Barrel-shaped device for capturing low-concentration carbon dioxide in air

Abstract

The barrel-shaped device comprises a barrel-shaped shell and a solar power supply system arranged on the barrel-shaped shell, a draught fan is arranged on the side portion of the upper end of the barrel-shaped shell, a ventilation opening is formed in the side portion of the lower end of the barrel-shaped shell, and a carbon dioxide absorption structure is further arranged in the barrel-shaped shell. The carbon dioxide absorption structure comprises a vertical supporting column and a plurality of absorption modules which are evenly arranged on the side portion of the supporting column at intervals along the circumference, each absorption module comprises sheet-plate-shaped adsorption fibers and a fixing frame of the adsorption fibers, and the adsorption fibers are provided with liquid films formed by infiltrating carbon dioxide absorption liquid. The solar panel is arranged at the top end of the device, power can be automatically generated for fan operation and infusion pump operation, extra energy input is not needed, dust and rainwater can be effectively blocked through the barrel-shaped structure, and the device is small in overall structure and can be distributed at all high-concentration CO2 point positions where people are dense according to requirements.

Description

Technical Field

[0001] This invention relates to the field of air carbon dioxide (CO2) capture technology, and more specifically to a barrel-shaped device for capturing low concentrations of carbon dioxide in the air. Background Technology

[0002] Carbon capture, utilization, and storage (CCUS) technologies for reducing CO2 emissions are receiving increasing attention, with direct air capture (DAC) being particularly effective at directly reducing CO2 concentrations in the air. However, the low CO2 concentrations in the air (400–500 ppm) currently result in high capture costs. Therefore, improving capture methods and devices to reduce costs is crucial.

[0003] When directly applied to air CO2 capture, the low CO2 concentration (300-400 ppm) and poor gas-liquid mass transfer result in low absorption efficiency and capacity. Therefore, methods such as packing or spraying are typically used for capture. For example, Carbon Engineering, a company that manufactures CO2 capture devices based on this technology, has disclosed several (CN102202766 A, CN 116615279 A). These devices increase the contact area between the solution and air by spraying the solution directly onto packing material and allowing it to flow slowly, while an external fan blows in a large amount of air to capture CO2. While these devices are simple to operate, solution loss during purging is unavoidable, causing some environmental pollution. Furthermore, the spraying methods used in the absorption process increase energy consumption.

[0004] Most existing CO2 capture devices occupy too much space, and the CO2 concentration distribution is not uniform (the normal concentration in a natural environment is 400 ppm, while the CO2 concentration in densely populated places can rise to over 500 ppm), making it impossible to place the capture devices in high-CO2 concentration areas. Therefore, if a green energy-driven air CO2 capture device could be designed that occupies less space and can be flexibly placed in high-CO2 scenarios, it would greatly promote the widespread use of DAC technology.

[0005] This invention innovatively designs a green energy-driven barrel-shaped device for capturing low-concentration CO2 in the air. Compared with traditional capture devices, it further reduces capture energy consumption and occupies a small area. It can be flexibly placed at various capture points with high CO2 concentrations as needed. After capture, it can be centrally regenerated by transporting saturated absorption solution through pipelines, which is beneficial for subsequent CO2 utilization and has broad application prospects. Summary of the Invention

[0006] To address the aforementioned technical problems in existing technologies, the purpose of this application is to provide a barrel-shaped device for capturing low-concentration carbon dioxide in the air. To address the issue of excessively low CO2 concentrations and slow capture rates, an array of absorption modules ensures sufficient contact between the air and the adsorption fibers of the impregnated liquid film, thereby increasing the capture rate. Simultaneously, a solar power system supplies power to drive a fan, further increasing the air intake. Furthermore, the device utilizes a rich liquid circulation system to increase the CO2 content in the rich liquid, reducing the energy consumption per unit of CO2 regeneration during subsequent rich liquid thermal desorption.

