Carbon capture device cavity structure and carbon capture method

Abstract

The invention discloses a carbon capture device cavity structure and a carbon capture method, and relates to the technical field of carbon capture, the carbon capture device cavity structure comprises two cylindrical cavities, the two cylindrical cavities are symmetrically arranged, the two cylindrical cavities are connected through a hose, a middle interlayer and an inner cylinder are arranged in each cylindrical cavity, the inner cylinder penetrates through the cylindrical cavity, and the inner cylinder is arranged in the middle interlayer. A diffusion interlayer is arranged at the bottom of the cylindrical cavity, a top cover is arranged on the lower portion of the diffusion interlayer, and the top cover is in threaded connection with the cylindrical cavity. According to the cavity structure of the carbon capture device and the carbon capture method, a double-cavity structure is adopted, alternate adsorption and desorption processes are achieved, continuous operation of a system is ensured, the device can keep gas flowing in the adsorption process through the dynamic switching design, meanwhile, desorption is conducted in the other cavity, the overall efficiency is effectively improved, and the carbon capture effect is improved. Compared with traditional single-cavity intermittent operation, the operation is greatly improved, and meanwhile the waste heat utilization efficiency is maximized.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and particularly to a cavity structure of a carbon capture device and a carbon capture method. Background Art

[0002] In currently common CO2 capture systems, the adsorption type is a widely used type. The core structure is a cylindrical stainless steel cavity, and a CO2 adsorption material is filled inside the cavity. And currently existing carbon capture devices are generally large in scale and are mostly applied to coal-fired power plants, oil fields, cement plants, etc. Such large-scale carbon capture systems can effectively reduce carbon emissions, but there has not been a large-scale application for carbon capture on small-scale vehicle mobile terminals.

[0003] The design concept of the double-cavity structure aims to optimize the performance and stability of the system by separating functional cavities. The double adsorption cavity or multiple adsorption cavities are generally used in combination with the adsorption method in the CO2 capture method. The main problems that the double-cavity design needs to face are that additional pipelines, valves and isolation devices need to be added, which will not only cause a significant reduction in the effective load of the whole vehicle, but also have a greater gas mass transfer resistance compared with the single cavity. In terms of economy, since the double-cavity system is more complex, its manufacturing cost is higher than that of the single cavity.

[0004] Currently, most of the operating carbon capture systems adopt an intermittent operation mode, that is, only adsorption or desorption can be carried out at the same time, resulting in significant efficiency loss and energy consumption problems. Taking the adsorption type system as an example, in the adsorption stage, gas flows into the cavity and the adsorbent captures CO2; while in the desorption stage, adsorption needs to be suspended, and CO2 is released by vacuum pumping or heating to the desorption temperature. This mode has many defects, mainly reflected in load fluctuation, efficiency loss and regeneration energy consumption. This kind of carbon capture system has low working efficiency and high energy consumption, which limits the further development of carbon capture technology and restricts the popularization and application of carbon capture technology. Summary of the Invention

[0005] The purpose of the present invention is to provide a cavity structure of a carbon capture device and a carbon capture method to solve the problems of complex double-cavity design and high energy consumption of carbon capture in the prior art.

[0006] To achieve the above object, the present invention provides a cavity structure of a carbon capture device, including two cylindrical cavities, the two cylindrical cavities are symmetrically arranged, the two cylindrical cavities are connected by a hose, an intermediate sandwich and an inner cylinder are arranged inside the cylindrical cavity, the inner cylinder penetrates through the cylindrical cavity, a diffusion sandwich is arranged at the bottom of the cylindrical cavity, a top cover is arranged below the diffusion sandwich, and the top cover is threadedly connected to the cylindrical cavity.

[0007] Preferably, the inner cylinder passes through the diffusion interlayer and the top cover. There is a void structure between the top cover and the diffusion interlayer. Circular holes are provided on the diffusion interlayer, and the circular holes are distributed in a circumferential array. The circular holes near the inner cylinder are sparsely distributed.

[0008] Preferably, the intermediate interlayer is filled with block adsorbents, and the outer wall of the intermediate interlayer is made of carbon fiber material.

