Salt cavern compressed air energy storage gas release system and method

Abstract

The application provides a salt cavern compressed air energy storage gas release system and a gas release method, and belongs to the technical field of compressed air energy storage. The salt cavern compressed air energy storage gas release system comprises a salt cavern gas storage device, a first heat exchanger, a second heat exchanger and a gas-liquid separator. The gas outlet pipeline of the salt cavern gas storage device is sequentially connected with the first heat exchanger, the second heat exchanger and the gas-liquid separator. The outlet of the gas-liquid separator is connected with an application device through the heat exchange end of the first heat exchanger. The salt cavern compressed air energy storage gas release system separates and removes the brine carried in the compressed air, so that the compressed air with high purity enters the application device, the compressed air carrying the brine is prevented from eroding and damaging the downstream device, and the purified compressed air is heated again through the first heat exchanger and the heat exchange medium after absorbing heat, so that the heat in the underground salt cavern is effectively utilized to improve the system efficiency.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, specifically to a salt cavern compressed air energy storage release system and release method. Background Technology

[0002] Salt cavern compressed air energy storage systems utilize salt caverns as their gas storage devices. These caverns are cavities formed by dissolving salt layers in fresh water. Salt cavern compressed air energy storage technology is a method that leverages existing abandoned salt caverns for gas storage, turning waste into treasure. It boasts advantages such as large storage capacity, abundant resources, long service life, and safety and environmental friendliness. However, in practice, the large volume and high brine content of salt cavern cavities make it difficult to fully utilize them. Furthermore, the compressed air carries brine during release, which can generate droplets during the energy release phase. These droplets can then erode downstream critical equipment, causing damage and posing safety risks to the system's operation. Summary of the Invention

[0003] Therefore, the present invention provides a gas release system and gas release method for compressed air energy storage in salt caverns.

[0004] To solve the above-mentioned technical problems, the present invention provides a salt cavern compressed air energy storage and release system, comprising:

[0005] Salt cavern gas storage device, first heat exchanger, second heat exchanger, gas-liquid separator;

[0006] The gas outlet pipeline of the salt cavern gas storage device is sequentially connected to the first heat exchanger, the second heat exchanger, and the gas-liquid separator. The outlet of the gas-liquid separator is connected to the application equipment through the heat exchange end of the first heat exchanger.

[0007] Optionally, when the compressed air in the salt cavern gas storage device enters the first heat exchanger, it exchanges heat with the heat exchange medium in the first heat exchanger to reduce the temperature.

[0008] The compressed air entering the first heat exchanger from the gas-liquid separator exchanges heat with the heat exchange medium after absorbing heat to increase the temperature.

[0009] Optionally, an air-cooled fan may also be included, located on one side of the second heat exchanger.

[0010] Optionally, the liquid outlet of the gas-liquid separator is connected to a drainage system.

[0011] Optionally, it also includes a power generation system and an energy storage system, wherein the outlet of the heat storage tank between the power generation system and the energy storage system is connected to the salt cavern gas storage device.

[0012] Optionally, the energy storage system includes an electric motor and a multi-stage compressor coaxially connected thereto, wherein the outlet of each compressor in the multi-stage compressor is connected to a heat storage tank.

[0013] Optionally, the heat storage tank is connected to the final stage compressor in a multi-stage compressor.

[0014] Optionally, the power generation system includes a generator and a multi-stage expander coaxially connected thereto. The heat storage tank is connected to each of the multi-stage expanders, wherein the final expander in the multi-stage expander is open to the atmosphere.

[0015] A gas release method is also provided, including the aforementioned salt cavern compressed air energy storage gas release system, and further including the following steps:

[0016] After exiting the salt cavern storage device, the compressed air enters the first heat exchanger, where it undergoes heat exchange and cooling. It then enters the second heat exchanger for secondary cooling. The cooled compressed air then enters the gas-liquid separator for gas-liquid separation. The separated compressed air then re-enters the first heat exchanger to exchange heat with the heat exchange medium that has absorbed heat in the first heat exchanger, thereby increasing the temperature of the compressed air before it enters the application equipment.

[0017] Optionally, when the compressed air is cooled in the second heat exchanger, the cooling effect may also be enhanced by using an air-cooled fan.

