A compressed air and carbon dioxide energy storage system

Abstract

The utility model discloses a compressed air and carbon dioxide energy storage system of combining, utilize piston ring, plugging support plate, sealing washer and annular groove constitute novel air film structure, can guarantee the sufficient rise of this novel air film structure when carbon dioxide cavity is in the negative pressure state, provide sufficient space for the filling of air in air cavity, when carbon dioxide cavity fills in carbon dioxide, can carry out sufficient compression to the air in air cavity through novel air film structure, wherein the air cavity and carbon dioxide cavity space adjustment range is wider, and the energy storage capacity is greater, and cooperation the setting of auxiliary spring can also effectively reduce the friction loss between carbon dioxide cavity expansion and push novel air film structure down process and breathing energy storage tank, and energy storage tank adopts detachable design, can realize novel air film structure's convenient taking out replacement, can effectively reduce maintenance cost while reducing construction cost.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide energy storage, and more particularly to an energy storage system that combines compressed air and carbon dioxide energy storage. Background Technology

[0002] Compressed air energy storage technology is a physical energy storage technology that uses compressed air to store energy. It has advantages such as large energy storage capacity, high safety, economic efficiency, environmental friendliness, and technological maturity. It plays an important role in future energy systems, especially in promoting the use of renewable energy and improving grid stability.

[0003] Carbon dioxide energy storage, as a new technology, utilizes existing applications to convert atmospheric gaseous carbon dioxide into high-pressure liquid carbon dioxide using a multi-stage compressor during periods of low electricity prices, thus storing electrical energy as the internal energy of the carbon dioxide. During peak electricity demand periods, a multi-stage expander expands the high-pressure liquid carbon dioxide back into atmospheric gaseous carbon dioxide for power generation, ultimately achieving the storage and release of electrical energy. However, this system suffers from a significant cost. The investment cost for its atmospheric pressure carbon dioxide storage bladder is substantial, and the cost of technology promotion cannot be ignored.

[0004] As described in application number 202311173139.1, a compressed air-carbon dioxide hybrid energy storage system and its operation method use air as the working medium on the low-pressure side and carbon dioxide as the working medium on the high-pressure side. The compressed air and carbon dioxide gas share the same gas storage chamber and are separated by a flexible airbag to achieve exhaled energy storage. However, the flexible airbag usually adopts a fixed air-supported membrane structure design, which not only has high construction costs but also has the disadvantage of inconvenient maintenance. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an energy storage system that combines compressed air and carbon dioxide energy storage. This solves the problem that traditional compressed air energy storage technology typically uses an air-supported membrane structure design for flexible airbags, which not only has high construction costs but also inconvenient maintenance.

[0006] The specific technical solution is as follows: an energy storage system combining compressed air and carbon dioxide energy storage, including a carbon dioxide cold storage unit and an air energy storage unit;

[0007] The carbon dioxide cold storage unit includes a breathing gas storage tank, a liquefaction component, a liquid storage container, and a refrigeration component, which are connected in a closed loop via pipelines in sequence.

[0008] The breathing gas storage tank is used to provide a certain pressure for the gas inside the breathing gas storage tank. The breathing gas storage tank includes an air membrane, which divides the breathing gas storage tank into an air chamber and a carbon dioxide chamber. The pressure in the air chamber and the carbon dioxide chamber is equal. The carbon dioxide chamber is connected to the refrigeration component and is used to store the carbon dioxide discharged by the refrigeration component.

[0009] The liquefaction assembly includes a compression device and a cooling device. The compression device is connected to the carbon dioxide chamber and is used to pressurize the carbon dioxide. The cooling device is connected to the compression device and is used to cool the pressurized carbon dioxide to liquefy the carbon dioxide.

[0010] The liquid storage container is used to store liquid carbon dioxide;

[0011] The refrigeration component is connected to the liquid storage container and is used to vaporize and cool the liquid carbon dioxide to cool the external equipment that needs to be cooled. The vaporized gaseous carbon dioxide flows back to the carbon dioxide chamber.

[0012] The air energy storage unit includes an air compression component and a power generation component. The air compression component and the power generation component are respectively connected to an air cavity. The air compression component is used to compress air into the air cavity, and the power generation component is used to generate electricity when air is discharged from the air cavity.

