Carbon dioxide energy storage system combined with flywheel structure

Abstract

The present invention belongs to the field of energy storage technology, and relates to a carbon dioxide energy storage system combined with a flywheel structure, including a compressor, a vacuum chamber, a main shaft, a flywheel rotor, and an electric power generation assembly. The flywheel rotor is sleeved on the main shaft, and the electric power generation assembly is arranged in the vacuum chamber. The electric power generation assembly is used to drive the main shaft to rotate by electric energy when the power consumption is low, so that the flywheel rotor rotates continuously, and the electric energy is converted into mechanical energy for storage. When the voltage is unstable, the main shaft is driven to rotate by the flywheel rotor, so that the mechanical energy is converted into electric energy, and the electric energy is transmitted to the compressor. The present invention can drive the main shaft to rotate by electric energy when the power consumption is low, so that the flywheel rotor rotates continuously, and the electric energy is converted into mechanical energy for storage. When the voltage is unstable, the main shaft is driven to rotate by the flywheel rotor, so that the mechanical energy is converted into electric energy, and the electric energy is transmitted to the compressor, so that the compressor can operate stably, avoid the compression power of the compressor from decreasing, and ensure the efficiency of energy storage.

Description

Technical Field

[0001] The invention belongs to the technical field of energy storage and relates to a carbon dioxide energy storage system combined with a flywheel structure. Background Art

[0002] As the proportion of renewable energy in society increases, the development prospects of energy storage technology are very broad. Energy storage technology refers to the technology of storing energy in a certain form or device and releasing it when needed. Its basic task is to overcome the temporal or local differences between energy supply and demand. By storing excess energy, energy can be released during peak demand, thereby improving the stability and efficiency of the energy system.

[0003] At present, existing energy storage technologies often adopt compressed carbon dioxide energy storage systems, using carbon dioxide as the working medium for energy storage. It mainly includes compressors, high-pressure gas storage tanks, turbines and heat exchangers. When electricity consumption is low, the carbon dioxide is compressed by the compressor and stored in the high-pressure gas storage tank. At the same time, the heat energy generated during the compression process is stored. When electricity consumption is peak, the stored high-pressure carbon dioxide expands through the turbine, driving the turbine to generate electricity and release energy.

[0004] However, due to the frequent instability of the power system, the voltage input to the carbon dioxide energy storage system is easily unstable, resulting in unstable operation of the compressor, which reduces the compression power of the compressor and affects the efficiency of energy storage. Summary of the invention

[0005] The object of the present invention is to provide a carbon dioxide energy storage system combined with a flywheel structure, which can prevent the carbon dioxide energy storage system from being affected by fluctuations as a whole when the voltage is unstable, thereby improving the efficiency of energy storage.

[0006] To achieve the above purpose, the present invention provides a specific technical solution of a carbon dioxide energy storage system combined with a flywheel structure as follows:

[0007] A carbon dioxide energy storage system combined with a flywheel structure, comprising a compressor, and further comprising:

[0008] Vacuum chamber, used to provide a vacuum environment.

[0009] The main shaft is arranged in the vacuum chamber, and the two ends of the main shaft are respectively rotatably connected to the inner wall of the vacuum chamber.

[0010] The flywheel rotor is sleeved on the main shaft.

[0011] The electric generator assembly is arranged in the vacuum chamber and is connected to the main shaft. The electric generator assembly is used to drive the main shaft to rotate through electric energy when the power consumption is low, so that the flywheel rotor rotates continuously, converting the electric energy into mechanical energy for storage, and when the voltage is unstable, the flywheel rotor drives the main shaft to rotate, so that the mechanical energy is converted into electric energy, and the electric energy is transmitted to the compressor.

[0012] The present invention is also characterized in that:

[0013] The electric power generation component includes: an electric generator, which is arranged in the vacuum chamber, and the output end of the electric generator is connected to the main shaft.

[0014] Radial magnetic bearings are respectively arranged near both ends of the main shaft, a thrust plate is arranged near one side of the flywheel rotor on the main shaft, a partition is arranged in the vacuum chamber at the other side of the flywheel rotor, a through hole is opened on the partition near the main shaft, the main shaft passes through the through hole, and a permanent magnet is arranged at a position on the partition opposite to the thrust plate, and the permanent magnet is annular.

