Absorption tower

Abstract

The invention provides an absorption tower, which comprises: a tower body in which an absorption section is arranged; the first gas inlet is formed in the bottom of the tower body; the gas outlet is formed in the top of the tower body; the air inlet pipe comprises a main pipe body and a branch pipe, the main pipe body is communicated with the first air inlet, the first end of the branch pipe is connected with the main pipe, and the second end of the branch pipe is connected with the tower body and corresponds to the absorption section. And the gas enters the main pipe body, then is shunted to the branch pipe and is arranged corresponding to the absorption section through the second end of the branch pipe. According to the technical scheme of the invention, the problem of non-uniform distribution of gas and liquid phases in the filler layer in related technologies is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry and environmental protection, and in particular to an absorption tower. Background Art

[0002] At present, the liquid in the absorption tower is added from the top of the tower, sprayed onto the packing through the liquid distributor, and flows down along the gaps in the packing. The gas is sent in from the bottom of the tower, distributed by the gas distribution device, and continuously passes through the gaps in the packing layer in countercurrent with the liquid, and the gas and liquid are in close contact for mass transfer. When the liquid flows down along the packing layer, it tends to gradually concentrate on the tower wall, causing the liquid flow near the tower wall to gradually increase. This phenomenon is called the wall flow effect. The wall flow effect causes the gas and liquid phases to be unevenly distributed in the packing layer, thereby reducing the mass transfer efficiency and affecting the quality of the finished product. Summary of the invention

[0003] The main purpose of the present invention is to provide a method for solving the problem of uneven distribution of gas-liquid two phases in a packing layer due to wall flow phenomenon in the related art.

[0004] In order to achieve the above-mentioned purpose, the present invention provides an absorption tower, comprising: a tower body, in which an absorption section is arranged; a first air inlet is arranged at the bottom of the tower body; an air outlet is arranged at the top of the tower body; an air inlet pipe, comprising a main body and a branch pipe, the main body is connected to the first air inlet, the first end of the branch pipe is connected to the main body, and the second end of the branch pipe is connected to the tower body and is arranged corresponding to the absorption section.

[0005] Furthermore, a plurality of second air inlets are arranged on the circumference of the tower body, the plurality of second air inlets are arranged corresponding to the absorption sections, and the second end of the branch pipe is connected to the plurality of second air inlets.

[0006] Furthermore, a plurality of second air inlets are arranged in an array to form a plurality of hole groups, and the plurality of hole groups are spaced apart along the height direction of the tower body, and each hole group includes a plurality of second air inlets, wherein the difference in the number of second air inlets in two adjacent hole groups is 1.

[0007] Furthermore, the branch pipe includes a pipe section and a surrounding portion, the surrounding portion is arranged outside the tower body and corresponds to the absorption section, a containing cavity is formed between the surrounding portion and the tower body, and the second air inlet communicates the containing cavity and the interior of the tower body.

[0008] Furthermore, the diameter a of the main pipe body and the diameter b of the pipe section satisfy: 2.5≤a / b≤4.

[0009] Furthermore, a first liquid inlet is provided on the side wall of the tower body, and the first liquid inlet is located above the absorption section.

[0010] Furthermore, the absorption tower also includes a gas distributor, which is arranged at the bottom of the tower body and connected to the first air inlet. The height of the gas distributor gradually decreases from close to the first air inlet to away from the first air inlet.

[0011] Furthermore, the absorption tower also includes a first collector, which is arranged inside the tower body and below the absorption section, and includes a first filter membrane.

[0012] Furthermore, the absorption tower also includes a second liquid inlet and a second collector, the second liquid inlet is arranged at the top of the tower body, the second collector is located below the second liquid inlet and above the first liquid inlet, and the second collector includes a second filter membrane.

[0013] Furthermore, the absorption tower also includes a packing structure, which is arranged inside the absorption tower and located at the absorption section.

