Multifunctional medium-temperature pressure storage system based on double-clutch four-stage compression

Abstract

The utility model relates to the technical field of compressed air energy storage, in particular to a multifunctional medium-temperature pressure storage system based on double-clutch four-stage compression, which comprises an air preheating system, a compressed air system, an air expansion power generation system, an air storage system, a multi-stage compression heat recycling system, an electric heating pressure water heat storage system and a final-stage compression heat cooling system. Through coupling control of multiple systems, energy storage and release of the air compression system are achieved, the system can be adjusted in time according to real-time energy fluctuation of a power grid, rapid peak regulation of the whole power grid system is achieved, the air temperature of an inlet of the compressor can be adjusted according to seasonal changes, and the energy utilization rate of the system is improved. The system can be operated through a phase modifier under a non-power-generation working condition, reactive compensation is carried out on a power grid, and the problems of unstable power system energy input, poor operating environment temperature adaptability, inertia loss, insufficient reactive power and the like caused by new energy grid connection are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressed air energy storage, in particular to a multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression. Background Art

[0002] The establishment of the "dual carbon" goals reflects my country's commitment to global climate governance. To achieve these goals, a new energy and power system is being constructed within the energy sector to accelerate energy restructuring and increase the proportion of non-fossil energy. This new energy and power system is a power supply system that is primarily based on renewable energy and combines efficient and clean utilization of traditional energy sources to achieve a low-carbon, environmentally friendly, and sustainable development.

[0003] The integration of renewable energy sources introduces numerous uncertainties to the safe and stable operation of power grids. While this integration reduces the connectivity between substation sites in the original plan, diminishing the mutual supply between substations and the reliability of inter-station connectivity, it also enhances the flexibility of distribution networks. However, this also complicates wiring patterns, reduces the transfer and load capacity between lines, and even impacts network losses and line power factor.

[0004] In order to solve the problems brought about by the grid connection of new energy sources, such as unstable energy input of the power system, poor adaptability to the operating environment temperature, lack of inertia, insufficient reactive power, etc., it is necessary to develop a multifunctional and highly flexible energy storage system to cope with the impact of the increasing share of new energy in the power system on the power grid. Utility Model Content

[0005] The purpose of the present invention is to provide a multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression in order to address the above-mentioned deficiencies.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression, including an air preheating system, a compressed air system, an air expansion power generation system, an air storage system, a multi-stage compression heat recovery and utilization system, an electrically heated pressure water heat storage system, and a final compression heat cooling system. The air preheating system is used to preheat the air at the compressor inlet, the compressed air system is used to pressurize the ambient air, the multi-stage compression heat recovery and utilization system is used to recover and utilize the compression heat of each stage using a heat exchanger, the air storage system is used to store pressurized high-pressure air, the air expansion power generation system is used to utilize the high-pressure air to enter the turbine for expansion and work, and drive the generator to generate electricity, the electrically heated pressure water heat storage system is used to recover the heat of the compressed air and control the water temperature fluctuation by connecting to the power grid to control the heating power, and the final compression heat cooling system is used to heat the compressor inlet air under different demand conditions and cool the compressed air before entering the storage tank.

[0008] Furthermore, the air preheating system includes an air preheater, and cold air enters the air preheater from inlet a, is preheated by the air preheater, and then enters the compressed air system from outlet b.

[0009] Furthermore, the compressed air system includes a stage I compressor, a first motor, a stage II compressor, a second motor, a third motor, a stage III compressor, a fourth motor, and a stage IV compressor; the multi-stage compression heat recovery and utilization system includes a first cooler, a second cooler and a third cooler; the preheated air enters the stage I compressor from outlet b, the outlet c of the stage I compressor is connected to the inlet d of the first cooler, the outlet g of the first cooler is connected to the inlet h of the stage II compressor, the outlet i of the stage II compressor is connected to the inlet j of the second cooler, the outlet m of the second cooler is connected to the inlet n of the stage III compressor, the outlet o of the stage III compressor is connected to the inlet p of the third cooler, the outlet s of the third cooler is connected to the inlet t of the stage IV compressor, the outlet u of the stage IV compressor is connected to the inlet v of the last stage heat exchanger of the last stage compression heat cooling system, and the compressed air flows into the air storage system after releasing heat, and the compressors of each stage form a multi-stage series air compression system.

