A carbon dioxide sequestration device

Abstract

The utility model relates to carbon dioxide desorption, specifically disclose a kind of carbon dioxide storage device, including desorption tank, the heat preservation ring of being sleeved in the outer wall of desorption tank, be located in the liquid inlet device of desorption tank upper end, heating device is located in the inner bottom of desorption tank, with the pressurizing device being communicated with desorption tank, and with the gas storage tank being connected with pressurizing device;The upper and lower ends of heat preservation ring are all sealedly connected with the outer wall of desorption tank, annular liquid guide cavity is equipped between heat preservation ring and the outer wall of desorption tank, the lower end of liquid guide cavity is connected with the lower end of desorption tank by first conduit, and the upper end of liquid guide cavity is connected with second conduit, and pump body is equipped on first conduit.The carbon dioxide storage device of the utility model can efficiently desorb liquid absorbed carbon dioxide and store compressed carbon dioxide.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon dioxide desorption, and more specifically, to a carbon dioxide storage device. Background Technology

[0002] In the field of carbon dioxide sequestration technology, there are currently three main methods. The first is geological sequestration, which achieves long-term sequestration by injecting carbon dioxide into deep underground rock formations or depleted oil and gas fields; the second is marine sequestration, which uses deep-sea pressure to dissolve or store carbon dioxide on the seabed; and the third is temporary sequestration in high-pressure tanks, which is widely used in industrial recycling systems due to its flexibility in releasing and utilizing carbon dioxide at any time.

[0003] Temporary storage, to improve efficiency, typically employs high-pressure storage. A typical process involves: first, allowing the absorbent to fully absorb carbon dioxide; then, separating the gas through desorption; and finally, compressing and storing it in a high-pressure container. However, this process has significant drawbacks: the desorption stage requires continuous heating of the absorbent, consuming substantial energy; the gas compression stage is also energy-intensive, creating a "double energy consumption" problem. More importantly, the rate of carbon dioxide release from the liquid is difficult to control precisely, easily fluctuating and preventing the entire system from achieving continuous and stable operation, severely hindering efficiency improvements in industrial applications. Therefore, it is necessary to develop a temporary storage device that can reduce energy consumption, achieve precise control of the desorption process, and operate continuously. Utility Model Content

[0004] The purpose of this invention is to provide a carbon dioxide storage device that can efficiently desorb liquids that have absorbed carbon dioxide and compress and store the carbon dioxide.

[0005] This utility model is achieved through the following technical solution: The carbon dioxide storage device of this utility model includes a desorption tank, a heat-insulating ring sleeved on the outer wall of the desorption tank, a liquid inlet device located at the upper end of the desorption tank, a heating device located at the bottom of the desorption tank, a pressurizing device connected to the desorption tank, and a gas storage tank connected to the pressurizing device; both the upper and lower ends of the heat-insulating ring are sealed to the outer wall of the desorption tank, and an annular liquid guiding cavity is provided between the heat-insulating ring and the outer wall of the desorption tank. The lower end of the liquid guiding cavity is connected to the lower end of the desorption tank through a first conduit, and the upper end of the liquid guiding cavity is connected to a second conduit. A pump body is provided on the first conduit.

[0006] Furthermore, the liquid inlet device includes an annular and hollow liquid inlet plate disposed at the upper end of the desorption tank, a plurality of liquid inlet holes opened on the lower side of the liquid inlet plate, and a liquid inlet pipe connected to the upper side of the liquid inlet plate; the outer wall of the liquid inlet plate is attached to the inner wall of the desorption tank.

[0007] Furthermore, the inner wall of the desorption tank is provided with multiple guide rings, which are fixedly connected to the inner wall of the desorption tank. Multiple liquid guiding holes are opened on the guide rings. The height of the inner wall of the guide ring is higher than the height of the outer wall, and the multiple guide rings are evenly distributed in the vertical direction.

[0008] Furthermore, the upper end of the desorption tank is provided with an annular sealing ring, and there is a gap between the sealing ring and the inner wall of the desorption tank; the liquid inlet plate is clamped between the sealing ring and the desorption tank, and the upper end of the sealing ring is provided with an exhaust hood, which is connected to the pressurization device through an exhaust pipe.

[0009] Furthermore, the pressurizing device includes a compressor connected to the exhaust pipe; the outlet of the compressor is connected to the air storage tank; and a first valve is provided at the connection between the exhaust pipe and the air inlet of the compressor.

