A closed compressed liquid working fluid energy storage system and method

Abstract

The present invention discloses a closed compressed liquid working fluid energy storage system, comprising: a heat storage module, provided with a first hot fluid channel and a first cold fluid channel; a first cold storage module, provided with a second hot fluid channel, a second cold fluid channel, and a third cold fluid channel, wherein the outlet of the first hot fluid channel is connected to the inlet of the second hot fluid channel, and the outlet of the second cold fluid channel is connected to the inlet of the first cold fluid channel; and a second cold storage module, provided with a third hot fluid channel and a fourth cold fluid channel, wherein the outlet of the first cold fluid channel is connected to the inlet of the third hot fluid channel, and the outlet of the fourth cold fluid channel and the outlet of the third cold fluid channel are both connected to the inlet of the first hot fluid channel. The beneficial effects of the present invention are that the working fluid storage cost is effectively reduced, and the system is applicable to a variety of working fluids including CO2, and has greater scalability and the possibility of efficiency optimization.

Description

Technical Field

[0001] The present invention belongs to the field of energy and environmental technology, and particularly relates to a closed compressed liquid working fluid energy storage system and method. Background Art

[0002] Large-scale physical energy storage technologies, represented by compressed air energy storage, have significant advantages such as large energy storage capacity, relatively high energy storage efficiency, and long equipment life, and have developed rapidly in recent years. To reduce the cost of large-scale, high-pressure compressed air storage, compressed air energy storage systems typically use underground salt caverns as their gas storage space, which brings about dependence on special geographical conditions and limits the widespread application of compressed air energy storage technology. On this basis, cooling and liquefying the compressed air to form liquid air for storage can effectively solve the dependence of compressed air energy storage technology on underground salt cavern gas storage. However, due to the low temperature of liquid air, deep cold storage is required during the energy storage process to improve its energy storage efficiency. It is still in the development stage. Liquid CO2 energy storage can significantly increase the cold storage temperature range and has the potential to improve cold storage and energy storage efficiency. Unlike compressed or liquid air energy storage, CO2 cannot be obtained directly from the environment, so liquid CO2 energy storage requires a closed cycle. The current conventional idea is to increase the operating pressure of the overall cycle of CO2 energy storage to achieve high-density storage of CO2 after energy release, but this will significantly increase the storage cost of CO2, and face the same problem as compressed air energy storage.

[0003] In view of this, a new energy storage system and method are needed to solve the above-mentioned problems faced by traditional compressed or liquid air energy storage and liquid CO2 energy storage. Summary of the Invention

[0004] Therefore, the present invention discloses a closed compressed liquid working fluid energy storage system to achieve the purpose of effectively reducing the working fluid storage cost and being applicable to a variety of working fluids including CO2, with greater scalability and efficiency optimization possibilities.

[0005] The present invention provides the following technical solution: a closed compressed liquid working fluid energy storage system, comprising: a heat storage module, provided with a first hot fluid channel and a first cold fluid channel; a first cold storage module, provided with a second hot fluid channel, a second cold fluid channel and a third cold fluid channel, the outlet of the first hot fluid channel is connected to the inlet of the second hot fluid channel, and the outlet of the second cold fluid channel is connected to the inlet of the first cold fluid channel; a second cold storage module, provided with a third hot fluid channel and a fourth cold fluid channel, the outlet of the first cold fluid channel is connected to the inlet of the third hot fluid channel, and the outlet of the fourth cold fluid channel is connected to the outlet of the third cold fluid channel and the inlet of the first hot fluid channel.

[0006] Furthermore, the closed compressed liquid working fluid energy storage system includes: a booster compressor, the outlet of the third cold fluid channel is connected to the inlet of the booster compressor; a main compressor, the outlet of the fourth cold fluid channel and the outlet of the third cold fluid channel are both connected to the inlet of the main compressor, and the outlet of the main compressor is connected to the inlet of the first hot fluid channel.

[0007] Furthermore, the closed compressed liquid working fluid energy storage system includes: a first liquid working fluid storage tank, the first liquid working fluid storage tank is provided with an inlet, a liquid outlet and a steam outlet, the outlet of the second hot fluid channel is connected to the inlet of the first liquid working fluid storage tank, the liquid outlet of the first liquid working fluid storage tank is connected to the inlet of the second cold fluid channel, and the steam outlet of the first liquid working fluid storage tank is connected to the inlet of the third cold fluid channel.

