Container type compressed inert gas energy storage system and operation method

Abstract

The invention discloses a container type compressed inert gas energy storage system and an operation method, and belongs to the field of energy storage, the container type compressed inert gas energy storage system comprises a pump turbine integrally driven by a motor generator, a plurality of normal-pressure water storage tanks connected with one end of the pump turbine and used for storing normal-pressure water, and a plurality of high-pressure energy storage tanks connected with the other end of the pump turbine; high-pressure gas and high-pressure water are stored in the high-pressure energy storage tank; the gas is water-insoluble inert gas, and the gas is filled at one time by considering the loss amount in the life cycle; a secondary energy storage medium is adopted, water is used as an indirect energy storage medium, and inert gas is used as a direct energy storage medium; a cooling water circulation loop is arranged between the motor generator and the normal-pressure water storage tank; during energy storage, the pump turbine compresses incoming water of the normal-pressure water storage tank to generate high-pressure water to compress gas in the high-pressure energy storage tank; during energy release, gas in the high-pressure energy storage tank pushes the pump turbine to generate electricity, and water is stored in the normal-pressure water storage tank after acting. The occupied area of the energy storage system can be greatly reduced, and the number of equipment is reduced.

Description

Technical Field

[0001] This invention relates to the field of gas energy storage technology, and in particular to a containerized compressed inert gas energy storage system and its operation method. Background Technology

[0002] Compressed gas energy storage, as a major component of new energy storage, is an effective means to improve the regulation capacity of power systems and is currently in the process of commercial promotion and application. With the development of technology, compressed gas energy storage power plants have placed higher demands on efficiency, cost, and land area. Heat utilization rate, plant power consumption rate, and land area are key factors restricting the efficiency of compressed carbon dioxide energy storage. Increasing the heat storage temperature, reducing the plant power consumption rate, and reducing the land area are conducive to improving the overall efficiency of the power plant, thereby improving the economic efficiency of power plant operation.

[0003] Existing compressed gas energy storage systems include thermal storage systems, gas storage systems, compressors, expanders, auxiliary equipment, and heat exchangers. These systems have many components, occupy a large area, and are costly, making it difficult to achieve device integration and miniaturization. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a containerized compressed inert gas energy storage system and its operation method. The system uses inert gas as an indirect energy storage medium and water as a direct energy storage medium. It uses water pumps and turbines for energy storage and release. The indirect and direct energy storage media are integrated and placed in a single unit, which simplifies the energy storage system, can significantly reduce the footprint of the energy storage system, reduce the number of devices, promote the modularization and miniaturization of energy storage devices, and further promote the application of energy storage devices in urban areas.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A containerized compressed inert gas energy storage system includes a water pump turbine driven by an integrated electric generator, several atmospheric pressure water tanks connected to one end of the water pump turbine for storing atmospheric pressure water, and several high-pressure energy storage tanks connected to the other end of the water pump turbine. The high-pressure energy storage tanks store high-pressure gas and high-pressure water. The gas used is an inert gas that is insoluble in water, and the gas is filled once to account for losses over its life cycle. A two-stage energy storage medium is used, with water as the indirect energy storage medium and the inert gas as the direct energy storage medium. A cooling water circulation loop is provided between the electric generator and the atmospheric pressure water tanks. The electric generator is an integrated machine that combines a motor and a generator.

[0007] A further improvement of the technical solution of the present invention is that: the system is further provided with a water supply tank connected to the electric generator, and a cooling water circulation pump is provided between the water supply tank and the electric generator; the cooling water circulation loop includes a cooling water inlet pipe and a cooling water return pipe, the cooling water circulation pump cools the generator and frequency converter in the electric generator, the cooling water from the atmospheric pressure water tank is sent to the electric generator after being pressurized by the cooling water circulation pump through the cooling water inlet pipe, and after being heated, it is sent to the atmospheric pressure water tank through the cooling water return pipe, and the heated cooling water is cooled by the water after the water pump turbine has done its work; a water supply pipe is provided between the water supply tank and the atmospheric pressure water tank.

