Carbon dioxide energy storage device and use method

Abstract

The invention relates to the technical field of carbon dioxide energy storage, in particular to a carbon dioxide energy storage device which comprises an energy storage tank, a connecting pipe and a protective shell covering the periphery of the energy storage tank, cover plates are movably connected to the opposite side walls of the two sides of the protective shell through pin shafts, and a shielding frame for correspondingly shielding and sealing is installed on one side of a ventilation opening. A hydraulic part is mounted on the bottom side of the shielding frame; a matching block is arranged on the inner bottom wall of the protective shell, a penetrating channel for sealing the end of the connecting pipe is formed in the outer wall of the cover plate, ventilation and unfolding can be conducted when carbon dioxide is captured through the energy storage device, an inner tank body is stabilized when the energy storage device is transported and connected into an energy storage system, and a closed heat insulation environment is provided. The carbon dioxide liquid storage tank body can be directly applied to the energy storage system from the trapping stage, the step of repeated running of traditional liquid carbon dioxide is reduced, and the application effect of the energy storage tank is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide energy storage, and in particular to a carbon dioxide energy storage device and a usage method thereof. Background Art

[0002] A carbon dioxide energy storage device is a new type of physical energy storage technical equipment based on the principle of gas-liquid mutual conversion and two-state coordination. It realizes the storage and release of electric energy through the physical phase change of carbon dioxide, and has characteristics such as high efficiency, flexibility, and environmental protection, and can adapt to multiple scenarios on the power supply side, grid side, and user side.

[0003] The Chinese Patent Network discloses a publication number of: CN114962976A, which discloses a general compressed air energy storage flexible storage tank device. The use of gas sub-storage technology can reduce the manufacturing difficulty of high-pressure gas storage tanks, reduce the siting difficulty of compressed air energy storage projects and the dependence on mine cave gas storage. The compressed air energy storage flexible storage tank device can be used for high-pressure compressed air storage in underground, semi-underground and above-ground engineering environments, and can also adjust the number of flexible storage tank devices according to the demand of the installed capacity of compressed air energy storage, improving the flexibility of the installed capacity and siting of compressed air energy storage projects.

[0004] When the above energy storage tank is directly arranged in the energy storage system, it is necessary to fill the carbon dioxide captured from the outside into the energy storage tank. However, before this process, the captured carbon dioxide usually needs to be stored in a transfer carrier (such as a high-pressure liquid storage tank) first, and then the liquid carbon dioxide in the transfer carrier is transferred to the individual energy storage tanks in the energy storage unit through a series of equipment by transportation. This multi-step transportation and transfer process increases the complexity of the operation, making it more troublesome when new liquid carbon dioxide is replenished in the energy storage system. Summary of the Invention

[0005] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the above-mentioned problem that the steps are relatively cumbersome when capturing and transferring carbon dioxide to the energy storage system, the present invention is proposed.

[0007] Therefore, the purpose of the present invention is to provide a carbon dioxide energy storage device.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a carbon dioxide energy storage device, comprising an energy storage tank and a connecting pipe, and also comprising a protective shell covering the periphery of the energy storage tank, the opposite side walls of the protective shell are movably connected with a cover plate through a pin shaft, the outer wall of the cover plate is installed with an arc-shaped rack, the top of the protective shell is installed with a transmission tooth engaged with the arc-shaped rack, the opposite side walls of the protective shell are provided with a vent for storing liquid, one side of the vent is provided with a shielding frame for corresponding shielding and closure, the top side of the shielding frame is installed with a toothed plate that passes through the top side of the protective shell, and the toothed plate is engaged with the transmission tooth, the bottom side of the shielding frame is installed with a hydraulic component, and the protective shell can form an insulating environment isolated from the outside world after the cover plate and the shielding frame are moved into place; the inner bottom wall of the protective shell is provided with a matching block, and the outer wall of the cover plate is provided with a through channel for sealing the end of the connecting pipe.