[0007] The technical solution adopted in this invention is as follows:

[0008] A barrel-shaped device for capturing low concentrations of carbon dioxide in the air includes a barrel-shaped shell and a solar power supply system disposed on the barrel-shaped shell. A fan is disposed on the upper side of the barrel-shaped shell and a vent is disposed on the lower side. A carbon dioxide absorption structure is disposed inside the barrel-shaped shell. The carbon dioxide absorption structure includes a vertical support column and a plurality of absorption modules evenly spaced along the circumference on the side of the support column. The absorption module includes a plate-shaped adsorption fiber and its fixing frame. The adsorption fiber has a liquid film formed by being wetted with carbon dioxide absorption liquid.

[0009] Furthermore, the solar power supply system includes a solar panel mounted on the top of the barrel-shaped shell and a battery disposed inside the barrel-shaped shell. The solar panel and the battery are electrically connected, and the battery supplies power to each power-consuming unit of the system.

[0010] Furthermore, the fixed frame of the absorption module includes two stainless steel mesh sheets and two fixing steel sheets. The adsorption fibers are sandwiched between the two stainless steel mesh sheets, and the outer sides of the two stainless steel mesh sheets are further clamped and fixed by the two fixing steel sheets, which are then fixed together by bolts.

[0011] Furthermore, the barrel-shaped shell is also equipped with an absorbent liquid storage tank, a cleaning liquid storage tank, and an infusion pump. Multiple liquid dispensing pipes are evenly spaced along the circumference on the upper side of the support column. Each liquid dispensing pipe corresponds to an absorption module and the number of each is the same. A liquid dispensing pipe is set above the absorption module. Several drip holes are spaced along the length of the bottom of the liquid dispensing pipe. The drip holes are located directly above the adsorption fibers of the corresponding absorption module.

[0012] The infusion pump has two inlets, which are connected to the absorption liquid storage tank and the cleaning liquid storage tank respectively by pipelines. The outlet of the infusion pump is connected to each of the liquid dispensing drip tubes.

[0013] The barrel-shaped shell is also equipped with a drip recovery structure, which is located below each of the absorption modules and is used to collect the solution dripping from the absorption modules. The outlet of the drip recovery structure is further divided into two paths, which are connected to the absorption liquid storage tank and the cleaning liquid storage tank by pipelines respectively.

[0014] Control valves are installed on all the corresponding pipelines.

[0015] Furthermore, a PLC central control module is provided on the barrel-shaped housing. The PLC central control module is connected to the infusion pump via a signal, and the operation of the infusion pump is controlled by the PLC central control module.

[0016] Furthermore, the support column has a hollow internal structure, and a support fixing seat is provided at the bottom of the support column. A main infusion pipe is installed inside the support column. The lower inlet of the main infusion pipe passes through the lower side of the support column and is connected to the outlet of the infusion pump by a pipeline. The upper outlet of the main infusion pipe passes through the upper end of the support column and is connected to multiple pipeline branches. The number of pipeline branches corresponds to the number of liquid dispensing drip tubes, and the two are connected in a one-to-one correspondence.

[0017] The two ends of the liquid dispensing tube are sealed, and one end is fixedly mounted on the upper side of the support column.

[0018] Furthermore, the droplet recovery structure includes an annular collection tank and multiple liquid return tanks. The liquid return tanks correspond one-to-one with the absorption modules and the number of both is the same. A liquid return tank is set below the absorption module and is located directly below the adsorption fiber of the corresponding absorption module.

[0019] One end of the liquid reflux tank is fixedly installed on the lower side of the support column;

[0020] The annular liquid collection tank is fixedly installed on the outer side of the support column and located below the liquid return tank; each liquid return tank is inclined toward the annular liquid collection tank and connected to the annular liquid collection tank through a liquid outlet pipe.

[0021] The bottom of the annular collection tank is equipped with a tank liquid outlet, which is divided into two paths that are connected to the absorption liquid storage tank and the cleaning liquid storage tank respectively by pipelines.