[0010] Furthermore, the air expansion power generation system includes a stage I expander, a stage II expander, a stage III expander, an exhaust chimney and a generator, and the first 3S clutch and the second 3S clutch are respectively connected on both sides of the generator; the electrically heated pressure water heat storage system includes a first heater, a second heater and a third heater; high-pressure air enters the first heater through the inlet x, enters the inlet ab of the stage I expander through the outlet aa of the first heater, flows out from the outlet ac after entering the stage I expander, enters the second heater through the inlet ad, the heated air enters the inlet ah of the stage II expander through the outlet ag of the second heater, flows out from the outlet ai after entering the stage II expander, enters the third heater through the inlet aj, the heated air flows out through the outlet am of the third heater, enters the stage III expander through the inlet an, and the compressed air enters the exhaust chimney through the inlet ao after doing work in the stage III expander and is discharged from the exhaust chimney.

[0011] Furthermore, the generator is connected to a first 3S clutch and a second 3S clutch on both sides respectively, the first 3S clutch connects the II-stage expander and the generator, and the second 3S clutch connects the generator and the exhaust chimney.

[0012] Furthermore, a first 3S clutch and a second 3S clutch are connected to both sides of the generator respectively. The first 3S clutch connects the stage I expander and the generator, and the second 3S clutch connects the generator and the stage II expander.

[0013] Furthermore, the electrically heated pressure water heat storage system comprises a pressure water heating tank, an electric heating device, a pressure water cooling tank, a first variable frequency water pump and a second variable frequency water pump;

[0014] The hot water in the pressure water heating tank flows out from the outlet as and is divided into three streams after passing through the first control valve: one stream flows into the first heater inlet z and flows out from the first heater outlet y; one stream flows into the second heater inlet af and flows out from the second heater outlet ae; the other stream flows into the third heater inlet aL and flows out from the third heater outlet ak; the three streams flow out from the above three outlets y, ae and ak respectively, and after merging, they flow into the pressure water cooling tank from the inlet at through the first variable frequency water pump and flow out from the pressure water cooling tank outlet au. After passing through the second variable frequency water pump, they are divided into three streams: one stream flows in from the first cooler inlet f and flows out from the first cooler outlet e, one stream flows in from the second cooler inlet L and flows out from the second cooler outlet k, and the other stream flows in from the third cooler inlet r and flows out from the third cooler outlet q; the three streams flow out from the above outlets e, k and q respectively, and after merging, they flow into the electric heating device from the inlet ap and flow out from the outlet aq, and the above cycle is repeated.

[0015] Furthermore, the final-stage compression heat cooling system includes a cooling tower, a second control valve, a third control valve, a fourth control valve, a final-stage heat exchanger, a first check valve, a second check valve, and a circulating water pump. After the cold water flowing in from the final-stage heat exchanger inlet bc absorbs the heat of the hot air flowing in from the final-stage heat exchanger inlet v, the hot water flows out from the final-stage heat exchanger outlet av and is divided into two streams: one stream flows to the air heater inlet bd through the second control valve, and the other stream flows into the cooling tower from the cooling tower inlet aw through the third control valve. The cooled cold water merges with the water flowing from the second check valve from the first check valve, flows into the final-stage heat exchanger inlet bc again after passing through the circulating water pump and the fourth control valve, and repeats the next cycle.

[0016] Furthermore, the gas storage system includes a high-pressure gas storage tank for storing the compressed air flowing in from the inlet w and cooled by the final heat exchanger;

[0017] The first motor, the second motor, the third motor, the fourth motor, the electric heating device and the generator are all connected to the power grid via a transformer.

