Multifunctional high-temperature pressure storage system based on double-clutch three-stage compression

Abstract

The invention relates to the technical field of compressed air energy storage, in particular to a multifunctional high-temperature pressure storage system based on double-clutch three-stage compression. Comprising an air preheating system, a compressed air system, an air expansion power generation system, an air storage system, a multi-stage compression heat recycling and fused salt heat storage system, an electric heating pressure water heat storage system and a final-stage compression heat cooling system. According to the invention, air temperature adjustment of an inlet of the compressor and energy storage and release in the air compression and expansion process in a cold environment are realized, heat and electricity conversion can be carried out on the system in time according to real-time energy fluctuation of a power grid, rapid peak regulation of the whole power grid system is realized, and powerful support is provided for effective utilization of energy of the whole power grid system. A 3S clutch is adopted between the generator and the turbine of the system, the generator can also be operated as a phase modifier in a non-power-generation period, a black start function can be flexibly realized, and the system has the characteristic of a multifunctional auxiliary service function of a power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression. Background Art

[0002] In recent years, my country's installed capacity and power generation of renewable energy power generation have shown an upward trend year by year. By the end of 2021, in terms of installed capacity, the total installed capacity of electricity in the country is about 2.38 billion kW, of which hydropower, wind power, photovoltaic power generation, and biomass power generation are 1.063 billion kW, accounting for 44.66% of the total installed capacity; according to statistics from the Electric Power Department of the National Energy Administration, the country's new installed power generation capacity in 2022 will be 199.74 million kW, of which new energy installed capacity, mainly wind power and photovoltaics, will exceed 125.04 million kW. It can be seen that for a long time in the future, vigorously developing new energy such as wind and light will become a top priority for building a new power system.

[0003] The access of new energy has brought many uncertainties to the safe and stable operation of the power grid. The access of distributed new energy will, on the one hand, reduce the connection between the substation sites in the original plan, reduce the mutual supply between the substations and the reliability of the connection between stations; on the other hand, it will enhance the flexibility of the power supply of the distribution network, but at the same time make the wiring mode in the distribution network more complicated, reduce the transfer and load capacity between lines, and even affect the network loss and the power factor of the line.

[0004] In order to solve the problems brought about by the connection of new energy to the grid, 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. Summary of the invention

[0005] The object of the present invention is to provide a multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression to solve the above-mentioned technical problems.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression, characterized in that it includes an air preheating system, a compressed air system, an air expansion power generation system, a gas storage system, a multi-stage compression heat recovery and molten salt heat storage 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 compressor inlet air, the compressed air system is used to pressurize the ambient air, the air expansion power generation system is used to use the high-pressure air to enter the turbine to expand and do work, the gas storage system is used to store the pressurized high-pressure air, the multi-stage compression heat recovery and molten salt heat storage system is used to recover and utilize the low-temperature section compression heat and the high-temperature section compression heat, and store and utilize the air compression heat, the electric heating pressure water heat storage system is used to recover the outlet compressed air heat of the molten salt heat storage system, and the final compression heat cooling system is used to heat the compressor inlet air or cool the final compressor high-pressure air under different demand conditions.

[0008] Furthermore, the air preheating system includes an air preheater, cold air enters the air preheater from the inlet inlet, the preheated air enters the I-stage compressor from the ax inlet, heating water enters the air preheater from the final heat exchanger outlet at, passes through the second control valve, enters the air preheater from the air preheater inlet aw, flows out from the ay outlet, and enters the final compression heat cooling system through the second check valve.

[0009] Furthermore, the compressed air system includes a first motor, a second motor, a stage II compressor, a third motor, a stage III compressor, a two-stage first cooler and a second cooler, a two-stage third cooler and a fourth cooler, wherein the first motor is used to drive the stage I compressor, the second motor is used to drive the stage II compressor, and the third motor is used to drive the stage III compressor. The outlet a of the stage I compressor is connected to the inlet b of the first cooler, the outlet g of the second 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 third cooler, the outlet o of the fourth cooler is connected to the inlet p of the stage III compressor, and the outlet q of the stage III compressor is connected to the inlet r of the final heat exchanger. After releasing heat, the compressed air flows into the high-pressure air storage tank from the inlet s.