[0015] A radial locator is arranged on the inner wall of the vacuum chamber near the side of the main shaft.

[0016] The interior of the main shaft is hollow, and a spiral tube is arranged inside the main shaft along its length direction. The two ends of the spiral tube pass through the end of the main shaft and the inner wall of the vacuum chamber respectively and are located outside the vacuum chamber. The spiral tube is rotatably sealed and connected to the inner wall of the vacuum chamber. One end of the spiral tube is connected to the first outlet of the cold water tank, and the other end of the spiral tube is connected to the first inlet of the heat mixing tank.

[0017] The inlet of the compressor is connected to the outlet of the low-pressure gas storage tank, the outlet of the compressor is connected to the high-pressure gas storage tank, the outlet of the high-pressure gas storage tank is connected to the inlet of the turbine, and the outlet of the turbine is connected to the inlet of the low-pressure gas storage tank.

[0018] A first heat exchanger is arranged between the compressor and the high-pressure gas storage tank, the first inlet of the first heat exchanger is connected to the outlet of the compressor, the first outlet of the first heat exchanger is connected to the inlet of the high-pressure gas storage tank, the second inlet of the first heat exchanger is connected to the second outlet of the cold water tank, the second outlet of the first heat exchanger is connected to the second inlet of the heat mixing tank, a second heat exchanger is arranged between the high-pressure gas storage tank and the turbine, the first inlet of the second heat exchanger is connected to the outlet of the high-pressure gas storage tank, the first outlet of the second heat exchanger is connected to the inlet of the turbine, the second inlet of the second heat exchanger is connected to the outlet of the heat mixing tank, and the second heat exchanger is connected to the cold water tank.

[0019] A third heat exchanger is arranged between the turbine and the low-pressure gas storage tank, the first inlet of the third heat exchanger is connected to the outlet of the turbine, the first outlet of the third heat exchanger is connected to the inlet of the low-pressure gas storage tank, the second inlet of the third heat exchanger is connected to the second outlet of the second heat exchanger, and the second outlet of the third heat exchanger is connected to the inlet of the cold water tank.

[0020] The carbon dioxide energy storage system combined with a flywheel structure of the present invention has the following advantages:

[0021] First, through the coordination of the compressor, vacuum chamber, main shaft, flywheel rotor and electric generator assembly, the main shaft can be driven to rotate by electric energy during low electricity consumption, so that the flywheel rotor can rotate continuously and the electric energy can be converted into mechanical energy for storage. When the voltage is unstable, the main shaft can be driven to rotate by the flywheel rotor, so that the mechanical energy is converted into electric energy, which is then transmitted to the compressor, so that the compressor can operate stably, avoiding the decrease of the compression power of the compressor and ensuring the efficiency of energy storage.

[0022] Second, through the coordination of flywheel energy storage and carbon dioxide energy storage, the large-scale and long-term energy storage characteristics of carbon dioxide energy storage are utilized as the main storage unit to meet energy needs on a long time scale, and the rapid response characteristics of flywheel energy storage are utilized to respond to energy needs in emergency situations, which can significantly increase the stability of carbon dioxide energy storage operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the vacuum chamber and flywheel rotor structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 3 It is a schematic diagram of the connection structure between the high-pressure gas storage tank and the vacuum chamber of the present invention.

[0026] Reference numerals:

[0027] 1. Main shaft, 2. Spiral tube, 3. Flywheel rotor, 4. Radial magnetic bearing, 5. Radial positioner, 6. Electric generator, 7. Permanent magnet, 8. Hub, 9. Seal, 10. Mechanical auxiliary bearing, 11. Control system, 12. Thrust plate, 13. Vacuum chamber, 14. High-pressure gas storage tank, 15. Low-pressure gas storage tank, 16. Compressor, 17. Cold water tank, 18. Turbine, 19. Mixing tank, 20. First heat exchanger, 21. Second heat exchanger, 22. Third heat exchanger. DETAILED DESCRIPTION