[0009] Preferably, holes one, two, and three are provided in the upper part of the cylindrical cavity. Hole three and hole two are distributed on both sides of the inner cylinder. The inner cylinder communicates with hole two, and both hole one and hole three communicate with the intermediate interlayer.

[0010] Preferably, holes four and five are provided on the top cover. Hole five communicates with the inner cylinder, hole four communicates with the intermediate interlayer. A central pipe is connected to the outside of hole four and hole three. The central pipe is welded to hole four and hole three, and the other end of the central pipe is connected to the hose.

[0011] Preferably, both hole five and hole two are externally screwed with lead-out parts, and the other ends of the lead-out parts are connected to the exhaust pipe. Hole one is connected to the air guide pipe, and the air guide pipe is connected to the air extraction pump.

[0012] Preferably, hole two, hole three, hole four, and hole five have the same diameter, and the diameter of hole one is smaller than the diameter of hole two.

[0013] A carbon capture method includes the following steps:

[0014] S1. Adsorption stage and desorption stage;

[0015] S2. Cyclic operation; After a period of time, the state of the inlet valve changes. The valve of hole five in the left cavity is closed, and the valve of hole five in the right cavity is opened. The working states of the left and right cavities are swapped.

[0016] Preferably, the desorption process includes the following steps:

[0017] Step 1. The valve of hole five in the left cavity is opened, and the valve of hole five in the right cavity is closed. The tail gas enters the inner cylinder of the left cavity through the opened valve.

[0018] Step 2. Perform heat exchange with the adsorption material in the intermediate interlayer. The gas leaves the left cavity through hole two and flows into hole four of the right cavity through the hose.

[0019] Step 3. The gas diffuses through the diffusion interlayer and then enters the intermediate interlayer to complete the adsorption process.

[0020] Step 4: After the adsorption is completed, the gas is discharged to the environment through the third row of holes in the right cavity. At this time, the first hole is in a closed state.

[0021] Preferably, the desorption process includes the following steps:

[0022] Step 1: The third hole in the left cavity is closed, and the first hole is opened;

[0023] Step 2: The air pump extracts the adsorbed CO2 gas in the middle interlayer through the first hole;

[0024] Step 3: The gas is compressed and stored in the gas storage cylinder to realize the collection and storage of CO2.

[0025] Therefore, the present invention adopts the above-mentioned cavity structure of a carbon capture device and the carbon capture method, and has the following beneficial effects:

[0026] (1) The present invention adopts a double-cavity structure to realize alternating adsorption and desorption processes, ensuring the continuous operation of the system. This dynamic switching design enables the device to maintain gas flow during the adsorption process while performing desorption in another cavity, effectively improving the overall efficiency, with a significant improvement compared to traditional single-cavity intermittent operation, and maximizing the waste heat utilization efficiency.

[0027] (2) The present invention simplifies the structure and reduces the manufacturing cost. The device is simple, and the middle interlayer is directly filled with large block adsorbents, avoiding complex processing. The material and manufacturing costs are reduced by 25-30%. At the same time, the standardized components reduce the customization requirements, reducing the procurement and maintenance costs.

[0028] (3) The present invention has enhanced environmental adaptability and high stability at extreme temperatures. It uses a stainless steel inner cylinder to reduce the thermal expansion coefficient of the double cavity, reduce the deformation caused by thermal stress, and the cavity will be used together with the supporting outer shell to improve the integrity of the device. At the same time, the heat insulation performance is improved, so that the internal temperature of the device can also be maintained within the normal range under extreme working conditions, ensuring the activity of the adsorbent.

[0029] (4) The present invention is convenient for maintenance. The modular replacement design and the independently detachable connectors at the top of the adsorption cavity allow independent replacement of a single cavity, with shorter maintenance time.

[0030] (5) The carbon capture method of the present invention has high local efficiency in the adsorption stage, reduced energy consumption in the desorption stage, and high continuity of cyclic operation. The dynamic flipping ensures uninterrupted operation.

