A rectification separation and purification device for CO2 with a high purification rate

Abstract

The present invention discloses a rectification separation and purification device for CO2 with a high purification rate, which includes a rectification column. The top of the rectification column is connected to an upper gas outlet pipe. One end of the upper gas outlet pipe away from the rectification column is connected to a condenser. The liquid outlet of the condenser is connected to an upper reflux pipe, and the liquid outlet of the condenser is connected to an upper discharge pipe. The bottom of the rectification column is connected to a lower liquid outlet pipe. One end of the lower liquid outlet pipe away from the rectification column is connected to a reboiler. The gas outlet of the reboiler is connected to a lower reflux pipe. When the set rotating shaft rotates, it can drive the rotating frame to rotate. The heavy liquid flowing from top to bottom inside the rectification column will fall into the inside of the rotating frame, while the light gas flowing from bottom to top will blow open the small gas cap through the small ventilation holes, and then contact the heavy liquid, and exchange the light substances and heavy substances inside each other. In addition, the rotating rotating frame can make the light gas and the heavy liquid contact each other more fully, improving the rectification effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of CO2 purification, and particularly relates to a rectification separation and purification device for CO2 with high purification rate. Background Art

[0002] At present, the pollution of carbon dioxide waste gas to the atmosphere is becoming more and more serious. Excessive and unrestricted emissions of carbon dioxide in various industrial processes will cause a terrible greenhouse effect in the atmosphere, which will have a catastrophic impact on the human living environment. On the other hand, carbon dioxide is a very valuable carbon resource and can be used in various fields such as chemical industry, machinery, food, and agriculture, with very wide uses. Therefore, how to recycle, purify and reuse carbon dioxide in various industrial waste gases has become an increasingly important topic.

[0003] At present, a large amount of carbon dioxide and heat are emitted during industrial production, especially during thermal power generation. Carbon dioxide is a greenhouse gas that will cause certain damage to the environment, and the direct emission of heat also causes certain waste. Utilizing these carbon dioxide and heat can save energy and reduce emissions. However, in the process of gas liquefaction of existing carbon dioxide rectification and purification devices, unliquefied gas is easily doped, resulting in insufficient purity of carbon dioxide and affecting subsequent processing; in the process of carbon dioxide rectification and purification of existing carbon dioxide rectification and purification devices, the doped gas is not thoroughly adsorbed and purified, affecting the purity of carbon dioxide. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a rectification separation and purification device for CO2 with high purification rate, which solves the problem that in the process of carbon dioxide rectification and purification of the existing carbon dioxide rectification and purification device, the doped gas is not thoroughly adsorbed and purified, affecting the purity of carbon dioxide.

[0005] To achieve the above object, the present invention provides the following technical solution: A rectification separation and purification device for CO2 with high purification rate, including a rectification tower. The top of the rectification tower is connected to an upper air outlet pipe. The end of the upper air outlet pipe far from the rectification tower is connected to a condenser. The liquid outlet of the condenser is connected to an upper reflux pipe, and the liquid outlet of the condenser is connected to an upper discharge pipe. The bottom of the rectification tower is connected to a lower liquid outlet pipe. The end of the lower liquid outlet pipe far from the rectification tower is connected to a reboiler. The gas outlet of the reboiler is connected to a lower reflux pipe, and the gas outlet of the reboiler is connected to a lower discharge pipe. The top of one side of the rectification tower is connected to a lower air inlet hole, and the bottom of the rectification tower connected to the side of the lower air inlet hole is connected to an upper liquid inlet hole. A tray is fixedly installed inside the rectification tower. The top of the rectification tower is connected by a bearing to a rotating shaft. An air supply disk is fixedly installed on the outer side of the rotating shaft. A rotating frame is fixedly installed on the outer side of the rotating shaft. A conical gear A is fixedly installed at the top of the rotating shaft. A support plate is fixedly installed at the top of the rectification tower. A top plate is fixedly installed on the top of the support plate. A driving motor is fixedly installed on the top of the top plate. The output end of the driving motor is fixedly connected to a speed reducer. A rotating rod is fixedly installed at the output end of the speed reducer. A conical gear B is fixedly installed at the end of the rotating rod far from the speed reducer.