[0028] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, such as A and / or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two. The following terms "first" and "second" are used for descriptive purposes only and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0029] like Figure 1 , Figure 2 As shown, the present invention provides a carbon dioxide energy storage system combined with a flywheel structure, including a compressor 16, a vacuum chamber 13, a main shaft 1, a flywheel rotor 3 and an electric power generation component, the vacuum chamber 13 is used to provide a vacuum environment, the main shaft 1 is arranged in the vacuum chamber 13, and the two ends of the main shaft 1 are respectively rotatably connected to the inner wall of the vacuum chamber 13, the flywheel rotor 3 is sleeved on the main shaft 1, and the main shaft 1 can drive the flywheel rotor 3 to rotate, the electric power generation component is arranged in the vacuum chamber 13, and the electric power generation component is connected to the main shaft 1. The electric power generation component is used to drive the main shaft 1 to rotate through electric energy when the power consumption is low, so that the flywheel rotor 3 rotates continuously, and the electric energy is converted into mechanical energy for storage, and when the voltage is unstable, the main shaft 1 is driven to rotate through the flywheel rotor 3, so that the mechanical energy is converted into electric energy, and the electric energy is transmitted to the compressor 16, so that the compressor 16 can operate stably, avoid the compression power of the compressor from decreasing, and ensure the efficiency of energy storage. At the same time, the vacuum chamber 13 provides a vacuum environment for the flywheel rotor 3, and reduces the energy loss during the rotation of the flywheel rotor 3.

[0030] like Figure 1 As shown, the electric generator assembly includes: an electric generator 6, which is arranged in the vacuum chamber 13, and the output end of the electric generator 6 is connected to the main shaft 1.

[0031] like Figure 1 As shown, the flywheel rotor 3 is connected to the main shaft 1 via a hub 8 .

[0032] like Figure 1As shown, radial magnetic bearings 4 are respectively provided near both ends of the main shaft 1, and the two radial magnetic bearings 4 make the rotation of the main shaft 1 more stable, a thrust plate 12 is provided on the main shaft 1 near one side of the flywheel rotor 3, and a partition is provided in the vacuum chamber 13 at the other side of the flywheel rotor 3, a through hole is opened on the partition near the main shaft 1, and the main shaft 1 passes through the through hole, and a permanent magnet 7 is provided on the partition at a position opposite to the thrust plate 12, and the permanent magnet 7 is annular, and the cooperation between the thrust plate 12 and the permanent magnet 7 can prevent the flywheel rotor 3 from sliding along the main shaft 1 when rotating.

[0033] like Figure 1 As shown, a radial positioner 5 is provided on the inner wall of the vacuum chamber 13 near the side of the main shaft 1 , and the radial positioner 5 ensures the stable rotation of the main shaft 1 .

[0034] like Figure 1 , Figure 2 As shown, the interior of the main shaft 1 is hollow, and a spiral tube 2 is arranged inside the main shaft 1 along its length direction. The two ends of the spiral tube 2 pass through the end of the main shaft 1 and the inner wall of the vacuum chamber 13 respectively and are located outside the vacuum chamber 13. The spiral tube 2 is rotatably sealed and connected to the inner wall of the vacuum chamber 13. One end of the spiral tube 2 is connected to the first outlet of the cold water tank 17, and the other end of the spiral tube 2 is connected to the first inlet of the mixing tank 19. Low-temperature water is stored in the cold water tank 17. The low-temperature water enters the spiral tube 2 to cool the main shaft 1, the electric generator 6 and the two radial magnetic bearings 4. The low-temperature water enters the mixing tank 19 after the temperature rises.

[0035] like Figure 2 As shown, the inlet of the compressor 16 is connected to the outlet of the low-pressure gas tank 15, and the low-pressure gas tank 15 stores room-temperature low-pressure carbon dioxide. The outlet of the compressor 16 is connected to the high-pressure gas tank 14, and the outlet of the high-pressure gas tank 14 is connected to the inlet of the turbine 18. The outlet of the turbine 18 is connected to the inlet of the low-pressure gas tank 15. The room-temperature low-pressure carbon dioxide enters the compressor 16, is compressed by the compressor 16 to generate compression heat, and the room-temperature low-pressure carbon dioxide is converted into high-temperature and high-pressure carbon dioxide, which then enters the high-pressure gas tank 14 for storage.