[0008] Furthermore, the closed compressed liquid working fluid energy storage system includes: a first liquid expander, the outlet of the second hot fluid channel is connected to the inlet of the first liquid expander, and the outlet of the first liquid expander is connected to the inlet of the first liquid working fluid storage tank.

[0009] Furthermore, the closed compressed liquid working fluid energy storage system includes: a first liquid working fluid pump, the liquid outlet of the first liquid working fluid storage tank is connected to the inlet of the first liquid working fluid pump, and the outlet of the first liquid expander is connected to the inlet of the second cold fluid channel.

[0010] Furthermore, the closed compressed liquid working fluid energy storage system includes: a turbine and a cooler, the outlet of the first cold fluid channel is connected to the inlet of the turbine, the outlet of the turbine is connected to the inlet of the cooler, and the outlet of the cooler is connected to the inlet of the third hot fluid channel.

[0011] Furthermore, the closed compressed liquid working fluid energy storage system includes: a second liquid expander and a refrigeration module, the outlet of the third hot fluid channel is connected to the inlet of the second liquid expander, and the outlet of the second liquid expander is connected to the inlet of the refrigeration module.

[0012] Furthermore, the closed compressed liquid working fluid energy storage system includes: a second liquid working fluid storage tank and a second liquid working fluid pump, the second liquid working fluid storage tank and the second liquid working fluid pump are respectively provided with an inlet and an outlet, the outlet of the refrigeration module is connected to the inlet of the second liquid working fluid storage tank, the outlet of the second liquid working fluid storage tank is connected to the inlet of the second liquid working fluid pump, and the outlet of the second liquid working fluid pump is connected to the inlet of the fourth cold fluid channel.

[0013] Furthermore, the closed compressed liquid working fluid energy storage method is operated by using any of the above closed compressed liquid working fluid energy storage systems.

[0014] Furthermore, the closed-loop compressed liquid working fluid energy storage method includes an energy storage mode, which includes the following steps: the liquid working fluid stored in the second liquid working fluid storage tank is drawn out through the second liquid expander and then increased in pressure, enters the fourth cold fluid channel of the second cold storage module, and stores the cold energy in the second cold storage module; the working fluid after releasing the cold energy is merged with the working fluid at the outlet of the booster compressor and then enters the main compressor for energy storage compression; the obtained compressed working fluid enters the first hot fluid channel of the heat storage module, and the released heat is stored in the heat storage module; the working fluid formed after releasing the heat enters the second hot fluid channel of the first cold storage module, absorbs the cold energy stored in the first cold storage module, and then enters the first liquid expander for expansion and depressurization, and then enters the first liquid working fluid storage tank, wherein the liquid phase part is stored in the working fluid storage tank, and the gas phase part flows back to the first cold storage module through the steam outlet of the first liquid working fluid storage tank, stores the cold energy in the first cold storage module through the third cold fluid channel, and the gas phase part after releasing the cold energy and heating enters the booster compressor to increase the pressure and then enters the main compressor for further compression.

[0015] Furthermore, the closed-loop compressed liquid working fluid energy storage method includes an energy release mode, which includes the following steps: the liquid working fluid stored in the first liquid working fluid storage tank is drawn out by the first liquid working fluid pump and then pressurized; the pressurized liquid working fluid enters the second cold fluid channel of the first cold storage module, stores the cold energy in the first cold storage module, and the pressurized liquid working fluid reheats and expands itself to form a reheated working fluid; the reheated working fluid enters the heat storage module to absorb the heat energy stored therein, and further heats up and expands to form a gaseous working fluid; the gaseous working fluid enters the turbine to expand and perform work, completing energy release, and is further cooled by the cooler to generate a cooled working fluid; the cooled working fluid enters the third hot fluid channel of the second cold storage module to absorb the cold energy stored therein, completing the cooling and liquefaction of the working fluid; the cooled and liquefied working fluid enters the second liquid expander for further expansion, and is fully cooled to a pure liquid phase by the refrigeration module and then enters the second liquid working fluid storage tank for storage.

[0016] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0017] Effectively reduce working fluid storage costs.