[0022] Furthermore, multiple fans are evenly spaced along the circumference on the upper side of the barrel-shaped shell. Observation windows are provided on the side wall of the barrel-shaped shell.

[0023] Compared with existing technologies, the technical effects achieved by this invention are as follows:

[0024] (1) Compared with existing CO2 air capture devices, the present invention uses solar panels to power the fan for CO2 capture, which improves the CO2 capture rate without the need for additional power supply, and can obtain a high concentration of CO2 capture solution through circulating spraying.

[0025] (2) Compared with existing CO2 air capture devices, the device of the present invention occupies less space, is more compact and convenient, and can be set up at any location with high wind speed (such as highway entrances) or high concentration (such as urban centers with high pedestrian traffic), making the capture more efficient. Moreover, after the capture is completed, the solution can be transported through pipelines to a centralized regeneration center for centralized regeneration, which facilitates the subsequent utilization of CO2.

[0026] In summary, this invention proposes a barrel-shaped device for capturing low concentrations of carbon dioxide in the air based on the solid-liquid film method. It rapidly absorbs carbon dioxide from the air with the help of a solar-powered fan, which is green, efficient, has low site requirements, high benefits, and causes no secondary pollution to the environment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the external structure of a barrel-shaped device for capturing low concentrations of carbon dioxide from the air.

[0028] Figure 2-4 This is a schematic diagram of the overall internal structure and some main structures of the device of the present invention;

[0029] Figure 5 This is a schematic diagram of the adsorption structure of the device of the present invention;

[0030] In the diagram: 1. Solar panel, 2. Fan, 3. Observation window, 4. PLC central control module, 5. Ventilation outlet, 6. Liquid inlet of drip irrigation pipe, 7. Liquid drip irrigation pipe, 8. Absorption module, 9. Liquid return tank, 10. Annular collection tank, 11. Tank liquid outlet, 12. Cleaning fluid storage tank, 13. Stainless steel fixing plate, 14. Drip hole, 15. Adsorption fiber, 16. Fixing steel plate, 17. Stainless steel mesh, 18. Connecting steel plate. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0032] As attached Figure 1-3 As shown, this patent provides a barrel-shaped device for capturing low concentrations of carbon dioxide in the air, and achieves efficient and large-scale capture of CO2 components in the air by using a solid-liquid film method for cyclic rinsing.

[0033] A barrel-shaped device for capturing low concentrations of carbon dioxide in the air includes a barrel-shaped shell and a solar power supply system disposed on the barrel-shaped shell. A fan 2 is disposed on the upper side of the barrel-shaped shell and a vent 5 is disposed on the lower side. A carbon dioxide absorption structure is also disposed inside the barrel-shaped shell. The carbon dioxide absorption structure includes a vertical support column and a plurality of absorption modules 8 evenly spaced along the circumference on the side of the support column. The absorption module 8 includes a plate-shaped adsorption fiber 15 and its fixing frame. The adsorption fiber 15 has a liquid film formed by being soaked in carbon dioxide absorption liquid.

[0034] The solar power system includes a solar panel 1 mounted on top of a cylindrical casing and a battery disposed inside the casing. The solar panel 1 is electrically connected to the battery, which supplies power to the various power-consuming units of the system. (Comparison) Figure 1 Multiple fans 2 are evenly spaced along the circumference on the upper side of the barrel-shaped shell. The solar power system can power the fans 2, enabling a high ventilation rate inside the barrel-shaped shell, which is beneficial for CO2 capture.