[0009] As a preferred solution of the carbon dioxide energy storage device described in the present invention, the shielding frame is attached to one side of the inner wall of the protective shell, and the shielding frame is driven by hydraulic components to block one side of the vent. When the shielding frame moves, the tooth plate, transmission teeth and arc-shaped rack are driven together, and the cover plate is also closed on the protective shell at this time, and a sealing gasket is provided at the connection between the cover plate and the protective shell.

[0010] As a preferred solution of the carbon dioxide energy storage device described in the present invention, a sealing ring is placed on the inner wall of the through-channel, the outer ring of the sealing ring is kept in contact with the inner wall of the through-channel, a sealing plate is provided at the port of the connecting pipe, and the inner ring diameter of the sealing ring is slightly smaller than the outer ring diameter of the sealing plate.

[0011] As a preferred solution of the carbon dioxide energy storage device described in the present invention, wherein: a sleeve is installed on the outer wall of the cover plate, a bent connecting rod is sleeved on the inner wall of the sleeve, one end of the bent connecting rod is connected to the end of the sealing ring, and a touch-pressure seesaw is installed on the outer wall of the other side of the cover plate, one end of the touch-pressure seesaw is connected to the other end of the bent connecting rod.

[0012] As a preferred solution of the carbon dioxide energy storage device described in the present invention, the energy storage tank is provided with external reinforcing ribs on the outside, and each group of energy storage tanks is provided with two groups of mirror-image external reinforcing ribs on the outside, the inner top wall and the inner bottom wall of the protective shell are each installed with two groups of sliding grooves, each group of sliding grooves slidingly supports four groups of sliding rods, and every two groups of sliding rods support one end of the external reinforcing rib as a group, and the sliding rod is connected to the end of the external reinforcing rib, which plays a supporting and guiding role for the external reinforcing rib.

[0013] As a preferred embodiment of the carbon dioxide energy storage device of the present invention, wherein: a steering plate connected to the protective housing is installed on one side of the connecting rod. The middle section of the steering plate is movably connected to the inner wall of the protective housing through a pin shaft. The top end of the steering plate is connected to a group of sliding rods through a movable rod body, and the bottom end of the steering plate is connected to another group of sliding rods through a movable rod body.

[0014] As a preferred embodiment of the carbon dioxide energy storage device of the present invention, wherein: a transmission frame is installed on the inner wall of the protective housing. A plurality of support rods are installed through the transmission frame. One end of the support rod is connected to the outer wall of the outer reinforcing rib, and an inclined block is installed at the end of the support rod located inside the transmission frame.

[0015] As a preferred embodiment of the carbon dioxide energy storage device of the present invention, wherein: an inclined block is installed on the outer wall of the shielding frame. The inclined block is located on the bottom side of the inclined block below. When the shielding frame moves upward, the inclined block below is also pressed to drive the outer reinforcing rib to move.

[0016] As a preferred embodiment of the carbon dioxide energy storage device of the present invention, wherein: an offset display column is installed on the top of the transmission frame. A piston member is movably arranged inside the offset display column. The piston rod of the piston member penetrates into the inside of the transmission frame. A colored liquid is filled between the piston member and the offset display column. An inclined convex edge is installed on the top of the inclined block below, and the inclined convex edge is located on the bottom side of the piston member. A scale line is provided on the outer surface of the offset display column.

[0017] A method for using a carbon dioxide energy storage device, which is applied to the above-mentioned carbon dioxide energy storage device. The method includes the following steps: When in the carbon dioxide collection area, the produced carbon dioxide is liquefied and pressurized into the energy storage tank through a compressor. During the pressurization process, the surrounding of the energy storage tank is kept ventilated to avoid high environmental carbon dioxide concentration caused by air leakage. When preparing for transportation, the energy storage device changes from an open state to a closed state, which is beneficial for temperature control of the energy storage device. And when switching to the closed state, the internal energy storage tank can be strengthened to improve the stability of liquid carbon dioxide transportation.