[0018] The beneficial effects of the utility model are:

[0019] In actual applications, this application couples and controls the air preheating system, compressed air system, air expansion power generation system, gas storage system, multi-stage compression heat recovery and utilization system, electric heating pressure water heat storage system, and final compression heat cooling system, which not only realizes the energy storage and release of the air compression system, but also can timely adjust the system according to the real-time energy fluctuations of the power grid, realizes the rapid peak regulation of the entire power grid system, and can adjust the compressor inlet temperature according to seasonal changes, making the operation of the entire system more stable. It can also operate with a phase-shifting phase under non-power generation conditions to compensate for the reactive power of the power grid, solving the problems of unstable energy input of the power system, poor adaptability to the operating environment temperature, lack of inertia, insufficient reactive power, etc. brought about by the connection of new energy to the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the first embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of the second embodiment of the present invention;

[0022] Figure 1: 1. Air preheater, 2. I stage compressor, 3. First motor, 4. II stage compressor, 5. Second motor, 6. Third motor, 7. III stage compressor, 8. Fourth motor, 9. IV stage compressor, 10. First cooler, 11. Second cooler, 12. Third cooler, 13. Electric heating device, 14. Pressure water heating tank, 15. First control valve, 16. First variable frequency water pump, 17. Pressure water cooling tank, 18. Second variable frequency water pump, 19. First heater, 2 0. Second heater, 21. Third heater, 22. Stage I expander, 23. Stage II expander, 24. First 3S clutch, 25. Generator, 26. Second 3S clutch, 27. Stage III expander, 28. Exhaust stack, 29. Transformer, 30. Power grid, 31. Third control valve, 32. Cooling tower, 33. First check valve, 34. Second check valve, 35. Circulating water pump, 36. Fourth control valve, 37. Final heat exchanger, 38. Second control valve, 39. High-pressure gas storage tank;

[0023] a~be are the import and export of each module. DETAILED DESCRIPTION

[0024] Example 1:

[0025] like Figure 1 As shown, a multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression includes an air preheating system, an air compression system, an air expansion power generation system, an air storage system, a multi-stage compression heat recovery and utilization system, an electrically heated pressure water heat storage system, and a final compression heat cooling system. The air preheating system is used to preheat the air at the compressor inlet, the compressed air system is used to pressurize the ambient air, the multi-stage compression heat recovery and utilization system is used to recover and utilize the compression heat of each stage by using a heat exchanger, the air storage system is used to store the pressurized high-pressure air, the air expansion power generation system is used to utilize the high-pressure air to enter the turbine for expansion and work, and drive the generator to generate electricity, the electrically heated pressure water heat storage system is used to recover the heat of the compressed air and control the heating power by connecting to the power grid to control the water temperature fluctuation, and the final compression heat cooling system is used to heat the compressor inlet air under different demand conditions and cool the compressed air before entering the storage tank;

[0026] The air preheating system includes an air preheater 1. Cold air enters the air preheater 1 from inlet a, is preheated by the air preheater 1, and then enters the compressed air system from outlet b.

[0027] The compressed air system includes a section I compressor 2, a first motor 3, a section II compressor 4, a second motor 5, a third motor 6, a section III compressor 7, a fourth motor 8, and a section IV compressor 9; the multi-stage compression heat recovery and utilization system includes a first cooler 10, a second cooler 11 and a third cooler 12; the preheated air enters the section I compressor 2 from outlet b, the outlet c of the section I compressor 2 is connected to the inlet d of the first cooler 10, the outlet g of the first cooler 10 is connected to the inlet h of the section II compressor 4, the outlet i of the section II compressor 4 is connected to the inlet j of the second cooler 11, the outlet m of the second cooler 11 is connected to the inlet n of the section III compressor 7, the outlet o of the section III compressor 7 is connected to the inlet p of the third cooler 12, the outlet s of the third cooler 12 is connected to the inlet t of the section IV compressor 9, the outlet u of the section IV compressor 9 is connected to the inlet v of the last stage heat exchanger 37 of the final stage compression heat cooling system, and the compressed air flows into the air storage system after releasing heat. The compressors of each section form a multi-stage series air compression system;