[0013] Through the above technical solution, during nighttime when electricity prices are low, low-pressure gaseous carbon dioxide in the carbon dioxide chamber is compressed into high-pressure carbon dioxide by a carbon dioxide compressor. This high-pressure carbon dioxide is then liquefied by a cooling device to form supercritical liquid carbon dioxide, which is stored in a storage container, completing a carbon dioxide energy storage process. Simultaneously, the gaseous carbon dioxide in the air chamber decreases. To maintain a stable carbon dioxide output pressure, a multi-stage compressor on the air end compresses air into the air chamber, forming an air energy storage process. These two energy storage processes occur simultaneously. During the daytime when electricity prices are high, the liquid carbon dioxide in the storage container is depressurized and vaporized into gaseous carbon dioxide by a refrigeration component, releasing a large amount of cold energy. This cold energy can be used for community air conditioning or cold storage. The gaseous carbon dioxide eventually returns to the carbon dioxide chamber, completing a carbon dioxide energy release process. At the same time, as the amount of gaseous carbon dioxide in the carbon dioxide chamber increases, air needs to be expelled from the air chamber to maintain the pressure in the breathing gas storage tank. The high-pressure air is then discharged and connected to a turbine expander for power generation, realizing the air-side energy release process. These two energy release processes occur simultaneously.

[0014] Preferably, the energy storage system combining compressed air and carbon dioxide energy storage further includes a thermal circulation system. The thermal circulation system includes a hot water tank, a cold water tank, a first heat exchanger installed on the pipe between the refrigeration component and the carbon dioxide chamber, and a second heat exchanger installed on the pipe between the air compression component and the air chamber. The cold water in the cold water tank is used to remove the heat generated when the air compression component compresses air. After being heated, the cold water flows into the hot water tank. The hot water in the hot water tank is used to heat the refrigeration component to generate the discharged carbon dioxide. After being cooled by the carbon dioxide, the hot water flows into the cold water tank.

[0015] The above technical solution addresses the issue that energy storage and energy release processes are often not simultaneous. Therefore, hot water tanks and cold water tanks are added to store waste heat generated during energy storage and waste cold generated during energy release, and to facilitate heat exchange between the waste heat and waste cold.

[0016] Preferably, a liquefaction buffer tank is installed between the liquefaction component and the storage container. The cooling device is connected to the middle of the liquefaction buffer tank via a pipe. The bottom of the liquefaction buffer tank is connected to the storage container via a pipe. The top of the liquefaction buffer tank is connected to the pipe between the compression device and the cooling device via a pipe.

[0017] Through the above technical solution, the liquefaction buffer tank plays a buffering role, and gaseous carbon dioxide can be fully liquefied into liquid carbon dioxide.

[0018] Preferably, the pressure inside the breathing air tank is 3 MPa.

[0019] The above technical solution allows the pressure inside the carbon dioxide chamber to be maintained at 3 MPa, resulting in a smaller volume of carbon dioxide for the same mass, reducing the amount of gas film used and lowering investment costs. Simultaneously, it allows control of the refrigeration unit's output temperature to around -5°C, a temperature more suitable for use in community air conditioning or cold storage facilities.

[0020] Preferably, the pressure of the carbon dioxide compressed by the compression device is 7.5 MPa.

[0021] By using the above technical solution, the pressure of carbon dioxide can be controlled at 7.5 MPa, which allows gaseous carbon dioxide to liquefy at room temperature.

[0022] Preferably, the cooling device is an evaporative cooling device.

[0023] The above technical solutions can reduce the investment cost of cooling devices.

[0024] Preferably, the refrigeration assembly includes an expansion valve and a heat exchanger. The expansion valve is used to depressurize and vaporize liquid carbon dioxide. When the carbon dioxide depressurizes and vaporizes, it cools down and supplies cooling to external equipment that needs to be cooled through the heat exchanger.

[0025] The above technical solution can provide cooling for external equipment. At the same time, the heat absorbed by the external cooling equipment can increase the internal energy of gaseous carbon dioxide, eliminating the need to supplement internal energy by burning fossil fuels and further improving the energy conversion rate.

[0026] Preferably, the air compression assembly includes a primary compressor and a secondary compressor, the primary compressor and the secondary compressor are connected, the secondary compressor is connected to the air chamber, and air flows into the air chamber after being compressed by the primary compressor and the secondary compressor in sequence.

[0027] The above technical solution achieves air energy storage through multi-stage compression.

[0028] Preferably, the power generation component includes a primary leveling generator and a secondary leveling generator. The primary leveling generator is connected to the air chamber, and the secondary leveling generator is connected to the primary leveling generator. The air in the air chamber flows sequentially through the primary leveling generator and the secondary leveling generator to generate electricity before being discharged.