[0018] The technical solution of this invention has the following advantages:

[0019] 1. The salt cavern compressed air energy storage and release system provided by the present invention comprises a salt cavern gas storage device connected in sequence to a first heat exchanger, a second heat exchanger, and a gas-liquid separator. Compressed air from the salt cavern gas storage device is cooled by passing through the first and second heat exchangers in sequence, and then undergoes gas-liquid separation by the gas-liquid separator to remove the brine carried in the compressed air, so as to obtain compressed air with higher purity and enter the application equipment, thereby avoiding the erosion and damage of downstream equipment by compressed air carrying brine. At the same time, the purified compressed air passes through the first heat exchanger again to exchange heat and heat up with the heat exchange medium after absorbing heat, effectively utilizing the heat in the underground salt cavern to improve system efficiency.

[0020] 2. The salt cavern compressed air energy storage and release system provided by the present invention has an air-cooled fan on one side of the second heat exchanger, which can further improve the cooling efficiency of the second heat exchanger for compressed air.

[0021] 3. The salt cavern compressed air energy storage and release system provided by the present invention can reduce the corrosion of multi-stage expanders, multi-stage compressors and their pipelines by purifying the compressed air. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific 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 from these drawings without creative effort.

[0023] Figure 1 This is a front view of ... provided in the first embodiment of the present invention;

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Salt cavern gas storage device; 2. First heat exchanger; 3. Second heat exchanger; 4. Air-cooled fan; 5. Gas-liquid separator; 6. Generator; 7. Multistage expander; 8. First-stage expander; 9. Last-stage expander; 10. Electric motor; 11. Multistage compressor; 12. First-stage compressor; 13. Last-stage compressor. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] 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 based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] This embodiment provides a specific implementation of a salt cavern compressed air energy storage and release system, such as... Figure 1 As shown, the system includes a salt cavern gas storage device 1, a first heat exchanger 2, a second heat exchanger 3, and a gas-liquid separator 5. The salt cavern gas storage device 1 is sequentially connected to the first heat exchanger 2, the second heat exchanger 3, and the gas-liquid separator 5. Compressed air exiting the salt cavern gas storage device 1 is cooled by passing through the first heat exchanger 2 and the second heat exchanger 3, and then undergoes gas-liquid separation in the gas-liquid separator 5 to remove the brine carried in the compressed air, thus obtaining high-purity compressed air that enters the application equipment. This prevents compressed air carrying brine from eroding and damaging downstream equipment. At the same time, the purified compressed air passes through the first heat exchanger 2 again to exchange heat with the heat exchange medium that has absorbed heat, effectively utilizing the heat in the underground salt cavern to improve system efficiency.

[0032] Specifically, the first heat exchanger 2 has at least three channels: one for compressed air flowing out of the salt cavern gas storage device 1; one for the heat exchange medium; and another for compressed air after gas-liquid separation. This allows the cooled compressed air to be heated again by using the heat in the underground salt cavern, effectively utilizing the heat in the underground salt cavern to improve system efficiency.

[0033] In this embodiment, an air-cooled fan 4 is provided on one side of the second heat exchanger 3, which can further improve the cooling efficiency of the second heat exchanger 3 for compressed air.

[0034] In this embodiment, a power generation system and an energy storage system are also included. A heat storage tank is provided between the power generation system and the energy storage system. The heat storage tank is connected to the salt cavern gas storage device 1, so that excess compressed air in the heat storage tank can enter the salt cavern gas storage device 1 for storage.

[0035] Specifically, the energy storage system includes an electric motor 10 and a multi-stage compressor 11 coaxially connected to the electric motor 10. The outlet of each compressor in the multi-stage compressor 11 is connected to a heat storage tank. The heat storage tank is connected to the last stage compressor 13 in the multi-stage compressor 11, so that the compressor can also use compressed air from the heat storage tank when performing compression. The first stage compressor 12 in the multi-stage compressor 11 is connected to the atmosphere and compresses and heats the atmosphere.

[0036] The power generation system includes a generator 6 and a multi-stage expander 7 coaxially connected to the generator 6. The heat storage tank is connected to each expander in the multi-stage expander 7. The final expander 9 in the multi-stage expander 7 is connected to the atmosphere. The outlet of the first expander 8 in the multi-stage expander 7 is connected to the heat storage tank, so that the compressed air expanded by the first expander 8 can also enter the heat storage tank.