[0035] Comparison Figure 2 The absorption module 8 is arranged in a circular array around the support column. The absorption module 8 includes sheet-like adsorption fibers 15. Two stainless steel mesh sheets 17 are provided on opposite sides of each adsorption fiber 15 to provide rigid support; that is, the adsorption fiber 15 is clamped between the two stainless steel mesh sheets 17. Two clamping steel plates 16 are provided on the outermost left and right sides of the absorption module 8. The fixing steel plates 16 have a hollow frame structure with screw holes around their perimeter. Bolts and nuts are installed in the screw holes for overall fastening. That is, the outer sides of the two stainless steel mesh sheets 17 that clamp the adsorption fiber 15 are clamped and fixed by the two fixing steel plates 16. After aligning the screw holes around the two fixing steel plates 16, bolts are inserted and nuts are tightened to further secure the overall absorption module.

[0036] The barrel-shaped shell also houses an absorbent liquid storage tank, a cleaning liquid storage tank 12, and an infusion pump. Multiple distributing drip tubes 7 are evenly spaced along the circumference of the upper side of the support column. Each distributing drip tube 7 corresponds to one of the absorption modules 8, and the number of each module is the same. One distributing drip tube 7 is positioned above each absorption module 8. Several drip holes 14 are spaced along the length of the bottom of each distributing drip tube 7, located directly above the adsorption fibers 15 of the corresponding absorption module 8. The infusion pump has two inlets, connected to the absorbent liquid storage tank and the cleaning liquid storage tank 12 respectively via pipelines. The outlet of the infusion pump is connected to each of the distributing drip tubes 7, and control valves are installed on each of the corresponding pipelines.

[0037] Comparison Figure 1A PLC central control module 4 is installed on the barrel-shaped shell. The PLC central control module 4 is connected to the infusion pump via signal, and the operation of the infusion pump is controlled by the PLC central control module 4.

[0038] The support column has a hollow internal structure, with a support base at the bottom. A main infusion tube is installed inside the support column. The lower inlet of the main infusion tube exits from the lower side of the support column and is connected to the outlet of the infusion pump via a pipeline. The upper outlet of the main infusion tube exits from the upper end of the support column and is connected to multiple branch pipelines. The number of branch pipelines corresponds to the number of liquid dispensing drip tubes 7, and the two are connected one-to-one. Both ends of the liquid dispensing drip tube 7 are sealed, and one end is fixedly installed on the upper side of the support column.

[0039] Furthermore, both ends of the dispensing tube 7 are sealed. (Comparison) Figures 2-3 In this system, a steel plate 18 is welded and fixed to one end of the liquid-dispensing drip tube 7, and is fixedly connected to the support column via the steel plate 18. The steel plate 18 can be welded and fixed to the side of the support column and further reinforced by bolts. A drip tube liquid-dispensing inlet 6 is provided at one end of the liquid-dispensing drip tube 7 near the support column. The upper outlet of the main infusion pipe extends from the upper end of the support column and connects to multiple pipeline branches. Each pipeline branch is connected to the corresponding drip tube liquid-dispensing inlet 6 on the liquid-dispensing drip tube 7, so that the liquid transported by the pipeline branch enters the corresponding liquid-dispensing drip tube 7 through the drip tube liquid-dispensing inlet 6.

[0040] Furthermore, in comparison Figure 3 In this assembly, two stainless steel fixing plates 13 can be welded to the lower end of the liquid-dispensing drip tube 7. These two stainless steel fixing plates 13 are located on both sides of the dripping hole 14 at the bottom of the liquid-dispensing drip tube 7. After the absorption module 8 is assembled, the upper end of the outermost fixing steel plate 16 of its fixing frame extends between the two stainless steel fixing plates 13 at the lower end of the liquid-dispensing drip tube 7. Then, the upper end of the fixing steel plate 16 is fixedly connected to the two stainless steel fixing plates 13 using bolts, thus achieving the connection and fixation between the absorption module 8 and the liquid-dispensing drip tube 7. At this time, the adsorption fiber 15 of the absorption module 8 is located directly below the dripping hole 14 at the bottom of the liquid-dispensing drip tube 7, allowing the liquid dripping from the dripping hole 14 to enter the adsorption fiber 15.