[0036] like Figure 2As shown, a first heat exchanger 20 is provided between the compressor 16 and the high-pressure gas storage tank 14, a first inlet of the first heat exchanger 20 is connected to the outlet of the compressor 16, a first outlet of the first heat exchanger 20 is connected to the inlet of the high-pressure gas storage tank 14, a second inlet of the first heat exchanger 20 is connected to the second outlet of the cold water tank 17, and a second outlet of the first heat exchanger 20 is connected to the second inlet of the heat mixing tank 19, a second heat exchanger 21 is provided between the high-pressure gas storage tank 14 and the turbine 18, a first inlet of the second heat exchanger 21 is connected to the outlet of the high-pressure gas storage tank 14, a first outlet of the second heat exchanger 21 is connected to the inlet of the turbine 18, a second inlet of the second heat exchanger 21 is connected to the outlet of the heat mixing tank 19, the second heat exchanger 21 is connected to the cold water tank 17, and the high-temperature and high-pressure carbon dioxide coming out of the compressor 16 is discharged. It enters the first heat exchanger 20 and exchanges heat with the low-temperature water in the cold water tank 17. The high-temperature and high-pressure carbon dioxide becomes high-pressure carbon dioxide and enters the high-pressure gas storage tank 14. The low-temperature water becomes high-temperature water and enters the mixing tank 19 to mix with the water from the spiral tube 2 and then enter the second heat exchanger 21. During peak electricity consumption, the normal-temperature and high-pressure carbon dioxide from the high-pressure gas storage tank 14 is heated to become high-temperature and high-pressure carbon dioxide and then enters the turbine 18 to generate power. The high-temperature water becomes normal-temperature water. Through the cooperation of the first heat exchanger 20, the second heat exchanger 21 and the spiral tube 2, the heat generated in the flywheel energy storage process is mixed with the compression heat generated by the compressor 16, thereby increasing the temperature of the mixed water and facilitating the heating of the normal-temperature and high-pressure carbon dioxide, thereby avoiding unstable operation of the compressor 16 and affecting the thermal efficiency of the turbine 18.

[0037] like Figure 2 As shown, a third heat exchanger 22 is arranged between the turbine 18 and the low-pressure gas storage tank 15, a first inlet of the third heat exchanger 22 is connected to the outlet of the turbine 18, a first outlet of the third heat exchanger 22 is connected to the inlet of the low-pressure gas storage tank 15, a second inlet of the third heat exchanger 22 is connected to the second outlet of the second heat exchanger 21, and a second outlet of the third heat exchanger 22 is connected to the inlet of the cold water tank 17. After entering the turbine 18 to do work, the high-temperature and high-pressure carbon dioxide becomes low-temperature and low-pressure carbon dioxide and enters the third heat exchanger 22, and exchanges heat with the normal-temperature water from the second heat exchanger 21. The low-temperature and low-pressure carbon dioxide becomes normal-temperature and low-pressure carbon dioxide and enters the low-pressure gas storage tank 15, and the normal-temperature water becomes low-temperature water and enters the cold water tank 17. By setting the third heat exchanger 22, the temperature of the carbon dioxide after doing work can be increased to prevent the carbon dioxide from entering the compressor 16 at too low a temperature, thereby affecting the normal operation of the compressor 16.

[0038] Among them, the temperature of normal temperature and low pressure carbon dioxide is 31.5℃~32.5℃ and the pressure is 7.15Mpa~8Mpa, the temperature of high temperature and high pressure carbon dioxide is 35℃~36℃ and the pressure is 10Mpa~11Mpa, the temperature of low temperature water is 20℃~25℃, and the temperature of high temperature water is 80℃~90℃.

[0039] like Figure 3 As shown, the outlet of the high-pressure gas tank 14 is connected to the spiral tube 2. When the second heat exchanger 21 fails, the connection between the high-pressure gas tank 14 and the second heat exchanger 21 and between the cold water tank 17 and the spiral tube flow channel 2 can be closed, and the high-pressure gas tank 14 and the spiral tube 2 can be opened, so that normal temperature and high-pressure carbon dioxide enters the spiral tube 2 and is heated by the heat generated by the main shaft 1 and the electric generator 6.