[0010] Further, the air expansion power generation system includes a stage I expander, a stage II expander, an exhaust chimney, a generator, a first heater and a second heater of two stages, and a third heater and a fourth heater of two stages;

[0011] The gas storage system includes a high-pressure gas storage tank for storing compressed air flowing in from the inlet s and cooled by the final heat exchanger;

[0012] A first 3S clutch is connected between interface 1 of the generator and the stage I expander, and a second 3S clutch is connected between interface 2 of the generator and the stage II expander. The air in the high-pressure storage tank enters the first heater through inlet t, enters the inlet z of the stage I expander through outlet y of the second heater, flows out from outlet aa after entering the stage I expander, enters the fourth heater through inlet ab of the third heater, and the heated air enters the inlet ah of the stage II expander through outlet ag of the fourth heater, and is discharged from the exhaust chimney after entering the stage II expander.

[0013] Furthermore, the multi-stage compression heat recovery and molten salt heat storage system includes a molten salt hot tank, a molten salt cold tank, a first variable frequency molten salt pump, and a second variable frequency molten salt pump. The molten salt in the molten salt hot tank is divided into two streams after flowing out from the outlet aj: one stream flows into the second heater inlet x and flows out from the outlet w, and the other stream flows into the fourth heater inlet af and flows out from the outlet ae. The two streams of molten salt flow out from the outlet w and the outlet ae respectively, and after merging, they pass through the first variable frequency molten salt pump, flow into the molten salt cold tank from the inlet ak of the molten salt cold tank, and flow out from the molten salt cold tank outlet aL. After passing through the second variable frequency molten salt pump, they are divided into two streams, one stream flows in from the first cooler inlet d and flows out from the outlet c, and the other stream flows in from the third cooler inlet L and flows out from the outlet k. The two streams of molten salt flow out from the above two outlets c and outlet k respectively, and after merging, they flow into the molten salt hot tank from the molten salt hot tank inlet ai, and repeat the above cycle.

[0014] Furthermore, the electric heating pressure water heat storage system includes an electric heating device, a pressure water hot tank, a first control valve, a first variable frequency water pump, a pressure water cooling tank, and a second variable frequency water pump. The hot water in the pressure water hot tank flows out from the pressure water hot tank outlet an, and is divided into two streams after passing through the first control valve. One stream flows into the first heater inlet v and flows out from the first heater outlet u, and the other stream flows into the third heater inlet ad and flows out from the third heater outlet ac. The two streams flow out from the above-mentioned two outlets u and outlet ac respectively, and after merging, flow into the pressure water cooling tank from the inlet ao through the first variable frequency water pump, and flow out from the pressure water cooling tank outlet ap. After passing through the second variable frequency water pump, it is divided into two streams, one stream flows into the second cooler inlet f and flows out from the second cooler outlet e, and the other stream flows into the fourth cooler inlet n and flows out from the fourth cooler outlet m. The two streams flow out from the above-mentioned two outlets e and outlet m respectively, and after merging, flow into the electric heating device from the inlet au and flow out from the outlet av, and the above cycle is repeated.

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

[0016] The first motor, the second motor, the third motor and the electric heating device are all connected to the power grid via a transformer.

[0017] In practical applications, the present 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 and the molten salt heat storage system, the electric heating pressure water heat storage system, and the final compression heat cooling system. It 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 machine under non-power generation conditions to compensate for the reactive power of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression;

[0019] Among them, 1. I stage compressor, 2. first motor, 3. second motor, 4. II stage compressor, 5. third motor, 6. III stage compressor, 7. first cooler, 8. second cooler, 9. third cooler, 10. fourth cooler, 11. molten salt hot tank, 12. molten salt cold tank, 13. first variable frequency molten salt pump, 14. second variable frequency molten salt pump, 15. electric heating device, 16. pressure water hot tank, 17. first control valve, 18. first variable frequency water pump, 19. pressure water cooling tank, 20. second variable frequency water pump, 21. first Heater, 22. Second heater, 23. Third heater, 24. Fourth heater, 25. I-stage expander, 26. II-stage expander, 27. Exhaust chimney, 28. Generator, 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, 40. First 3S clutch, 41. Second 3S clutch, 42. Air preheater;