[0029] The above technical solution enables high-pressure gas power generation.

[0030] Preferably, the gas film includes a piston ring, a sealing support plate is fixedly installed inside the piston ring, a sealing ring is fitted and fixedly installed on the outer periphery of the piston ring, and a plurality of annular grooves are sequentially opened on the outer periphery of the sealing ring from top to bottom. A plurality of auxiliary rods are slidably installed through the top of the piston ring. Blind grooves that cooperate with the auxiliary rods are opened at the top and bottom of the inner cavity of the breathing gas tank. The outer periphery of the auxiliary rods and the inner wall of the breathing gas tank are coated with a diamond-like carbon coating. The outer periphery of the sealing ring is in contact with the diamond-like carbon coating and is slidably connected.

[0031] Preferably, a sleeve is connected to and fixedly installed in the middle of the top of the breathing gas tank, an auxiliary spring is fixedly installed in the top of the inner cavity of the sleeve, the bottom end of the auxiliary spring contacts the top of the sealing support plate, a guide rod is fixedly installed in the top of the sealing support plate, and the auxiliary spring is sleeved on the outer periphery of the guide rod.

[0032] The beneficial effects of this invention are as follows:

[0033] A novel air-film structure is constructed using piston rings, sealing plates, sealing rings, and annular grooves. When the carbon dioxide chamber is under negative pressure, this structure can rise fully, providing ample space for air to fill the air chamber. When carbon dioxide is filled into the carbon dioxide chamber, the air in the air chamber can be fully compressed through the novel air-film structure. The air chamber and carbon dioxide chamber have a wider range of space adjustment and greater energy storage capacity. In addition, the auxiliary spring effectively reduces frictional losses between the carbon dioxide chamber and the breathing energy storage tank during the descent of the novel air-film structure. Furthermore, the energy storage tank adopts a detachable design, allowing for convenient removal and replacement of the novel air-film structure. This reduces both construction and maintenance costs.

[0034] In the carbon dioxide cold storage section, the advantage of carbon dioxide being able to liquefy into a supercritical state under simple conditions of 7.5 MPa pressure and 31°C is utilized. The energy release process directly vaporizes liquid carbon dioxide to obtain cold energy. In this cold energy utilization section, cold energy at around -5°C is extracted for use in community air conditioning or cold storage, which greatly improves the energy conversion efficiency and utilization efficiency. This temperature has a wider range of applications, and the equipment can be miniaturized, greatly reducing the difficulty of popularization.

[0035] Compared to traditional atmospheric pressure carbon dioxide energy storage bladders, the 3MPa pressurized breathing gas tank not only reduces the investment cost of the bladder, but also only requires a small compressor and a hydraulic expansion valve to achieve the phase change of carbon dioxide, which greatly reduces the initial equipment investment cost in carbon dioxide energy storage.

[0036] On the air energy storage side, the advantages of more mature air energy storage compressor and turbo expander technologies and low air usage costs can be taken advantage of. On the other side of the pressurized 3Mpa breathing air tank, a more mature air energy storage system can be introduced to store air energy during the off-peak electricity price period and release energy during the peak electricity price period, so as to realize the dual functions of "cooling storage" and "electricity storage" of this system. Attached Figure Description

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

[0038] Figure 1 This is a schematic diagram of the structure of this utility model;

[0039] Figure 2 This is a schematic diagram of the internal structure of the breathing air tank of this utility model;