[0041] The barrel-shaped shell is also equipped with a drip recovery structure, which is located below each of the absorption modules 8 and is used to collect the solution dripping from the absorption module 8. The outlet of the drip recovery structure is further divided into two paths, which are connected to the absorption liquid storage tank and the cleaning liquid storage tank 12 by pipelines respectively. Control valves are installed on the corresponding pipelines.

[0042] The droplet recovery structure includes an annular collection tank 10 and multiple liquid return tanks 9. The liquid return tanks 9 correspond one-to-one with the absorption modules 8 and the number of both is the same. A liquid return tank 9 is set below the absorption module 8 and is located directly below the adsorption fiber 15 of the corresponding absorption module 8.

[0043] One end of the liquid return tank 9 is fixedly installed on the lower side of the support column. The annular liquid collection tank 10 is fixedly installed on the outer side of the support column and located below the liquid return tank 9; each liquid return tank 9 is inclined towards the annular liquid collection tank 10 and connected to the annular liquid collection tank 10 through a liquid outlet pipe; the bottom of the annular liquid collection tank 10 is provided with a tank liquid outlet 11, which is divided into two paths and connected to the absorption liquid storage tank and the cleaning liquid storage tank 12 respectively by pipes.

[0044] To make the installation of the absorption module 8 more secure, a connector can also be installed on the liquid return tank 9. This connector is fixedly connected to the outermost fixing steel plate 16 of the fixing frame of the absorption module 8 to provide a certain support for the absorption module 8.

[0045] When the device of this application is in operation: during the impregnation stage of the carbon dioxide absorbent on the adsorption fiber 15, the carbon dioxide absorbent is stored in the absorbent storage tank. The carbon dioxide absorbent is delivered to the top of the absorption module 8 by the delivery pump and discharged through the drip holes at the bottom of the circumferentially arrayed liquid-distributing drip pipes 7 to drip and form a film on the adsorption fiber 15. The carbon dioxide absorbent that does not form a film is collected through the liquid return tank 9 and the annular collection tank 10 below, and then flows back to the absorbent storage tank to form a cycle until the carbon dioxide absorbent forms a film on the adsorption fiber 15.

[0046] When the adsorption fibers 15, soaked in carbon dioxide absorbent, complete the first CO2 capture, clean water is first added to the cleaning solution storage tank 12. Then, a pump is used to deliver the cleaning solution from the storage tank 12 to the top of the absorption module 8. The solution is discharged through the drip holes at the bottom of the circumferentially arranged distributing drip pipes 7, washing the adsorption fibers 15. The dripping CO2-rich solution is collected through the liquid return tank 9 and the annular collection tank 10 below, and then returned to the cleaning solution storage tank 12 to form a cycle until the liquid film is washed off the adsorption fibers 15. In subsequent washing and collection stages, the CO2-rich solution in the cleaning solution storage tank 12 is used for circulating washing until the CO2 adsorption concentration in the CO2-rich solution in the storage tank 12 reaches the concentration required for regeneration, at which point it is transported out for regeneration.

[0047]

Example

[0048] The structure of a barrel-shaped device for capturing low concentrations of carbon dioxide in the air is shown in the attached figure. Figure 1-5 As shown

[0049] In this embodiment, the absorption module 8 includes adsorption fibers 15 and a carbon dioxide absorption liquid membrane loaded on the adsorption fibers 15. There are eight absorption modules 8, which are evenly spaced around the support column.

[0050] The adsorption fiber 15 used in this embodiment is activated carbon fiber with a specific surface area of ​​1500 m². 2 / g, with pore size distribution concentrated in 1-3nm.

[0051] In this embodiment, the CO2 concentration in the air is approximately 400 ppm.