[0018] It is suitable for a variety of working fluids including CO2, and has greater scalability and efficiency optimization capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic diagram of a closed compressed liquid working fluid energy storage system according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the flow paths of various media in the energy storage mode of an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the flow paths of various media in the energy release mode of an embodiment of the present invention;

[0023] Reference numerals in the figure: 1. main compressor; 2. heat storage module; 3. first cold storage module; 4. first liquid expander; 5. first liquid working fluid storage tank; 6. booster compressor; 7. first liquid working fluid pump; 8. turbine; 9. cooler; 10. second cold storage module; 11. second liquid expander; 12. refrigeration module; 13. second liquid working fluid storage tank; 14. second liquid working fluid pump. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] like Figure 1 As shown, an embodiment of the present invention provides a closed compressed liquid working fluid energy storage system, including: a heat storage module 2, a first cold storage module 3 and a second cold storage module 10, the heat storage module 2 is provided with a first hot fluid channel and a first cold fluid channel; the first cold storage module 3 is provided with a second hot fluid channel, a second cold fluid channel and a third cold fluid channel, the outlet of the first hot fluid channel is connected to the inlet of the second hot fluid channel, and the outlet of the second cold fluid channel is connected to the inlet of the first cold fluid channel; the second cold storage module 10 is provided with a third hot fluid channel and a fourth cold fluid channel, the outlet of the first cold fluid channel is connected to the inlet of the third hot fluid channel, and the outlet of the fourth cold fluid channel and the outlet of the third cold fluid channel are both connected to the inlet of the first hot fluid channel.

[0027] The outlet of the second cold fluid channel of the first cold storage module 3 and the inlet and outlet of the first cold fluid channel of the thermal storage module 2 are connected in sequence to form a heat energy release channel during the energy release process; the outlet of the first hot fluid channel of the thermal storage module 2 and the inlet and outlet of the second hot fluid channel of the first cold storage module 3 are connected in sequence to form a working medium cooling and liquefaction channel and a cold energy release channel for the cold storage module.

[0028] In the embodiment of the present invention, the high-pressure working fluid obtained by energy storage compression is liquefied by cooling to form a normal-pressure or low-pressure liquid working fluid for storage. The working fluid after energy release undergoes another liquefaction process, so that both the stored and released working fluids are stored in normal-pressure or low-pressure liquid form, which can effectively reduce the working fluid storage cost. At the same time, the present invention can be applied to a variety of working fluids including CO2, and has greater scalability and efficiency optimization possibilities.

[0029] Furthermore, the closed compressed liquid working fluid energy storage system includes: a booster compressor 6 and a main compressor 1, the outlet of the third cold fluid channel of the booster compressor 6 is connected to the inlet of the booster compressor 6; the outlet of the fourth cold fluid channel and the outlet of the third cold fluid channel of the main compressor 1 are both connected to the inlet of the main compressor 1, and the outlet of the main compressor 1 is connected to the inlet of the first hot fluid channel.

[0030] Furthermore, the closed compressed liquid working fluid energy storage system includes: a first liquid working fluid storage tank 5, the first liquid working fluid storage tank 5 is provided with an inlet, a liquid outlet and a steam outlet, the outlet of the second hot fluid channel is connected to the inlet of the first liquid working fluid storage tank 5, the liquid outlet of the first liquid working fluid storage tank 5 is connected to the inlet of the second cold fluid channel, and the steam outlet of the first liquid working fluid storage tank 5 is connected to the inlet of the third cold fluid channel.

[0031] The steam outlet of the first liquid working fluid storage tank 5, the inlet and outlet of the third cold fluid channel of the first cold storage module 3, and the inlet of the booster compressor 6 are connected in sequence to form a liquefied gaseous working fluid vapor reflux and cold energy replenishment channel. The gaseous vapor releases cold energy in the third cold fluid channel of the first cold storage module 3 and refluxes to the booster compressor 6; the inlet and outlet of the main compressor 1, and the inlet and outlet of the first hot fluid channel of the heat storage module 2 are connected in sequence to form a working fluid compression and heat storage channel in the energy storage stage.

[0032] Furthermore, the closed compressed liquid working fluid energy storage system includes: a first liquid expander 4 , the outlet of the second hot fluid channel is connected to the inlet of the first liquid expander 4 , and the outlet of the first liquid expander 4 is connected to the inlet of the first liquid working fluid storage tank 5 .

[0033] The outlet of the second hot fluid channel of the first cold storage module 3, the inlet and outlet of the first liquid expander 4, and the inlet of the first liquid working medium storage tank 5 are connected in sequence to form a high-pressure liquid working medium pressure reduction, expansion and liquefaction channel, and the formed normal pressure or low pressure liquid working medium enters the first liquid working medium storage tank 5.