[0006] Preferably, the end of the upper reflux pipe far from the condenser is connected to the top of one side of the rectification tower, and the end of the lower reflux pipe far from the reboiler is connected to the bottom of one side of the rectification tower.

[0007] By adopting the above technical solution, the advantage is that the light gas discharged from the top of the rectification tower can enter the condenser to be condensed into a liquid, and then flow back into the rectification tower through the upper reflux pipe. The heavy liquid discharged from the bottom of the rectification tower will enter the reboiler to be heated and boiled to generate gas, and then flow back into the rectification tower through the lower reflux pipe.

[0008] Preferably, the specifications of the conical gear A and the conical gear B are adapted to each other, and the external teeth of the conical gear A and the external teeth of the conical gear B are meshed with each other.

[0009] By adopting the above technical solution, the advantage is that after the driving motor is started, it drives the rotating rod to rotate after being decelerated by the speed reducer. After the rotating rod rotates, it can drive the rotating shaft to rotate through the conical gear A and the conical gear B.

[0010] Preferably, the air supply disk includes an outer ring and air supply blades. One end of the air supply blades is connected to the outer side of the rotating shaft, and the end of the air supply blades far from the rotating shaft is connected to the inner side of the outer ring.

[0011] By adopting the above technical solution, the advantage is that when the rotating shaft rotates, it can drive the air supply disk to rotate. When the air supply disk rotates, the air supply blades can enhance the upward flow intensity of the light gas inside the rectification tower. The function of the outer ring is to protect the air supply blades.

[0012] Preferably, the rotating frame includes a frame body. A plurality of connecting soft strips B are fixedly installed at the bottom of the inner cavity of the frame body. One side of each of the plurality of connecting soft strips B is fixedly equipped with a small air cap. A plurality of small ventilation holes are formed in the bottom of the frame body. The specification size of the small air cap is larger than that of the small ventilation hole, and a plurality of small air caps are respectively located above a plurality of ventilation holes.

[0013] By adopting the above technical solution, the advantage is that when the rotating shaft rotates, it can drive the rotating frame to rotate. The heavy liquid flowing from top to bottom inside the rectifying column will fall into the inside of the rotating frame, and the light gas flowing from bottom to top will blow open the small air caps through the small ventilation holes, and then come into contact with the heavy liquid, and exchange the light substances and heavy substances inside each other. In addition, the rotating rotating frame can make the light gas and the heavy liquid contact more fully, improving the rectifying effect. In addition, when the heavy liquid inside the rotating frame is too full, it will overflow.

[0014] Preferably, the tray includes a plate body and a large air cap. A large ventilation hole is formed inside the plate body. The specification size of the large air cap is larger than that of the large ventilation hole, and the large air cap is located directly above the large ventilation hole. An overflow plate is fixedly installed at the top of one side of the plate body. A drainage plate is fixedly installed at the bottom of the overflow plate. A downcomer is communicated with the bottom of the other side of the plate body. A sliding plate is fixedly installed at the bottom of the large air cap. A limiting ring is fixedly installed at the bottom of the sliding plate, and the specification size of the limiting ring is larger than that of the large ventilation hole. A connecting soft strip A is fixedly installed at the top of the large air cap. A micro air cap is fixedly installed on one side of the connecting soft strip A. A micro ventilation hole is formed inside the large air cap. The specification size of the micro air cap is larger than that of the micro ventilation hole, and the micro air cap is located directly above the micro ventilation hole.

[0015] By adopting the above technical solution, the advantage is that the heavy liquid flowing from top to bottom inside the rectifying column will fall into the inside of the tray, and the light gas flowing from bottom to top will blow open the large air cap and the micro air cap through the large ventilation hole and the micro ventilation hole, and then come into contact with the heavy liquid, and exchange the light substances and heavy substances inside each other, improving the rectifying effect.

[0016] Preferably, two arc-shaped baffles are fixedly installed on one side inside the rectifying column. Filters are fixedly installed at the top and bottom of the inner sides of the two arc-shaped baffles. The two arc-shaped baffles are respectively installed at the communicating parts of the upper liquid inlet hole and the lower air inlet hole with the rectifying column.

[0017] By adopting the above technical solution, the advantages are that the function of the arc-shaped baffle is to prevent the raw materials from impacting the inner wall of the rectification column and damaging the rectification column when the raw materials are injected through the upper liquid inlet hole and the lower air inlet hole. In addition, the filter cover can filter the raw materials entering through the upper liquid inlet hole and the lower air inlet hole.