[0040] The present invention provides a carbon dioxide energy storage system combined with a flywheel structure, further comprising a control module, the control module being electrically connected to the electric generator 6, the electric generator 6 being electrically connected to the compressor 16, and the control module being used to control the switching of the working state of the electric generator 6.

[0041] Working principle:

[0042] When electricity consumption is low, the energy storage stage is entered. The room temperature and low pressure carbon dioxide in the low pressure gas storage tank 15 enters the compressor 16. The external electric energy drives the compressor 16 to work, so that the room temperature and low pressure carbon dioxide becomes high temperature and high pressure carbon dioxide. Then the high temperature and high pressure carbon dioxide enters the first heat exchanger 20, and exchanges heat with the low temperature water in the cold water tank 17. The high temperature and high pressure carbon dioxide becomes high pressure carbon dioxide and enters the high pressure gas storage tank 14. The low temperature water becomes high temperature water and enters the heat mixing tank 19. At the same time, the control module controls the electric generator 6 to enter the working state of the motor, so that the external electric energy drives the electric generator 6 to work, the electric generator 6 drives the main shaft 1 to rotate, and the main shaft 1 drives the flywheel rotor 3 to rotate, so that the electric energy is converted into mechanical energy, and in a small part of the electricity Under the input of energy, the flywheel rotor 3 keeps rotating, and the mechanical energy stored in the flywheel rotor 3 is kept not less than 85% of the maximum storage. At the same time, the low-temperature water in the cold water tank 17 enters the spiral tube 2 to cool the main shaft 1, the electric generator 6 and the two radial magnetic bearings 4. After the temperature of the low-temperature water increases, it enters the mixing tank 19. When the power system is unstable, the control module controls the electric generator 6 to enter the working state of the generator, and connects the electric generator 6 and the compressor 16. The main shaft 1 is driven to rotate through the flywheel rotor 3, so that the mechanical energy is converted into electrical energy, and the electrical energy is transmitted to the compressor 16 to ensure the stable operation of the compressor 16, thereby maintaining the stable operation of the carbon dioxide energy storage through the short-term high-power characteristics of the flywheel rotor 3.

[0043] During peak electricity consumption, the energy release stage begins. The high-temperature water in the heat mixing tank 19 enters the second heat exchanger 21 for heat exchange with the normal temperature and high pressure carbon dioxide from the high-pressure gas storage tank 14. The normal temperature and high pressure carbon dioxide becomes high temperature and high pressure carbon dioxide, and the high temperature water becomes normal temperature water. After entering the turbine 18 to do work, the high temperature and high pressure carbon dioxide becomes low temperature and low pressure carbon dioxide and enters the third heat exchanger 22. It exchanges heat with the normal temperature water from the second heat exchanger 21. The low temperature and low pressure carbon dioxide becomes normal temperature and low pressure carbon dioxide and enters the low pressure gas storage tank 15. The normal temperature water becomes low temperature water and enters the cold water tank 17.

[0044] When the carbon dioxide energy storage fails during the energy storage stage, the external input electric energy directly acts on the flywheel energy storage, and the energy storage threshold is set to 85% of the maximum energy storage of the flywheel energy storage. When a large amount of stable and high-power electric energy output is required in a short time, the flywheel rotor 3 directly drives the electric generator 6 to generate electricity for external output. For electric energy that cannot be released in a short time, the flywheel rotor 3 drives the electric generator 6 to generate electricity instead of the turbine 18 for external output. When the second heat exchanger 21 fails, the connection between the high-pressure gas storage tank 14 and the second heat exchanger 21, and between the cold water tank 17 and the spiral tube 2 are closed, and the liquid in the spiral tube flow channel 2 is quickly discharged into the mixing tank 19, and then the high-pressure gas storage tank 14 and the spiral tube 2 are opened, and the room temperature and high pressure carbon dioxide is connected to the spiral tube 2 to heat the room temperature and high pressure carbon dioxide through the heat of the flywheel energy storage, and then it is connected to the turbine 18 for expansion output.