[0031] The following further describes the technical solutions of the present invention in detail through the drawings and embodiments. Description of the Drawings

[0032] Figure 1It is a schematic structural diagram of a cavity structure of a carbon capture device according to the present invention;

[0033] Figure 2 It is a schematic structural diagram of a cylindrical cavity structure according to the present invention;

[0034] Figure 3 It is a cross-sectional view of a cylindrical cavity according to the present invention;

[0035] Figure 4 It is a schematic structural diagram of a diffusion sandwich structure according to the present invention;

[0036] Figure 5 It is a top view of a cylindrical cavity according to the present invention;

[0037] Figure 6 It is a bottom view of a cylindrical cavity according to the present invention;

[0038] Figure 7 It is a thermal simulation diagram according to the present invention;

[0039] Figure 8 It is a gas flow simulation diagram according to the present invention;

[0040] Reference numerals

[0041] 1. Cylindrical cavity; 2. Hose; 3. Intermediate sandwich; 4. Inner cylinder; 5. Diffusion sandwich; 6. Top cover; 7. Circular hole; 8. Hole 1; 9. Hole 2; 10. Hole 3; 11. Hole 4; 12. Hole 5; 13. Central tube; 14. Lead-out part. Detailed implementation manners

[0042] The technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0043] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0044] Embodiment

[0045] Please refer to Figure 1-8, the present invention provides a cavity structure of a carbon capture device and a carbon capture method, including two cylindrical cavities 1. The two cylindrical cavities 1 are mirror-symmetrical, making the airway structure more symmetrical and saving space. Since the rate of change of the time required for adsorbing CO2 and desorbing CO2 is different as the volume of the device increases, in order to minimize the space occupied by the device and the load, and to make the two devices work alternately reasonably, the cross-sectional diameter of each cylindrical cavity 1 is 352 mm, the barrel length is 597 mm, and the overall volume is about 0.058 m 3 , the single-cavity adsorbent filling volume is about 0.05 m 3 , the volume of CO2 adsorbed at one time is 0.01 m 3 , the time required for the adsorbent to be completely adsorbed and the desorption time are both about 67 min.

[0046] The two cylindrical cavities 1 are connected by a hose 2. An intermediate sandwich 3 and an inner cylinder 4 are arranged in the cylindrical cavity 1. The intermediate sandwich 3 and the inner cylinder 4 are not connected to each other. The inner cylinder 4 is the tail gas flow channel and is made of stainless steel material for heat transfer. The diameter of the inner cylinder 4 in the cavity is 80 mm, which runs through the entire cylindrical cavity 1. A diffusion sandwich 5 is arranged at the bottom of the cylindrical cavity 1. A top cover 6 is arranged below the diffusion sandwich 5. The inner cylinder 4 passes through the diffusion sandwich 5 and the top cover 6. There is no space structure between the top cover 6 and the diffusion sandwich 5, and no CO2 adsorbent is filled. The function of this space is to reduce the exhaust back pressure, lower the gas flow rate, and is conducive to the diffusion of the gas after passing through the holes, and then fully contact with the adsorbent in the intermediate sandwich 3. Reduce the pollution of the adsorbent by the particulate matter generated by the gas flow turbulence and extend the service life of the adsorbent.

[0047] Circular holes 7 are arranged on the diffusion sandwich 5. The circular holes 7 are arranged in a circumferential array. The holes near the inner cylinder 4 are arranged relatively sparsely. As the radius increases, the hole density gradually increases. Such a design helps the gas to diffuse evenly into the intermediate sandwich 3, reduces local overloading adsorption, fully contacts with the adsorbent therein, and can contact more with the adsorbent at a lower temperature outside the cylindrical cavity 1, improving the adsorption efficiency. The hole density increases with the increase of the radius, which can make the gas flow velocity distribution more uniform and reduce the gas flow resistance and pressure drop.

[0048] The top cover 6 is connected to the cylindrical cavity 1 by threads. The top cover 6 is detachable. The cross-sectional diameter of the top cover 6 is slightly larger than the diameter of the cylindrical cavity 1. There is a 3-cm-long thread on the inner side of the cylindrical part. At the same position on the outer wall of the cylindrical cavity 1, there is also a 3-cm-long thread. The two parts can be connected by threads, which is not only airtight but also convenient for disassembly, can clean the adsorbent debris, and prevent the device from being blocked.