[0018] Preferably, a filter disc B is fixedly installed at the top of the inner cavity of the rectification column, a filter disc A is fixedly installed inside the rectification column, and a filter disc C is fixedly installed at the bottom of the inner cavity of the rectification column.

[0019] By adopting the above technical solution, the advantages are that the functions of the filter disc B, the filter disc A and the filter disc C are to filter the heavy liquid and light gas inside the rectification column and improve the rectification effect.

[0020] Preferably, an installation frame is fixedly installed at the top of the top plate, a top cover is installed on the top of the installation frame through bolts, and both the driving motor and the reducer are located inside the installation frame.

[0021] By adopting the above technical solution, the advantages are that the functions of the installation frame and the top cover are to protect the driving motor and the reducer.

[0022] Preferably, a manhole is communicated with the front of the rectification column, a skirt support is fixedly installed at the bottom of the rectification column, and support legs are fixedly installed at the bottom of the skirt support.

[0023] By adopting the above technical solution, the advantages are that the function of the manhole is to facilitate maintenance personnel to enter the inside of the rectification column, and the functions of the skirt support and the support legs are to support the whole equipment.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. After the driving motor is started, it drives the rotating rod to rotate after being decelerated by the reducer. After the rotating rod rotates, it can drive the rotating shaft to rotate through the conical gear A and the conical gear B. When the rotating shaft rotates, it can drive the air supply disc to rotate. When the air supply disc rotates, the air supply blades can enhance the upward flow intensity of the light gas inside the rectification column. The function of the outer ring is to protect the air supply blades.

[0026] 2. When the rotating shaft rotates, it can drive the rotating frame to rotate. The heavy liquid flowing from top to bottom inside the rectification column will fall into the inside of the rotating frame, while the light gas flowing from bottom to top will blow open the small air cap through the small ventilation holes, and then contact the heavy liquid, and exchange the light substances and heavy substances inside with each other. In addition, the rotating rotating frame can make the light gas and the heavy liquid contact more fully, improving the rectification effect.

[0027] 3. The heavy liquid flowing downward inside the rectifying column set will fall into the interior of the tray, while the light gas flowing upward will blow open the large air cap and the small air cap through the large ventilation holes and small ventilation holes. When the volume of the light gas is small, it can rise through the small ventilation holes. When the volume of the light gas is large, it can rise through both the large ventilation holes and the small ventilation holes, then come into contact with the heavy liquid, and exchange the light substances and heavy substances inside each other. It has a wide range of applications and improves the rectification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional external structure schematic diagram of the present invention;

[0029] Figure 2 is a top three-dimensional structure schematic diagram of the present invention;

[0030] Figure 3 is a front cross-sectional structure schematic diagram of the present invention;

[0031] Figure 4 is a partial three-dimensional structure schematic diagram of the present invention;

[0032] Figure 5 is a three-dimensional structure schematic diagram of the tray of the present invention;

[0033] Figure 6 is a bottom view structure schematic diagram of the tray of the present invention.