[0008] A further improvement of the technical solution of the present invention is that: both the atmospheric pressure water storage tank and the high pressure energy storage tank are set as vertical storage tanks; the water replenishment tank, cooling water circulation pump, water pump turbine and electric generator are integrated and set up, and the atmospheric pressure water storage tank and the high pressure energy storage tank are distributed on both sides.

[0009] A further improvement of the technical solution of the present invention is as follows: a water pump turbine inlet valve is provided between the water pump turbine and the atmospheric pressure water storage tank; a first shut-off valve is provided on the cooling water inlet pipeline; a fourth shut-off valve and a second shut-off valve are sequentially provided on the cooling water return pipeline; a second water supply valve is provided on the water supply pipeline; a third shut-off valve is provided between the electric generator and the cooling water circulation pump; and a first water supply valve is provided between the cooling water circulation pump and the water supply tank.

[0010] A further improvement to the technical solution of the present invention is that the formula for calculating the diameter of the high-pressure energy storage tank is as follows:

[0011]

[0012] Where d1 is the diameter of the high-pressure energy storage tank, in meters; d 10 n is the reference diameter of the high-pressure energy storage tank, taken as 1m; n1 is the number of high-pressure energy storage tanks; n 10 P1 represents the standard number of high-pressure energy storage tanks, taken as 6; P1 represents the design pressure of the high-pressure energy storage tank, in MPa; P 10 The design reference pressure for the high-pressure energy storage tank is 10 MPa; h1 is the height of the high-pressure energy storage tank in meters; h 10 The reference height for the high-pressure energy storage tank is taken as 14m.

[0013] The formula for calculating the diameter of the atmospheric pressure water storage tank is as follows:

[0014]

[0015] Where d2 is the diameter of the atmospheric pressure water storage tank, in meters; d 20n1 represents the reference diameter of the atmospheric pressure water storage tank, taken as 4m; n2 represents the number of atmospheric pressure water storage tanks; n 20 h1 represents the standard number of atmospheric pressure water storage tanks, taken as 4; h2 represents the height of the atmospheric pressure water storage tank, in meters; h 20 The reference height for the atmospheric pressure water storage tank is 5m.

[0016] A further improvement of the technical solution of the present invention is that: the water pump of the water pump turbine operates with a constant flow rate and variable head, and the electric motor in the electric generator operates with frequency conversion within the sliding pressure range of the high-pressure energy storage tank;

[0017] The formula for calculating the total volume V1 required for an atmospheric pressure water storage tank is as follows:

[0018] V1=(P2-P3)V0PN

[0019] In the formula, P2 is the upper limit of the working pressure of the high-pressure energy storage tank, in MPa; P3 is the lower limit of the working pressure of the high-pressure energy storage tank, in MPa; V0 is the water volume required per unit of power generation, in m³. 3 / kW·h; P is the generator power, with values ​​of 80, 90, 100, 112, 132, 160, 180, 200, 225, 250, 280, 315, 355kW; N is the generator operating hours, in hours.

[0020] The formula for calculating the total required volume V2 of the high-pressure energy storage tank is as follows:

[0021]

[0022] In the formula, V1 is the total volume required for the atmospheric pressure water storage tank, in m³. 3 V2 represents the total required volume of the high-pressure energy storage tank, in cubic meters (m³). 3 V0 represents the volume of water required per unit of electricity generated, in cubic meters (m³). 3 / kW·h; β1 is the water-to-gas ratio coefficient; β2 is the gas-side redundancy coefficient of the high-pressure energy storage tank, with a value of 1.05-1.1; ρ1 is the density of the high-pressure energy storage tank at its working pressure.

[0023] An operating method for a containerized compressed inert gas energy storage system includes:

[0024] When the energy storage system stores energy, the water pump and turbine compress the water from the atmospheric pressure storage tank to generate high-pressure water, which in turn compresses the gas in the high-pressure energy storage tank.

[0025] When the energy storage system releases energy, the gas in the high-pressure energy storage tank drives the water pump turbine to generate electricity, and after the work is done, the water is stored in the atmospheric pressure water storage tank.