[0018] When the energy storage device is transported to the original energy storage system, it can be directly incorporated into the energy storage system, so that the energy storage system is composed of multiple such energy storage devices, which is more beneficial for the management and maintenance of the energy storage system. At this time, the closed environment formed by the protective shell is more convenient for regulating the temperature of the energy storage tank, and the deformation of the outer shell of the energy storage tank can be sensed by the offset display column, which is convenient for the maintenance of the staff.

[0019] Beneficial effects The technical solution provided by the present invention has the following beneficial effects compared with the known prior art: 1. The energy storage device can be ventilated and deployed during carbon dioxide capture, and can stabilize the internal tank during transportation and connection to the energy storage system, providing a sealed and heat-insulated environment, enabling the liquid carbon dioxide storage tank to be directly used from the capture stage to the energy storage system, reducing the steps of repeated transfer of traditional liquid carbon dioxide and improving the utilization effect of the energy storage tank.

[0020] 2. The energy storage tank can be in an open state during the carbon dioxide capture stage, facilitating ventilation and observing the state of the tank body. After the carbon dioxide is stored, the energy storage tank is sealed. Through this sealed environment, the energy storage tank can be effectively insulated. During transportation, the low temperature state of carbon dioxide can be maintained through heat insulation, avoiding excessive pressure in the tank due to the increase in the temperature of the energy storage tank. When the energy storage tank is incorporated into the energy storage system, the sealed environment is conducive to the low-temperature management of the energy storage tank, making the low-temperature environment more conducive to the flow of carbon dioxide. 3. When the energy storage tank is in a closed state, it is also stabilized by external reinforcing ribs. When the liquid sloshing force during transportation and the flowing force of liquid carbon dioxide during energy storage are applied, they can be shared by the external reinforcing ribs. Moreover, when the energy storage tank is deformed, it can be sensed through the offset of the external reinforcing ribs, enabling maintenance personnel to judge the state of the energy storage tank through the liquid level change of the offset display column. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is an overall schematic diagram of a carbon dioxide energy storage device.

[0023] Figure 2 It is a side schematic diagram of a carbon dioxide energy storage device.

[0024] Figure 3 It is Figure 1 The enlarged view of part A in

[0025] Figure 4 It is a schematic diagram of the external reinforcing ribs of a carbon dioxide energy storage device.

[0026] Figure 5 It is a schematic diagram of the bent connecting rod of a carbon dioxide energy storage device.

[0027] Figure 6 It is a schematic diagram of the transmission frame of a carbon dioxide energy storage device.

[0028] Figure 7 It isFigure 2 Enlarged view of point B in .

[0029] Figure numerals: 1. energy storage tank; 11. connecting pipe; 111. sealing plate; 2. protective shell; 21. cover plate; 22. arc-shaped rack; 23. transmission gear; 24. vent; 25. shielding frame; 251. inclined block; 26. tooth plate; 27. hydraulic component; 3. matching block; 31. through channel; 32. sealing ring; 33. bent connecting rod; 34. sleeve; 35. touch-pressure seesaw; 4. external reinforcing rib; 41. sliding groove; 42. sliding rod; 43. steering plate; 44. transmission frame; 441. support rod; 442. lower inclined surface block; 45. offset display column; 451. piston member; 452. inclined convex edge; 453. marking line. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0034] Example 1 Reference Figures 1-7, which is the first embodiment of the present invention. This embodiment provides a carbon dioxide energy storage device, including an energy storage tank 1 and a connecting pipe 11, and further including a protective shell 2 covering the periphery of the energy storage tank 1. The opposite side walls on both sides of the protective shell 2 are movably connected by a pin shaft with a cover plate 21. An arc-shaped rack 22 is installed on the outer wall of the cover plate 21. A transmission gear 23 meshing with the arc-shaped rack 22 is installed on the top of the protective shell 2. Ventilation openings 24 for use during liquid storage are formed on the opposite side walls of the protective shell 2. A shielding frame 25 for relatively shielding and closing is installed on one side of the ventilation opening 24. A toothed plate 26 penetrating through the top side of the protective shell 2 is installed on the top side of the shielding frame 25, and the toothed plate 26 meshes with the transmission gear 23. A hydraulic component 27 is installed on the bottom side of the shielding frame 25. After the cover plate 21 and the shielding frame 25 move into place, the protective shell 2 can form a heat-insulating environment isolated from the outside; a matching block 3 is provided on the inner bottom wall of the protective shell 2, and a through-channel 31 for sealing the end of the connecting pipe 11 is installed on the outer wall of the cover plate 21.

