Mine compressed air energy storage system with constant pressure of gas film

Abstract

This invention discloses a mine compressed air energy storage system with constant pressure gas film storage. The system includes: a gas filling and discharging system; a mine water tank containing pressurized water; a gas film disposed within the pressurized water body, connected to the inner wall of the mine water tank and forming a gas storage space with it; the gas film being adapted to deform with the gas filling and discharging of the storage space to change its storage volume; and a gas guide pipe, one end of which is connected to the gas filling and discharging system and the other end of which communicates with the storage space. The mine compressed air energy storage system with constant pressure gas film storage according to this invention has advantages such as stable gas pressure and high reliability.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, and more specifically, to a mine compressed air energy storage system with constant pressure gas film storage. Background Technology

[0002] Compressed air energy storage systems utilize surplus electrical energy to drive compressors to compress and store air during periods of low electricity demand and peak power generation. During peak electricity demand, the stored compressed air is released to drive turbine generators to generate electricity.

[0003] The pressure stability of the gas storage space directly affects the energy storage and release process.

[0004] Compressed air energy storage systems utilizing underground spaces such as mine tunnels can provide ample storage space for compressed air.

[0005] In related technologies, the compressed air energy storage system in mines directly stores gas under pressure in a hard chamber. The gas storage space has a fixed volume, and the gas pressure fluctuates with the amount of gas as the filling and releasing processes proceed, affecting the energy storage and release processes. Moreover, directly storing gas under pressure in a chamber places high demands on the sealing of the surrounding rock and the pressure lining. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a mine compressed air energy storage system with constant pressure gas film storage, which has the advantages of stable gas pressure and high reliability.

[0007] To achieve the above objectives, an embodiment of the present invention provides a mine compressed air energy storage system with constant pressure gas storage using a gas film. The mine compressed air energy storage system with constant pressure gas storage includes: a gas filling and discharging system; a mine water tank containing pressurized water; a gas film disposed within the pressurized water body, the gas film being connected to the inner wall of the mine water tank and forming a gas storage space with the inner wall of the mine water tank, the gas film being adapted to deform with the gas filling and discharging of the gas storage space to change the gas storage volume of the gas storage space; and a gas guide pipe, one end of which is connected to the gas filling and discharging system and the other end of which is connected to the gas storage space.

[0008] The compressed air energy storage system for mines with constant pressure gas film storage according to embodiments of the present invention has advantages such as stable gas pressure and high reliability.

[0009] In addition, the mine compressed air energy storage system with gas film constant pressure gas storage according to the above embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, the air film is connected to the bottom wall of the mine water pool.

[0010] According to one embodiment of the present invention, the inner wall of the mine water pool is provided with a gas storage groove, and the gas film seals the gas storage groove.

[0011] According to one embodiment of the present invention, the air film is provided with an air port, and the lower end of the air guide tube is connected to the air port.

[0012] According to one embodiment of the present invention, the gas storage space is located below the liquid level of the pressurized water body.

[0013] According to one embodiment of the present invention, the portion of the gas guide pipe within the mine water tank extends vertically.

[0014] According to one embodiment of the present invention, the gas filling and releasing system is located above the mine water pool.

[0015] According to one embodiment of the present invention, the inflation / deflation system includes: an inflation branch, the outlet of which is connected to the gas guide pipe; a deflation branch, the inlet of which is connected to the gas guide pipe; a compressor, the outlet of which is connected to the inlet of the inflation branch; a motor, which is drivenly connected to the compressor; a turbine, the inlet of which is connected to the outlet of the deflation branch; and a generator, which is drivenly connected to the turbine.

[0016] According to one embodiment of the present invention, the charging and degassing system further includes: a charging heat exchanger having a charging air channel and a charging medium channel, the charging air channel being connected to the charging branch; a degassing heat exchanger having a degassing air channel and a degassing medium channel, the degassing air channel being connected to the degassing branch; a cryogenic storage tank adapted to store a cryogenic heat exchange medium, the outlet of the cryogenic storage tank being connected to the inlet of the charging medium channel, and the inlet of the cryogenic storage tank being connected to the outlet of the degassing medium channel; and a high-temperature storage tank adapted to store a high-temperature heat exchange medium, the inlet of the high-temperature storage tank being connected to the outlet of the charging medium channel, and the outlet of the high-temperature storage tank being connected to the inlet of the degassing medium channel.

