Liquid compressed air energy storage system and method based on Claus cycle

Abstract

The invention discloses a liquid compressed air energy storage system based on Klaudes cycle, which comprises a multi-stage compressor, and the multi-stage compressor is sequentially connected with an interstage cooler and a Klaudes cycle unit through a compressed air pipeline; the interstage cooler is further connected with a process water unit through a water pipe, and the Claus circulation unit and the process water unit are connected with a liquefied air storage tank through compressed air pipelines respectively. The invention further discloses an energy storage and release method. According to the liquid compressed air energy storage system and method based on the Clade cycle, compressed air is liquefied through the Clade cryogenic cycle, the size of the compressed air storage tank is reduced, and meanwhile the problem that energy-releasing low-pressure compressed air cannot be continuously utilized is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid compressed air energy storage, and in particular relates to a liquid compressed air energy storage system based on the Claude cycle, and also relates to an energy storage and release method. Background Art

[0002] Compressed air energy storage is one of the most promising and competitive technologies for large-capacity and long-term storage of electrical energy, and it has great strategic significance for the consumption and supplementation of new energy electricity. At present, the forms of gas storage in compressed air energy storage systems mainly include above-ground, natural caves or waste gas mines, and artificial chambers. The compressed air pressure required to be stored in a large-scale energy storage power station of 100 megawatts is about 10MPa, and the gas storage scale is as high as 100,000 to hundreds of thousands of cubic meters. Above-ground gas storage tanks occupy too much area and are only suitable for small-scale applications of compressed air energy storage; the gas storage type of natural caves or waste gas mines is limited in site selection; although the site selection of artificial chambers is more flexible, it is also restricted by geological and hydrological conditions. The common problems of large-scale compressed air storage systems are the difficulty of construction, long cycle, and lack of safety and stability due to the large volume of gas storage. If the compressed air is cryogenically liquefied, this problem can be effectively solved. The critical temperature of compressed air is 132.45K and the critical pressure is 3.77Mpa. When the temperature is not higher than the critical temperature and the pressure is higher than the critical pressure, the compressed air can be transformed from gas to liquid, and the energy storage density can be increased by several to dozens of times, which can greatly reduce the volume of compressed air storage, reduce construction difficulty, and shorten the construction period. Therefore, compressed air liquefaction is of great significance to the development of compressed air energy storage.

[0003] At present, the common problem of compressed air energy storage is that the volume of high-pressure gas storage is too large, which brings more uncertainties in the project site selection and construction process, as well as a series of difficulties in gas storage construction, maintenance, monitoring, etc. At the same time, the low-pressure gas cannot be used during the energy release process. Summary of the invention

[0004] The first purpose of the present invention is to provide a liquid compressed air energy storage system based on the Claude cycle, which utilizes the Claude cryogenic cycle to liquefy the compressed air, reduce the volume of the compressed air storage tank, and solve the problem that the low-pressure compressed air that releases energy cannot be further utilized.

[0005] A second object of the present invention is to provide a method for storing and releasing energy.

[0006] The first technical solution adopted by the present invention is to include a multi-stage compressor, which is connected in sequence to an interstage cooler and a Claude cycle unit through a compressed air pipeline; the interstage cooler is also connected to a process water unit through a water pipe, and the Claude cycle unit and the process water unit are respectively connected to a liquefied air storage tank through a compressed air pipeline.

[0007] The first technical solution of the present invention is also characterized in that: The Claude cycle unit includes a Claude cycle compressor. The interstage cooler is connected to the Claude cycle compressor through a compressed air pipeline. The Claude cycle compressor is sequentially connected to a Claude cycle air cooler, a primary air cooler, an intermediate air cooler, a final stage air condenser and a gas-liquid separator through a compressed air pipeline. The gas-liquid separator is connected to a process water unit.

[0008] The primary air cooler and the intermediate air cooler are commonly connected to a Claude cycle expander through a compressed air pipeline.

[0009] A throttle valve is provided on the compressed air pipeline connecting the final-stage air condenser and the gas-liquid separator.

[0010] The process water unit includes a cold water pump. The interstage cooler is connected to the cold water pump through a water pipe. The cold water pump is connected to a cold water tank, an evaporator, an air preheater, a multi-stage air heater, a hot water pump, and a hot water tank in sequence through the water pipe. The hot water tank is connected to the interstage cooler through a water pipe, and the evaporator is connected to the liquefied air storage tank through a liquefied air lift pump.