[0035] Specifically, the shielding frame 25 fits on one side of the inner wall of the protective shell 2. The hydraulic component 27 drives the shielding frame 25 to block on one side of the ventilation opening 24. When the shielding frame 25 moves, the toothed plate 26, the transmission gear 23, and the arc-shaped rack 22 are jointly driven. At this time, the cover plate 21 also closes on the protective shell 2 accordingly. A sealing gasket is provided at the connection between the cover plate 21 and the protective shell 2. The hydraulic component 27 drives the shielding frame 25 to move. At this time, the shielding frame 25 gradually moves to one side of the ventilation opening 24. And when the shielding frame 25 moves, the cover plate 21 is synchronously driven to rotate through the meshing of the toothed plate 26, the transmission gear 23, and the arc-shaped rack 22, so that the cover plate 21 gradually covers the protective shell 2, making the protective shell 2 completely enclosed and covered.

[0036] Furthermore, a sealing ring 32 is placed on the inner wall of the through-channel 31. The outer ring of the sealing ring 32 is kept in contact with the inner wall of the through-channel 31. A sealing plate 111 is provided at the port of the connecting pipe 11. The inner ring diameter of the sealing ring 32 is slightly smaller than the outer ring diameter of the sealing plate 111, and the contact surface between the sealing ring 32 and the sealing plate 111 has a sealing soft pad. When the sealing ring 32 contacts the sealing plate 111, the through-channel 31 is partitioned into two areas by the sealing ring 32 and the sealing plate 111. At this time, the inside of the protective shell 2 is a sealed heat-insulating environment. When this energy storage device is transported to the energy storage system, the exposed end of the connecting pipe 11 outside can be directly connected to the original energy storage system, enabling the new energy storage device to form a sub-unit.

[0037] Furthermore, a sleeve 34 is installed on the outer wall of the cover plate 21. A bent connecting rod 33 is sleeved inside the sleeve 34. One end of the bent connecting rod 33 is connected to the end of the sealing ring 32. A touch lever 35 is installed on the other outer wall of the cover plate 21. One end of the touch lever 35 is connected to the other end of the bent connecting rod 33.

[0038] Furthermore, an external reinforcing rib 4 is provided outside the energy storage tank 1, and two groups of externally arranged mirror-image reinforcing ribs 4 are provided outside each group of energy storage tanks 1. Two groups of sliding grooves 41 are respectively installed on the inner top wall and the inner bottom wall of the protective shell 2. Each group of sliding grooves 41 slidably supports four sliding rods 42. Every two sliding rods 42 form a group to support one end of the external reinforcing rib 4, and the sliding rods 42 are connected to the end of the external reinforcing rib 4, playing a role in supporting and guiding the external reinforcing rib 4.

[0039] Furthermore, a steering plate 43 connected to the protective shell 2 is installed on one side of the connecting rod. The middle section of the steering plate 43 is movably connected to the inner wall of the protective shell 2 through a pin shaft. The top end of the steering plate 43 is connected to a sliding rod 42 through a movable rod body, and the bottom end of the steering plate 43 is connected to another sliding rod 42 through a movable rod body.

[0040] Furthermore, a transmission frame 44 is installed on the inner wall of the protective shell 2. A plurality of support rods 441 are installed through the transmission frame 44. One end of the support rod 441 is connected to the outer wall of the external reinforcing rib 4, and an inclined block 442 is installed at the end of the support rod 441 located inside the transmission frame 44.