[0040] 1. Breathing air tank; 11. Air film; 111. Piston ring; 112. Sealing support plate; 113. Sealing ring; 114. Annular groove; 115. Auxiliary rod; 12. Air chamber; 13. Carbon dioxide chamber; 14. Blind groove; 15. Diamond-like carbon coating; 16. Sleeve; 17. Auxiliary spring; 18. Guide rod; 21. Compressor; 22. Evaporative cooling device; 3. Liquid storage tank; 31. Liquefaction buffer tank; 41. Pressure reducing valve; 42. Heat exchanger; 51. First-stage compressor; 52. Second-stage compressor; 53. First-stage leveling generator; 54. Second-stage leveling generator; 61. Hot water tank; 62. Cold water tank; 63. First heat exchanger; 64. Second heat exchanger. Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; however, the present invention may also be implemented in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0043] An energy storage system combining compressed air and carbon dioxide energy storage includes a carbon dioxide cold storage unit and an air energy storage unit. The carbon dioxide cold storage unit comprises a breathing gas tank 1, a liquefaction component, a liquid storage container, and a refrigeration component, all connected in a closed loop via pipelines. The breathing gas tank 1 consists of a tank body and a tank cover, with the cover and body sealed using a sealing ring and secured with bolts. The breathing gas tank 1 includes an air membrane 11, which divides the breathing gas tank 1 into an air chamber 12 and a carbon dioxide chamber 13. The pressure inside the breathing gas tank 1 is controlled at 3 MPa. The air chamber 12 and the carbon dioxide chamber 13 have equal pressure. The carbon dioxide chamber 13 is connected to the refrigeration unit and is used to store the carbon dioxide discharged by the refrigeration unit. Specifically, the gas film 11 includes a piston ring 111. A sealing support plate 112 is fixedly installed inside the piston ring 111. A sealing ring 113 is fitted and fixedly installed on the outer circumference of the piston ring 111. The sealing ring 113 is made of modified polytetrafluoroethylene material and is filled with 30% glass fiber to improve its compressive strength. The outer circumference of the sealing ring 113 has openings from top to bottom. Several annular grooves 114 are provided. Several auxiliary rods 115 are slidably installed through the top of the piston ring 111. Blind grooves 14 that cooperate with the auxiliary rods 115 are provided at the top and bottom of the inner cavity of the breathing air tank 1. The outer periphery of the auxiliary rods 115 and the inner wall of the breathing air tank 1 are coated with diamond-like carbon coating 15. The outer periphery of the sealing ring 113 contacts the diamond-like carbon coating 15 and is slidably connected. The sealing contact surface is coated with a 5μm thick diamond-like carbon coating to reduce the coefficient of friction and improve wear resistance.

[0044] Furthermore, a sleeve 16 is connected to and fixedly installed in the middle of the top of the breathing gas storage tank 1. An auxiliary spring 17 is fixedly installed in the top of the inner cavity of the sleeve 16. The bottom end of the auxiliary spring 17 contacts the top of the sealing support plate 112. A guide rod 18 is also fixedly installed in the top of the sealing support plate 112. The auxiliary spring 17 is sleeved on the outer periphery of the guide rod 18. The setting of the auxiliary spring 17 reduces the friction loss caused by the descent of the gas film 11 during power generation. This eliminates the need for a costly fixed gas-bearing membrane structure design, providing greater energy storage while having the advantages of low cost and easy maintenance.

[0045] The liquefaction assembly includes a compression device and a cooling device. In this embodiment, the compression device is a compressor 21, and the cooling device is an evaporative cooling device 22. The compressor 21 is connected to the carbon dioxide chamber 13 and is used to pressurize the carbon dioxide. The evaporative cooling device 22 is connected to the compressor 21 and is used to cool the carbon dioxide pressurized by the compressor 21, thereby liquefying the carbon dioxide.

[0046] The liquid storage container, in this embodiment, is a liquid storage tank 3, which is connected to the evaporative cooling device 22 and is used to store the liquid carbon dioxide that has been liquefied by the evaporative cooling device 22.

[0047] The refrigeration assembly includes a pressure reducing valve 41 and a heat exchanger 42. The pressure reducing valve 41 is connected to the liquid storage tank 3. The pressure reducing valve 41 reduces the pressure of liquid carbon dioxide, vaporizes it, and cools it down. The vaporized carbon dioxide then flows back to the carbon dioxide chamber 13.

[0048] The air energy storage unit includes an air compression assembly and a power generation assembly. The air compression assembly includes a primary compressor 51 and a secondary compressor 52, which are connected to each other. The secondary compressor 52 is connected to an air chamber 12. Air is compressed sequentially by the primary compressor 51 and the secondary compressor 52 before flowing into the air chamber 12. The power generation assembly includes a primary leveling generator 53 and a secondary leveling generator 54, which are connected to the air chamber 12. The secondary leveling generator 54 is connected to the primary leveling generator 53. Air in the air chamber 12 flows sequentially through the primary leveling generator 53 and the secondary leveling generator 54 to generate electricity before being discharged.

[0049] A liquefaction buffer tank 31 is installed between the evaporative cooling device 22 and the liquid storage tank 3. The evaporative cooling device 22 is connected to the middle of the liquefaction buffer tank 31 through a pipe, the bottom of the liquefaction buffer tank 31 is connected to the liquid storage tank 3 through a pipe, and the top of the liquefaction buffer tank 31 is connected to the pipe between the compressor 21 and the evaporative cooling device 22 through a pipe.