[0011] The process water unit also includes a multi-stage expander, which is respectively connected to the multi-stage air heater and the air preheater through a compressed air pipeline.

[0012] The second technical solution adopted by the present invention is an energy storage and release method, which uses a liquid compressed air energy storage system based on the Claude cycle. The specific implementation process is: the compressed air passes through a multi-stage compressor and an interstage cooler as well as a Claude cycle unit and a process water unit in sequence to store and release energy.

[0013] The second technical solution of the present invention is also characterized in that: The specific implementation process of energy storage is as follows: the air passes through a multi-stage compressor and an interstage cooler to increase the air pressure, and then passes through a Claude cycle compressor and a Claude cycle air cooler to compress the air. After compression, the compressed air passes through a primary air cooler, an intermediate air cooler and a final air condenser to cool and condense into low-temperature liquefied air, and then passes through a throttle valve to throttle and expand to reduce the temperature of the liquid and produce a portion of gaseous air. The gas-liquid mixture passes through a gas-liquid separator to separate the gas and liquid, and the liquid compressed air is sent to a liquefied air storage tank for storage. The gaseous compressed air leaves the top of the gas-liquid separator, and passes through the final air condenser, the intermediate air cooler and the primary air cooler in sequence as a refrigerant, and then is sent to the inlet of the Claude cycle compressor as a circulating gas for recirculation. Part of the compressed air cooled by the primary air cooler is sent to the refrigerant inlet of the intermediate air cooler through the compressed air pipeline and the Claude cycle expander after work. As a supplement to the refrigerant, the liquid compressed air flows from the gas-liquid separator into the liquefied air storage tank for storage. The cooling water in the energy storage compression process is input through the cold water tank, transported by the cold water pump to the interstage cooler for heat exchange and turned into 120~190℃ hot water, and then enters the hot water tank for storage to complete the energy storage.

[0014] The specific implementation process of energy release is as follows: the liquid compressed air stored in the liquefied air storage tank is sent to the evaporator through the liquefied air lift pump for low-temperature evaporation. After evaporation, it is heated by the air preheater and the multi-stage air heater, and then enters the inlet of the multi-stage expander to expand and do work, converting the potential energy of the compressed air into electrical energy and releasing it. During the energy release process, the hot water in the hot water tank is utilized in multiple stages. It is first sent to the multi-stage air heater by the hot water pump for heat exchange and then becomes low-temperature water. The low-temperature water is then sent to the air preheater to preheat the compressed air and become low-temperature cooling water. After being sent to the evaporator for heat exchange, it returns to the cold water tank to complete the energy release.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The liquid compressed air energy storage system and method based on the Claude cycle provided by the present invention can deep-cold and liquefy compressed air into liquid for storage. The volume of the gas storage is reduced by several to dozens of times compared with traditional gas storage, breaking through the scale limitation brought by large-capacity gas storage, reducing the engineering workload, shortening the construction period, and improving the flexibility of site selection for conventional compressed air energy storage.

[0016] (2) The liquid compressed air energy storage system and method based on the Claude cycle provided by the present invention solves the problem that low-pressure (≤4MPa) compressed air cannot be used, and improves the energy storage and release capabilities of the system.

[0017] (3) Compared with general refrigeration systems, the liquid compressed air energy storage system and method based on the Claude cycle provided by the present invention uses compressed air as both a cooling medium and a refrigerant, thereby saving a portion of electrical energy. At the same time, a portion of useful work is recovered through the internal cycle, thereby improving the refrigeration capacity of the system.

[0018] (4) The liquid compressed air energy storage system and method based on the Claude cycle provided by the present invention reduces the compressed air storage pressure, but can be restored to a higher pressure through evaporation and pressurization during the energy release process; the liquid compressed air is combined with the air separation process to not only obtain liquid nitrogen and liquid oxygen products, but also improve the energy storage capacity and economy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the liquid compressed air energy storage system based on the Claude cycle of the present invention.

[0020] In the figure, 1. multi-stage compressor; 2. inter-stage cooler; 3. cold water pump; 4. cold water tank; 5. hot water tank; 6. hot water pump; 7. multi-stage air heater; 8. multi-stage expander; 9. air preheater; 10. throttle valve; 11. evaporator; 12. liquefied air lift pump; 13. liquefied air storage tank; 14. gas-liquid separator; 15. final stage air condenser; 16. intermediate air cooler; 17. primary air cooler; 18. Claude cycle expander; 19. Claude cycle air cooler; 20. Claude cycle compressor. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 The present invention provides a liquid compressed air energy storage system based on the Claude cycle, such as Figure 1 As shown, it includes a multi-stage compressor 1, which is connected to an interstage cooler 2 and a Claude cycle unit in sequence through a compressed air pipeline; the interstage cooler 2 is also connected to a process water unit through a water pipe, and the Claude cycle unit and the process water unit are respectively connected to a liquefied air storage tank 13 through a compressed air pipeline.