[0041] Furthermore, an inclined block 251 is installed on the outer wall of the shielding frame 25. The inclined block 251 is located at the bottom side of the inclined block 442. When the shielding frame 25 moves upward, the inclined block 442 is also pressed to drive the external reinforcing rib 4 to move.

[0042] Furthermore, a deviation display column 45 is installed on the top of the transmission frame 44. A piston member 451 is movably arranged inside the deviation display column 45. The piston rod of the piston member 451 penetrates into the interior of the transmission frame 44. A colored liquid is filled between the piston member 451 and the deviation display column 45. An inclined convex edge 452 is installed on the top of the inclined block 442, and the inclined convex edge 452 is located at the bottom side of the piston member 451. A scale line 453 is provided on the outer surface of the deviation display column 45.

[0043] A usage method of a carbon dioxide energy storage device, which is applied to the carbon dioxide energy storage device. The usage method includes the following steps: S1. When in the carbon dioxide collection area, the produced carbon dioxide is liquefied and pressurized into the energy storage tank 1 through a compressor. During the pressurization process, the area around the energy storage tank 1 is kept ventilated to avoid high environmental carbon dioxide concentration caused by air leakage. S2. When preparing for transportation, the energy storage device changes from an open state to a closed state, which is beneficial to controlling the temperature of the energy storage device. When switching to the closed state, the internal energy storage tank 1 can be strengthened to improve the stability of liquid carbon dioxide transportation. When the energy storage device is transported to the original energy storage system, it can be directly incorporated, so that the energy storage system is composed of multiple such energy storage devices, which is more conducive to the management and maintenance of the energy storage system. At this time, the closed environment formed by the protective shell is more convenient for regulating the temperature of the energy storage tank 1, and the deformation of the outer shell of the energy storage tank 1 can be sensed by the offset display column 45, facilitating the inspection and maintenance by the staff; The interior of the protective shell 2 is a closed heat-insulating environment. When the energy storage device is transported to the energy storage system, the end of the connecting pipe 11 exposed outside can be directly connected to the original energy storage system, so that the new energy storage device forms a sub-unit.