[0017] According to one embodiment of the present invention, the inflation / deflation system further includes: an inflation valve connected to the inflation branch; and a deflation valve connected to the deflation branch.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a mine compressed air energy storage system with constant pressure gas film storage according to an embodiment of the present invention.

[0020] Figure reference numerals: Mine compressed air energy storage system with constant pressure gas film storage: 1. Inflation branch 101, Exhaust branch 102, Compressor 103, Motor 104, Turbine 105, Generator 106, Inflation heat exchanger 107, Exhaust heat exchanger 108, Low temperature storage tank 109, High temperature storage tank 110, Inflation valve 111, Exhaust valve 112, Mine water pool 20, Pressurized water body 21, Gas film 30, Gas storage space 31, Gas port 32, Gas guide pipe 40. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] 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," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The following description, with reference to the accompanying drawings, describes a mine compressed air energy storage system 1 with constant pressure gas film storage according to an embodiment of the present invention.

[0025] like Figure 1 As shown, the mine compressed air energy storage system 1 with constant pressure gas storage according to an embodiment of the present invention includes a gas filling and discharging system, a mine water tank 20, a gas film 30, and a gas guide pipe 40.

[0026] The mine water tank 20 stores pressurized water 21. An air film 30 is disposed within the pressurized water 21, connected to the inner wall of the mine water tank 20 and forming an air storage space 31. The air film 30 is adapted to deform with the inflation and deflation of the air storage space 31 to change its air storage volume. One end of the air guide pipe 40 is connected to the inflation and deflation system, and the other end is connected to the air storage space 31.

[0027] Specifically, during the gas-filling energy storage process, compressed air from the gas filling and releasing system enters the gas storage space 31 through the air guide pipe 40, causing the gas film 30 to deform and increasing the volume of the gas storage space 31 by overcoming the pressure of the pressurized water body 21. During the gas-releasing energy release process, under the pressure of the pressurized water body 21 in the mine water pool 20, the gas film 30 deforms, reducing the volume of the gas storage space 31, and allowing the gas in the gas storage space 31 to be discharged to the gas filling and releasing system through the air guide pipe 40.

[0028] Because the gas film 30 is adapted to deform during inflation and deflation to change the gas storage volume of the gas storage space 31, pressure is applied from the pressurizing water body 21 to the surface of the gas film 30 away from the gas storage space 31, thereby providing pressure for the gas in the gas storage space 31. During the inflation and deflation process, since the gas film 30 is connected to the inner wall of the mine water tank 20, the depth of the gas storage space 31 in the pressurizing water body 21 does not change, ensuring that the gas in the gas storage space 31 always maintains the same pressure.

[0029] The gas pressure within the gas storage space 31 can be adjusted by changing the depth of the gas storage space 31 from the water surface of the pressurizing water body 21. For example, if the gas storage space 31 is located at the bottom of the mine water tank 20, the gas pressure within the gas storage space 31 can be adjusted by changing the water level of the pressurizing water body 21 in the mine water tank 20. After adjusting to the required pressure, the water level is kept constant during the filling and discharging process to maintain a constant gas pressure.

[0030] According to an embodiment of the present invention, a mine compressed air energy storage system 1 with constant pressure gas storage using a gas film is provided. The gas film 30 is disposed within the pressurized water body 21. The gas film 30 is connected to the inner wall of the mine water tank 20 and forms a gas storage space 31 with the inner wall of the mine water tank 20. The gas film 30 is adapted to deform with the inflation and deflation of the gas storage space 31 to change the gas storage volume of the gas storage space 31. Compared with the method of using a fixed volume gas storage space in related technologies, the surface of the gas film 30 away from the gas storage space 31 can bear the pressure of the pressurized water body 21 to apply pressure to the gas in the gas storage space 31. At the same time, since the gas film 30 is connected to the inner wall of the mine water tank 20, the depth of the gas storage space 31 in the pressurized water body 21 will not change, so that the gas pressure in the gas storage space 31 can be kept constant, avoiding the influence of gas pressure changes on the energy storage and release process.

[0031] In addition, by setting up an air membrane 30 and an air storage space 31 for air storage, compared with the method of directly utilizing the mine space for air storage in related technologies, the mine water pool 20 only needs to be waterproofed in the part storing the pressurized water body 21 and airtightened in the air storage space 31, without the need for overall airtightness treatment. This can reduce the sealing requirements for the surrounding rock and lining of the mine and improve the reliability of air storage.

[0032] Therefore, the mine compressed air energy storage system 1 with constant pressure gas storage according to the embodiment of the present invention has the advantages of stable gas pressure and high reliability.