[0052] <Example 1>

[0053] First, cut out an area of ​​10m². 2 The activated carbon fiber is evenly divided into eight parts, and stainless steel mesh and fixing steel plates of corresponding sizes are cut out. The activated carbon fiber is fixed on the collection device. The absorbent used is an aqueous solution of ionic liquid synthesized by compounding dimethylimidazole (2-MI) and tetraethylenepentamine (TEPA) (molar ratio 2-MI:TEPA=1:1) (the mass ratio of [TEPA][2-MI] to water is 1:0.1). The absorbent is dripped onto the activated carbon fiber. Excess absorbent is collected through the liquid return tank 9 and the annular collection tank 10, and then returned to the absorbent storage tank for repeated impregnation until the absorbent is saturated on the activated carbon fiber and forms an absorbent liquid film.

[0054] In this embodiment, after the activated carbon fibers were impregnated with the absorbent, adsorption was performed at 293K under different wind velocities. The wind velocities were controlled by an external fan, with controlled wind velocities of 0 m / s, 2 m / s, and 4 m / s, respectively. The adsorption times were 2 h, 4 h, 6 h, and 8 h, respectively. After adsorption was complete, the absorbent on the activated carbon fibers was washed off with water to obtain a CO2-rich solution.

[0055] The CO2 content of the CO2-rich solution obtained after elution was detected. The adsorption capacity of the ionic liquid [TEPA][2-MI] for CO2 was calculated by titration with 10 mol / L hydrochloric acid. The unit conversion is CO2 (mol) / [TEPA][2-MI] (kg). The specific data is shown in Table 1.

[0056] Table 1. CO2 adsorption capacity of carbon fibers loaded with [TEPA][2-MI] aqueous solution at different wind velocities at different times

[0057]

[0058] <Example 2>

[0059] The [TEPA][2-MI] aqueous solution from Example 1 was subjected to cyclic rinsing enrichment, with all steps identical to those in Example 1, except the air velocity was fixed at 2 m / s. After adsorption, the solution was first rinsed with water and collected as rich solution ①. Subsequently, the activated carbon fibers were rinsed and impregnated with the absorbent solution to allow the absorbent to re-coat the activated carbon fibers. Adsorption continued for 2 hours under an air velocity of 2 m / s. After adsorption, the solution was rinsed with rich solution ① and collected as rich solution ②. The above steps were repeated until the CO2 concentration in the washed rich solution was higher than 1.5 mol / kg. After each rinsing and adsorption, titration was performed with 10 mol / L hydrochloric acid. After the reaction was complete, the generated CO2 gas was collected to calculate the CO2 adsorption amount and convert it to CO2 (mol) / [TEPA][2-MI] (kg). Specific data are shown in Table 2.

[0060] Table 2. CO2 adsorption amount in the absorbent solution for each round

[0061] Washing cycle <![CDATA[Rich liquid CO2 capture amount (mol / kg)]]> Rich liquid ① 0.26 Rich liquid ② 0.51 Rich liquid ③ 0.75 Rich liquid ④ 0.91 Rich liquid ⑤ 1.14 Rich liquid ⑥ 1.36 Rich liquid ⑦ 1.57

[0062] In summary, the CO2 capture device provided by this patent has good adsorption effect under different wind speeds, and the final rich solution concentration can be increased through cyclic washing for desorption, which has good economic benefits.

[0063] The contents described in this specification are merely an enumeration of the implementation forms of the inventive concept, and the scope of protection of this invention should not be regarded as limited to the specific forms described in the embodiments.

Claims

1. A barrel-shaped device for capturing low concentrations of carbon dioxide in the air, characterized in that... The device includes a barrel-shaped shell and a solar power supply system installed on the barrel-shaped shell. A fan (2) is installed on the upper side of the barrel-shaped shell and a vent (5) is installed on the lower side. A carbon dioxide absorption structure is also installed inside the barrel-shaped shell. The carbon dioxide absorption structure includes a vertical support column and multiple absorption modules (8) evenly spaced along the circumference on the side of the support column. The absorption module (8) includes a plate-shaped adsorption fiber (15) and its fixing frame. The adsorption fiber (15) has a liquid film formed by being wetted with carbon dioxide absorption liquid.