[0034] In the figure: 1, rectifying column; 2, manhole; 3, lower air inlet hole; 4, skirt support; 5, support leg; 6, reboiler; 7, lower discharge pipe; 8, lower reflux pipe; 9, support plate; 10, upper reflux pipe; 11, upper discharge pipe; 12, condenser; 13, drive motor; 14, installation frame; 15, reducer; 16, rotating rod; 17, top plate; 18, upper liquid inlet hole; 19, top cover; 20, upper gas outlet pipe; 21, rotating shaft; 22, air supply disc; 2201, outer ring; 2202, air supply blade; 23, tray; 2301, plate body; 2302, large air cap; 2303, overflow plate; 2304, diversion plate; 2305, limiting ring; 2306, sliding plate; 2307, downcomer; 2308, small air cap; 2309, connecting soft strip A; 24, rotating frame; 2401, frame body; 2402, connecting soft strip B; 2403, small air cap; 25, filter disc A; 26, filter cover; 27, arc-shaped baffle; 28, filter disc B; 29, conical tooth A; 30, lower liquid outlet pipe; 31, conical tooth B; 32, filter disc C. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figures 1 - 6 shown, a rectification separation and purification device for CO2 with high purification rate includes a rectification tower 1. The top of the rectification tower 1 is connected to an upper gas outlet pipe 20. One end of the upper gas outlet pipe 20 away from the rectification tower 1 is connected to a condenser 12. The liquid outlet of the condenser 12 is connected to an upper reflux pipe 10. The liquid outlet of the condenser 12 is connected to an upper discharge pipe 11. The bottom of the rectification tower 1 is connected to a lower liquid outlet pipe 30. One end of the lower liquid outlet pipe 30 away from the rectification tower 1 is connected to a reboiler 6. The gas outlet of the reboiler 6 is connected to a lower reflux pipe 8. The gas outlet of the reboiler 6 is connected to a lower discharge pipe 7. The top on one side of the rectification tower 1 is connected to a lower air inlet hole 3. The bottom of the rectification tower 1 connected to the lower air inlet hole 3 is connected to an upper liquid inlet hole 18. Inside the rectification tower 1, a tray 23 is fixedly installed. The top of the rectification tower 1 is connected by a bearing to a rotating shaft 21. On the outer side of the rotating shaft 21, a blowing disc 22 is fixedly installed. On the outer side of the rotating shaft 21, a rotating frame 24 is fixedly installed. At the top of the rotating shaft 21, a bevel gear A 29 is fixedly installed. On the top of the rectification tower 1, a support plate 9 is fixedly installed. On the top of the support plate 9, a top plate 17 is fixedly installed. On the top of the top plate 17, a driving motor 13 is fixedly installed. The output end of the driving motor 13 is fixedly connected to a speed reducer 15. The output end of the speed reducer 15 is fixedly installed with a rotating rod 16. The end of the rotating rod 16 away from the speed reducer 15 is fixedly installed with a bevel gear B 31.

[0037] The working principle of the above technical solution is as follows:

[0038] Start the drive motor 13. After the drive motor 13 starts, it drives the rotating rod 16 to rotate after being decelerated by the speed reducer 15. After the rotating rod 16 rotates, it can drive the rotating shaft 21 to rotate through the conical gear A 29 and the conical gear B 31. When the rotating shaft 21 rotates, it can drive the air supply disc 22 to rotate. When the air supply disc 22 rotates, it can enhance the upward flow intensity of the light gas inside the rectification tower 1. The mixed gas containing CO2 can be injected into the rectification tower 1 through the lower air inlet hole 3. The mixed gas flows from bottom to top, and then is introduced into the inside of the condenser 12 through the upper discharge pipe 11, where it is condensed into a liquid, and then flows back into the rectification tower 1 through the upper reflux pipe 10. The heavy liquid flowing from top to bottom inside the rectification tower 1 will fall into the inside of the tray 23 and the rotating frame 24, and the light gas flowing from bottom to top will contact the heavy liquid and exchange the light substances and heavy substances inside each other, improving the rectification effect. In addition, the heavy liquid discharged from the bottom of the rectification tower 1 will enter the inside of the reboiler 6 to be heated and boiled to generate gas, and then flow back into the rectification tower 1 through the lower reflux pipe 8, so as to perform repeated rectification to improve the purity of the produced CO2.

[0039] In another embodiment, as Figures 1 - 3 shown, the end of the upper reflux pipe 10 far from the condenser 12 is communicated with the top on one side of the rectification tower 1, and the end of the lower reflux pipe 8 far from the reboiler 6 is communicated with the bottom on one side of the rectification tower 1.

[0040] The light gas discharged from the top of the rectification tower 1 can enter the inside of the condenser 12 to be condensed into a liquid, and then flow back into the rectification tower 1 through the upper reflux pipe 10. The heavy liquid discharged from the bottom of the rectification tower 1 will enter the inside of the reboiler 6 to be heated and boiled to generate gas, and then flow back into the rectification tower 1 through the lower reflux pipe 8.