[0010] Furthermore, a spiral heat exchange tube is provided between the sealing ring and the desorption tank. Both ends of the heat exchange tube pass through the side wall of the desorption tank and extend outward. One end of the heat exchange tube is connected to the outlet of the compressor, and the other end is connected to the gas storage tank. A second valve is provided at the connection between the heat exchange tube and the outlet of the compressor, and a third valve is provided at the other end of the heat exchange tube. The heat exchange tube is located below the liquid inlet plate, and gaps are provided between the heat exchange tube and the outer wall of the sealing ring and the inner wall of the desorption tank.

[0011] Furthermore, the exhaust pipe is equipped with a drying tank, and the drying tank contains a molecular sieve.

[0012] Furthermore, a buffer tank is provided between the heat exchange tube and the gas storage tank, and a pressure valve is provided between the buffer tank and the gas storage tank.

[0013] Furthermore, the buffer tank and the drying tank are connected at the end near the compressor via a backflush pipe, and a fourth valve is provided on the backflush pipe.

[0014] Furthermore, the heating device includes an electric heating plate disposed at the bottom of the desorption container.

[0015] The technical solution of this utility model has at least the following advantages and beneficial effects: In use, the carbon dioxide sealing device of this utility model delivers a carbon dioxide-rich stock solution (referred to as rich solution) into the desorption tank through an inlet device. The rich solution slowly flows down the inner wall of the desorption tank. The rich solution at the bottom of the desorption tank is heated by a heating device, causing the carbon dioxide in the rich solution to rapidly precipitate out, turning the rich solution into a lean solution, which then enters a pressurizing device. The pressurizing device pressurizes the carbon dioxide and sends it to a storage tank for storage (it can be discharged from the storage tank for use when needed). The liquid flowing to the bottom of the desorption tank enters the first conduit and, under the action of the pump, enters the insulation ring and desorbs... The liquid is drawn into the liquid guiding chamber between the tanks and then discharged from the second conduit at the upper end of the liquid guiding chamber. During this process, since the lean liquid discharged from the bottom of the desorption tank is still at a high temperature, it can be sent into the liquid guiding chamber and exchanged with the rich liquid on the side wall and inner wall of the desorption tank to heat the rich liquid. This allows most of the carbon dioxide to be released as the rich liquid flows along the side wall of the desorption tank. At this point, the power of the heating device can be reduced. The heat can be effectively utilized throughout the process, and the rich liquid can continuously enter and the lean liquid can continuously exit. The desorption process can be started or interrupted according to the demand for carbon dioxide, and the desorption rate can also be increased or decreased. Attached Figure Description

[0016] Figure 1 A schematic diagram of the carbon dioxide storage device provided in an embodiment of this utility model from one perspective;

[0017] Figure 2 A two-view structural schematic diagram of the carbon dioxide storage device provided in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the heating device provided in an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the desorption tank provided in an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of the liquid inlet device provided in an embodiment of this utility model from one perspective;

[0021] Figure 6 A two-view structural schematic diagram of the liquid inlet device provided in an embodiment of this utility model;

[0022] Figure 7 This is a schematic diagram of the flow guide ring portion provided in an embodiment of the present utility model.

[0023] Icons: 10-Desorption tank, 11-Insulation ring, 12-Heating plate, 13-Liquid guiding chamber, 14-First conduit, 15-Pump body, 16-Second conduit, 17-Guide ring, 18-Guide hole, 19-Sealing ring, 110-Exhaust hood, 111-Exhaust pipe, 112-Drying tank, 113-First valve, 20-Liquid inlet device, 21-Liquid inlet plate, 22-Liquid inlet hole, 23-Liquid inlet pipe, 30-Pressure device, 31-Compressor, 32-Heat exchange tube, 33-Second valve, 34-Third valve, 35-Buffer tank, 36-Pressure valve, 37-Backflush pipe, 38-Fourth valve, 40-Gas storage tank. Detailed Implementation