[0034] Furthermore, the closed compressed liquid working fluid energy storage system includes: a first liquid working fluid pump 7, the liquid outlet of the first liquid working fluid storage tank 5 is connected to the inlet of the first liquid working fluid pump 7, and the outlet of the first liquid working fluid pump 7 is connected to the inlet of the second cold fluid channel.

[0035] The outlet of the first liquid working fluid pump 7, the inlet and outlet of the second cold fluid channel of the first cold storage module 3 are connected in sequence to form a low-temperature and high-pressure liquid working fluid cold energy storage channel during the energy release process; the liquid outlet of the first liquid working fluid storage tank 5, the inlet and outlet of the first liquid working fluid pump 7 are connected in sequence to form a liquid working fluid pressurization channel during the energy release process.

[0036] Furthermore, the closed compressed liquid working fluid energy storage system includes: a turbine 8 and a cooler 9, the outlet of the first cold fluid channel is connected to the inlet of the turbine 8, the outlet of the turbine 8 is connected to the inlet of the cooler 9, and the outlet of the cooler 9 is connected to the inlet of the third hot fluid channel.

[0037] The outlet of the first cold fluid channel of the heat storage module 2, the inlet and outlet of the turbine 8, and the inlet and outlet of the cooler 9 are connected in sequence to form an energy release and work channel. After the high-pressure gaseous working medium expands and does work in the turbine 8, the working medium is cooled to room temperature through the cooler 9; the outlet of the cooler 9 and the inlet and outlet of the third hot fluid channel of the second cold storage module 10 are connected in sequence to form a cooling and liquefaction channel for the working medium after energy release.

[0038] It's important to note that the word "turbo" is a transliteration of the English word "turbine," which comes from the Latin word "turbo," meaning a rotating object. A turbine is a machine that converts the energy contained in a fluid medium into mechanical energy. This term applies not only to compressors but also to steam turbines, turbines, flue gas turbines, and expanders.

[0039] Furthermore, the closed compressed liquid working fluid energy storage system includes: a second liquid expander 11 and a refrigeration module 12, the outlet of the third hot fluid channel is connected to the inlet of the second liquid expander 11, and the outlet of the second liquid expander 11 is connected to the inlet of the refrigeration module 12.

[0040] Furthermore, the closed compressed liquid working fluid energy storage system includes: a second liquid working fluid storage tank 13 and a second liquid working fluid pump 14, the second liquid working fluid storage tank 13 and the second liquid working fluid pump 14 are respectively provided with an inlet and an outlet, the outlet of the refrigeration module 12 is connected to the inlet of the second liquid working fluid storage tank 13, the outlet of the second liquid working fluid storage tank 13 is connected to the inlet of the second liquid working fluid pump 14, and the outlet of the second liquid working fluid pump 14 is connected to the inlet of the fourth cold fluid channel.

[0041] The outlet of the third hot fluid channel of the second cold storage module 10, the inlet and outlet of the second liquid expander 11, and the inlet and outlet of the refrigeration module 12 are connected in sequence to form a channel for the expansion and liquefaction of the working fluid after energy release, cooling and liquefaction, forming a normal pressure or low pressure liquid working fluid entering the second liquid working fluid storage tank 13 for storage; the outlet of the second liquid working fluid storage tank 13, the inlet and outlet of the second liquid working fluid pump 14, the inlet and outlet of the fourth cold fluid channel of the second cold storage module 10, and the inlet of the main compressor 1 are connected in sequence to form a channel for pressurizing and rewarming the liquid working fluid obtained by energy release.

[0042] The closed compressed liquid working fluid energy storage method of the embodiment of the present invention is divided into two working modes, namely energy storage mode and energy release mode. The closed compressed liquid working fluid energy storage method adopts the above-mentioned closed compressed liquid working fluid energy storage system to operate:

[0043] 1) Energy storage mode

[0044] At this time, cold energy storage is completed in the first cold storage module 3 , and liquid working medium has been stored in the second liquid working medium storage tank 13 .