[0020] a~bo are the import and export. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Example 1

[0023] refer to Figure 1As shown, a multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression is characterized in that 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, a molten salt heat storage system, an electric heating pressure water heat storage system, and a final compression heat cooling system; the air preheating system can preheat the compressor inlet air to ensure the stable operation of the system under cold conditions; the compressed air system is used to pressurize the ambient air, and the air expansion power generation system uses high-pressure air to enter the turbine to expand and do work, thereby driving the generator to generate electricity, and the generator can also operate as a phase regulator under non-power generation conditions. Flexible operation of the black start process can be achieved when the power grid fails; the gas storage system is used to store pressurized high-pressure air, the multi-stage compression heat recovery and utilization system uses heat exchangers of different forms and media to recover and utilize the compression heat of the low-temperature section and the compression heat of the high-temperature section, the molten salt heat storage system uses a molten salt-air heat exchanger group to store and utilize the air compression heat, the electrically heated pressure water heat storage system is used to recover the outlet compressed air heat of the molten salt heat storage system, and realize stable hot water heating by connecting to the power grid to control the heating power, and the final stage compression heat cooling system is used to heat the compressor inlet air or cool the final stage compressor high-pressure air under different demand conditions.

[0024] refer to Figure 1 As shown, in the air preheating system, cold air enters the air preheater 42 from "inlet" and enters the I-stage compressor 1 from ax. The heating water enters the sick cold air from the outlet at of the final heat exchanger 37 through the second control valve 38 and the inlet aw of the air preheater 42, then flows out from ay and enters the compression heat cooling system through the second check valve 34.

[0025] refer to Figure 1 As shown, the compressed air system has three stages, including a stage I compressor 1 and a first motor 2, a second motor 3 and a stage II compressor 4, and a third motor 5 and a stage III compressor 6. The outlet a of the stage I compressor 1 is connected to the inlet b of the first cooler 7, the outlet g of the second cooler 8 is connected to the inlet h of the stage II compressor 4, the outlet i of the stage II compressor 4 is connected to the inlet j of the third cooler 9, the outlet o of the fourth cooler 10 is connected to the inlet p of the stage III compressor 6, and the outlet q of the stage III compressor 6 is connected to the inlet r of the final heat exchanger 37. After releasing heat, the compressed air flows into the high-pressure air storage tank 39 from the inlet s. The compressors of each stage form a multi-stage series air compression system.

[0026] refer to Figure 1 As shown, the air expansion power generation system includes a stage I expander 25, a stage II expander 26, an exhaust chimney 27, a generator 28, a first heater 21 and a second heater 22 of two stages, a third heater 23 and a fourth heater 24 of two stages;

[0027] The gas storage system includes a high-pressure gas storage tank 39, which is used to store the compressed air flowing in from the inlet s and cooled by the final heat exchanger 37;

[0028] A first 3S clutch 40 is connected between interface 1 of the generator 28 and the stage I expansion machine 25, and a second 3S clutch 41 is connected between interface 2 of the generator 28 and the stage II expansion machine 26. The air in the high-pressure storage tank 39 enters the first heater 21 through the inlet t, enters the inlet z of the stage I expansion machine 25 through the outlet y of the second heater 22, flows out from the outlet aa after entering the stage I expansion machine 25, enters the fourth heater 24 through the inlet ab of the third heater 23, and the heated air enters the inlet ah of the stage II expansion machine 26 through the outlet ag of the fourth heater 24, and is discharged from the exhaust chimney 27 after entering the stage II expansion machine 26.