[0028] The air expansion power generation system includes a stage I expander 22, a stage II expander 23, a stage III expander 27, an exhaust chimney 28 and a generator 25, with the first 3S clutch 24 and the second 3S clutch 26 connected to the two sides of the generator 25 respectively; the electrically heated pressure water heat storage system includes a first heater 19, a second heater 20 and a third heater 21; high-pressure air enters the first heater 19 through the inlet x, enters the inlet ab of the stage I expander 22 through the outlet aa of the first heater 19, flows out from the outlet ac after entering the stage I expander 22, enters the second heater 20 through the inlet ad, the heated air enters the inlet ah of the stage II expander 23 through the outlet ag of the second heater 20, flows out from the outlet ai after entering the stage II expander 23, enters the third heater 21 through the inlet aj, the heated air flows out through the outlet am of the third heater 21, enters the stage III expander 27 through the inlet an, and the compressed air enters the exhaust chimney 28 through the inlet ao after performing work in the stage III expander 27 and is discharged from the exhaust chimney 28;

[0029] The two sides of the generator 25 are connected to a first 3S clutch 24 and a second 3S clutch 26, respectively. The first 3S clutch 24 connects the II-stage expander 23 and the generator 25, and the second 3S clutch 26 connects the generator 25 and the exhaust chimney 28.

[0030] The electrically heated pressure water heat storage system comprises a pressure water heating tank 14, an electric heating device 15, a pressure water cooling tank 17, a first variable frequency water pump 16 and a second variable frequency water pump 18;

[0031] The hot water in the pressure water heating tank 16 flows out from the outlet as and is divided into three streams after passing through the first control valve 15: one stream flows into the inlet z of the first heater 19 and flows out from the outlet y of the first heater 19; one stream flows into the inlet af of the second heater 20 and flows out from the outlet ae of the second heater 20; the other stream flows into the inlet aL of the third heater 21 and flows out from the outlet ak of the third heater 21. The three streams flow out from the above three outlets y, ae and ak respectively, and then merge and flow into the pressure water cooling tank 17 through the inlet at through the first variable frequency water pump 16. , flows out through the outlet au of the pressure water cooling tank 17, and is divided into three streams after passing through the second variable frequency water pump 18. One stream flows in from the inlet f of the first cooler 10 and flows out from the outlet e of the first cooler 10, one stream flows in from the inlet L of the second cooler 11 and flows out from the outlet k of the second cooler 11, and the other stream flows in from the inlet r of the third cooler 12 and flows out from the outlet q of the third cooler 12; the three streams flow out from the above outlets e, k and q respectively, and after merging, flow into the electric heating device 13 from the inlet ap and flow out from the outlet aq, and the above cycle is repeated;

[0032] The final stage compression heat cooling system includes a cooling tower 32, a second control valve 38, a third control valve 31, a fourth control valve 36, a final stage heat exchanger 37, a first check valve 33, a second check valve 34, and a circulating water pump 35. After the cold water flowing in from the inlet bc of the final stage heat exchanger 37 absorbs the heat of the hot air flowing in from the inlet v of the final stage heat exchanger 37, the hot water flows out from the outlet av of the final stage heat exchanger 37 and is divided into two streams: one stream flows to the inlet bd of the air heater 1 through the second control valve 38, and the other stream flows into the cooling tower 32 from the inlet aw of the cooling tower 32 through the third control valve 31. The cooled cold water merges with the water flowing from the second check valve 34 through the first check valve 33, flows through the circulating water pump 35 and the fourth control valve 36, and flows again into the inlet bc of the final stage heat exchanger 37, repeating the next cycle.

[0033] The gas storage system includes a high-pressure gas storage tank 39 for storing the compressed air flowing in from the inlet w and cooled by the final heat exchanger 37;

[0034] The first motor 3 , the second motor 5 , the third motor 6 , the fourth motor 8 , the electric heater 13 , the electric heater 15 and the generator 25 are all connected to a power grid 30 via a transformer 29 .