[0026] When the cooling water circulation system is running normally, the first water supply valve is closed, the second water supply valve is closed, and the first shut-off valve, the second shut-off valve, the third shut-off valve and the fourth shut-off valve are open. The water in the atmospheric pressure storage tank is pressurized by the cooling water circulation pump and sent to the electric generator for cooling before returning to the atmospheric pressure storage tank.

[0027] When the energy storage system is replenished with water, the water pump turbine inlet valve is closed, the first shut-off valve, the second shut-off valve, the third shut-off valve and the fourth shut-off valve are closed, the first water replenishment valve is opened and the second water replenishment valve is opened. The replenished water is sent to the atmospheric pressure water storage tank after being pressurized by the cooling water circulation pump through the water replenishment tank. The cooling water circulation pump also serves as the water replenishment pump.

[0028] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0029] 1. This invention uses two energy storage media: high-pressure gas and high-pressure water, and the system does not require a heat storage medium.

[0030] 2. This invention utilizes the temperature drop after high-pressure water generates electricity as the system's cold source, eliminating the need for a cooling tower.

[0031] 3. In this invention, the system water supply and cooling water share a single pump set. The system cooling and water supply are achieved by switching valve sets, which can reduce the number of pump sets.

[0032] 4. The present invention uses a water pump turbine that integrates electric motor and generator as an energy storage and energy release device, so that the same set of equipment is used for power consumption and power generation, and the main equipment can be reduced by half.

[0033] 5. In this invention, the entire system is in a closed loop. Except for water replenishment required for system leakage, water and gas are filled once without additional replenishment, making operation and maintenance simple.

[0034] 6. The integrated layout of all system equipment in this invention can reduce the footprint of the device by 50%, making it suitable for widespread use in cities.

[0035] 7. The system in this invention adopts a closed demineralized water system and the whole system is made of carbon steel, which can reduce the cost by 30%.

[0036] 8. The system in this invention is modularly arranged, and the water storage tank and energy storage tank can be flexibly combined according to the usage requirements. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a containerized compressed inert gas energy storage system provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the layout of a containerized compressed inert gas energy storage system provided in an embodiment of the present invention;

[0040] The components include: 1. Electric generator; 2. Water pump and turbine; 3. Cooling water circulation pump; 4. Makeup water tank; 5. Atmospheric pressure water storage tank; 6. High pressure energy storage tank; 7. First makeup water valve; 8. First shut-off valve; 9. Second shut-off valve; 10. Second makeup water valve; 11. Third shut-off valve; 12. Fourth shut-off valve; 13. Water pump and turbine inlet valve; 14. Cooling water inlet pipeline; 15. Cooling water return pipeline; 16. Makeup water pipeline. Detailed Implementation

[0041] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0045] like Figure 1As shown, a containerized compressed inert gas energy storage system includes a water pump turbine 2 driven by an electric generator 1, several atmospheric pressure water storage tanks 5 connected to one end of the water pump turbine 2 for storing atmospheric pressure water, and several high pressure energy storage tanks 6 connected to the other end of the water pump turbine 2. The high pressure energy storage tanks 6 store high pressure gas and high pressure water. The gas used is an inert gas insoluble in water, and the gas is filled once considering its lifespan loss. A two-stage energy storage medium is used, with water as the indirect energy storage medium and the inert gas as the direct energy storage medium. A cooling water circulation loop is provided between the electric generator 1 and the atmospheric pressure water storage tanks 5. The electric generator 1 is an integrated machine combining a motor and a generator. The number of atmospheric pressure water storage tanks 5 and high pressure energy storage tanks 6 can be set according to actual conditions.

[0046] Furthermore, the system is also equipped with a water supply tank 4 connected to the electric generator 1, and a cooling water circulation pump 3 is installed between the water supply tank 4 and the electric generator 1; the cooling water circulation loop includes a cooling water inlet pipe 14 and a cooling water return pipe 15. The cooling water circulation pump 3 cools the generator and frequency converter in the electric generator 1. The cooling water from the atmospheric pressure water storage tank 5 is sent to the electric generator 1 after being pressurized by the cooling water circulation pump 3 through the cooling water inlet pipe 14 and heated. After being heated, it is sent to the atmospheric pressure water storage tank 5 through the cooling water return pipe 15. The heated cooling water is cooled by the water after the water pump turbine 2 has done its work; a water supply pipe 16 is installed between the water supply tank 4 and the atmospheric pressure water storage tank 5.