[0029] In this embodiment, the temperature of the compression heat in the high-temperature section is ≥350°C, which is suitable for molten salt heat storage recovery, utilization and storage systems; the two sides of the generator 28 are connected to the high-pressure cylinder 25 by a 3S clutch 40, and the low-pressure cylinder 26 by a 3S clutch 41. Under non-power generation conditions, the generator is disconnected from the high- and low-pressure cylinders through two 3S clutches, and can be operated as a phase regulator to output reactive power for the power system and meet the reactive power compensation requirements of the power system. And during the black start of the system, by switching the 3S clutch 40 off, compressed air can be directly injected into the low-pressure cylinder to achieve flexible control operation of black start;

[0030] The generator 28 is driven by the I-stage expander 25 and the II-stage expander 26 to output electric energy to the power grid 30; the high-pressure air is released from the high-pressure gas storage tank 39, heated to high pressure and high temperature by pressurized water and molten salt, and enters the high-pressure cylinder of the expander; the exhaust gas is then heated to medium pressure and high temperature by pressurized water and molten salt, and enters the low-pressure cylinder of the expander to generate electricity.

[0031] refer to Figure 1As shown, the multi-stage compression heat recovery and molten salt heat storage system includes a molten salt hot tank 11, a molten salt cold tank 12, a first variable frequency molten salt pump 13, and a second variable frequency molten salt pump 14. The molten salt in the molten salt hot tank 11 is divided into two streams after flowing out from the outlet aj: one stream flows into the inlet x of the second heater 22 and flows out from the outlet w, and the other stream flows into the inlet af of the fourth heater 24 and flows out from the outlet ae. The two streams of molten salt flow out from the outlet w and the outlet ae respectively, and after merging, they pass through the first variable frequency molten salt pump 13, flow into the molten salt cold tank 12 from the inlet ak of the molten salt cold tank 12, and flow out from the outlet aL of the molten salt cold tank 12. After passing through the second variable frequency molten salt pump 14, they are divided into two streams, one stream flows in from the inlet d of the first cooler 7 and flows out from the outlet c, and the other stream flows in from the inlet L of the third cooler 9 and flows out from the outlet k. Out, two streams of molten salt flow out from the above two outlets c and outlet k respectively, and after merging, flow into the molten salt hot tank 11 from the inlet ai of the molten salt hot tank 11, and repeat the above cycle; in this embodiment, the second cooler 8, the fourth cooler 10, the first heater 21, and the third heater 23 are pressure water-air heat exchangers for recovering and utilizing the compression heat of the low temperature section ≤180°C, the first cooler 7, the third cooler 9, the second heater 22, and the fourth heater 24 are molten salt-air heat exchangers for recovering and utilizing the compression heat of the high temperature section ≥350°C, wherein the second cooler 8 and the first heater 21 are cross-flow heat exchangers, and the first cooler 7, the third cooler 9, the fourth cooler 10, the second heater 22, the third heater 23, and the fourth heater 24 are hairpin heat exchangers.

[0032] refer to Figure 1As shown, the electric heating pressure water heat storage system includes an electric heating device 15, a pressure water hot tank 16, a first control valve 17, a first variable frequency water pump 18, a pressure water cooling tank 19, and a second variable frequency water pump 20. The hot water in the pressure water hot tank 16 flows out from the pressure water hot tank 16 outlet an, and is divided into two streams after passing through the first control valve 17. One stream flows into the inlet v of the first heater 21 and flows out from the outlet u of the first heater 21, and the other stream flows into the inlet ad of the third heater 23 and flows out from the outlet ac of the third heater 23. The two streams flow out from the above two outlets u and outlet ac respectively, and after merging, they flow into the pressure water cooling tank 19 from the inlet ao through the first variable frequency water pump 18, and flow out from the outlet ap of the pressure water cooling tank 19. After passing through the second variable frequency water pump 20, they are divided into two streams, one stream flows into the second cooler 8 from the inlet One stream flows in from the inlet f and flows out from the outlet e of the second cooler 8, and the other stream flows in from the inlet n of the fourth cooler 10 and flows out from the outlet m of the fourth cooler 10. The two water flows flow out from the above-mentioned two outlets e and outlet m respectively, and after merging, flow into the electric heating device 15 from the inlet au and flow out from the outlet av, and repeat the above cycle; in this embodiment, heat exchange is carried out through the second cooler 8, the fourth cooler 10, the first heater 21, and the third heater 23; the electric heating device 15 is installed before the inlet am of the pressure water heating tank 16, heats the pressure water flowing out from the outlet m of the fourth cooler 10 during the low electricity consumption period, and stores it in the pressure water heating tank 16, so as to realize stable heat supply and have the characteristics of thermoelectric decoupling; the heat stored in the pressure water heating tank 16 is used to heat the high-pressure air coming out of the gas storage reservoir 39.