[0041] In another embodiment, as Figures 1 - 6 shown, the specifications of the conical gear A 29 and the conical gear B 31 are adapted to each other, the external teeth of the conical gear A 29 are meshed with the external teeth of the conical gear B 31. The air supply disc 22 includes an outer ring 2201 and air supply blades 2202. One end of the air supply blade 2202 is connected to the outside of the rotating shaft 21, and the end of the air supply blade 2202 far from the rotating shaft 21 is connected to the inside of the outer ring 2201. The rotating frame 24 includes a frame body 2401. A plurality of connecting soft strips B 2402 are fixedly installed at the bottom of the inner cavity of the frame body 2401. A small air cap 2403 is fixedly installed on one side of each of the plurality of connecting soft strips B 2402. A plurality of small ventilation holes are opened at the bottom of the frame body 2401. The specification size of the small air cap 2403 is larger than the specification size of the small ventilation holes, and the plurality of small air caps 2403 are respectively located above the plurality of ventilation holes.

[0042] After the drive motor 13 is started, it drives the rotating rod 16 to rotate after being decelerated by the speed reducer 15. After the rotating rod 16 rotates, it can drive the rotating shaft 21 to rotate through the bevel gear A 29 and the bevel gear B 31. When the rotating shaft 21 rotates, it can drive the air supply disc 22 to rotate. When the air supply disc 22 rotates, the air supply blades 2202 can enhance the upward flow intensity of the light gas inside the rectification tower 1. The function of the outer ring 2201 is to protect the air supply blades 2202. When the rotating shaft 21 rotates, it can drive the rotating frame 24 to rotate. The heavy liquid flowing from top to bottom inside the rectification tower 1 will fall into the inside of the rotating frame 24, and the light gas flowing from bottom to top will blow open the small air cap 2403 through the small ventilation holes, and then contact the heavy liquid, and exchange the light substances and heavy substances inside each other. In addition, the rotating rotating frame 24 can make the light gas and the heavy liquid contact more fully, improving the rectification effect. In addition, when the heavy liquid inside the rotating frame 24 is too full, it will overflow.

[0043] In another embodiment, as Figures 3 - 5 shown, the tray 23 includes a plate body 2301 and a large air cap 2302. A large ventilation hole is opened inside the plate body 2301. The specification size of the large air cap 2302 is larger than the specification size of the large ventilation hole, and the large air cap 2302 is located directly above the large ventilation hole. An overflow plate 2303 is fixedly installed at the top of one side of the plate body 2301. A drainage plate 2304 is fixedly installed at the bottom of the overflow plate 2303. A downcomer 2307 is communicated with the bottom of the other side of the plate body 2301. A sliding plate 2306 is fixedly installed at the bottom of the large air cap 2302. A limiting ring 2305 is fixedly installed at the bottom of the sliding plate 2306, and the specification size of the limiting ring 2305 is larger than the specification size of the large ventilation hole. A connecting soft strip A 2309 is fixedly installed at the top of the large air cap 2302. A micro air cap 2308 is fixedly installed on one side of the connecting soft strip A 2309. A micro ventilation hole is opened inside the large air cap 2302. The specification size of the micro air cap 2308 is larger than the specification size of the micro ventilation hole, and the micro air cap 2308 is located directly above the micro ventilation hole.

[0044] The heavy liquid flowing from top to bottom inside the rectification tower 1 will fall into the inside of the tray 23, and the light gas flowing from bottom to top will blow open the large air cap 2302 and the micro air cap 2308 through the large ventilation hole and the micro ventilation hole, and then contact the heavy liquid, and exchange the light substances and heavy substances inside each other, improving the rectification effect.

[0045] In another embodiment, as Figure 3As shown in the figure, two arc-shaped baffles 27 are fixedly installed on one side inside the rectifying column 1. Filter covers 26 are fixedly installed at the top and bottom inside the two arc-shaped baffles 27. The two arc-shaped baffles 27 are respectively installed at the connection of the upper liquid inlet hole 18 and the lower air inlet hole 3 with the rectifying column 1. A filter disk B 28 is fixedly installed at the top of the inner cavity of the rectifying column 1. A filter disk A 25 is fixedly installed inside the rectifying column 1. A filter disk C 32 is fixedly installed at the bottom of the inner cavity of the rectifying column 1.

[0046] The function of the arc-shaped baffle 27 is to prevent the raw materials from impacting the inner wall of the rectifying column 1 and damaging the rectifying column 1 when the raw materials are injected through the upper liquid inlet hole 18 and the lower air inlet hole 3. In addition, the filter cover 26 can filter the raw materials entering through the upper liquid inlet hole 18 and the lower air inlet hole 3. The functions of the filter disk B 28, the filter disk A 25 and the filter disk C 32 are to filter the heavy liquid and light gas inside the rectifying column 1 and improve the rectifying effect.

