Gas recovery tower

Abstract

The invention relates to a gas recovery tower which comprises an absorption tower, a desorption tower, a liquid spraying assembly, a pump, a dispersion mechanism and a blocking mechanism, the upper side and the lower side of the absorption tower are connected with a gas inlet pipe and a gas outlet pipe, and the dispersion mechanism comprises a cover body which is arranged below the liquid spraying assembly and arranged above the output end of the gas inlet pipe in a blocking mode; the blocking mechanism comprises a blocking assembly which is arranged in the absorption tower and can be periodically opened and closed and a driving assembly for driving the blocking assembly to be periodically opened and closed. By arranging the blocking assembly, to-be-treated gas in the absorption tower can be blocked, the gas rising speed can be slowed down, and the retention time of the gas in the absorption tower can be prolonged, so that the gas can fully react with reaction chemicals sprayed out by the liquid spraying assembly, and the gas treatment effect is ensured; the cover body is additionally arranged in the absorption tower, so that reaction chemicals can be effectively prevented from entering the gas inlet pipe to block the gas inlet pipe, and meanwhile, to-be-treated gas entering the absorption tower can be more uniformly dispersed in the absorption tower.

Description

Technical Field

[0001] The invention relates to the technical field of gas recovery, and in particular to a gas recovery tower. Background Art

[0002] There are many methods for recovering carbon dioxide, and the most common and practical method is to use chemical agents for recovery. It mainly includes first allowing the raw gas to react chemically with a reaction drug such as ethanolamine solution, so that the reaction drug absorbs carbon dioxide to become a rich liquid. The rich liquid is then collected and heated to decompose, and the carbon dioxide is desorbed, thereby completing the purpose of separating and absorbing carbon dioxide.

[0003] The existing carbon dioxide recovery tower mainly includes an absorption tower and a desorption tower, see patent CN 220071233 U. The gas to be recovered is introduced from the bottom of the absorption tower, and a nozzle is installed near the top of the absorption tower. The ethanolamine solution is sprayed out through the nozzle to contact the gas and react with the carbon dioxide in the gas by utilizing the rising of the recovered gas. The ethanolamine solution that absorbs the carbon dioxide is finally gathered at the bottom of the inner cavity of the absorption tower, and flows into the desorption tower through the reflux pipe for further desorption, separation and recovery. The other recovered gas is discharged from the waste gas recovery pipe at the top of the absorption tower.

[0004] However, since the rising speed of the gas to be recovered is difficult to control during its rise in the absorption tower, it is easy for some of the gas to fail to fully contact the ethanolamine solution due to the excessively fast rising speed of the gas, resulting in incomplete gas treatment and, in turn, poor carbon dioxide recovery. In addition, the ethanolamine solution sprayed from the nozzle also has the risk of entering the exhaust hole of the intake pipe, which is easy to cause the exhaust hole to be blocked and affect the intake of the intake pipe. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a gas recovery tower with better recovery effect.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A gas recovery tower, comprising an absorption tower, a desorption tower, a reflux pipe for connecting the absorption tower and the desorption tower, a liquid spraying assembly installed in the absorption tower, and a pump, wherein the input end of the pump extends into the desorption tower and the output end is connected to the liquid spraying assembly, and is used to transport the reactant after desorption in the desorption tower to the liquid spraying assembly and spray it out by the liquid spraying assembly, the upper and lower sides of the absorption tower are respectively connected with an air inlet pipe and an air outlet pipe, the gas recovery tower also includes a dispersion mechanism and a blocking mechanism, the dispersion mechanism includes a cover body arranged below the liquid spraying assembly, the cover body The barrier is arranged above the output end of the air inlet pipe and has a gap between its circumference and the inner wall of the absorption tower; the blocking mechanism includes a blocking component which is arranged in the absorption tower and can be opened and closed periodically, and a driving component for driving the blocking component to open and close periodically. When the blocking component is in a closed state, the blocking component separates the upper and lower sides of the absorption tower into an upper part and a lower part which are not connected to each other, so as to intercept the gas in the lower part; when the blocking component is in an open state, the upper part and the lower part are connected, and the blocking component allows the gas in the lower part to pass through.

[0008] The present application utilizes a driving component to drive the barrier component to realize periodic opening and closing. When the barrier component is closed, the barrier component intercepts the gas to be treated rising in the absorption tower. Due to the obstruction of the barrier component, the gas is trapped in the lower part, and the rising speed of the gas is correspondingly slowed down. The residence time in the absorption tower is prolonged, and the contact time with the reaction drug is prolonged. The gas can fully react with the reaction drug, and the recovery effect is better. When the barrier component is switched from closed to open, the target gas in the gas to be treated has been fully absorbed by the reaction drug, and the remaining gas can rise through the barrier component and be discharged from the outlet pipe.

