop of the water inlet pump; The water replenishment pump is located on the pipeline between the water replenishment tank and the water replenishment port.

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