[0033] refer to Figure 1 As shown, 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 as of the final stage heat exchanger 37 absorbs the heat of the hot air flowing in from the inlet r of the final stage heat exchanger 37, the hot water flows out from the outlet at of the final stage heat exchanger 37 and is divided into two streams, one of which flows to the inlet aw of the hole opener heater 42 through the second control valve 38, and the other flows to the cooling tower 3 through the third control valve 31. The inlet aq flows into the cooling tower 32, and the cooled cold water flows out from the outlet bb of the cooling tower 32, passes through the first check valve 33 and merges with the water from the second check valve 34, and flows into the inlet as of the final heat exchanger 37 again after passing through the circulating water pump 35 and the fourth control valve 36, and repeats the next cycle; in this embodiment, in the cold winter period, the outlet at of the final heat exchanger 37 is branched through the branch of the second control valve 38, and enters the air preheater 42 from the inlet aw of the air preheater 42, so as to heat the inlet air, and maintain the system in a stable working condition;

[0034] The first motor 2, the second motor 3, the third motor 5 and the electric heating device 15 are all connected to the power grid 30 via a transformer 29;

[0035] In this embodiment, a two-stage compression heat recovery heat exchanger group is arranged after the stage I compressor 1 and the stage II compressor 4, namely, a first cooler 7, a second cooler 8 group and a third cooler 9, a fourth cooler 10 group. The heat of the first cooler 7 and the third cooler 9 in the high-temperature section and the heat of the second cooler 8 and the fourth cooler 10 in the low-temperature section are stored in the molten salt hot tank 11 and the pressure water hot tank 16 respectively; the high-pressure air compressed in three stages is cooled by the final heat exchanger 37 and then stored in the high-pressure gas storage tank 39.

[0036] Among them, the main circulation loop of the final stage compression heat cooling system is: 31→32→33→35→36→37→31;

[0037] The secondary cycle (i.e. preheating cycle) of the final stage compression heat cooling system is: 37→38→42→34→35→36→37.

[0038] 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 in similar ways without departing from the scope of the present invention.

Claims

1. A multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression, characterized in that: It includes an air preheating system, a compressed air system, an air expansion power generation system, a gas storage system, a multi-stage compression heat recovery and molten salt heat storage 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 compressor inlet air, the compressed air system is used to pressurize the ambient air, the air expansion power generation system is used to utilize the high-pressure air to enter the turbine to expand and do work, the gas storage system is used to store the pressurized high-pressure air, the multi-stage compression heat recovery and molten salt heat storage system is used to recover and utilize the low-temperature section compression heat and the high-temperature section compression heat, and store and utilize the air compression heat, the electric heating pressure water heat storage system is used to recover the outlet compressed air heat of the molten salt heat storage system, and the final compression heat cooling system is used to heat the compressor inlet air or cool the final compressor high-pressure air under different demand conditions.

2. A multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression according to claim 1, characterized in that: The air preheating system includes an air preheater. Cold air enters the air preheater from the inlet inlet. The preheated air enters the I-stage compressor from the ax inlet. Heating water enters the air preheater from the final heat exchanger outlet at, passes through the second control valve, enters the air preheater from the air preheater inlet aw, flows out from the ay outlet, and enters the final compression heat cooling system through the second check valve.

3. A multifunctional compressed air energy storage system according to claim 2, characterized in that: The compressed air system includes a first motor, a second motor, a stage II compressor, a third motor, a stage III compressor, a two-stage first cooler and a second cooler, a two-stage third cooler and a fourth cooler, wherein the first motor is used to drive the stage I compressor, the second motor is used to drive the stage II compressor, and the third motor is used to drive the stage III compressor. The outlet a of the stage I compressor is connected to the inlet b of the first cooler, the outlet g of the second 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 third cooler, the outlet o of the fourth cooler is connected to the inlet p of the stage III compressor, and the outlet q of the stage III compressor is connected to the inlet r of the final heat exchanger. After releasing heat, the compressed air flows into the high-pressure air storage tank from the inlet s.