[0047] In another embodiment, as Figures 1 - 2 shown, an installation frame 14 is fixedly installed on the top of the top plate 17. A top cover 19 is installed on the top of the installation frame 14 through bolts. The driving motor 13 and the reducer 15 are both located inside the installation frame 14.

[0048] The functions of the installation frame 14 and the top cover 19 are to protect the driving motor 13 and the reducer 15.

[0049] In another embodiment, as Figures 1 - 2 shown, a manhole 2 is connected to the front of the rectifying column 1. A skirt support 4 is fixedly installed at the bottom of the rectifying column 1. Support legs 5 are fixedly installed at the bottom of the skirt support 4.

[0050] The function of the manhole 2 is to facilitate maintenance personnel to enter the inside of the rectifying column 1. The functions of the skirt support 4 and the support legs 5 are to support the whole equipment.

[0051] Working principle and usage process of the present invention: Start the drive motor 13. After the drive motor 13 starts, it drives the rotating rod 16 to rotate after being decelerated by the reducer 15. After the rotating rod 16 rotates, it can drive the rotating shaft 21 to rotate through the bevel gear A 29 and the bevel gear B 31. When the rotating shaft 21 rotates, it can drive the air supply disc 22 to rotate. When the rotating shaft 21 rotates, it can drive the air supply disc 22 to rotate. When the air supply disc 22 rotates, the air supply blades 2202 can enhance the upward flow intensity of the light gas inside the rectifying column 1. The function of the outer ring 2201 is to protect the air supply blades 2202. The mixed gas containing CO2 can be injected into the rectifying column 1 through the lower air inlet hole 3. The mixed gas flows from bottom to top, and then is introduced into the inside of the condenser 12 through the upper discharge pipe 11, condensed into a liquid, and then flows back into the rectifying column 1 through the upper return pipe 10. When the rotating shaft 21 rotates, it can drive the rotating frame 24 to rotate. The heavy liquid flowing from top to bottom inside the rectifying column 1 will fall into the inside of the rotating frame 24 and the tray 23, while the light gas flowing from bottom to top will blow open the small air cap 2403, the large air cap 2302 and the micro air cap 2308 through the small vent holes, large vent holes and micro vent holes, and then come into contact with the heavy liquid and exchange the light substances and heavy substances inside each other. In addition, the rotating rotating frame 24 can make the contact between the light gas and the heavy liquid more sufficient, improving the rectification effect. In addition, the heavy liquid discharged from the bottom of the rectifying column 1 will enter the reboiler 6 for heating and boiling to generate gas, and then flow back into the rectifying column 1 through the lower return pipe 8, so as to carry out repeated rectification and improve the purity of the produced CO2.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rectification separation and purification device for CO2 with high purification rate, comprising a rectification column (1), characterized in that: The top of the rectifying column (1) is connected to an upper gas outlet pipe (20). One end of the upper gas outlet pipe (20) away from the rectifying column (1) is connected to a condenser (12). The liquid outlet of the condenser (12) is connected to an upper reflux pipe (10). The liquid outlet of the condenser (12) is connected to an upper discharge pipe (11). The bottom of the rectifying column (1) is connected to a lower liquid outlet pipe (30). One end of the lower liquid outlet pipe (30) away from the rectifying column (1) is connected to a reboiler (6). The gas outlet of the reboiler (6) is connected to a lower reflux pipe (8). The gas outlet of the reboiler (6) is connected to a lower discharge pipe (7). A lower air inlet hole (3) is connected to the top on one side of the rectifying column (1). The bottom on the side of the rectifying column (1) connected to the lower air inlet hole (3) is connected to an upper liquid inlet hole (18). A tray (23) is fixedly installed inside the rectifying column (1). The top of the rectifying column (1) is connected to a rotating shaft (21) through a bearing. A blowing disc (22) is fixedly installed on the outer side of the rotating shaft (21). A rotating frame (24) is fixedly installed on the outer side of the rotating shaft (21). A conical gear A (29) is fixedly installed at the top of the rotating shaft (21). A support plate (9) is fixedly installed at the top of the rectifying column (1). A top plate (17) is fixedly installed on the top of the support plate (9). A driving motor (13) is fixedly installed on the top of the top plate (17). The output end of the driving motor (13) is fixedly connected to a speed reducer (15). A rotating rod (16) is fixedly installed at the output end of the speed reducer (15). A conical gear B (31) is fixedly installed at the end of the rotating rod (16) away from the speed reducer (15); The rotating frame (24) includes a frame body (2401). A plurality of connecting soft strips B (2402) are fixedly installed at the bottom of the inner cavity of the frame body (2401). A small air cap (2403) is fixedly installed on one side of each of the plurality of connecting soft strips B (2402). A plurality of small ventilation holes are formed in the bottom of the frame body (2401). The specification size of the small air cap (2403) is larger than that of the small ventilation holes, and the plurality of small air caps (2403) are respectively located above the plurality of ventilation holes; The tray (23) includes a plate body (2301) and a large air cap (2302). A large ventilation hole is formed in the plate body (2301). The specification size of the large air cap (2302) is larger than that of the large ventilation hole, and the large air cap (2302) is located directly above the large ventilation hole; A connecting soft strip A (2309) is fixedly installed at the top of the large air cap (2302). A micro air cap (2308) is fixedly installed on one side of the connecting soft strip A (2309). A micro ventilation hole is formed in the large air cap (2302). The specification size of the micro air cap (2308) is larger than that of the micro ventilation hole, and the micro air cap (2308) is located directly above the micro ventilation hole.