[0050] The energy storage system combining compressed air and carbon dioxide storage also includes a thermal cycle system. The thermal cycle system includes a hot water tank 61, a cold water tank 62, a first heat exchanger 63 installed on the pipe between the heat exchanger 42 and the carbon dioxide chamber 13, and a second heat exchanger 64 installed on the pipe between the secondary compressor 52 and the air chamber 12. The cold water in the cold water tank 62 is used to remove the heat generated during the air compression process. The heated cold water flows into the hot water tank 61, where it heats the carbon dioxide discharged from the heat exchanger 42. After being cooled by the carbon dioxide, the hot water flows into the cold water tank 62. Since the energy storage and release processes often do not occur simultaneously, the hot water tank 61 and the cold water tank 62 are added to store the waste heat generated during energy storage and the waste cold generated during energy release, and to facilitate heat exchange between the waste heat and cold.

[0051] During nighttime periods of low electricity prices, low-pressure gaseous carbon dioxide in the carbon dioxide chamber is compressed by compressor 21 to form high-pressure carbon dioxide. This high-pressure carbon dioxide is then liquefied by evaporative cooling device 22 to form supercritical liquid carbon dioxide, which is stored in storage tank 3, completing a carbon dioxide energy storage process. Simultaneously, the gaseous carbon dioxide in air chamber 12 decreases. To maintain a stable carbon dioxide output pressure, a multi-stage compressor at the air end compresses air into air chamber 12, forming an air energy storage process. These two energy storage processes occur simultaneously. During these processes, piston ring 111 rises and compresses auxiliary spring 17, causing the space in carbon dioxide chamber 13 to shrink and the space in air chamber 12 to expand.

[0052] During periods of high electricity prices in the daytime, the liquid carbon dioxide in storage tank 3 is depressurized and vaporized into gaseous carbon dioxide through pressure reducing valve 41, releasing a large amount of cooling energy. This cooling energy can be used for community air conditioning or cold storage. The gaseous carbon dioxide eventually returns to the carbon dioxide chamber, completing one carbon dioxide energy release process. Simultaneously, as the amount of gaseous carbon dioxide in carbon dioxide chamber 13 increases, air needs to be expelled from air chamber 12 to maintain the pressure inside the breathing gas storage tank. The high-pressure air is then expelled and sequentially generates electricity through primary leveling generator 53 and secondary leveling generator 54, realizing the energy release process at the air end. Both energy release processes occur simultaneously. During this process, piston ring 111 descends and resets and extends auxiliary spring 17, increasing the space in carbon dioxide chamber 13 and decreasing the space in air chamber 12.

[0053] In the carbon dioxide energy storage sector, the advantage of carbon dioxide being able to liquefy into a supercritical state under simple conditions of 7.5 MPa pressure and 31°C is utilized. The energy release process directly vaporizes liquid carbon dioxide to obtain cold energy. In terms of cold energy utilization, only cold energy at around -5°C is extracted for use in community air conditioning or cold storage, which greatly improves the energy conversion efficiency and utilization efficiency. This temperature range has a wider application range, and the equipment can be miniaturized, greatly reducing the difficulty of popularization.

[0054] Replacing the conventional atmospheric pressure carbon dioxide energy storage gasbag with a pressurized 3MPa breathing gas tank not only reduces the investment cost of the gasbag, but also requires only a small compressor and a hydraulic expansion valve to achieve the phase change of carbon dioxide, which greatly reduces the initial equipment investment cost in carbon dioxide energy storage.