[0035] Example 2:

[0036] like Figure 1As shown, a multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression includes an air preheating system, an air compression system, an air expansion power generation system, an air storage system, a multi-stage compression heat recovery and utilization system, an electrically heated pressure water heat storage system, and a final compression heat cooling system. The air preheating system is used to preheat the air at the compressor inlet, the compressed air system is used to pressurize the ambient air, the multi-stage compression heat recovery and utilization system is used to recover and utilize the compression heat of each stage by using a heat exchanger, the air storage system is used to store the pressurized high-pressure air, the air expansion power generation system is used to utilize the high-pressure air to enter the turbine for expansion and work, and drive the generator to generate electricity, the electrically heated pressure water heat storage system is used to recover the heat of the compressed air and control the heating power by connecting to the power grid to control the water temperature fluctuation, and the final compression heat cooling system is used to heat the compressor inlet air under different demand conditions and cool the compressed air before entering the storage tank;

[0037] The air preheating system includes an air preheater 1. Cold air enters the air preheater 1 from inlet a, is preheated by the air preheater 1, and then enters the compressed air system from outlet b.

[0038] The compressed air system includes a section I compressor 2, a first motor 3, a section II compressor 4, a second motor 5, a third motor 6, a section III compressor 7, a fourth motor 8, and a section IV compressor 9; the multi-stage compression heat recovery and utilization system includes a first cooler 10, a second cooler 11 and a third cooler 12; the preheated air enters the section I compressor 2 from outlet b, the outlet c of the section I compressor 2 is connected to the inlet d of the first cooler 10, the outlet g of the first cooler 10 is connected to the inlet h of the section II compressor 4, the outlet i of the section II compressor 4 is connected to the inlet j of the second cooler 11, the outlet m of the second cooler 11 is connected to the inlet n of the section III compressor 7, the outlet o of the section III compressor 7 is connected to the inlet p of the third cooler 12, the outlet s of the third cooler 12 is connected to the inlet t of the section IV compressor 9, the outlet u of the section IV compressor 9 is connected to the inlet v of the last stage heat exchanger 37 of the final stage compression heat cooling system, and the compressed air flows into the air storage system after releasing heat. The compressors of each section form a multi-stage series air compression system;

[0039] The air expansion power generation system includes a stage I expander 22, a stage II expander 23, a stage III expander 27, an exhaust chimney 28 and a generator 25, with the first 3S clutch 24 and the second 3S clutch 26 connected to the two sides of the generator 25 respectively; the electrically heated pressure water heat storage system includes a first heater 19, a second heater 20 and a third heater 21; high-pressure air enters the first heater 19 through the inlet x, enters the inlet ab of the stage I expander 22 through the outlet aa of the first heater 19, flows out from the outlet ac after entering the stage I expander 22, enters the second heater 20 through the inlet ad, the heated air enters the inlet ah of the stage II expander 23 through the outlet ag of the second heater 20, flows out from the outlet ai after entering the stage II expander 23, enters the third heater 21 through the inlet aj, the heated air flows out through the outlet am of the third heater 21, enters the stage III expander 27 through the inlet an, and the compressed air enters the exhaust chimney 28 through the inlet ao after performing work in the stage III expander 27 and is discharged from the exhaust chimney 28;

[0040] The two sides of the generator 25 are connected to a first 3S clutch 24 and a second 3S clutch 26, respectively. The first 3S clutch 24 connects the I-stage expander 22 and the generator 25, and the second 3S clutch 26 connects the generator 25 and the II-stage expander 23.

[0041] The electrically heated pressure water heat storage system comprises a pressure water heating tank 14, an electric heating device 15, a pressure water cooling tank 17, a first variable frequency water pump 16 and a second variable frequency water pump 18;

[0042] The hot water in the pressure water heating tank 16 flows out from the outlet as and is divided into three streams after passing through the first control valve 15: one stream flows into the inlet z of the first heater 19 and flows out from the outlet y of the first heater 19; one stream flows into the inlet af of the second heater 20 and flows out from the outlet ae of the second heater 20; the other stream flows into the inlet aL of the third heater 21 and flows out from the outlet ak of the third heater 21. The three streams flow out from the above three outlets y, ae and ak respectively, and then merge and flow into the pressure water cooling tank 17 through the inlet at through the first variable frequency water pump 16. , flows out through the outlet au of the pressure water cooling tank 17, and is divided into three streams after passing through the second variable frequency water pump 18. One stream flows in from the inlet f of the first cooler 10 and flows out from the outlet e of the first cooler 10, one stream flows in from the inlet L of the second cooler 11 and flows out from the outlet k of the second cooler 11, and the other stream flows in from the inlet r of the third cooler 12 and flows out from the outlet q of the third cooler 12; the three streams flow out from the above outlets e, k and q respectively, and after merging, flow into the electric heating device 13 from the inlet ap and flow out from the outlet aq, and the above cycle is repeated;