[0014] According to the technical solution of the present invention, the tower body is provided with an absorption section inside; the first air inlet is provided at the bottom of the tower body; the air outlet is provided at the top of the tower body; the air inlet pipe includes a main body and a branch pipe, the main body is connected to the first air inlet, the first end of the branch pipe is connected to the main body, the second end of the branch pipe is connected to the tower body and is provided corresponding to the absorption section. By providing the absorption section in the tower body, the internal filler and the gas-liquid can be brought into contact, so that the components in the gas are absorbed by the liquid, and the gas is evenly distributed to various positions of the absorption section inside the tower body by providing the branch pipe of the air inlet pipe, ensuring that the gas is evenly contacted with the absorption liquid in the absorption section and cooperates with the first air inlet to introduce the gas to be treated and the air outlet to discharge the treated gas. Therefore, the technical solution of the present application effectively solves the problem of uneven distribution of gas-liquid phases in the filler layer in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of an absorption tower according to the present invention is shown;

[0017] Figure 2 Shows Figure 1 A schematic cross-sectional view of an absorption tower;

[0018] Figure 3 Shows Figure 1 Schematic diagram of the decomposed structure of the absorption tower;

[0019] Figure 4 Shows Figure 1A schematic diagram of the three-dimensional structure of a gas distributor of an absorption tower;

[0020] Figure 5 Shows Figure 4 Schematic cross-sectional view of a gas distributor.

[0021] The above drawings include the following reference numerals:

[0022] 10. Tower body; 11. Absorption section; 12. Second air inlet; 13. First liquid inlet; 20. First air inlet; 30. Air outlet; 40. Air inlet pipe; 41. Main body; 42. Branch pipe; 421. Pipe section; 422. Surrounding part; 423. Accommodating chamber; 50. Gas distributor; 61. First collector; 62. Second liquid inlet; 63. Second collector; 64. Packing structure. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0026] like Figures 1 to 3 As shown, in this embodiment, in order to achieve the above-mentioned purpose, the present invention provides an absorption tower including: a tower body 10, in which an absorption section 11 is arranged; a first air inlet 20, which is arranged at the bottom of the tower body 10; an air outlet 30, which is arranged at the top of the tower body 10; an air inlet pipe 40, including a main body 41 and a branch pipe 42, the main body 41 is connected to the first air inlet 20, the first end of the branch pipe 42 is connected to the main body 41, and the second end of the branch pipe 42 is connected to the tower body 10 and is arranged corresponding to the absorption section 11.

[0027] According to the technical solution of the present invention, an absorption section is arranged inside the tower body 10; the first air inlet 20 is arranged at the bottom of the tower body 10; the air outlet 30 is arranged at the top of the tower body 10; the air inlet pipe 40 includes a main body 41 and a branch pipe 42, the main body 41 is connected to the first air inlet 20, the first end of the branch pipe 42 is connected to the main body 41, and the second end of the branch pipe 42 is connected to the tower body 10 and arranged corresponding to the absorption section 11. By arranging the absorption section 11 inside the tower body 10, the internal filler and the gas-liquid can be contacted, so that the components in the gas are absorbed by the liquid, and the gas is evenly distributed to various positions of the absorption section 11 inside the tower body 10 by arranging the branch pipe 42 of the air inlet pipe 40, ensuring that the gas is evenly contacted with the absorption liquid in the absorption section 11 and cooperates with the first air inlet 20 to introduce the gas to be treated and the air outlet 30 to discharge the treated gas, so the technical solution of this embodiment effectively solves the problem of uneven distribution of gas-liquid two phases in the filler layer in the related art.

[0028] Specifically, this design can effectively increase the contact area between the gas and the absorbent, thereby enhancing the absorption effect. It is suitable for waste gas treatment in the chemical, electric power, metallurgical and other industries, especially when treating industrial waste gas containing a large amount of harmful gases. The effect is particularly significant. By implementing this design, the residence time of the gas in the absorption tower is extended, the capture efficiency of harmful gases is improved, the emission concentration is reduced, and the environmental pollution problem is effectively alleviated. It is particularly advantageous in applications in industrially intensive areas such as chemical parks, large power plants and steel mills.