[0055] On the air energy storage side, taking advantage of the more mature advantages of commercially available air energy storage compressors and turbo expanders, as well as the low cost of air usage, a more mature air energy storage system is introduced on the other side of the pressurized 3MPa breathing air tank. This system stores air energy during periods of low electricity prices and releases energy during periods of high electricity prices, thus realizing the dual functions of "cold storage" and "electricity storage" of this system.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An energy storage system combining compressed air and carbon dioxide energy storage, characterized in that: Includes carbon dioxide cold storage units and air energy storage units; The carbon dioxide cold storage unit includes a breathing gas storage tank, a liquefaction component, a liquid storage container, and a refrigeration component, which are connected in a closed loop via pipelines in sequence. The breathing gas storage tank is used to provide a certain pressure for the gas inside the breathing gas storage tank. The breathing gas storage tank includes an air membrane, which divides the breathing gas storage tank into an air chamber and a carbon dioxide chamber. The pressure in the air chamber and the carbon dioxide chamber is equal. The carbon dioxide chamber is connected to the refrigeration component and is used to store the carbon dioxide discharged by the refrigeration component. The liquefaction assembly includes a compression device and a cooling device. The compression device is connected to the carbon dioxide chamber and is used to pressurize the carbon dioxide. The cooling device is connected to the compression device and is used to cool the pressurized carbon dioxide to liquefy the carbon dioxide. The liquid storage container is used to store liquid carbon dioxide; The refrigeration component is connected to the liquid storage container and is used to vaporize and cool the liquid carbon dioxide to cool the external equipment that needs to be cooled. The vaporized gaseous carbon dioxide flows back to the carbon dioxide chamber. The air energy storage unit includes an air compression component and a power generation component. The air compression component and the power generation component are respectively connected to an air cavity. The air compression component is used to compress air into the air cavity, and the power generation component is used to generate electricity when air is discharged from the air cavity. The air film includes a piston ring, a sealing support plate is fixedly installed inside the piston ring, a sealing ring is fitted and fixedly installed on the outer periphery of the piston ring, and a number of annular grooves are opened sequentially from top to bottom on the outer periphery of the sealing ring. A number of auxiliary rods are slidably installed through the top of the piston ring. Blind grooves that cooperate with the auxiliary rods are opened at the top and bottom of the inner cavity of the breathing gas tank. The outer periphery of the auxiliary rods and the inner wall of the breathing gas tank are coated with diamond-like carbon coating. The outer periphery of the sealing ring is in contact with the diamond-like carbon coating and is slidably connected. A sleeve is connected to and fixedly installed in the middle of the top of the breathing gas storage tank. An auxiliary spring is fixedly installed in the top of the inner cavity of the sleeve. The bottom end of the auxiliary spring contacts the top of the sealing support plate. A guide rod is also fixedly installed in the top of the sealing support plate. The auxiliary spring is sleeved on the outer periphery of the guide rod.

2. The energy storage system combining compressed air and carbon dioxide energy storage according to claim 1, characterized in that: The system includes a heat circulation system comprising a hot water tank, a cold water tank, a first heat exchanger installed on a pipe between the refrigeration component and the carbon dioxide chamber, and a second heat exchanger installed on a pipe between the air compression component and the air chamber. The cold water in the cold water tank is used to remove the heat generated when the air compression component compresses air. After being heated, the cold water flows into the hot water tank. The hot water in the hot water tank is used to heat the refrigeration component to generate the discharged carbon dioxide. After being cooled by the carbon dioxide, the hot water flows into the cold water tank.

3. The energy storage system combining compressed air and carbon dioxide energy storage according to claim 1, characterized in that: A liquefaction buffer tank is installed between the liquefaction component and the storage container. The cooling device is connected to the middle of the liquefaction buffer tank via a pipe. The bottom of the liquefaction buffer tank is connected to the storage container via a pipe. The top of the liquefaction buffer tank is connected to the pipe between the compression device and the cooling device via a pipe.

4. The energy storage system combining compressed air and carbon dioxide energy storage according to claim 1, characterized in that: The pressure inside the breathing gas tank is 3 MPa.

5. The energy storage system combining compressed air and carbon dioxide energy storage according to claim 1, characterized in that: The pressure of the carbon dioxide compressed by the compression device is 7.5 MPa.

6. The energy storage system combining compressed air and carbon dioxide energy storage according to claim 1, characterized in that: The cooling device is an evaporative cooling device.

7. The energy storage system combining compressed air and carbon dioxide energy storage according to claim 1, characterized in that: The refrigeration assembly includes an expansion valve and a heat exchanger. The expansion valve is used to depressurize and vaporize liquid carbon dioxide. When the carbon dioxide depressurizes and vaporizes, it cools down and supplies cooling to external equipment that needs to be cooled through the heat exchanger. The air compression assembly includes a primary compressor and a secondary compressor. The primary compressor is connected to the secondary compressor, and the secondary compressor is connected to the air chamber. Air is compressed by the primary compressor and the secondary compressor in sequence and then flows into the air chamber. The power generation component includes a primary leveling generator and a secondary leveling generator. The primary leveling generator is connected to an air chamber, and the secondary leveling generator is connected to the primary leveling generator. The air in the air chamber flows through the primary leveling generator and the secondary leveling generator in sequence to generate electricity before being discharged.

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