[0024] Example

[0025] The following description, in conjunction with specific embodiments, further illustrates the point, as shown in the appendix. Figure 1 - Appendix Figure 7 As shown, the carbon dioxide storage device of this embodiment includes a desorption tank 10, a heat-insulating ring 11 sleeved on the outer wall of the desorption tank 10, a liquid inlet device 20 located at the upper end of the desorption tank 10, a heating device located at the bottom of the desorption tank 10, a pressurizing device 30 connected to the desorption tank 10, and a gas storage tank 40 connected to the pressurizing device 30. The upper and lower ends of the heat-insulating ring 11 are sealed to the outer wall of the desorption tank 10. An annular liquid guiding cavity 13 is provided between the heat-insulating ring 11 and the outer wall of the desorption tank 10. The lower end of the liquid guiding cavity 13 is connected to the lower end of the desorption tank 10 through a first conduit 14. The upper end of the liquid guiding cavity 13 is connected to a second conduit 16. A pump body 15 is provided on the first conduit 14. Specifically, during use, the carbon dioxide-rich stock solution is fed into the desorption tank 10 through the inlet device 20, causing the rich solution to slowly flow down the inner wall of the desorption tank 10. The rich solution at the bottom of the desorption tank 10 is heated by the heating device, at which point the carbon dioxide in the rich solution is rapidly released, turning the rich solution into a lean solution, which then enters the pressurization device 30. The pressurization device 30 pressurizes the carbon dioxide and sends it into the gas storage tank 40 for storage (it can be discharged through the gas storage tank 40 when needed). The liquid flowing to the bottom of the desorption tank 10 enters the first conduit 14, and under the action of the pump body 15, it enters the liquid guiding chamber 13 between the insulation ring 11 and the desorption tank 10, and then flows out from the conduit... The second conduit 16 at the upper end of the liquid chamber 13 is discharged. During this process, since the lean liquid discharged from the bottom of the desorption tank 10 is still at a high temperature, it can be sent into the liquid guiding chamber 13 and exchange heat with the rich liquid on the inner wall of the desorption tank 10 through the side wall of the desorption tank 10, thereby heating the rich liquid. This allows most of the carbon dioxide to be released during the flow of the rich liquid on the side wall of the desorption tank 10. At this time, the power of the heating device can be reduced. Heat can be effectively utilized throughout the process, and the rich liquid can be continuously introduced and the lean liquid can be continuously discharged. The desorption process can be started or interrupted according to the demand for carbon dioxide, and the desorption rate can be increased or decreased.

[0026] The liquid inlet device 20 in this embodiment includes an annular and hollow liquid inlet plate 21 disposed at the upper end of the desorption tank 10, a plurality of liquid inlet holes 22 opened on the lower side of the liquid inlet plate 21, and a liquid inlet pipe 23 connected to the upper side of the liquid inlet plate 21; the outer wall of the liquid inlet plate 21 is attached to the inner wall of the desorption tank 10. Specifically, through the liquid inlet plate 21 and the densely distributed liquid inlet holes 22, the rich liquid can be evenly attached to the inner wall of the desorption tank 10 and flow downward, and the liquid inlet pipe 23 is connected to a liquid delivery pump, which delivers the rich liquid into the desorption tank 10 by pressure, avoiding gas backflow.

[0027] In this embodiment, the inner wall of the desorption tank 10 is provided with multiple guide rings 17, which are fixedly connected to the inner wall of the desorption tank 10. Multiple liquid guiding holes are opened on the guide rings 17. The height of the inner wall of the guide rings 17 is higher than the height of the outer wall, and the multiple guide rings 17 are evenly distributed vertically. Specifically, the guide rings 17 are in full contact with the inner wall of the desorption tank 10, which can better transfer the heat in the liquid guiding chamber 13 to the guide rings 17, thereby heating the rich liquid on the guide rings 17 and causing the carbon dioxide to precipitate rapidly and completely.

[0028] In this embodiment, the upper end of the desorption tank 10 is provided with an annular sealing ring 19, and a gap is provided between the sealing ring 19 and the inner wall of the desorption tank 10. The liquid inlet plate 21 is engaged between the sealing ring 19 and the desorption tank 10. The upper end of the sealing ring 19 is provided with an exhaust hood 110, which is connected to the pressurizing device 30 through an exhaust pipe 111. Specifically, the upper end of the desorption tank 10 can be sealed by the sealing ring 19 and the exhaust hood 110. The carbon dioxide generated in the desorption tank 10 enters the pressurizing device 30 for pressurization through the exhaust hood 110 and the exhaust pipe 111.

[0029] The pressurizing device 30 in this embodiment includes a compressor 31 connected to an exhaust pipe 111; the outlet of the compressor 31 is connected to a gas storage tank 40; a first valve 113 is provided at the connection between the exhaust pipe 111 and the inlet of the compressor 31. Specifically, the compressor 31 draws in carbon dioxide from the exhaust pipe 111, compresses it to high pressure, and then sends it into the gas storage tank 40 for storage.