4. A multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression according to claim 3, characterized in that: The air expansion power generation system comprises a stage I expander, a stage II expander, an exhaust chimney, a generator, a first heater and a second heater at two stages, and a third heater and a fourth heater at two stages; The gas storage system includes a high-pressure gas storage tank for storing compressed air flowing in from the inlet s and cooled by the final heat exchanger; A first 3S clutch is connected between interface 1 of the generator and the stage I expander, and a second 3S clutch is connected between interface 2 of the generator and the stage II expander. The air in the high-pressure storage tank enters the first heater through inlet t, enters the inlet z of the stage I expander through outlet y of the second heater, flows out from outlet aa after entering the stage I expander, enters the fourth heater through inlet ab of the third heater, and the heated air enters the inlet ah of the stage II expander through outlet ag of the fourth heater, and is discharged from the exhaust chimney after entering the stage II expander.

5. A multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression according to claim 4, characterized in that: The multi-stage compression heat recovery and molten salt heat storage system includes a molten salt hot tank, a molten salt cold tank, a first variable frequency molten salt pump, and a second variable frequency molten salt pump. The molten salt in the molten salt hot tank is divided into two streams after flowing out from the outlet aj: one stream flows into the second heater inlet x and flows out from the outlet w, and the other stream flows into the fourth heater inlet af and flows out from the outlet ae. The two streams of molten salt flow out from the outlet w and the outlet ae respectively, and after merging, they pass through the first variable frequency molten salt pump, flow into the molten salt cold tank from the inlet ak of the molten salt cold tank, and flow out from the molten salt cold tank outlet aL. After passing through the second variable frequency molten salt pump, they are divided into two streams, one stream flows in from the first cooler inlet d and flows out from the outlet c, and the other stream flows in from the third cooler inlet L and flows out from the outlet k. The two streams of molten salt flow out from the above two outlets c and outlet k respectively, and after merging, they flow into the molten salt hot tank from the molten salt hot tank inlet ai, and repeat the above cycle.

6. A multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression according to claim 5, characterized in that: The electric heating pressure water heat storage system includes an electric heating device, a pressure water hot tank, a first control valve, a first variable frequency water pump, a pressure water cooling tank, and a second variable frequency water pump. The hot water in the pressure water hot tank flows out from the pressure water hot tank outlet an, and is divided into two streams after passing through the first control valve. One stream flows into the first heater inlet v and flows out from the first heater outlet u, and the other stream flows into the third heater inlet ad and flows out from the third heater outlet ac. The two streams flow out from the above two outlets u and outlet ac respectively, and after merging, flow into the pressure water cooling tank from the inlet ao through the first variable frequency water pump, and flow out from the pressure water cooling tank outlet ap. After passing through the second variable frequency water pump, it is divided into two streams, one stream flows into the second cooler inlet f and flows out from the second cooler outlet e, and the other stream flows into the fourth cooler inlet n and flows out from the fourth cooler outlet m. The two streams flow out from the above two outlets e and outlet m respectively, and after merging, flow into the electric heating device from the inlet au and flow out from the outlet av, and the above cycle is repeated.

7. A multifunctional high-temperature pressure storage system based on dual-clutch three-stage compression according to claim 6, characterized in that: The final stage compression heat cooling system comprises 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 as absorbs the heat of the hot air flowing in from the final stage heat exchanger inlet r, the hot water flows out from the final stage heat exchanger outlet at and is divided into two streams, one stream flows to the opener heater inlet aw through the second control valve, and the other stream flows into the cooling tower from the cooling tower inlet aq through the third control valve. The cooled cold water flows out from the cooling tower outlet bb, passes through the first check valve and merges with the water flowing from the second check valve, and flows into the final stage heat exchanger inlet as again after passing through the circulating water pump and the fourth control valve, repeating the next cycle. The first motor, the second motor, the third motor and the electric heating device are all connected to the power grid via a transformer.

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