[0049] The intermediate sandwich layer 3 is filled with a block-shaped adsorbent for absorbing CO2. There is no other special structure in the design, aiming to improve the adsorbent filling rate and reduce the processing cost. The outer wall uses lightweight carbon fiber material, which has a good heat insulation effect and reduces the weight of the device. Carbon aerogel is filled in the intermediate sandwich layer 3. Its pore diffusion structure extends the gas diffusion path and increases the contact time, resulting in a significant improvement in the adsorption efficiency compared to the traditional single-chamber design.

[0050] At the top of the cylindrical cavity 1, there are hole one 8, hole two 9, and hole three 10. Hole three 10 and hole two 9 are distributed on both sides of the inner cylinder 4 to extend the air flow channel as much as possible and ensure sufficient contact between the adsorbent and CO2. The inner cylinder 4 is connected to hole two 9 to achieve the connection between the inner cylinder and the external space. Hole one 8 and hole three 10 are both connected to the intermediate sandwich layer 3. Hole three 10 is used to connect the intermediate sandwich layer part to the external environment. Its diameter is 80 mm, and its function is to serve as an exhaust port for unabsorbed gases such as nitrogen, and it is equipped with a valve to control the gas emission. The periodic switching of the state of the cavity intake valve is automatically managed by the electronic control module, reducing the need for manual intervention. The system can achieve seamless switching, and the transition time between the adsorption stage and the desorption stage is shortened to within 10 seconds. The diameter of hole one 8 is relatively small, about 15 mm, and it is also used to communicate the intermediate sandwich layer 3 with the external environment, mainly for extracting CO2 gas during the desorption process.

[0051] On the top cover 6, there are hole four 11 and hole five 12. Hole four 11 serves as the intake port with a diameter of 80 mm, which connects the inner cylinder 4 to the external environment, enabling the air flow to directly enter the inner cylinder 4. Hole five 12 is used to connect the outer side of the cavity to the intermediate sandwich layer 3, and its radius is 80 mm. A central tube 13 extends outward from hole four 11 to the outside of the cylindrical cavity 1. The central tube 13 with an inner diameter of 80 mm, an outer diameter of 82 mm, and a length of 50 mm is connected to hole four 11 in a butt-welded manner. The central tube 13 is mainly used to connect the flexible hose 2 to facilitate the transmission of gas between different cavities. Thread fixing is adopted, combined with welding assistance, to ensure the sealing performance and anti-vibration performance.

[0052] Two cylindrical cavities 1 are placed side by side. A 5-cm threaded structure is designed on the inner cylinder wall at hole five 12, which is used to connect the lead-out part 14. The lead-out part 14 is cylindrical and has a through hole inside. The outer diameter of its cross-section is slightly smaller than 80 mm, and there is a 5-cm threaded structure on the outside of one side. The lead-out part 14 is connected to the cavity hole five 12 by a threaded connection. The other side of the lead-out part 14 has no threaded structure and is directly connected to the exhaust pipe. The exhaust pipes led out from hole five 12 of the two cavities are closed by valves and finally converge into one pipe and are connected to the exhaust pipe of a heavy truck. Such a design can effectively introduce the tail gas into the device.

[0053] The hole two 9 at the top of the left cavity is connected to the hose 2 through the lead-out part 14, and the hose 2 is finally connected to the hole four 11 at the bottom of the right cavity. Similarly, the hole two 9 at the top of the right cavity is connected to the hose 2 through the lead-out part 14, and the hose 2 is finally connected to the hole four 11 of the left cavity. Such a connection method enables the gas to circulate between the two cavities, realizing the alternation of the adsorption and desorption processes. In addition, the hole one 8 of both devices is connected to a special gas pipe, and these gas pipes are connected to an air extraction pump for extracting the CO2 gas in the intermediate layer during the desorption stage.

[0054] A carbon capture method includes an adsorption stage, a desorption stage, and cyclic operation.