2. The barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 1, characterized in that... The solar power supply system includes a solar panel (1) installed on the top of the barrel-shaped shell and a storage battery installed inside the barrel-shaped shell. The solar panel (1) is electrically connected to the storage battery, and the storage battery supplies power to each power-consuming unit of the system.

3. The barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 1, characterized in that... The fixed frame of the absorption module (8) includes two stainless steel mesh sheets (17) and two fixed steel sheets (16). The adsorption fiber (15) is sandwiched between the two stainless steel mesh sheets (17). The two stainless steel mesh sheets (17) are then clamped and fixed by two fixed steel sheets (16) on their outer sides. The two fixed steel sheets (16) are fixed together by bolts.

4. The barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 1, characterized in that... The barrel-shaped shell is also equipped with an absorbent liquid storage tank, a cleaning liquid storage tank (12) and an infusion pump. Multiple liquid dispensing pipes (7) are evenly spaced along the circumference on the upper side of the support column. The liquid dispensing pipes (7) correspond one-to-one with the absorption modules (8) and the number of both is the same. A liquid dispensing pipe (7) is set above the absorption module (8). Several drip holes are spaced along the length of the bottom of the liquid dispensing pipe (7). The drip holes are located directly above the adsorption fibers (15) of the corresponding absorption module (8). The inlet of the infusion pump is divided into two paths, which are respectively connected to the absorption liquid storage tank and the cleaning liquid storage tank (12) by pipelines, and the outlet of the infusion pump is connected to each of the liquid dispensing drip tubes (7); The barrel-shaped shell is also provided with a drip recovery structure, which is located below each of the absorption modules (8) and is used to collect the solution dripping from the absorption module (8); the outlet of the drip recovery structure is further divided into two paths, which are connected to the absorption liquid storage tank and the cleaning liquid storage tank (12) by pipelines respectively. Control valves are installed on all the corresponding pipelines.

5. A barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 4, characterized in that... A PLC central control module (4) is provided on the barrel-shaped shell. The PLC central control module (4) is connected to the infusion pump via signal, and the operation of the infusion pump is controlled by the PLC central control module.

6. A barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 4, characterized in that... The support column has a hollow structure inside. A support fixing seat is set at the bottom of the support column. A main infusion pipe is installed inside the support column. The lower inlet of the main infusion pipe passes through the lower side of the support column and is connected to the outlet of the infusion pump by a pipeline. The upper outlet of the main infusion pipe passes through the upper end of the support column and is connected to multiple pipeline branches. The number of pipeline branches corresponds to the number of liquid dispensing drip tubes (7), and the two are connected one-to-one. The two ends of the liquid dispensing tube (7) are sealed, and one end is fixedly installed on the upper side of the support column.

7. A barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 4, characterized in that... The droplet recovery structure includes an annular collection tank (10) and multiple liquid return tanks (9). The liquid return tanks (9) correspond one-to-one with the absorption modules (8) and the number of both is the same. A liquid return tank (9) is set below the absorption module (8). The liquid return tank (9) is located directly below the adsorption fiber (15) of the corresponding absorption module (8). One end of the liquid reflux tank (9) is fixedly installed on the lower side of the support column; The annular liquid collection tank (10) is fixedly installed on the outer side of the support column and located below the liquid return tank (9); each liquid return tank (9) is inclined toward the annular liquid collection tank (10) and connected to the annular liquid collection tank (10) through a liquid outlet pipe. The bottom of the annular liquid collection tank (10) is provided with a tank liquid outlet (11), which is divided into two paths and connected to the absorption liquid storage tank and the cleaning liquid storage tank (12) by pipelines respectively.

8. A barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 1, characterized in that... Multiple fans (2) are arranged at even intervals along the circumference on the upper side of the barrel-shaped shell.

9. A barrel-shaped device for capturing low concentrations of carbon dioxide in the air as described in claim 1, characterized in that... An observation window (3) is provided on the side wall of the barrel-shaped shell.

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