[0030] In this embodiment, a spiral heat exchange tube 32 is provided between the sealing ring 19 and the desorption tank 10. Both ends of the heat exchange tube 32 pass through the side wall of the desorption tank 10 and extend outward. One end of the heat exchange tube 32 is connected to the outlet of the compressor 31, and the other end is connected to the gas storage tank 40. A second valve 33 is provided at the connection between the heat exchange tube 32 and the outlet of the compressor 31, and a third valve 34 is provided at the other end of the heat exchange tube 32. The heat exchange tube 32 is located below the liquid inlet plate 21, and there are gaps between the heat exchange tube 32 and the outer wall of the sealing ring 19 and the inner wall of the desorption tank 10. Specifically, after the compressor 31 compresses the carbon dioxide discharged from the exhaust pipe 111 into high pressure, the temperature of the gas increases significantly. At this time, the high-temperature carbon dioxide can be sent into the heat exchange tube 32. The rich liquid discharged from the drain plate comes into contact with the high-temperature heat exchange tube 32, so that the rich liquid and the high-temperature carbon dioxide complete the heat exchange operation. The temperature of the rich liquid rises, and the carbon dioxide inside can be discharged fully and quickly. At this time, the temperature of the high-pressure carbon dioxide decreases, and it can be better sent into the gas storage tank 40 for storage. This can reduce the steps of cooling the compressed gas or the cost required for cooling.

[0031] In this embodiment, the exhaust pipe 111 is equipped with a drying tank 112, which contains a molecular sieve. Specifically, the drying tank 112 and the molecular sieve can dry the carbon dioxide gas entering the exhaust pipe 111, leaving the moisture behind and preventing a large amount of liquid from entering subsequent equipment and pipelines.

[0032] In this embodiment, a buffer tank 35 is also provided between the heat exchange tube 32 and the gas storage tank 40, and a pressure valve 36 is provided between the buffer tank 35 and the gas storage tank 40. Specifically, the compressor 31 may experience unstable gas pressure during the compression process. Therefore, the compressed gas is first sent to the buffer tank 35 for buffering, and then enters the gas storage tank 40 through the pressure valve 36. The pressure valve 36 can only be opened when the pressure is higher than a certain level, thus effectively preventing gas backflow.

[0033] In this embodiment, the buffer tank 35 and the drying tank 112 near the compressor 31 are connected by a backflush pipe 37, which is equipped with a fourth valve 38. Specifically, the molecular sieve in the drying tank 112 can be backflushed and activated through the backflush pipe 37. During operation, the liquid inlet device 20 needs to be closed first (to stop cooling the high-pressure carbon dioxide), and then the other valves 113, 33, and 34 need to be closed. At this time, since the high-pressure carbon dioxide gas has not been cooled, the high-pressure carbon dioxide gas in the buffer tank 35 is at a high temperature. Then, the fourth valve 38 is opened, and part of the high-temperature, high-pressure carbon dioxide gas stored in the buffer tank 35 is sent into the drying tank 112 through the backflush pipe 37 to perform high-temperature backflushing on the molecular sieve in the drying tank 112. This can avoid or reduce the frequency of molecular sieve replacement.

[0034] The heating device in this embodiment includes an electric heating plate 12 located at the bottom of the desorption tank 10.

[0035] In summary, the carbon dioxide sequestration device of this embodiment, during use, introduces a carbon dioxide-rich stock solution (referred to as rich solution) into the desorption tank 10 through the inlet device 20. The rich solution slowly flows down the inner wall of the desorption tank 10. The rich solution at the bottom of the desorption tank 10 is heated by the heating device, causing the carbon dioxide in the rich solution to rapidly precipitate out, turning the rich solution into a lean solution, which then enters the pressurization device 30. The pressurization device 30 pressurizes the carbon dioxide and sends it to the storage tank 40 for storage (it can be discharged from the storage tank 40 for use when needed). The liquid flowing to the bottom of the desorption tank 10 enters the first conduit 14 and, under the action of the pump body 15, enters the liquid guide between the insulation ring 11 and the desorption tank 10. The solution is placed in chamber 13 and then discharged from the second conduit 16 at the upper end of the liquid guiding chamber 13. During this process, since the lean solution discharged from the bottom of the desorption tank 10 is still at a high temperature, it can be sent into the liquid guiding chamber 13 and exchanged with the rich solution on the inner wall of the desorption tank 10 through the side wall of the desorption tank 10, thereby heating the rich solution. This allows most of the carbon dioxide to be released during the flow of the rich solution on the side wall of the desorption tank 10. At this time, the power of the heating device can be reduced. Heat can be effectively utilized throughout the process, and the rich solution can be continuously introduced and the lean solution can be continuously discharged. The desorption process can be started or interrupted according to the demand for carbon dioxide, and the desorption rate can be increased or decreased.