[0023] The Claude cycle unit includes a Claude cycle compressor 20, the interstage cooler 2 is connected to the Claude cycle compressor 20 through a compressed air pipeline, the Claude cycle compressor 20 is sequentially connected to the Claude cycle air cooler 19, the primary air cooler 17, the intermediate air cooler 16, the final stage air condenser 15 and the gas-liquid separator 14 through the compressed air pipeline, and the gas-liquid separator 14 is connected to the process water unit.

[0024] The process water unit includes a cold water pump 3, the interstage cooler 2 is connected to the cold water pump 3 through a water pipe, the cold water pump 3 is connected to the cold water tank 4, the evaporator 11, the air preheater 9, the multi-stage air heater 7, the hot water pump 6, and the hot water tank 5 in sequence through the water pipe, the hot water tank 5 is connected to the interstage cooler 2 through a water pipe, and the evaporator 11 is connected to the liquefied air storage tank 13 through the liquefied air lift pump 12.

[0025] Example 2 On the basis of Example 1, the primary air cooler 17 and the intermediate air cooler 16 are commonly connected to a Claude cycle expander 18 through a compressed air pipeline; a throttle valve 10 is provided on the compressed air pipeline connecting the final stage air condenser 15 and the gas-liquid separator 14, and the process water unit also includes a multi-stage expander 8, which is respectively connected to a multi-stage air heater 7 and an air preheater 9 through a compressed air pipeline.

[0026] Example 3 This embodiment provides an energy storage and release method, which adopts the liquid compressed air energy storage system based on the Claude cycle provided in the above embodiment. The specific implementation process is: the compressed air passes through the multi-stage compressor 1 and the interstage cooler 2 as well as the Claude cycle unit and the process water unit in sequence to store and release energy.

[0027] The specific implementation process of energy storage is as follows: the air passes through the multi-stage compressor 1 and the interstage cooler 2 to increase the air pressure, and then passes through the Claude cycle compressor 20 and the Claude cycle air cooler 19 to compress the air. After compression, the compressed air passes through the primary air cooler 17, the intermediate air cooler 16 and the final air condenser 15 to cool and condense into low-temperature liquefied air, and then passes through the throttle valve 10 to throttle and expand to reduce the temperature of the liquid and produce a part of gaseous air. The gas-liquid mixture passes through the gas-liquid separator 14 to separate the gas and liquid, and the liquid compressed air is sent to the liquefied air storage tank 13 for storage to complete the energy storage.

[0028] The gaseous compressed air leaves the top of the gas-liquid separator 14, passes through the final air condenser 15, the intermediate air cooler 16, and the primary air cooler 17 in sequence as a refrigerant, and is then sent to the inlet of the Claude cycle compressor 20 as a circulating gas for recirculation; a part of the compressed air cooled by the primary air cooler 17 is sent to the refrigerant inlet of the intermediate air cooler 16 through the compressed air pipeline and the Claude cycle expander 18 after doing work, as a supplement to the refrigerant, the liquid compressed air flows from the gas-liquid separator 14 into the liquefied air storage tank 13 for storage, the cooling water of the energy storage compression process is input through the cold water tank 4, and is transported by the cold water pump 3 to the interstage cooler 2 for heat exchange to become 120~190℃ hot water, and then enters the hot water tank 5 for storage.

[0029] Example 4 On the basis of Example 3, this example provides a specific implementation process of energy release, which is as follows: the liquid compressed air stored in the liquefied air storage tank 13 is sent to the evaporator 11 through the liquefied air lift pump 12 for low-temperature evaporation, and after evaporation, it is heated by the air preheater 9 and the multi-stage air heater 7, and then enters the inlet of the multi-stage expansion machine 8 to expand and do work, converting the potential energy of the compressed air into electrical energy and releasing it, thereby completing the energy release.

[0030] During the energy release process, the hot water in the hot water tank 5 is utilized in multiple stages. It is first sent by the hot water pump 6 to the multi-stage air heater 7 for heat exchange and becomes low-temperature water. The low-temperature water is then sent to the air preheater 9 to preheat the compressed air and become low-temperature cooling water. After being sent to the evaporator 11 for heat exchange, it returns to the cold water tank 4.