2. The rectification separation and purification device for CO2 with high purification rate according to claim 1, wherein: One end of the upper reflux pipe (10) away from the condenser (12) is communicated with the top of one side of the rectifying column (1), and one end of the lower reflux pipe (8) away from the reboiler (6) is communicated with the bottom of one side of the rectifying column (1).

3. The rectification separation and purification device for CO2 with high purification rate according to claim 1, characterized in that: The specifications of the conical tooth A (29) are adapted to the specifications of the conical tooth B (31), and the external teeth of the conical tooth A (29) are engaged with the external teeth of the conical tooth B (31).

4. A rectification separation and purification device for CO2 with high purification rate according to claim 1, characterized in that: The air supply disc (22) includes an outer ring (2201) and air supply blades (2202). One end of the air supply blade (2202) is connected to the outer side of the rotating shaft (21), and the end of the air supply blade (2202) away from the rotating shaft (21) is connected to the inner side of the outer ring (2201).

5. A rectification separation and purification device for CO2 with high purification rate according to claim 1, characterized in that: An overflow plate (2303) is fixedly installed at the top of one side of the plate body (2301). A drainage plate (2304) is fixedly installed at the bottom of the overflow plate (2303). A downcomer (2307) is communicated with the bottom of the other side of the plate body (2301). A slide plate (2306) is fixedly installed at the bottom of the large air cap (2302). A limiting ring (2305) is fixedly installed at the bottom of the slide plate (2306), and the specification size of the limiting ring (2305) is larger than the specification size of the large ventilation hole.

6. A rectification separation and purification device for CO2 with high purification rate according to claim 1, characterized in that: Two arc-shaped baffles (27) are fixedly installed on one side inside the rectifying column (1). Filters (26) are fixedly installed at the top and bottom of the inner sides of the two arc-shaped baffles (27). The two arc-shaped baffles (27) are respectively installed at the communication positions of the upper liquid inlet hole (18) and the lower air inlet hole (3) with the rectifying column (1).

7. A rectification separation and purification device for CO2 with high purification rate according to claim 1, characterized in that: A filter disc B (28) is fixedly installed at the top of the inner cavity of the rectifying column (1), a filter disc A (25) is fixedly installed inside the rectifying column (1), and a filter disc C (32) is fixedly installed at the bottom of the inner cavity of the rectifying column (1).

8. The rectification separation and purification device for CO2 with high purification rate according to claim 1, characterized in that: An installation frame (14) is fixedly installed at the top of the top plate (17). A top cover (19) is installed on the top of the installation frame (14) by bolts. The driving motor (13) and the reducer (15) are both located inside the installation frame (14).

9. A rectification separation and purification device for CO2 with high purification rate according to claim 1, characterized in that: A manhole (2) is communicated with the front of the rectifying column (1). A skirt support (4) is fixedly installed at the bottom of the rectifying column (1). Support legs (5) are fixedly installed at the bottom of the skirt support (4).

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