[0044] Working principle: When carbon dioxide is captured at the carbon dioxide emission source, the carbon dioxide is directly converted into liquid state by the equipment at the capture site and pressurized into the energy storage tank 1. At this time, the protective shell 2 around the energy storage tank 1 is in an open state, ensuring that if the tank body of the energy storage tank 1 leaks, it can be directly dissipated, avoiding the accumulation of carbon dioxide and causing accidents. When the liquid carbon dioxide is filled into the energy storage tank 1, the state of the tank body of the energy storage tank 1 can be directly observed. When the two connected energy storage tanks 1 complete the carbon dioxide filling, at this time, the hydraulic component 27 drives the shielding frame 25 to move. At this time, the shielding frame 25 gradually moves to one side of the ventilation opening 24. And when the shielding frame 25 moves, through the meshing of the toothed plate 26, the transmission gear 23 and the arc-shaped rack 22, the cover plate 21 is synchronously driven to rotate, so that the cover plate 21 gradually covers the protective shell 2, making the protective shell 2 completely enclosed. When the rotating cover plate 21 is about to completely cover the protective shell 2, the through-channel 31 penetrates out of the connecting pipe 11, so that the end of the connecting pipe 11 is exposed on the other side of the cover plate 21. And at this time, the sealing ring 32 is located on one side of the sealing plate 111 of the connecting pipe 11. As the touch-pressure seesaw 35 contacts and is pressed by the cooperation block 3, the pressure point of the touch-pressure seesaw 35 drives the bent connecting rod 33 connected to the other end of the touch-pressure seesaw 35 to move. The movement of the bent connecting rod 33 drives the sealing ring 32 to move towards one side of the sealing plate 111 of the connecting pipe 11, so that when the cover plate 21 is completely covered, the sealing ring 32 also touches and seals on the sealing plate 111, thereby making the penetration part of the connecting pipe 11 also complete the sealing, making it convenient to control the low temperature of the energy storage tank 1 in the closed environment during the transportation process and subsequent connection to the energy storage system, so that the liquid carbon dioxide inside the energy storage tank 1 is more conducive to the flow of liquid carbon dioxide in the low temperature environment. And when the shielding frame 25 moves upward, the inclined block 251 of the shielding frame 25 gradually touches and presses the lower inclined surface block 442. The pressure on the lower inclined surface block 442 causes it to move, and the movement of the lower inclined surface block 442 drives the support rod 441 to move. The movement of the support rod 441 drives a group of outer reinforcing ribs 4 to move. The movement of a group of outer reinforcing ribs 4 drives a mirror-image group of outer reinforcing ribs 4 to move through the sliding rod 42 and the steering plate 43. The two groups of outer reinforcing ribs 4 move synchronously and clamp the middle section area of the energy storage tank 1. And under the reaction force, the shielding frame 25 is also pressed against the ventilation opening 24 by the applied pressure, making the ventilation opening 24 airtight. During the transportation process, the outer reinforcing ribs 4 improve the stability of the tank body during transportation. In the energy storage system, when the liquid carbon dioxide is repeatedly filled, the outer reinforcing ribs 4 support the middle section of the energy storage tank 1, sharing the flow force of the liquid carbon dioxide received by the middle section area of the energy storage tank 1, improving the service life of the energy storage tank 1 in the energy storage system. And when the outer reinforcing ribs 4 are fixed on the energy storage tank 1, the liquid level of the offset display column 45 can be recorded. If the energy storage tank 1 is deformed, its liquid level will also change accordingly, which is more conducive to the observation and maintenance of the maintenance personnel.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A carbon dioxide energy storage device, comprising an energy storage tank (1) and a connecting pipe (11), characterized in that: Also includes, A protective shell (2) covering the outer periphery of the energy storage tank (1), the opposite side walls of the protective shell (2) being movably connected to a cover plate (21) via a pin shaft, the outer wall of the cover plate (21) being mounted with an arc-shaped rack (22), the top of the protective shell (2) being mounted with a transmission tooth (23) meshing with the arc-shaped rack (22), the opposite side walls of the protective shell (2) being provided with a vent (24) for storing liquid, one side of the vent (24) being mounted with a corresponding shielding frame (25) for shielding and closing, the top side of the shielding frame (25) being mounted with a tooth plate (26) penetrating the top side of the protective shell (2), the tooth plate (26) being meshed with the transmission tooth (23), the bottom side of the shielding frame (25) being mounted with a hydraulic component (27), and the protective shell (2) forming a heat-insulating environment isolated from the outside world after the cover plate (21) and the shielding frame (25) are moved into place; The inner bottom wall of the protective shell (2) is provided with a matching block (3), and the outer wall of the cover plate (21) is provided with a through channel (31) for sealing the end of the connecting pipe (11).

2. The carbon dioxide energy storage device according to claim 1, wherein: The shielding frame (25) is attached to one side of the inner wall of the protective shell (2), and the shielding frame (25) is driven by the hydraulic component (27) to block one side of the vent (24). When the shielding frame (25) moves, the tooth plate (26), the transmission teeth (23) and the arc-shaped rack (22) are driven together, and the cover plate (21) is also closed on the protective shell (2). A sealing gasket is provided at the connection between the cover plate (21) and the protective shell (2).

3. The carbon dioxide energy storage device according to claim 2, wherein: A sealing ring (32) is placed on the inner wall of the through-channel (31), the outer ring of the sealing ring (32) is in close contact with the inner wall of the through-channel (31), a sealing plate (111) is provided at the end of the connecting pipe (11), and the inner ring diameter of the sealing ring (32) is slightly smaller than the outer ring diameter of the sealing plate (111).