[0031] Example 5 This embodiment provides a liquid compressed air energy storage system based on the Claude cycle, such as Figure 1As shown, it is mainly divided into two parts: process water unit and Claude cycle unit. In a complete cycle, the gas path passes through the compressed air pipeline, and successively passes through the multi-stage compressor 1 and the inter-stage cooler 2, the Claude cycle compressor 20, the Claude cycle air cooler 19, the primary air cooler 17, the intermediate air cooler 16, the final air condenser 15, the throttle valve 10, the gas-liquid separator 14, the liquefied air storage tank 13, the liquefied air lift pump 12, the evaporator 11, the air preheater 9, the multi-stage air heater 7 and the multi-stage air cooler 8. The first-stage expansion machine 8 completes a storage and release energy cycle; a part of the compressed air cooled by the primary air cooler 17 bypasses through the compressed air pipeline, and is sent to the refrigerant side of the front end of the intermediate air cooler 16 after work in the Claude cycle expansion machine 18, completing an internal cycle; the compressed air separated by the gas-liquid separator 14 is used as the refrigerant, and is sent to the inlet of the Claude cycle compressor 20 through the compressed air pipeline, the final-stage air condenser 15, the intermediate air cooler 16, and the primary air cooler 17, and is recycled as the circulating gas.

[0032] The water path is connected by a water pipe, passing through the cold water tank 4, the cold water pump 3, the interstage cooler 2, the hot water tank 5, the hot water pump 6, the multi-stage air heater 7, the air preheater 9, the evaporator 11 in sequence, and then returning to the cold water tank 4.

[0033] Example 6 This embodiment provides a liquid compressed air energy storage system and method based on the Claude cycle. The 100MW compressed air energy storage system uses wind and solar power to store energy for a long time for 6 to 10 hours during the day, converts electrical energy into the potential energy of compressed air and then liquefies and stores it. The gas storage volume is reduced from 100,000 cubic meters of gas to thousands of cubic meters of liquid, with a storage pressure of 5 to 10 MPa. During the evening peak, the energy is continuously discharged for 4 to 8 hours. The specific process is as follows: In the energy storage process, the compressed air is passed through the multi-stage compressor 1 and the interstage cooler 2 to increase the compressed air pressure to 4~8MPa, and the temperature is maintained at 20~80℃. Then, the air is compressed to 6~10MPa and 0~40℃ through the Claude cycle compressor 20 and the Claude cycle air cooler 19. The compressed air is cooled and condensed into low-temperature liquefied air through the primary air cooler 17, the intermediate air cooler 16, and the final air condenser 15, and then throttled and expanded through the throttle valve 10 to further reduce the temperature of the liquid and produce a part of gaseous air. The gas-liquid mixture is separated into gas and liquid by the gas-liquid separator 14, and the liquid compressed air is sent to the liquefied air storage tank 13 for storage. The gaseous compressed air leaves the top of the gas-liquid separator 14, passes through the final air condenser 15, the intermediate air cooler 16, and the primary air cooler 17 as a refrigerant, and is then sent to the inlet of the Claude cycle compressor 20 as a circulating gas for recirculation. Part of the compressed air cooled by the primary air cooler 17 bypasses the compressed air pipeline and is sent to the refrigerant inlet of the intermediate air cooler 16 after work by the Claude cycle expander 18 as a refrigerant supplement. The liquid compressed air flows from the gas-liquid separator 14 into the liquefied air storage tank 13 for storage. The cooling water source of the energy storage compression process is the cold water tank 4, which is transported by the cold water pump 3 to the interstage cooler 2 for heat exchange and becomes 120~190℃ hot water, and then enters the hot water tank 5 for storage.

[0034] During the energy release process, the liquid compressed air stored in the liquefied air storage tank 13 is sent to the evaporator 11 through the liquefied air lift pump 12 for low-temperature evaporation. The evaporation process can be pressurized to increase the pressure of the gasified air. After being heated to a certain temperature by the air preheater 9 and the multi-stage air heater 7, it enters the inlet of the multi-stage expander 8 for expansion and work, converting the potential energy of the compressed air into electrical energy and releasing it. During the energy release process, the hot water in the hot water tank 5 is used in multiple stages. It is first sent to the multi-stage air heater 7 by the hot water pump 6 for heat exchange and then becomes low-temperature water. The low-temperature water is then sent to the air preheater 9 to preheat the compressed air and becomes low-temperature cooling water. After being sent to the evaporator 11 for heat exchange, it returns to the cold water tank 4. The energy release process requires that the liquid compressed air in the liquefied air storage tank 13 is above the safe liquid level.