[0055] Adsorption stage: During the operation of the device, first assume that the valve of the hole four 11 in the left cavity is in the open state, while the valve of the hole four 11 in the right cavity is closed. At this time, the exhaust gas discharged from the heavy truck passes through the exhaust pipe and then enters the inner cylinder 4 of the left cavity through the open valve. The temperature of these high-temperature gases is usually between 300°C and 500°C. When they flow in the inner cylinder 4, they will exchange heat with the adsorption material in the intermediate layer 3 through direct heat transfer, thereby gradually reducing the gas temperature. After passing through the inner cylinder 4, the gas will leave the left cavity from the hole two 9 and then flow into the bottom hole four 11 of the right cavity through the connected hose 2. During this process, the temperature of the gas will gradually drop to the ambient temperature. Subsequently, the gas enters the special sandwich structure of the right cavity, where the gas diffuses through the array of holes on the diffusion sandwich 5 and then enters the intermediate layer 3, contacts the adsorbent filled therein, and then undergoes the adsorption process to effectively capture CO2. After the adsorption process is completed, the gas is discharged from the hole three 10 of the right cavity to the environment, and at this time the hole one 8 is in the closed state to ensure the smooth progress of the adsorption process.

[0056] Waste heat utilization realizes temperature-controlled adsorption. When the exhaust gas enters the inner cylinder, the high-temperature waste heat is transferred to the adsorption cavity wall to store heat for subsequent desorption. At the same time, through the heat dissipation of the inner cylinder, the gas temperature drops from 400°C to the ambient temperature, reducing the thermal shock to the adsorbent and avoiding the burning of active sites due to high temperature. The array of holes optimizes gas diffusion, and the gradually denser pore size design in the intermediate layer forms a diffuser effect, reducing the gas flow rate and increasing the contact area when the gas diffuses from the center to the periphery.

[0057] Desorption stage: Meanwhile, the left chamber undergoes the desorption process. During the desorption stage, hole three 10 of the left chamber is closed, while hole one 8 is opened. The air pump extracts the adsorbed CO2 gas in the intermediate sandwich layer 3 through hole one 8, and after compressing these gases through a compressor, stores them in the gas storage cylinder, achieving the collection and storage of CO2. During this process, the adsorption material in the left chamber absorbs the waste heat of the exhaust gas during the adsorption process. This heat helps with the desorption process, improves the desorption efficiency, and reduces energy consumption.

[0058] Desorption is driven by waste heat. When desorbing, hole three 10 is closed, and only hole one 8 is pumped by the pump. Utilizing the heat accumulated in the chamber during the previous adsorption stage, no additional heating equipment is required, reducing energy consumption. For the efficient recovery of directional gas extraction, the directional air extraction design of hole one 8 ensures that the desorbed gas is concentratedly extracted, avoiding the deposition of residual gas in the sandwich layer.

[0059] Cyclic operation: After a period of time, the state of the valve of hole four 11 changes, that is, the valve of hole four 11 in the left chamber is closed, and the valve of hole four 11 in the right chamber is opened. At this time, the working states of the left and right chambers are completely swapped. The gas first enters the right chamber, and after heat transfer helps with the desorption process, it then enters the intermediate sandwich layer 3 of the left chamber, enabling the adsorbent in the left chamber to adsorb CO2. After some time, the valve state changes again, and so on in a cycle, thereby realizing the continuous progress of the carbon adsorption work, effectively reducing the CO2 emissions in the exhaust gas of heavy trucks, and making contributions to environmental protection and energy conservation and emission reduction. The double-chamber design optimizes the flow channel and functional partition, and the total mass is smaller than that of traditional similar devices, reducing the load of the truck and improving the transportation efficiency.

[0060] Therefore, the present invention adopts the above-mentioned cavity structure of a carbon capture device and a carbon capture method. The present invention adopts a double-chamber structure to realize alternating adsorption and desorption processes, ensuring the continuous operation of the system. This dynamic switching design enables the device to maintain gas flow during the adsorption process, while desorption is carried out in another chamber, effectively improving the overall efficiency, which has a significant improvement compared to the traditional single-chamber intermittent operation, and at the same time maximizing the waste heat utilization efficiency. The present invention simplifies the structure and reduces the manufacturing cost. The device is simple, and the intermediate sandwich layer is directly filled with large block adsorbents, avoiding complex processing. The material and manufacturing costs are reduced by 25 - 30%. At the same time, the standardized components reduce the customization requirements, reducing the procurement and maintenance costs. The carbon capture method of the present invention has high local efficiency in the adsorption stage, reduced energy consumption in the desorption stage, and high continuity in cyclic operation. The dynamic flip ensures uninterrupted operation.