[0029] like Figures 1 to 3 As shown, in this embodiment, a plurality of second air inlets 12 are provided in the circumferential direction of the tower body 10, the plurality of second air inlets 12 are provided corresponding to the absorption section 11, and the second end of the branch pipe 42 is connected to the plurality of second air inlets 12. By providing a plurality of second air inlets 12 and corresponding to the absorption section 11, the gas can enter the absorption section 11 uniformly through the branch pipe 42 and the second air inlet 12, thereby improving the contact efficiency between the gas and the liquid.

[0030] It should be noted that this multi-point air intake design (multiple second air inlets 12) can make the gas more evenly distributed throughout the absorption section 11, avoiding the problem of low absorption efficiency caused by uneven gas distribution during traditional single-point air intake, and is particularly suitable for treating high-concentration, high-flow waste gas, such as tail gas treatment in the petrochemical industry. In the petrochemical industry, this design can significantly improve the removal rate of harmful gases such as sulfur dioxide and nitrogen oxides in the tail gas, reducing the impact of production on the environment. At the same time, due to the more even distribution of gas, the operating stability of the absorption tower is improved, reducing maintenance costs and improving overall economic benefits.

[0031] like Figures 1 to 3 As shown, in this embodiment, a plurality of second air inlets 12 are arranged in an array to form a plurality of hole groups, and the plurality of hole groups are arranged at intervals along the height direction of the tower body 10, and each hole group includes a plurality of second air inlets 12, wherein the difference in the number of second air inlets 12 in two adjacent hole groups is 1. The plurality of second air inlets 12 are arranged in an array to form a plurality of hole groups, that is, the second air inlets 12 arranged at the same height are classified into the same hole group, and each hole group is arranged at intervals along the height direction of the tower body 10, to ensure that the gas enters the interior through the hole group and contacts the liquid uniformly, and because the width of the tower body 10 is different, the plurality of second air inlets 12 in each hole group are increased in sequence from narrow to wide in the tower body 10.

[0032] Specifically, this gradual multiple second air inlets 12 design can adjust the air intake according to the pressure changes during the gas rising process, ensure the uniform distribution of the gas in the absorption tower, and is suitable for treating waste gas with large pressure fluctuations, such as flue gas desulfurization and denitrification in the power industry. In the power industry, the fluctuation of flue gas pressure often leads to the performance degradation of traditional absorption towers, while the absorption tower of this solution can adjust the number of air inlets in real time according to the pressure changes, effectively stabilize the absorption process, and improve the efficiency and reliability of flue gas treatment. Especially in large power facilities such as coal-fired power plants and gas-fired power plants, it can significantly reduce harmful gas emissions and protect the atmospheric environment.

[0033] like Figures 1 to 3 As shown, in this embodiment, the branch pipe 42 includes a pipe section 421 and a surrounding portion 422. The surrounding portion 422 is arranged outside the tower body 10 and is arranged corresponding to the absorption section 11. A receiving cavity 423 is formed between the surrounding portion 422 and the tower body 10. The second air inlet 12 communicates with the receiving cavity 423 and the interior of the tower body 10. To ensure uniformity of gas distribution, the surrounding portion 422 is arranged outside the tower body 10 and is arranged corresponding to the absorption section 11. The internal arrangement ensures uniformity of gas. The gas is received in the receiving cavity 423 formed between the surrounding portion 422 and the tower body 10, and the gas distribution is more uniform with the cooperation of multiple hole groups.

[0034] Specifically, this structure can ensure that the gas is pre-distributed in the containing chamber 423 before entering the absorption section 11, thereby improving the contact efficiency between the gas and the absorbent, and is particularly suitable for occasions requiring high-efficiency absorption, such as the purification of harmful gases in the pharmaceutical industry. In the pharmaceutical industry, there are many types of harmful gases, and they often contain high concentrations of organic solvents.

[0035] The absorption tower of this scheme can design specific absorbents for different harmful gases. The contact area between the absorbent and the gas is increased by pre-distribution, which greatly improves the purification efficiency, ensures the cleanliness of the production environment, and also reduces the potential threat of harmful substances to the health of workers.