[0035] The equipment in the Claude cycle, the throttle valve 10, the gas-liquid separator 14, the final air condenser 15, the intermediate air cooler 16, the primary air cooler 17, the Claude cycle compressor 20 and the Claude cycle expander 18, operate continuously to supplement the cooling loss. The electric energy consumed by the Claude cycle compressor can be provided by the electric energy generated by the Claude cycle expander 18 or an external power supply.

[0036] In the liquid compressed air energy storage system and method based on the Claude cycle provided in the above embodiments, the specific functions of each device are as follows: The multi-stage compressor 1 is generally composed of 3 to 7 stages. Its function is to accept the abandoned electricity of new energy and convert the electrical energy into compressed air potential energy for storage. It can be integrated or split. The interstage cooler 2 acts after each stage of the compressor. Its function is to absorb the heat generated by the compressed air with process water to make the compression process as close to isothermal as possible. The function of the cold water pump 3 is to provide cooling water for the interstage cooler 2. The main function of the cold water tank 4 is to store low-temperature cooling water for cooling the multi-stage compressor 1. The main function of the hot water tank 5 is to store high-temperature hot water for heating the compressed air before expansion and work. It has a certain pressure, generally 0.3~1MP. a (G); the function of the hot water pump 6 is to provide heating water for the multi-stage air heater 7; the function of the multi-stage air heater 7 is to heat the compressed air before entering the expander; the function of the multi-stage expander 8 is to convert the potential energy of the compressed air into electrical energy during the energy release process, and to expand the compressed air before releasing it, generally for 2 to 5 stages; the function of the air preheater 9 is to preheat the low-temperature compressed air; the function of the throttle valve 10 is to perform throttling expansion, further reduce the temperature and pressure of the liquid compressed air, and gasify part of the liquid air; the function of the evaporator 11 is to evaporate the liquid compressed air during energy release to generate gaseous compressed air; liquefied air lift pump The function of 12 is to lift the liquid compressed air from the liquefied air storage tank 13 to the evaporator 11; the function of the liquefied air storage tank 13 is to store the liquid compressed air; the function of the gas-liquid separator 14 is to separate the gas and liquid of the compressed air, store the liquid, and send the gas as a refrigerant to the final air condenser 15; the function of the final air condenser 15 is to condense the compressed air into liquid; the function of the intermediate air cooler 16 is to cool the compressed air to a low temperature, which can be a single stage or a multi-stage; the function of the primary air cooler 17 is to perform preliminary low-temperature cooling on the compressed air; the function of the Claude cycle expander 18 is to extract a portion of the compressed air from the primary air cooler 17. Part of the compressed air is expanded at low temperature to do work. The temperature of the gas after doing work is even lower and is sent to the refrigerant inlet of the intermediate air cooler 16 as a supplement to the refrigerant. On the one hand, it recovers part of the useful work, and on the other hand, it increases the amount of refrigerant, improves the liquefaction rate of compressed air and reduces the liquefaction temperature; the function of the Claude cycle air cooler 19 is to cool the compressed air. The cooling medium can be compressed air or cooling water from a cold tank according to the design temperature; the function of the Claude cycle compressor 20 is to compress the compressed air to above the critical pressure of the compressed air. Generally, a certain margin needs to be considered to offset the pressure of the extended resistance loss and the throttling loss.

[0037] In summary, the Claude cycle-based liquid compressed air energy storage system and method of the present invention utilizes the Claude cycle method to cryogenically liquefy compressed air into liquid for storage, which can not only reduce the compressed air storage volume, but also improve the compressed air utilization rate. At the same time, it also breaks through the scale limitation of compressed air energy storage and improves the storage and discharge capacity of the entire system.

Claims

1. A liquid compressed air energy storage system based on the Claude cycle, characterized in that: The invention comprises a multi-stage compressor (1), wherein the multi-stage compressor (1) is sequentially connected to an interstage cooler (2) and a Claude cycle unit via a compressed air pipeline; the interstage cooler (2) is also connected to a process water unit via a water pipe, and the Claude cycle unit and the process water unit are respectively connected to a liquefied air storage tank (13) via a compressed air pipeline.