[0047] Furthermore, such as Figure 2 As shown, both the atmospheric pressure water storage tank 5 and the high pressure energy storage tank 6 are vertical tanks; the water supply tank 4, the cooling water circulation pump 3, the water pump turbine 2 and the electric generator 1 are integrated and set up, while the atmospheric pressure water storage tank 5 and the high pressure energy storage tank 6 are distributed on both sides.

[0048] Furthermore, a water pump turbine inlet valve 13 is installed between the water pump turbine 2 and the atmospheric pressure water storage tank 5; a first shut-off valve 8 is installed on the cooling water inlet pipeline 14; a fourth shut-off valve 12 and a second shut-off valve 9 are sequentially installed on the cooling water return pipeline 15; a second water supply valve 10 is installed on the water supply pipeline 16; a third shut-off valve 11 is installed between the electric generator 1 and the cooling water circulation pump 3; and a first water supply valve 7 is installed between the cooling water circulation pump 3 and the water supply tank 4.

[0049] Furthermore, the formula for calculating the diameter of the high-pressure energy storage tank 6 is as follows:

[0050]

[0051] In the formula, d1 is the diameter of the high-pressure energy storage tank, in meters; d 10 n is the reference diameter of the high-pressure energy storage tank, taken as 1m; n1 is the number of high-pressure energy storage tanks; n 10P1 represents the standard number of high-pressure energy storage tanks, taken as 6; P1 represents the design pressure of the high-pressure energy storage tank, in MPa; P 10 The design reference pressure for the high-pressure energy storage tank is 10 MPa; h1 is the height of the high-pressure energy storage tank in meters; h 10 The reference height for the high-pressure energy storage tank is taken as 14m.

[0052] The formula for calculating the diameter of atmospheric pressure water storage tank 5 is as follows:

[0053]

[0054] In the formula, d2 is the diameter of the atmospheric pressure water storage tank, in meters; d 20 n1 represents the reference diameter of the atmospheric pressure water storage tank, taken as 4m; n2 represents the number of atmospheric pressure water storage tanks; n 20 h1 represents the standard number of atmospheric pressure water storage tanks, taken as 4; h2 represents the height of the atmospheric pressure water storage tank, in meters; h 20 The reference height for the atmospheric pressure water storage tank is 5m.

[0055] Furthermore, the water pump of the water pump turbine 2 operates with a constant flow rate and variable head, and the electric motor in the electric generator 1 operates with a variable frequency within the sliding pressure range of the high-pressure energy storage tank 6;

[0056] The formula for calculating the total volume V1 required for an atmospheric pressure water storage tank is as follows:

[0057] V1=(P2-P3)V0PN

[0058] In the formula, P2 is the upper limit of the working pressure of the high-pressure energy storage tank, in MPa; P3 is the lower limit of the working pressure of the high-pressure energy storage tank, in MPa; V0 is the water volume required per unit of power generation, in m³. 3 / kW·h; P is the generator power, with values ​​of 80, 90, 100, 112, 132, 160, 180, 200, 225, 250, 280, 315, 355kW; N is the generator operating hours, in hours.

[0059] The formula for calculating the total required volume V2 of the high-pressure energy storage tank is as follows:

[0060]

[0061] In the formula, V1 is the total volume required for the atmospheric pressure water storage tank, in m³. 3 V2 represents the total required volume of the high-pressure energy storage tank, in cubic meters (m³). 3 V0 represents the volume of water required per unit of electricity generated, in cubic meters (m³). 3 / kW·h; β1 is the water-to-gas ratio coefficient; β2 is the gas-side redundancy coefficient of the high-pressure energy storage tank, with a value of 1.05-1.1; ρ1 is the density of the high-pressure energy storage tank at its working pressure.

[0062] Furthermore, the system employs a closed-loop demineralized water system, and the entire system is constructed of carbon steel.