[0036] like Figures 1 to 3 As shown, in this embodiment, the diameter a of the main pipe body 41 and the diameter b of the pipe section 421 satisfy: 2.5≤a / b≤4. The setting of the main pipe and the pipe section 421 determines whether the gas can be evenly distributed after entering, so the diameters of the main pipe and the pipe section 421 need to be strictly set to make the gas flow rate and pressure distribution reasonable, and avoid the main pipe and the pipe section 421 being too large or too small, resulting in uneven gas distribution or operation problems caused by excessive flow rate.

[0037] It should be noted that by precisely controlling the diameter ratio of the main body 41 and the branch pipe 42, the gas flow can be optimized, the resistance can be reduced, and the processing capacity and energy efficiency of the absorption tower can be improved. It is suitable for various industrial waste gas treatment systems, such as acid gas purification in the steel industry. In the steel industry, the purification of acid gas is a major challenge in the production process. By adjusting the diameter ratio of the main body 41 and the branch pipe 42, the resistance of gas flow can be effectively reduced, the processing capacity of the absorption tower can be improved, and energy consumption and production costs can be reduced at the same time, which has a significant effect on improving the environmental protection image and economic benefits of steel enterprises.

[0038] like Figures 1 to 3 As shown, in this embodiment, a first liquid inlet 13 is provided on the side wall of the tower body 10, and the first liquid inlet 13 is located above the absorption section 11. The liquid inlet is used to introduce absorption liquid, and the first liquid inlet 13 is arranged above the absorption section 11, so that the absorption liquid flows downward from the top of the tower and contacts with the gas rising below in countercurrent, thereby improving the absorption efficiency.

[0039] Specifically, this design enables the absorbent to be sprayed directly on the area where the gas flows, thereby enhancing the absorption effect, and is suitable for treating waste gas containing water-soluble harmful gases, such as waste gas treatment in the papermaking industry. In the papermaking industry, waste gas often contains a large amount of water-soluble harmful gases, such as hydrogen sulfide, ammonia, etc. These harmful gases can be effectively captured through the precise spraying of the first liquid inlet 13. At the same time, the position design of the first liquid inlet 13 can avoid waste of absorbent, improve resource utilization, and reduce operating costs.

[0040] like Figure 1 , Figure 4 as well as Figure 5 As shown, in this embodiment, the absorption tower further includes a gas distributor 50, which is arranged at the bottom of the tower body 10 and communicated with the first liquid inlet 13, and the height of the gas distributor 50 gradually decreases from the direction close to the first liquid inlet 13 to the direction away from the first liquid inlet 13. The distributor is arranged at the bottom of the tower body 10 to evenly distribute the introduced gas, prevent the gas from generating eddy current or bias flow when entering the tower body 10, and improve the uniform contact of the gas in the absorption section 11.

[0041] Specifically, the design of the gas distributor 50 can form a uniform airflow distribution when the gas enters the tower body 10, avoiding the problem of insufficient absorption caused by excessive local airflow, and is particularly suitable for treating waste gas containing particulate matter, such as dust control in the cement industry. In the cement industry, the concentration of particulate matter in the waste gas is relatively high. Through the optimized design of the gas distributor 50, the gas flow can be made smoother, the deposition of particulate matter can be prevented, the maintenance frequency of the equipment can be reduced, and the absorption efficiency of harmful gases can be improved, which helps to improve the environmental friendliness of the cement plant and reduce the impact on the lives of surrounding residents.

[0042] like Figures 1 to 3 As shown, in this embodiment, the absorption tower further includes a first collector 61, which is arranged inside the tower body 10 and below the absorption section 11, and includes a first filter membrane. The first collector 61 is arranged below the absorption section 11 and is used to collect the absorption liquid. The filter membrane ensures that the absorption liquid does not contain impurities, thereby improving the absorption effect, and the filter membrane can only pass gas, but liquid cannot pass through the filter membrane.