2. The liquid compressed air energy storage system based on the Claude cycle according to claim 1 is characterized in that: The Claude cycle unit comprises a Claude cycle compressor (20), the interstage cooler (2) is connected to the Claude cycle compressor (20) via a compressed air pipeline, the Claude cycle compressor (20) is sequentially connected to a Claude cycle air cooler (19), a primary air cooler (17), an intermediate air cooler (16), a final stage air condenser (15) and a gas-liquid separator (14) via the compressed air pipeline, and the gas-liquid separator (14) is connected to a process water unit.

3. The liquid compressed air energy storage system based on the Claude cycle according to claim 2 is characterized in that: The primary air cooler (17) and the intermediate air cooler (16) are connected to a Claude cycle expander (18) via a compressed air pipeline.

4. The liquid compressed air energy storage system based on the Claude cycle according to claim 3 is characterized in that: A throttle valve (10) is provided on the compressed air pipeline connecting the final-stage air condenser (15) and the gas-liquid separator (14).

5. The liquid compressed air energy storage system based on the Claude cycle according to claim 4 is characterized in that: The process water unit comprises a cold water pump (3), the interstage cooler (2) is connected to the cold water pump (3) via a water pipe, the cold water pump (3) is sequentially connected to a cold water tank (4), an evaporator (11), an air preheater (9), a multi-stage air heater (7), a hot water pump (6), and a hot water tank (5) via the water pipe, the hot water tank (5) is connected to the interstage cooler (2) via the water pipe, and the evaporator (11) is connected to a liquefied air storage tank (13) via a liquefied air lift pump (12).

6. The liquid compressed air energy storage system based on the Claude cycle according to claim 5 is characterized in that: The process water unit further comprises a multi-stage expander (8), wherein the multi-stage expander (8) is respectively connected to the multi-stage air heater (7) and the air preheater (9) via compressed air pipelines.

7. Energy storage and release method, characterized in that: The liquid compressed air energy storage system based on the Claude cycle as described in claim 6 is specifically implemented as follows: the compressed air sequentially passes through the multi-stage compressor (1) and the interstage cooler (2) as well as the Claude cycle unit and the process water unit to store and release energy.

8. The liquid compressed air energy storage system based on the Claude cycle according to claim 7 is characterized in that: The specific implementation process of the energy storage is as follows: the air passes through the multi-stage compressor (1) and the interstage cooler (2) to increase the air pressure, and then passes through the Claude cycle compressor (20) and the Claude cycle air cooler (19) to compress the air. After compression, the compressed air passes through the primary air cooler (17), the intermediate air cooler (16) and the final air condenser (15) to cool and condense into low-temperature liquefied air, and then passes through the throttle valve (10) for throttling expansion to reduce the temperature of the liquid and generate a portion of gaseous air. The gas-liquid mixture passes through the gas-liquid separator (14) for gas-liquid separation, and the liquid compressed air is sent to the liquefied air storage tank (13) for storage. The gaseous compressed air leaves the top of the gas-liquid separator (14), passes through the final air condenser (15), the intermediate air cooler (16) and the primary air cooler (17) in sequence as a refrigerant, and then is sent to the inlet of the Claude cycle compressor (20) as a circulating gas for recirculation; A portion of the compressed air cooled by the primary air cooler (17) is sent to the refrigerant inlet of the intermediate air cooler (16) through the compressed air pipeline and the Claude cycle expander (18) after work as a supplement to the refrigerant. The liquid compressed air flows from the gas-liquid separator (14) into the liquefied air storage tank (13) for storage. The cooling water in the energy storage compression process is input through the cold water tank (4) and transported by the cold water pump (3) to the interstage cooler (2) for heat exchange to become 120-190°C hot water, and then enters the hot water tank (5) for storage, thereby completing the energy storage.

9. The liquid compressed air energy storage system based on the Claude cycle according to claim 7, characterized in that: The specific implementation process of the energy release is as follows: the liquid compressed air stored in the liquefied air storage tank (13) is sent to the evaporator (11) through the liquefied air lift pump (12) for low-temperature evaporation. After evaporation, the liquid compressed air is heated by the air preheater (9) and the multi-stage air heater (7), and then enters the inlet of the multi-stage expander (8) for expansion and work, converting the potential energy of the compressed air into electrical energy and releasing it. During the energy release process, the hot water in the hot water tank (5) is utilized in multiple stages. It is first sent to the multi-stage air heater (7) by the hot water pump (6) for heat exchange and then becomes low-temperature water. The low-temperature water is then sent to the air preheater (9) to preheat the compressed air and becomes low-temperature cooling water. After being sent to the evaporator (11) for heat exchange, it returns to the cold water tank (4) to complete the energy release.

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