4. The carbon dioxide energy storage device according to claim 3, wherein: The outer wall of the cover plate (21) is mounted with a sleeve (34), the inner wall of the sleeve (34) is sleeved with a bent connecting rod (33), one end of the bent connecting rod (33) is connected to the end of the sealing ring (32), and the other outer wall of the cover plate (21) is mounted with a touch-pressure rocker (35), one end of the touch-pressure rocker (35) is connected to the other end of the bent connecting rod (33).

5. The carbon dioxide energy storage device according to claim 4, wherein: The energy storage tank (1) is provided with external reinforcement ribs (4) on the outside, and each group of energy storage tanks (1) is provided with two groups of mirror-image external reinforcement ribs (4) on the outside, and the internal top wall and the internal bottom wall of the protective shell (2) are each installed with two groups of sliding grooves (41), and each group of sliding grooves (41) slidingly supports four groups of sliding rods (42), and each group of two sliding rods (42) supports one end of the external reinforcement rib (4), and the sliding rods (42) are connected to the ends of the external reinforcement ribs (4), so as to play a supporting and guiding role for the external reinforcement ribs (4).

6. The carbon dioxide energy storage device according to claim 5, characterized in that: On one side of the connecting rod, a steering plate (43) connected to the protective housing (2) is installed. The middle section of the steering plate (43) is movably connected to the inner wall of the protective housing (2) through a pin shaft. The top end of the steering plate (43) is connected to a group of sliding rods (42) through a movable rod body, and the bottom end of the steering plate (43) is connected to another group of sliding rods (42) through a movable rod body.

7. The carbon dioxide energy storage device according to claim 6, wherein: A transmission frame (44) is installed on the inner wall of the protective housing (2). A plurality of support rods (441) are installed through the transmission frame (44). One end of the support rod (441) is connected to the outer wall of the outer reinforcing rib (4). A lower inclined block (442) is installed at the end of the support rod (441) located inside the transmission frame (44).

8. The carbon dioxide energy storage device according to claim 7, wherein: An inclined block (251) is installed on the outer wall of the shielding frame (25). The inclined block (251) is located on the bottom side of the lower inclined block (442). When the shielding frame (25) moves upward, the lower inclined block (442) is also pressed to drive the outer reinforcing rib (4) to move.

9. The carbon dioxide energy storage device according to claim 8, wherein: An offset display column (45) is installed on the top of the transmission frame (44). A piston member (451) is movably arranged inside the offset display column (45). The piston rod of the piston member (451) penetrates into the inside of the transmission frame (44). A colored liquid is filled between the piston member (451) and the offset display column (45). An inclined convex edge (452) is installed on the top of the lower inclined block (442), and the inclined convex edge (452) is located on the bottom side of the piston member (451). A scale line (453) is provided on the outer surface of the offset display column (45).

10. A method for using a carbon dioxide energy storage device, applied to the carbon dioxide energy storage device described in claims 1-9 above, characterized in that, The usage method includes the following steps: S1. When in the carbon dioxide collection area, the produced carbon dioxide is liquefied and pressurized into the energy storage tank (1) by a compressor. During the pressurization process, the area around the energy storage tank (1) is kept ventilated to avoid high environmental carbon dioxide concentration caused by air leakage. S2. When preparing for transportation, the energy storage device changes from an open state to a closed state, which is beneficial for temperature control of the energy storage device. When switching to the closed state, the energy storage tank (1) inside is reinforced to improve the stability of liquid carbon dioxide transportation. S3. When the energy storage device is transported to the original energy storage system, it can be directly incorporated into the system, making the energy storage system composed of multiple such energy storage devices, which is more conducive to the management and maintenance of the energy storage system. At this time, the closed environment formed by the protective shell is more convenient for regulating the temperature of the energy storage tank (1), and the deformation of the outer shell of the energy storage tank (1) is sensed by the offset display column (45), which is convenient for the maintenance and repair of the staff.

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