[0043] Specifically, the first collector 61 can effectively collect and filter the residual harmful substances, protect the equipment, and extend the service life. It is suitable for treating waste gas containing high concentrations of harmful substances, such as organic waste gas treatment in the electronics industry. In the electronics industry, the waste gas contains a large amount of organic solvents. The setting of the first collector 61 can effectively block and capture these organic substances to prevent them from causing pollution and damage to subsequent equipment. At the same time, the design of the first filter membrane can be adjusted according to the composition of the waste gas, which improves the pertinence and filtration efficiency of the collector, ensures the continuous and stable operation of the electronics factory, and plays an important role in improving product quality and production safety.

[0044] like Figures 1 to 3 As shown, in this embodiment, the absorption tower also includes a second liquid inlet 62 and a second collector 63. The second liquid inlet 62 is arranged at the top of the tower body 10. The second collector 63 is located below the second liquid inlet 62 and above the first liquid inlet 13. The second collector 63 includes a second filter membrane.

[0045] Specifically, the second collector 63 can further purify the gas to ensure the cleanliness of the exhaust gas, and is suitable for occasions with strict emission standards, such as VOCs emission control in the pharmaceutical industry. In the pharmaceutical industry, the emission control of VOCs (volatile organic compounds) is extremely strict. The setting of the second collector 63 can perform secondary purification on the gas to ensure that the VOCs concentration of the exhaust gas is lower than the national standard, avoiding environmental fines. At the same time, the selection of the second filter membrane can be optimized according to the type of VOCs, thereby improving the purification efficiency.

[0046] like Figures 1 to 3 As shown, in this embodiment, the absorption tower further includes a packing structure 64, which is arranged inside the absorption tower and located at the absorption section 11. The packing structure 64 is arranged in the absorption section 11 to provide a surface area for gas-liquid contact and promote the absorption of components in the gas by the liquid.

[0047] Specifically, the packing structure 64 can increase the contact area between the gas and the absorbent, improve the absorption efficiency, and at the same time, the selection and design of the packing can be optimized for different waste gas components, and is suitable for various industrial waste gas treatments, such as petrochemical, electric power, metallurgy, pharmaceutical, cement and other industries, and can effectively reduce harmful gas emissions, protect the environment, and meet the requirements of green production. Through the customized design of the packing structure 64, the absorption tower can select the most suitable packing type and structure according to the waste gas characteristics of a specific industry, such as using activated carbon packing in the petrochemical industry and limestone packing in the electric power industry, which effectively improves the treatment efficiency and adaptability of the absorption tower, reduces the pollution of harmful gases to the atmosphere, and has positive significance for promoting green production and achieving sustainable development goals.

[0048] like Figures 1 to 3 As shown, in this embodiment, the flue gas is diverted to form a first diversion pipeline, a second diversion pipeline and a main pipeline. The main pipeline enters from the bottom of the tower, and the first diversion pipe and the second diversion pipe enter from both sides of the tower body 10 to the interior of the tower body 10 respectively, and are located at both ends of the packing structure 64, that is, the flue gas is blown in directly, so that the wall flow phenomenon can be avoided at the packing structure 64 of the tower body 10.

[0049] Specifically, by evenly distributing the flue gas, the gas-liquid contact area is maximized, thereby improving the removal efficiency of pollutants. Specially designed diversion pipes and distributors reduce the unevenness of gas flow, reduce system pressure drop, and improve overall performance. Reducing wall flow phenomenon helps reduce unnecessary energy consumption in system operation because the gas flow is smoother and pressure loss is reduced. Enhanced system stability: Uniform flue gas distribution reduces excessive loads in local areas, thereby enhancing the long-term stability and reliability of the system. Avoiding uneven corrosion and wear caused by wall flow phenomenon helps to extend the service life of the absorption tower and related equipment components.

[0050] The technical solution of this embodiment can make the gas more evenly distributed when entering the absorption tower by setting the absorption section 11 in the tower body 10 and adopting the air intake structure of the main body 41 and the branch pipe 42, thereby improving the absorption efficiency. At the same time, by adjusting the diameter ratio of the main body 41 and the branch pipe 42, the gas flow can be optimized, the resistance can be reduced, and the absorption effect can be further improved. In addition, the gas distributor 50, the first collector 61 and the second collector 63 can effectively filter and collect residual substances, protect the equipment, and extend the service life. The overall design improves the operating efficiency and safety of the absorption tower, which has significant benefits for environmental protection and industrial production.