[0036] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A carbon dioxide storage device, characterized in that: It includes a desorption tank (10), a heat insulation ring (11) fitted on the outer wall of the desorption tank (10), a liquid inlet device (20) located at the upper end of the desorption tank (10), a heating device located at the bottom of the desorption tank (10), a pressurizing device (30) connected to the desorption tank (10), and a gas storage tank (40) connected to the pressurizing device (30); The upper and lower ends of the heat-insulating ring (11) are sealed to the outer wall of the desorption tank (10). An annular liquid guiding cavity (13) is provided between the heat-insulating ring (11) and the outer wall of the desorption tank (10). The lower end of the liquid guiding cavity (13) is connected to the lower end of the desorption tank (10) through a first conduit (14). The upper end of the liquid guiding cavity (13) is connected to a second conduit (16). A pump body (15) is provided on the first conduit (14).

2. The carbon dioxide storage device according to claim 1, characterized in that: The liquid inlet device (20) includes an annular and hollow liquid inlet plate (21) disposed at the upper end of the desorption tank (10), a plurality of liquid inlet holes (22) opened on the lower side of the liquid inlet plate (21), and a liquid inlet pipe (23) connected to the upper side of the liquid inlet plate (21). The outer wall of the liquid inlet plate (21) is attached to the inner wall of the desorption tank (10).

3. The carbon dioxide storage device according to claim 2, characterized in that: The inner wall of the desorption tank (10) is provided with a plurality of guide rings (17), the guide rings (17) are fixedly connected to the inner wall of the desorption tank (10), the guide rings (17) are provided with a plurality of liquid guiding holes, the height of the inner wall of the guide rings (17) is higher than the height of the outer wall, and the plurality of guide rings (17) are evenly distributed in the vertical direction.

4. The carbon dioxide storage device according to claim 2, characterized in that: The upper end of the desorption container (10) is provided with an annular sealing ring (19), and there is a gap between the sealing ring (19) and the inner wall of the desorption container (10); The liquid inlet plate (21) is positioned between the sealing ring (19) and the desorption tank (10). The upper end of the sealing ring (19) is provided with an exhaust hood (110), which is connected to the pressurizing device (30) through an exhaust pipe (111).

5. The carbon dioxide storage device according to claim 4, characterized in that: The pressurizing device (30) includes a compressor (31) connected to the exhaust pipe (111); the outlet of the compressor (31) is connected to the air storage tank (40); a first valve (113) is provided at the connection between the exhaust pipe (111) and the air inlet of the compressor (31).

6. The carbon dioxide storage device according to claim 5, characterized in that: A spiral heat exchange tube (32) is provided between the sealing ring (19) and the desorption tank (10). Both ends of the heat exchange tube (32) pass through the side wall of the desorption tank (10) and extend outward. One end of the heat exchange tube (32) is connected to the outlet of the compressor (31), and the other end is connected to the gas storage tank (40). A second valve (33) is provided at the connection between the heat exchange tube (32) and the outlet of the compressor (31), and a third valve (34) is provided at the other end of the heat exchange tube (32); the heat exchange tube (32) is located below the liquid inlet plate (21), and gaps are provided between the heat exchange tube (32) and the outer wall of the sealing ring (19) and the inner wall of the desorption tank (10).

7. The carbon dioxide storage device according to claim 6, characterized in that: The exhaust pipe (111) is equipped with a drying tank (112), and the drying tank (112) is equipped with a molecular sieve.

8. The carbon dioxide storage device according to claim 7, characterized in that: A buffer tank (35) is provided between the heat exchange tube (32) and the gas storage tank (40), and a pressure valve (36) is provided between the buffer tank (35) and the gas storage tank (40).

9. The carbon dioxide storage device according to claim 8, characterized in that: The buffer tank (35) and the drying tank (112) are connected at one end near the compressor (31) via a backflush pipe (37), and the backflush pipe (37) is provided with a fourth valve (38).

10. The carbon dioxide storage device according to claim 1, characterized in that: The heating device includes an electric heating plate (12) located at the bottom of the desorption container (10).

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