[0033] The following description, with reference to the accompanying drawings, describes a mine compressed air energy storage system 1 with constant pressure gas film storage according to a specific embodiment of the present invention.

[0034] In some specific embodiments of the present invention, such as Figure 1 As shown, the mine compressed air energy storage system 1 with constant pressure gas storage according to an embodiment of the present invention includes a gas filling and discharging system, a mine water tank 20, a gas film 30, and a gas guide pipe 40.

[0035] Specifically, such as Figure 1 As shown, the air film 30 is connected to the bottom wall of the mine water tank 20. This facilitates providing sufficient water pressure to the air storage space 31.

[0036] More specifically, such as Figure 1 As shown, the inner wall of the mine water tank 20 is provided with a gas storage groove, and the gas film 30 covers the gas storage groove. This facilitates the formation of the gas storage space 31.

[0037] Optionally, such as Figure 1 As shown, the air film 30 is provided with an air inlet 32, and the lower end of the air guide tube 40 is connected to the air inlet 32. This facilitates the connection between the air guide tube 40 and the air storage space 31.

[0038] Furthermore, such as Figure 1As shown, the gas storage space 31 is located below the liquid surface of the pressurized water body 21. This facilitates the pressurized water body 21 to provide pressure to the gas in the gas storage space 31, thus maintaining a constant gas pressure within the gas storage space 31.

[0039] Advantageously, such as Figure 1 As shown, the portion of the gas guide pipe 40 within the mine water tank 20 extends vertically. This facilitates the connection of the gas guide pipe 40 to the gas storage space 31 and the gas filling and discharging system, respectively.

[0040] More advantageously, such as Figure 1 As shown, the gas filling and venting system is located above the mine water tank 20. This facilitates the setup, maintenance, and operation of the gas filling and venting system.

[0041] Figure 1 A mine compressed air energy storage system 1 with gas film constant pressure gas storage according to some examples of the present invention is shown. For example... Figure 1 As shown, the inflation / deflation system includes an inflation branch 101, a deflation branch 102, a compressor 103, a motor 104, a turbine 105, and a generator 106. The outlet of the inflation branch 101 is connected to the air guide pipe 40. The inlet of the deflation branch 102 is connected to the air guide pipe 40. The outlet of the compressor 103 is connected to the inlet of the inflation branch 101. The motor 104 is driven by the compressor 103. The inlet of the turbine 105 is connected to the outlet of the deflation branch 102. The generator 106 is driven by the turbine 105. Specifically, during periods of low electricity consumption and peak power generation, surplus electrical energy is used to power the motor 104. The motor 104 drives the compressor 103 to compress air, which is then injected into the air storage space 31 through the inflation branch 101 and the air guide pipe 40. During peak electricity demand, the gas in the gas storage space 31 is discharged to the turbine 105 through the gas pipe 40 and the gas release branch 102, driving the turbine 105 and the generator 106 to generate electricity. This facilitates energy storage and release through the gas charging and discharging process.

[0042] Specifically, such as Figure 1As shown, the charging and venting system further includes a charging heat exchanger 107, a venting heat exchanger 108, a cryogenic storage tank 109, and a high-temperature storage tank 110. The charging heat exchanger 107 has a charging air flow channel and a charging medium flow channel, the charging air flow channel being connected to the charging branch 101. The venting heat exchanger 108 has a venting air flow channel and a venting medium flow channel, the venting air flow channel being connected to the venting branch 102. The cryogenic storage tank 109 is suitable for storing a cryogenic heat exchange medium; the outlet of the cryogenic storage tank 109 is connected to the inlet of the charging medium flow channel, and the inlet of the cryogenic storage tank 109 is connected to the outlet of the venting medium flow channel. The high-temperature storage tank 110 is suitable for storing a high-temperature heat exchange medium; the inlet of the high-temperature storage tank 110 is connected to the outlet of the charging medium flow channel, and the outlet of the high-temperature storage tank 110 is connected to the inlet of the venting medium flow channel. Specifically, during the inflation process, the air is compressed by the compressor 103 and heated. As it passes through the inflation heat exchanger 107, it exchanges heat with the low-temperature heat exchange medium flowing into the low-temperature storage tank 109. The cooled air then flows through the air guide pipe 40 into the storage space 31, and the heated heat exchange medium flows into the high-temperature storage tank 110 for storage. During the deflation process, the gas in the storage space 31 is discharged through the air guide pipe 40 to the deflation branch 102. As it passes through the deflation heat exchanger 108, it exchanges heat with the high-temperature heat exchange medium flowing into the high-temperature storage tank 110. The heated air then enters the turbine 105, driving the generator 106 to generate electricity. The cooled heat exchange medium flows into the low-temperature storage tank 109 for storage. This allows for the recovery and storage of the heat of compression of compressed air, which is then used to heat the compressed air before it enters the turbine 105, thereby increasing the temperature of the gas entering the turbine 105, improving the operating efficiency of the turbine 105, and ensuring that the turbine 105 operates at a suitable gas temperature. Furthermore, it eliminates the need for combustion heating equipment, reducing equipment and operating costs.