[0045] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A carbon dioxide energy storage system in combination with a flywheel structure, comprising a compressor (16), characterized in that: Also includes: A vacuum chamber (13), used for providing a vacuum environment; A main shaft (1) is arranged in a vacuum chamber (13), and two ends of the main shaft (1) are rotatably connected to the inner wall of the vacuum chamber (13); A flywheel rotor (3) is sleeved on the main shaft (1); An electric power generation assembly is arranged in the vacuum chamber (13), the electric power generation assembly is connected to the main shaft (1), and the electric power generation assembly is used to drive the main shaft (1) to rotate by electric energy when the power consumption is low, so that the flywheel rotor (3) rotates continuously, converts the electric energy into mechanical energy for storage, and when the voltage is unstable, drives the main shaft (1) to rotate by the flywheel rotor (3), so that the mechanical energy is converted into electric energy, and the electric energy is transmitted to the compressor (16); The main shaft (1) is hollow inside, and a spiral tube (2) is arranged inside the main shaft (1) along its length direction. The two ends of the spiral tube (2) pass through the end of the main shaft (1) and the inner wall of the vacuum chamber (13) respectively and are located outside the vacuum chamber (13). The spiral tube (2) is rotatably sealed and connected to the inner wall of the vacuum chamber (13). One end of the spiral tube (2) is connected to a first outlet of a cold water tank (17), and the other end of the spiral tube (2) is connected to a first inlet of a heat mixing tank (19). The inlet of the compressor (16) is connected to the outlet of the low-pressure gas storage tank (15), the outlet of the compressor (16) is connected to the high-pressure gas storage tank (14), the outlet of the high-pressure gas storage tank (14) is connected to the inlet of the turbine (18), and the outlet of the turbine (18) is connected to the inlet of the low-pressure gas storage tank (15); A first heat exchanger (20) is provided between the compressor (16) and the high-pressure gas storage tank (14); a first inlet of the first heat exchanger (20) is connected to the outlet of the compressor (16); a first outlet of the first heat exchanger (20) is connected to the inlet of the high-pressure gas storage tank (14); a second inlet of the first heat exchanger (20) is connected to the second outlet of the cold water tank (17); a second outlet of the first heat exchanger (20) is connected to the second inlet of the heat mixing tank (19); a second heat exchanger (21) is provided between the high-pressure gas storage tank (14) and the turbine (18); a first inlet of the second heat exchanger (21) is connected to the outlet of the high-pressure gas storage tank (14); a first outlet of the second heat exchanger (21) is connected to the inlet of the turbine (18); a second inlet of the second heat exchanger (21) is connected to the outlet of the heat mixing tank (19); and the second heat exchanger (21) is in communication with the cold water tank (17).

2. The carbon dioxide energy storage system combined with a flywheel structure according to claim 1, characterized in that: The electric power generation assembly comprises: an electric generator (6) arranged in a vacuum chamber (13); an output end of the electric generator (6) is connected to a main shaft (1).

3. The carbon dioxide energy storage system combined with a flywheel structure according to claim 1, characterized in that: Radial magnetic bearings (4) are respectively arranged near both ends of the main shaft (1); a thrust plate (12) is arranged near one side of the flywheel rotor (3) on the main shaft (1); a partition is arranged in the vacuum chamber (13) at the other side of the flywheel rotor (3); a through hole is opened at a position of the partition near the main shaft (1); the main shaft (1) passes through the through hole; a permanent magnet (7) is arranged at a position on the partition opposite to the thrust plate (12); and the permanent magnet (7) is annular.

4. The carbon dioxide energy storage system combined with a flywheel structure according to claim 1, characterized in that: A radial positioner (5) is arranged on the inner wall of the vacuum chamber (13) at a position close to the side of the main shaft (1).

5. The carbon dioxide energy storage system combined with a flywheel structure according to claim 1, characterized in that: A third heat exchanger (22) is provided between the turbine (18) and the low-pressure gas storage tank (15); a first inlet of the third heat exchanger (22) is connected to the outlet of the turbine (18); a first outlet of the third heat exchanger (22) is connected to the inlet of the low-pressure gas storage tank (15); a second inlet of the third heat exchanger (22) is connected to the second outlet of the second heat exchanger (21); and a second outlet of the third heat exchanger (22) is connected to the inlet of the cold water tank (17).

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