[0043] The final stage compression heat cooling system includes a cooling tower 32, a second control valve 38, a third control valve 31, a fourth control valve 36, a final stage heat exchanger 37, a first check valve 33, a second check valve 34, and a circulating water pump 35. After the cold water flowing in from the inlet bc of the final stage heat exchanger 37 absorbs the heat of the hot air flowing in from the inlet v of the final stage heat exchanger 37, the hot water flows out from the outlet av of the final stage heat exchanger 37 and is divided into two streams: one stream flows to the inlet bd of the air heater 1 through the second control valve 38, and the other stream flows into the cooling tower 32 from the inlet aw of the cooling tower 32 through the third control valve 31. The cooled cold water merges with the water flowing from the second check valve 34 through the first check valve 33, flows through the circulating water pump 35 and the fourth control valve 36, and flows again into the inlet bc of the final stage heat exchanger 37, repeating the next cycle.

[0044] The gas storage system includes a high-pressure gas storage tank 39 for storing the compressed air flowing in from the inlet w and cooled by the final heat exchanger 37;

[0045] The first motor 3 , the second motor 5 , the third motor 6 , the fourth motor 8 , the electric heater 13 , the electric heater 15 and the generator 25 are all connected to a power grid 30 via a transformer 29 .

[0046] This application couples and controls the air preheating system, the compressed air system, the air expansion power generation system, the gas storage system, the multi-stage compression heat recovery and utilization system, the electric heating pressure water heat storage system, and the final compression heat cooling system, which not only realizes the energy storage and release of the air compression system, but also can timely adjust the system according to the real-time energy fluctuations of the power grid, realizes the rapid peak regulation of the entire power grid system, and can adjust the compressor inlet temperature according to seasonal changes, making the operation of the entire system more stable. It can also operate with a phase regulator under non-power generation conditions to compensate for the reactive power of the power grid, solving the problems of unstable energy input of the power system, poor adaptability to the operating environment temperature, lack of inertia, insufficient reactive power, etc. brought about by the connection of new energy to the grid.

[0047] The specific embodiments described herein are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods without departing from the scope of the present invention.

Claims

1. A multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression, characterized by: It includes an air preheating system, a compressed air system, an air expansion power generation system, an air storage system, a multi-stage compression heat recovery and utilization system, an electric heating pressure water heat storage system, and a final compression heat cooling system. The air preheating system is used to preheat the air at the compressor inlet, the compressed air system is used to pressurize the ambient air, the multi-stage compression heat recovery and utilization system is used to recover and utilize the compression heat of each section using a heat exchanger, the air storage system is used to store pressurized high-pressure air, the air expansion power generation system is used to utilize the high-pressure air to enter the turbine to expand and perform work, driving the generator to generate electricity, the electric heating pressure water heat storage system is used to recover the heat of compressed air, and control the heating power and water temperature fluctuations by connecting to the power grid, and the final compression heat cooling system is used to heat the compressor inlet air under different demand conditions and cool the compressed air before entering the storage tank.

2. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 1 is characterized in that: The air preheating system includes an air preheater. Cold air enters the air preheater from inlet a, is preheated by the air preheater, and then enters the compressed air system from outlet b.

3. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 2 is characterized in that: The compressed air system includes a stage I compressor, a first motor, a stage II compressor, a second motor, a third motor, a stage III compressor, a fourth motor, and a stage IV compressor; the multi-stage compression heat recovery and utilization system includes a first cooler, a second cooler and a third cooler; the preheated air enters the stage I compressor from outlet b, the outlet c of the stage I compressor is connected to the inlet d of the first cooler, the outlet g of the first cooler is connected to the inlet h of the stage II compressor, the outlet i of the stage II compressor is connected to the inlet j of the second cooler, the outlet m of the second cooler is connected to the inlet n of the stage III compressor, the outlet o of the stage III compressor is connected to the inlet p of the third cooler, the outlet s of the third cooler is connected to the inlet t of the stage IV compressor, the outlet u of the stage IV compressor is connected to the inlet v of the last stage heat exchanger of the last stage compression heat cooling system, and the compressed air flows into the air storage system after releasing heat. The compressors of each stage form a multi-stage series air compression system.

4. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 3 is characterized in that: The air expansion power generation system includes a stage I expander, a stage II expander, a stage III expander, an exhaust chimney and a generator, and the first 3S clutch and the second 3S clutch are connected to the two sides of the generator respectively; the electrically heated pressure water heat storage system includes a first heater, a second heater and a third heater; high-pressure air enters the first heater through the inlet x, enters the inlet ab of the stage I expander through the outlet aa of the first heater, flows out from the outlet ac after entering the stage I expander, enters the second heater through the inlet ad, the heated air enters the inlet ah of the stage II expander through the outlet ag of the second heater, flows out from the outlet ai after entering the stage II expander, enters the third heater through the inlet aj, the heated air flows out through the outlet am of the third heater, enters the stage III expander through the inlet an, and the compressed air enters the exhaust chimney through the inlet ao after doing work in the stage III expander and is discharged from the exhaust chimney.

5. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 4 is characterized in that: The two sides of the generator are respectively connected to a first 3S clutch and a second 3S clutch, the first 3S clutch connects the II-stage expander and the generator, and the second 3S clutch connects the generator and the exhaust chimney.

6. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 4 is characterized in that: The two sides of the generator are respectively connected to a first 3S clutch and a second 3S clutch, the first 3S clutch connects the I-stage expander and the generator, and the second 3S clutch connects the generator and the II-stage expander.

7. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 4 is characterized in that: The electrically heated pressure water heat storage system comprises a pressure water heating tank, an electric heating device, a pressure water cooling tank, a first variable frequency water pump and a second variable frequency water pump; The hot water in the pressure water heating tank flows out from the outlet as and is divided into three streams after passing through the first control valve: one stream flows into the first heater inlet z and flows out from the first heater outlet y; one stream flows into the second heater inlet af and flows out from the second heater outlet ae; the other stream flows into the third heater inlet aL and flows out from the third heater outlet ak; the three streams flow out from the above three outlets y, ae and ak respectively, and after merging, they flow into the pressure water cooling tank from the inlet at through the first variable frequency water pump and flow out from the pressure water cooling tank outlet au. After passing through the second variable frequency water pump, they are divided into three streams: one stream flows in from the first cooler inlet f and flows out from the first cooler outlet e, one stream flows in from the second cooler inlet L and flows out from the second cooler outlet k, and the other stream flows in from the third cooler inlet r and flows out from the third cooler outlet q; the three streams flow out from the above outlets e, k and q respectively, and after merging, they flow into the electric heating device from the inlet ap and flow out from the outlet aq, and the above cycle is repeated.

8. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 7 is characterized in that: The final stage compression heat cooling system includes a cooling tower, a second control valve, a third control valve, a fourth control valve, a final stage heat exchanger, a first check valve, a second check valve, and a circulating water pump. After the cold water flowing in from the final stage heat exchanger inlet bc absorbs the heat of the hot air flowing in from the final stage heat exchanger inlet v, the hot water flows out from the final stage heat exchanger outlet av and is divided into two streams: one stream flows to the air heater inlet bd through the second control valve, and the other stream flows into the cooling tower from the cooling tower inlet aw through the third control valve. The cooled cold water merges with the water flowing from the second check valve through the first check valve, flows through the circulating water pump and the fourth control valve, and flows into the final stage heat exchanger inlet bc again, repeating the next cycle.

9. The multifunctional medium-temperature pressure storage system based on dual-clutch four-stage compression according to claim 8, characterized in that: The gas storage system includes a high-pressure gas storage tank for storing the compressed air flowing in from the inlet w and cooled by the final heat exchanger; The first motor, the second motor, the third motor, the fourth motor, the electric heating device and the generator are all connected to the power grid via a transformer.

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