[0045] The liquid working medium stored in the second liquid working medium storage tank 13 is drawn out by the second liquid working medium pump 14 and then increased to a certain pressure, and enters the fourth cold fluid channel of the second cold storage module 10, and stores the cold energy in the second cold storage module 10; the working medium after releasing the cold energy is in a normal temperature gas phase state, and after merging with the working medium at the outlet of the booster compressor 6, enters the main compressor 1 for energy storage compression; the obtained high-pressure and high-temperature compressed working medium enters the first hot fluid channel of the heat storage module 2, and the released heat is stored in the heat storage module 2; the high-pressure and normal temperature working medium formed after releasing the heat enters the first cold storage module The second hot fluid channel of block 3 absorbs the cold energy stored in the first cold storage module 3, cools itself down and liquefies, and then enters the first liquid expander 4 for expansion and pressure reduction. At this time, it is in a normal pressure or low pressure pure liquid phase or a gas-liquid two-phase state, and then enters the first liquid working fluid storage tank 5, where the liquid phase part is stored in the tank, and the gas phase part flows back to the first cold storage module 3 through the steam outlet of the first liquid working fluid storage tank 5, and stores the cold energy in the first cold storage module 3 through the third cold fluid channel. After releasing the cold energy and heating up, it enters the booster compressor 6 to increase the pressure and then enters the main compressor 1 for further compression.

[0046] After the above process, the energy storage cycle is completed, and the flow paths of each medium are as follows: Figure 2 shown.

[0047] 2) Energy release mode

[0048] At this time, the thermal storage module 2 and the second cold storage module 10 have completed the storage of heat energy and cold energy respectively, and the first liquid working medium storage tank 5 has stored liquid working medium.

[0049] The liquid working medium stored in the first liquid working medium storage tank 5 is drawn out by the first liquid working medium pump 7 and pressurized to a high-pressure state; the high-pressure liquid working medium enters the second cold fluid channel of the first cold storage module 3, stores the cold energy in the first cold storage module 3, and reheats and expands to form a high-pressure room-temperature gas-phase working medium; after reheating, the working medium enters the heat storage module 2 to absorb the thermal energy stored therein, further heats up and expands to form a high-pressure and high-temperature gas-phase working medium; the high-pressure and high-temperature working medium enters the turbine 8 to expand and perform work, completing energy release. After energy release, the working medium may still be in a high-temperature state at a certain temperature, and is further cooled to room temperature by the cooler 9; the room-temperature and low-pressure working medium enters the third hot fluid channel of the second cold storage module 10 to absorb the cold energy stored therein, completing the cooling and liquefaction of the working medium; the cooled and liquefied working medium enters the second liquid expander 11 to further expand to a lower pressure, at which time it may be a gas-liquid two-phase state, and is fully cooled to a pure liquid phase by the refrigeration module 12 and then enters the second liquid working medium storage tank 13 for storage.

[0050] After the above process, the energy release cycle is completed, and the flow paths of each medium are as follows: Figure 3 shown.

[0051] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of patent protection, should still fall within the scope of this patent. Furthermore, the technical features of the present invention may be freely combined with one another, with other technical solutions, and with other technical solutions.

Claims

1. A closed compressed liquid working fluid energy storage system, characterized in that: include: A heat storage module (2) is provided with a first hot fluid channel and a first cold fluid channel; A first cold storage module (3) is provided with a second hot fluid channel, a second cold fluid channel and a third cold fluid channel, wherein the outlet of the first hot fluid channel is connected to the inlet of the second hot fluid channel, and the outlet of the second cold fluid channel is connected to the inlet of the first cold fluid channel; A second cold storage module (10) is provided with a third hot fluid channel and a fourth cold fluid channel, wherein the outlet of the first cold fluid channel is connected to the inlet of the third hot fluid channel, and the outlet of the fourth cold fluid channel and the outlet of the third cold fluid channel are both connected to the inlet of the first hot fluid channel; a first liquid working fluid storage tank (5), the first liquid working fluid storage tank (5) being provided with an inlet, a liquid outlet and a steam outlet, the outlet of the second hot fluid channel being communicated with the inlet of the first liquid working fluid storage tank (5), the liquid outlet of the first liquid working fluid storage tank (5) being communicated with the inlet of the second cold fluid channel, and the steam outlet of the first liquid working fluid storage tank (5) being connected with the inlet of the third cold fluid channel; a first liquid expander (4), wherein the outlet of the second hot fluid channel is connected to the inlet of the first liquid expander (4), and the outlet of the first liquid expander (4) is connected to the inlet of the first liquid working medium storage tank (5); a first liquid working medium pump (7), a liquid outlet of the first liquid working medium storage tank (5) connected to the inlet of the first liquid working medium pump (7), and an outlet of the first liquid expander (4) connected to the inlet of the second cold fluid channel; a second liquid expansion machine (11) and a refrigeration module (12), wherein the outlet of the third hot fluid channel is connected to the inlet of the second liquid expansion machine (11), and the outlet of the second liquid expansion machine (11) is connected to the inlet of the refrigeration module (12); A second liquid working fluid storage tank (13) and a second liquid working fluid pump (14) are provided with an inlet and an outlet, respectively. The outlet of the refrigeration module (12) is connected to the inlet of the second liquid working fluid storage tank (13), the outlet of the second liquid working fluid storage tank (13) is connected to the inlet of the second liquid working fluid pump (14), and the outlet of the second liquid working fluid pump (14) is connected to the inlet of the fourth cold fluid channel.