[0063] An operating method for a containerized compressed inert gas energy storage system includes:

[0064] When the energy storage system stores energy, the water pump turbine 2 compresses the water from the atmospheric pressure water storage tank 5 to generate high-pressure water, which in turn compresses the gas in the high-pressure energy storage tank 6.

[0065] When the energy storage system releases energy, the gas in the high-pressure energy storage tank 6 drives the water pump turbine 2 to generate electricity. After the work is completed, the water is stored in the atmospheric pressure water storage tank 5.

[0066] When the cooling water circulation system is running normally, the first water supply valve 7 is closed, the second water supply valve 10 is closed, and the first shut-off valve 8, the second shut-off valve 9, the third shut-off valve 11 and the fourth shut-off valve 12 are open. The water in the atmospheric pressure storage tank 5 is pressurized by the cooling water circulation pump 3 and sent to the electric generator 1 for cooling before returning to the atmospheric pressure storage tank.

[0067] When the energy storage system is replenished with water, the water pump turbine inlet valve 13 is closed, the first shut-off valve 8, the second shut-off valve 9, the third shut-off valve 11 and the fourth shut-off valve 12 are closed, the first water replenishment valve 7 is opened, the second water replenishment valve 10 is opened, and the replenished water is sent to the atmospheric pressure water storage tank 5 after being pressurized by the cooling water circulation pump 3 through the water replenishment tank 4. The cooling water circulation pump 3 also serves as the water replenishment pump.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A containerized compressed inert gas energy storage system, characterized in that: It includes a water pump turbine (2) driven by an electric generator (1), several atmospheric pressure water storage tanks (5) connected to one end of the water pump turbine (2) for storing atmospheric pressure water, and several high pressure energy storage tanks (6) connected to the other end of the water pump turbine (2); the high pressure energy storage tanks (6) store high pressure gas and high pressure water; the gas is an inert gas that is insoluble in water, and the gas is filled once considering the loss during its life cycle; a two-stage energy storage medium is used, with water as the indirect energy storage medium and inert gas as the direct energy storage medium; a cooling water circulation loop is set between the electric generator (1) and the atmospheric pressure water storage tanks (5); the electric generator (1) is an integrated machine that combines an electric motor and a generator.

2. The containerized compressed inert gas energy storage system according to claim 1, characterized in that: The system is also equipped with a water supply tank (4) connected to the electric generator (1), and a cooling water circulation pump (3) is provided between the water supply tank (4) and the electric generator (1); the cooling water circulation loop includes a cooling water inlet pipe (14) and a cooling water return pipe (15). The cooling water circulation pump (3) cools the generator and frequency converter in the electric generator (1). The cooling water from the atmospheric pressure water storage tank (5) is sent to the electric generator (1) after being pressurized by the cooling water circulation pump (3) through the cooling water inlet pipe (14) and heated. After being heated, it is sent to the atmospheric pressure water storage tank (5) through the cooling water return pipe (15). The heated cooling water is cooled by the water after the water pump turbine (2) has finished its work. A water supply pipe (16) is provided between the water supply tank (4) and the atmospheric pressure water storage tank (5).

3. The containerized compressed inert gas energy storage system according to claim 2, characterized in that: The atmospheric pressure water storage tank (5) and the high pressure energy storage tank (6) are both set as vertical storage tanks; the water replenishment tank (4), cooling water circulation pump (3), water pump turbine (2) and electric generator (1) are integrated and set up, and the atmospheric pressure water storage tank (5) and the high pressure energy storage tank (6) are distributed on both sides.

4. A containerized compressed inert gas energy storage system according to claim 2, characterized in that: A water pump turbine inlet valve (13) is provided between the water pump turbine (2) and the atmospheric pressure water storage tank (5); a first shut-off valve (8) is provided on the cooling water inlet pipeline (14); a fourth shut-off valve (12) and a second shut-off valve (9) are provided in sequence on the cooling water return pipeline (15); a second water supply valve (10) is provided on the water supply pipeline (16); a third shut-off valve (11) is provided between the electric generator (1) and the cooling water circulation pump (3); and a first water supply valve (7) is provided between the cooling water circulation pump (3) and the water supply tank (4).