[0051] In general, the absorption tower of this scheme can significantly improve the absorption efficiency, reduce equipment resistance, and extend the service life by optimizing the air intake structure, gas distribution, absorbent spraying, collector design, and packing structure 64. It is suitable for various industrial waste gas treatments, especially when treating waste gas with high concentration, high flow, and large pressure fluctuations. At the same time, its design is highly flexible and can be customized according to the characteristics of waste gas in different industries to meet strict environmental emission standards, which is of great significance to promoting industrial green transformation and protecting the ecological environment.

[0052] In addition, through reasonable design, the absorption tower can also reduce operating costs and improve economic benefits, which is an important innovation in the field of industrial waste gas treatment. This innovative design can not only reduce the initial investment and operating costs of environmental protection facilities for enterprises, but also improve waste gas treatment efficiency and reduce energy consumption, creating more green economic benefits for enterprises, and also making positive contributions to achieving global environmental governance goals.

[0053] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An absorption tower, characterized in that: include: A tower body (10), wherein an absorption section (11) is arranged in the tower body (10); A first air inlet (20) is arranged at the bottom of the tower body (10); An air outlet (30) is arranged at the top of the tower body (10); An air inlet pipe (40) comprises a main body (41) and a branch pipe (42), wherein the main body (41) is in communication with the first air inlet (20), a first end of the branch pipe (42) is connected to the main body (41), and a second end of the branch pipe (42) is connected to the tower body (10) and is arranged corresponding to the absorption section (11).

2. The absorption tower according to claim 1, characterized in that A plurality of second air inlets (12) are arranged on the circumference of the tower body (10), the plurality of second air inlets (12) are arranged corresponding to the absorption section (11), and the second end of the branch pipe (42) is connected to the plurality of second air inlets (12).

3. The absorption tower according to claim 2, characterized in that A plurality of the second air inlets (12) are arranged in an array to form a plurality of hole groups, wherein the plurality of hole groups are spaced apart along the height direction of the tower body (10), and each of the hole groups comprises a plurality of the second air inlets (12), wherein the difference in the number of the second air inlets (12) in two adjacent hole groups is 1.

4. The absorption tower according to claim 2, characterized in that The branch pipe (42) comprises a pipe section (421) and a surrounding portion (422); the surrounding portion (422) is arranged on the outside of the tower body (10) and is arranged corresponding to the absorption section (11); a accommodating chamber (423) is formed between the surrounding portion (422) and the tower body (10); and the second air inlet (12) is connected to the accommodating chamber (423) and the interior of the tower body (10).

5. The absorption tower according to claim 4, characterized in that The diameter a of the main pipe (41) and the diameter b of the pipe section (421) satisfy the following relationship: 2.5≤a / b≤4.

6. The absorption tower according to claim 1, characterized in that: A first liquid inlet (13) is provided on the side wall of the tower body (10), and the first liquid inlet (13) is located above the absorption section (11).

7. The absorption tower according to claim 1, characterized in that The absorption tower further comprises a gas distributor (50), which is arranged at the bottom of the tower body (10) and is connected to the first air inlet (20), and the height of the gas distributor (50) gradually decreases in a direction from close to the first air inlet (20) to far away from the first air inlet (20).

8. The absorption tower according to claim 1, characterized in that The absorption tower further comprises a first collector (61), which is arranged inside the tower body (10) and below the absorption section (11), and the first collector (61) comprises a first filter membrane.

9. The absorption tower according to claim 6, characterized in that The absorption tower further comprises a second liquid inlet (62) and a second collector (63), wherein the second liquid inlet (62) is arranged at the top of the tower body (10), the second collector (63) is located below the second liquid inlet (62) and above the first liquid inlet (13), and the second collector (63) comprises a second filter membrane.

10. The absorption tower according to claim 1, characterized in that The absorption tower further comprises a packing structure (64), wherein the packing structure (64) is arranged inside the absorption tower and located at the absorption section (11).

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