2. The closed compressed liquid working fluid energy storage system according to claim 1, characterized in that: include: a booster compressor (6), wherein the outlet of the third cold fluid channel is connected to the inlet of the booster compressor (6); The main compressor (1) has an outlet of the fourth cold fluid channel and an outlet of the third cold fluid channel both connected to the inlet of the main compressor (1), and the outlet of the main compressor (1) is connected to the inlet of the first hot fluid channel.

3. The closed compressed liquid working fluid energy storage system according to claim 1, characterized in that: include: A turbine (8) and a cooler (9), the outlet of the first cold fluid channel is connected to the inlet of the turbine (8), the outlet of the turbine (8) is connected to the inlet of the cooler (9), and the outlet of the cooler (9) is connected to the inlet of the third hot fluid channel.

4. A closed compressed liquid working medium energy storage method, characterized in that: The closed compressed liquid working fluid energy storage system according to any one of claims 1 to 3 is used for operation.

5. The closed-loop compressed liquid working medium energy storage method according to claim 4, characterized in that: The closed-loop compressed liquid working fluid energy storage method includes an energy storage mode, which includes the following steps: The liquid working medium stored in the second liquid working medium storage tank (13) is drawn out through the second liquid expander (11) and its pressure is increased, and then enters the fourth cold fluid channel of the second cold storage module (10), and cold energy is stored in the second cold storage module (10); The working fluid after releasing the cold energy is combined with the working fluid at the outlet of the booster compressor (6) and then enters the main compressor (1) for energy storage compression; The obtained compressed working fluid enters the first thermal fluid channel of the thermal storage module (2), and the released heat is stored in the thermal storage module (2); The working fluid formed after releasing heat enters the second hot fluid channel of the first cold storage module (3), absorbs the cold energy stored in the first cold storage module (3), then enters the first liquid expander (4) for expansion and pressure reduction, and then enters the first liquid working fluid storage tank (5), wherein the liquid phase is stored in the working fluid storage tank (5), and the gas phase flows back to the first cold storage module (3) through the steam outlet of the first liquid working fluid storage tank (5), and stores the cold energy in the first cold storage module (3) through the third cold fluid channel. The gas phase after releasing the cold energy and heating enters the booster compressor (6) to increase the pressure, and then enters the main compressor (1) for further compression.

6. The closed-loop compressed liquid working medium energy storage method according to claim 4, characterized in that: The closed-loop compressed liquid working fluid energy storage method includes an energy release mode, which includes the following steps: The liquid working medium stored in the first liquid working medium storage tank (5) is drawn out by the first liquid working medium pump (7) and then pressurized; The pressurized liquid working medium enters the second cold fluid channel of the first cold storage module (3), stores cold energy in the first cold storage module (3), and the pressurized liquid working medium reheats and expands to form reheated working medium; After the temperature is restored, the working fluid enters the heat storage module (2) to absorb the thermal energy stored therein, and further heats up and expands to form a gas phase working fluid; The gaseous working medium enters the turbine (8) to expand and perform work, completing energy release, and is further cooled by the cooler (9) to generate cooled working medium; The cooled working medium enters the third hot fluid channel of the second cold storage module (10) to absorb the cold energy stored therein, thereby completing the cooling and liquefaction of the working medium; The cooled and liquefied working medium enters the second liquid expander (11) for further expansion, is fully cooled to a pure liquid phase by the refrigeration module (12), and then enters the second liquid working medium storage tank (13) for storage.

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