[0061] Finally, 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 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 they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A cavity structure of a carbon capture device, characterized in that: It includes two cylindrical cavities which are symmetrically arranged. The two cylindrical cavities are connected by a hose. An intermediate sandwich layer and an inner cylinder are arranged in the cylindrical cavity. The inner cylinder penetrates through the cylindrical cavity. A diffusion sandwich layer is arranged at the bottom of the cylindrical cavity. A top cover is arranged at the lower part of the diffusion sandwich layer. The top cover is threadedly connected to the cylindrical cavity.

2. The cavity structure of a carbon capture device according to claim 1, wherein: The inner cylinder passes through the diffusion sandwich layer and the top cover. There is a non-space structure between the top cover and the diffusion sandwich layer. Circular holes are arranged on the diffusion sandwich layer. The circular holes are distributed in a circumferential array. The circular holes near the inner cylinder are sparsely distributed.

3. The cavity structure of a carbon capture device according to claim 2, characterized in that: The intermediate sandwich layer is filled with block adsorbents. The outer wall of the intermediate sandwich layer is made of carbon fiber material.

4. A cavity structure of a carbon capture device according to claim 3, characterized in that: Holes 1, 2 and 3 are arranged at the upper part of the cylindrical cavity. Holes 3 and 2 are distributed on both sides of the inner cylinder. The inner cylinder communicates with hole 2. Holes 1 and 3 both communicate with the intermediate sandwich layer.

5. The cavity structure of a carbon capture device according to claim 4, characterized in that: Holes 4 and 5 are arranged on the top cover. Hole 5 communicates with the inner cylinder. Hole 4 communicates with the intermediate sandwich layer. A central pipe is connected to the outside of holes 4 and 3. The central pipe is welded to holes 4 and 3. The other end of the central pipe is connected to the hose.

6. The cavity structure of a carbon capture device according to claim 5, wherein: Threaded connectors are externally connected to both holes 5 and 2. The other ends of the threaded connectors are connected to an exhaust pipe. Hole 1 is connected to a gas guide pipe. The gas guide pipe is connected to an air extraction pump.

7. The cavity structure of a carbon capture device according to claim 6, wherein: Holes 2, 3, 4 and 5 have the same diameter. The diameter of hole 1 is smaller than that of hole 2.

8. A carbon capture method, applying the cavity structure of a carbon capture device according to any one of the above claims 1-7, characterized in that, It includes the following steps: S1. Adsorption stage and desorption stage; S2. Cyclic operation; After a period of time, the state of the inlet valve changes. The valve of hole 5 in the left cavity is closed, and the valve of hole 5 in the right cavity is opened. The working states of the left and right cavities are swapped.

9. A carbon capture method according to claim 8, characterized in that, The desorption process includes the following steps: Step 1. The valve of hole 5 in the left cavity is opened, and the valve of hole 5 in the right cavity is closed. The tail gas enters the inner cylinder of the left cavity through the opened valve. Step 2. It exchanges heat with the adsorption material in the intermediate sandwich layer. The gas leaves the left cavity through hole 2 and flows into hole 4 in the right cavity through the hose. Step 3. The gas diffuses through the diffusion sandwich layer and then enters the intermediate sandwich layer to complete the adsorption process. Step 4. After the adsorption is completed, the gas is discharged from hole 3 in the right cavity to the environment. At this time, hole 1 is in the closed state.

10. A carbon capture method according to claim 9, characterized in that, The desorption process includes the following steps: Step 1. Hole 3 in the left cavity is closed, and hole 1 is opened. Step 2. The air extraction pump extracts the adsorbed CO2 gas in the intermediate sandwich layer through hole 1. Step 3. The gas is compressed and stored in a gas storage cylinder to realize the collection and storage of CO2.

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