[0037] Purified compressed air can reduce corrosion of equipment such as the multi-stage expander 7, multi-stage compressor 11, and their pipelines.

[0038] Example 2

[0039] This embodiment provides a specific implementation of the gas release method, which is carried out using the salt cavern compressed air energy storage and gas release system in Embodiment 1, and also includes the following steps: After the compressed air comes out of the salt cavern gas storage device 1, it enters the first heat exchanger 2, where it undergoes heat exchange and cooling. Then it enters the second heat exchanger 3 for secondary cooling. The cooled compressed air enters the gas-liquid separator 5 for gas-liquid separation. The separated compressed air re-enters the first heat exchanger 2 and exchanges heat with the heat exchange medium that has absorbed heat in the first heat exchanger 2, thereby increasing the temperature of the compressed air before it enters the application equipment.

[0040] Specifically, when the compressed air is cooled in the second heat exchanger 3, the cooling effect is further enhanced by using an air-cooled fan 4.

[0041] By cooling and separating the compressed air in the salt cavern gas storage device 1, the brine carried by the compressed air is eliminated, reducing the risk of erosion damage to downstream equipment. It can also reduce corrosion of equipment such as the multi-stage expander 7, multi-stage compressor 11 and their pipelines. At the same time, the heat of the compressed air in the salt cavern is used by the first heat exchanger 2 to continue to heat the purified compressed air, so that the compressed air entering the heat storage tank has a certain temperature, thereby improving the system efficiency.

[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A salt cavern compressed air energy storage gas release system, characterized by, The application relates to a salt-cave gas storage device (1), a first heat exchanger (2), a second heat exchanger (3) and a gas-liquid separator (5). The gas outlet pipeline of the salt-cave gas storage device (1) is sequentially connected with the first heat exchanger (2), the second heat exchanger (3) and the gas-liquid separator (5), and the outlet of the gas-liquid separator (5) is connected with an application device through the heat exchange end of the first heat exchanger (2). The application further relates to a gas releasing method, which comprises the following steps: After compressed air is discharged from the salt-cave gas storage device (1), the compressed air enters the first heat exchanger (2) to be cooled, enters the second heat exchanger (3) to be cooled again, enters the gas-liquid separator (5) to be separated, and then enters the first heat exchanger (2) to be heated by the heat exchange medium in the first heat exchanger (2) so as to increase the temperature of the compressed air and enter the application device. When the compressed air is cooled in the second heat exchanger (3), the air cooling fan (4) is used to enhance the cooling effect. When the compressed air in the salt-cave gas storage device (1) enters the first heat exchanger (2), the compressed air is heated by the heat exchange medium in the first heat exchanger (2) to reduce the temperature.

2. The salt cavern compressed air energy storage bleed system of claim 1, wherein, The compressed air in the gas-liquid separator (5) is heated by the heat exchange medium after absorbing heat to increase the temperature. The air cooling fan (4) is arranged on one side of the second heat exchanger (3).

3. The salt cavern compressed air energy storage bleed system of claim 1, wherein, The liquid outlet of the gas-liquid separator (5) is connected with a drainage system.

4. The salt cavern compressed air energy storage bleed system of claim 1, wherein, The application further relates to a power generation system and an energy storage system, and the outlet of a heat storage tank between the power generation system and the energy storage system is connected with the salt-cave gas storage device (1).

5. The salt cavern compressed air energy storage bleed system of claim 1, wherein, The energy storage system comprises an electric motor (10) and a multi-stage compressor (11) coaxially connected with the electric motor (10), and the outlet of each compressor in the multi-stage compressor (11) is connected with the heat storage tank.

6. The salt cavern compressed air energy storage bleed system of claim 5, wherein, The heat storage tank is connected with the last-stage compressor (13) in the multi-stage compressor (11).

7. The salt cavern compressed air energy storage bleed system of claim 6, wherein, The power generation system comprises a power generator (6) and a multi-stage expander (7) coaxially connected with the power generator (6), and the heat storage tank is connected with each expander in the multi-stage expander (7), wherein the last-stage expander (9) in the multi-stage expander (7) is connected with the atmosphere.

8. The salt cavern compressed air energy storage bleed air system of claim 5, wherein, ​

Images