[0009] The present application also sets up a cover body and utilizes the dispersing effect of the cover body to make the gas to be treated entering the absorption tower more evenly dispersed in the absorption tower, thereby ensuring the gas treatment effect; and the cover body also forms a barrier to the reaction drugs to prevent the reaction drugs from falling into the intake pipe and affecting the intake of the intake pipe.

[0010] Preferably, the barrier assembly includes a first barrier plate fixedly installed in the absorption tower and matched with the inner wall of the absorption tower, and a second barrier plate rotatably arranged on the upper side or the lower side of the first barrier plate, the first barrier plate and the second barrier plate are fitted with each other and have through passages respectively opened thereon, when the barrier assembly is in a closed state, the relative ports of the passages of the first barrier plate and the second barrier plate are staggered to prevent gas from passing through; when the barrier assembly is in an open state, the relative ports of the passages of the second barrier plate and the first barrier plate have an overlapping area on the horizontal plane to allow gas to pass through, and when the second barrier plate is controlled to rotate by the driving assembly, the barrier assembly can switch between a closed state and an open state. The present application realizes the periodic opening and closing of the barrier assembly by driving the second barrier plate to rotate, and has a simple structure and convenient control.

[0011] Further preferably, the first blocking plate and the second blocking plate have the same number of channels, and when the blocking assembly is in an open state, the channels of the first blocking plate and the second blocking plate overlap in a one-to-one correspondence.

[0012] In some embodiments, the first baffle plate and the second baffle plate have 2 to 6 channels, preferably 3 to 5 channels.

[0013] In some embodiments, the channels of the first baffle plate and the second baffle plate extend along the height direction of the absorption tower.

[0014] In some embodiments, the first blocking plate and the second blocking plate are coaxial and the multiple channels of the two are evenly arranged around the axis.

[0015] Preferably, the driving assembly includes a motor, a driving wheel fixedly mounted on the output shaft of the motor, and a driven wheel meshed with the driving wheel, the driven wheel is fixedly connected to the second blocking plate and controlled by the motor, and the driving wheel drives the driven wheel to rotate with the second blocking plate.

[0016] Preferably, the blocking mechanism further comprises a blocking member rotatably arranged in the absorption tower, which is controlled by the driving assembly, and the blocking member can reciprocally block the outlet pipe. The blocking member reciprocally blocks the outlet pipe, slowing down the speed of gas discharge from the absorption tower, thereby further increasing the residence time of the gas in the absorption tower, and making the reaction between the reaction drug and the gas more complete.

[0017] Further preferably, the blocking member has a plurality of blades arranged around its rotation axis, and when the blocking member blocks the air outlet pipe, one of the plurality of blades is blocked at the air inlet end of the air outlet pipe and prevents gas from entering.

[0018] In some embodiments, the number of the blades is 2 to 4.

[0019] Preferably, the blocking member is fixedly connected to the output shaft of the motor and is coaxial with the output shaft, and the blocking member and the blocking assembly share a motor.

[0020] Preferably, the cover body has a middle portion and a peripheral side portion, the middle portion is horizontal, and the peripheral side portion extends downwardly from the inside to the outside.

[0021] Preferably, the cover body is spaced apart from the output end of the air inlet pipe.

[0022] In some embodiments, the dispersion mechanism further includes a connecting rod connected between the cover body and the air inlet end of the air inlet pipe, and the connecting rod has a plurality of connecting rods arranged at intervals.

[0023] Preferably, the liquid spray assembly includes two groups of nozzle groups and connecting pipes for connecting the two groups of nozzle groups, each group of nozzle groups includes an annular pipe installed on the inner wall of the absorption tower and a plurality of nozzles distributed on the annular pipe, the output end of the pump is connected to the connecting pipe, and the barrier assembly is arranged between the two groups of nozzle groups.

[0024] Preferably, the output end of the air inlet pipe extends vertically into the absorption tower.

[0025] Preferably, the air inlet end of the air outlet pipe extends vertically into the absorption tower.

[0026] Preferably, the reflux pipe is installed at the bottom of the absorption tower and the analysis tower.

[0027] Preferably, a stirring device and a heating device are provided in the analytical tower, and the stirring device and the heating device can refer to the prior art.

[0028] Preferably, a gas recovery pipe is connected to the analytical tower.

[0029] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0030] The barrier component of the present application can be opened and closed periodically under the driving action of the driving component. When the barrier component is closed, the barrier component will intercept the gas to be treated in the absorption tower, the gas rise is blocked, the rising speed is slowed down, and the residence time in the absorption tower is prolonged, so that it can fully react with the reaction drug sprayed by the spray component. When the barrier component is switched from closed to open, the target gas in the gas to be treated has been fully absorbed by the reaction drug, and the remaining gas can rise through the barrier component and be discharged from the gas outlet pipe;

[0031] The present application also adds a cover body in the absorption tower, which can effectively prevent the reaction drugs from entering the air inlet pipe and blocking the air inlet pipe, and at the same time, the gas to be treated entering the absorption tower can be more evenly dispersed in the absorption tower, thereby ensuring the gas treatment effect;