5. A containerized compressed inert gas energy storage system according to claim 1, characterized in that: The formula for calculating the diameter of the high-pressure energy storage tank (6) is as follows: Where d1 is the diameter of the high-pressure energy storage tank, in meters; d 10 n is the reference diameter of the high-pressure energy storage tank, taken as 1m; n1 is the number of high-pressure energy storage tanks; n 10 P1 represents the standard number of high-pressure energy storage tanks, taken as 6; P1 represents the design pressure of the high-pressure energy storage tank, in MPa; P 10 The design reference pressure for the high-pressure energy storage tank is 10 MPa; h1 is the height of the high-pressure energy storage tank in meters; h 10 The reference height for the high-pressure energy storage tank is taken as 14m. The formula for calculating the diameter of the atmospheric pressure water storage tank (5) is as follows: Where d2 is the diameter of the atmospheric pressure water storage tank, in meters; d 20 n1 represents the reference diameter of the atmospheric pressure water storage tank, taken as 4m; n2 represents the number of atmospheric pressure water storage tanks; n 20 h1 represents the standard number of atmospheric pressure water storage tanks, taken as 4; h2 represents the height of the atmospheric pressure water storage tank, in meters; h 20 The reference height for the atmospheric pressure water storage tank is 5m.

6. A containerized compressed inert gas energy storage system according to claim 1, characterized in that: The water pump of the water pump turbine (2) operates with constant flow and variable head, and the motor in the electric generator (1) operates with variable frequency within the sliding pressure range of the high pressure storage tank (6). The formula for calculating the total volume V1 required for an atmospheric pressure water storage tank is as follows: V1=(P2-P3)V0PN In the formula, P2 is the upper limit of the working pressure of the high-pressure energy storage tank, in MPa; P3 is the lower limit of the working pressure of the high-pressure energy storage tank, in MPa; V0 is the water volume required per unit of power generation, in m³. 3 / kW·h; P is the generator power, with values ​​of 80, 90, 100, 112, 132, 160, 180, 200, 225, 250, 280, 315, 355kW; N is the generator operating hours, in hours. The formula for calculating the total required volume V2 of the high-pressure energy storage tank is as follows: In the formula, V1 is the total volume required for the atmospheric pressure water storage tank, in m³. 3 V2 represents the total required volume of the high-pressure energy storage tank, in cubic meters (m³). 3 V0 represents the volume of water required per unit of electricity generated, in cubic meters (m³). 3 / kW·h; β1 is the water-to-gas ratio coefficient; β2 is the gas-side redundancy coefficient of the high-pressure energy storage tank, with a value of 1.05-1.1; ρ1 is the density of the high-pressure energy storage tank at its working pressure.

7. The operating method of a containerized compressed inert gas energy storage system as described in any one of claims 1-6, characterized in that: include: When the energy storage system stores energy, the water pump turbine (2) compresses the water in the atmospheric pressure water tank (5) to generate high pressure water, which in turn compresses the gas in the high pressure energy storage tank (6); When the energy storage system releases energy, the gas in the high-pressure energy storage tank (6) drives the water pump turbine (2) to generate electricity. After the work is done, the water is stored in the atmospheric pressure water storage tank (5). When the cooling water circulation system is running normally, the first water supply valve (7) is closed, the second water supply valve (10) is closed, and the first shut-off valve (8), the second shut-off valve (9), the third shut-off valve (11) and the fourth shut-off valve (12) are opened. The water in the atmospheric pressure storage tank (5) is pressurized by the cooling water circulation pump (3) and sent to the electric generator (1) for cooling before returning to the atmospheric pressure storage tank. When the energy storage system is replenished with water, the water pump turbine inlet valve (13) is closed, the first shut-off valve (8), the second shut-off valve (9), the third shut-off valve (11) and the fourth shut-off valve (12) are closed, the first water replenishment valve (7) is opened and the second water replenishment valve (10) is opened. The replenished water is sent to the atmospheric pressure water storage tank (5) after being pressurized by the cooling water circulation pump (3) through the water replenishment tank (4). The cooling water circulation pump (3) also serves as the water replenishment pump.

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