[0043] More specifically, such as Figure 1 As shown, the inflation / deflation system also includes an inflation valve 111 and a deflation valve 112. The inflation valve 111 is connected to the inflation branch 101. The deflation valve 112 is connected to the deflation branch 102. This allows the inflation valve 111 and deflation valve 112 to switch the connection between the air guide tube 40 and the inflation branch 101 and deflation branch 102, facilitating switching between inflation and deflation in the inflation / deflation system.

[0044] Other components and operations of the mine compressed air energy storage system 1 with gas film constant pressure gas storage according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A mine compressed air energy storage system with constant pressure gas film storage, characterized in that, include: Inflation / deflation system; A mine water pool, wherein the mine water pool stores pressurized water; An air film is disposed in the pressurized water body. The air film is connected to the inner wall of the mine water tank and forms an air storage space with the inner wall of the mine water tank. The air film is adapted to deform with the inflation and deflation of the air storage space to change the air storage volume of the air storage space. A gas guide pipe, one end of which is connected to the gas filling and discharging system and the other end of which is connected to the gas storage space.

2. The mine compressed air energy storage system with constant pressure gas film storage according to claim 1, characterized in that, The air film is connected to the bottom wall of the mine water pool.

3. The mine compressed air energy storage system with constant pressure gas film storage according to claim 1, characterized in that, The inner wall of the mine water tank is provided with a gas storage groove, and the gas membrane seals the gas storage groove.

4. The mine compressed air energy storage system with constant pressure gas film storage according to claim 1, characterized in that, The air film is provided with an air port, and the lower end of the air guide tube is connected to the air port.

5. The mine compressed air energy storage system with constant pressure gas film storage according to claim 1, characterized in that, The gas storage space is located below the liquid level of the pressurized water body.

6. The mine compressed air energy storage system with constant pressure gas film storage according to claim 1, characterized in that, The portion of the gas delivery pipe within the mine water tank extends vertically.

7. The mine compressed air energy storage system with constant pressure gas film storage according to claim 1, characterized in that, The gas filling and releasing system is located above the mine water pool.

8. The mine compressed air energy storage system with constant pressure gas film storage according to claim 1, characterized in that, The inflation / deflation system includes: An inflation branch, the outlet of which is connected to the air guide pipe; A venting branch, the inlet of which is connected to the vent pipe; The compressor, the outlet of which is connected to the inlet of the inflation branch; The motor is connected to the compressor via a drive connection; A turbine, wherein the inlet of the turbine is connected to the outlet of the venting branch; A generator, which is connected to the turbine via a drive mechanism.

9. The mine compressed air energy storage system with constant pressure gas film storage according to claim 8, characterized in that, The inflation / deflation system also includes: An air-filled heat exchanger having an air-filled flow channel and an air-filled medium flow channel, wherein the air-filled flow channel is connected to the air-filled branch. A venting heat exchanger, wherein the venting heat exchanger has a venting air flow channel and a venting medium flow channel, the venting air flow channel being connected to the venting branch; A cryogenic storage tank, wherein the cryogenic storage tank is suitable for storing a cryogenic heat exchange medium, the outlet of the cryogenic storage tank is connected to the inlet of the gas-filling medium flow channel, and the inlet of the cryogenic storage tank is connected to the outlet of the venting medium flow channel. A high-temperature storage tank, wherein the high-temperature storage tank is suitable for storing a high-temperature heat exchange medium, the inlet of the high-temperature storage tank is connected to the outlet of the gas-filling medium flow channel, and the outlet of the high-temperature storage tank is connected to the inlet of the venting medium flow channel.

10. The mine compressed air energy storage system with constant pressure gas storage according to claim 8, characterized in that, The inflation / deflation system also includes: An inflation valve, which is connected to the inflation branch; A venting valve is connected to the venting branch.

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