[0032] The gas recovery tower of the present application has a simple structure and is easy to use, and is particularly suitable for the recovery and treatment of carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the gas recovery tower of Example 1;

[0034] Figure 2 is a cross-sectional view of the absorption tower of Example 1;

[0035] Figure 3 is a schematic structural diagram of the arresting mechanism of Example 1;

[0036] Figure 4 It is a structural schematic diagram of the dispersion mechanism and the air intake pipe of Example 1;

[0037] Figure 5 It is a schematic structural diagram of the liquid spraying assembly of Example 1;

[0038] Among them, 1. absorption tower; 11. air inlet pipe; 12. air outlet pipe;

[0039] 2. Analysis tower;

[0040] 3. blocking mechanism; 31. motor; 32. output shaft; 33. first blocking plate; 331. first channel; 34. second blocking plate; 341. second channel; 35. driving wheel; 36. driven wheel; 361. rotating shaft; 37. blocking member;

[0041] 4. cover body; 41. connecting rod;

[0042] 5. liquid spraying assembly; 51. annular tube; 52. nozzle; 53. connecting tube;

[0043] 6. Pump; 61. Input end; 62. Output end;

[0044] 7. Reflux pipe. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the examples. However, the present invention is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to the different requirements of specific use, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in each embodiment of the present invention can be combined with each other as long as they do not conflict with each other.

[0046] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0047] In the description of the embodiments of the present invention, it should be understood that the descriptions of up and down, left and right, front and back, inside and outside, etc. in this document are based on Figure 1 The direction is defined.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0051] Example 1

[0052] A gas recovery tower, such as Figures 1 to 5 As shown, it includes an absorption tower 1, a desorption tower 2, a reflux pipe 7 for connecting the absorption tower 1 and the desorption tower 2, a liquid spraying component 5 installed in the absorption tower 1, and a pump 6.

[0053] The input end 61 of the pump 6 extends into the analytical tower 2 and the output end 62 is connected to the liquid spraying assembly 5 , so as to transport the reactant drug after analysis in the analytical tower 2 to the liquid spraying assembly 5 and spray it out from the liquid spraying assembly 5 .

[0054] The liquid spraying assembly 5 includes a nozzle group, such as Figure 5 As shown, the nozzle group includes an annular tube 51 installed on the inner wall of the absorption tower 1 and a plurality of nozzles 52 evenly distributed on the annular tube 51. The nozzle group can be set as one or more groups according to actual needs. When there is only one group of nozzle groups, the output end 62 of the pump 6 can be directly connected to the annular tube 51 thereon; when there are multiple groups of nozzle groups, the liquid spraying assembly 5 also includes a connecting pipe 53 for connecting multiple groups of nozzle groups, and the output end 62 of the pump 6 is connected to the connecting pipe 53, and liquid is supplied to the annular tube 51 through the connecting pipe 53. In this embodiment, the nozzle group has two groups, one of which is located at the upper part of the absorption tower 1, and the other is located in the middle part of the absorption tower 1. The two groups of nozzle groups are connected through a U-shaped connecting pipe 53.

[0055] The upper and lower sides of the absorption tower 1 are respectively connected with an inlet pipe 11 and an outlet pipe 12. Preferably, the output end of the inlet pipe vertically extends into the absorption tower 1 and is located in the middle of the bottom of the inner cavity of the absorption tower 1; the inlet end of the outlet pipe vertically extends into the absorption tower 1, and its specific position is not limited. In this embodiment, it is located in the middle of the top of the inner cavity of the absorption tower 1. The gas to be treated enters the absorption tower 1 through the inlet pipe 11, and the treated gas can be discharged through the outlet pipe 12.

[0056] As a major improvement of the present application, the gas recovery tower further includes a dispersion mechanism and a barrier mechanism 3 .

[0057] The dispersion mechanism includes a cover body 4 disposed below the liquid spray assembly 5. The cover body 4 is disposed above the output end of the air inlet pipe, and the cover body 4 is spaced apart from the output end of the air inlet pipe to facilitate the gas to pass through the air inlet pipe 11. There is a gap between the circumference of the cover body 4 and the inner wall of the absorption tower 1 for the gas or the reaction drug sprayed by the liquid spray assembly 5 to pass through. The setting of the cover body 4 can, on the one hand, make the gas to be treated entering the absorption tower 1 more evenly dispersed in the absorption tower 1 to ensure the treatment effect of the gas; on the other hand, the cover body 4 also forms a barrier to the reaction drug sprayed by the liquid spray assembly 5, preventing the reaction drug from entering the air inlet pipe 11 and affecting the air intake of the air inlet pipe 11.

[0058] Furthermore, if Figure 4As shown, the cover body 4 has a horizontally arranged middle portion and a peripheral side portion extending downwardly obliquely from the inside to the outside. The reaction drug sprayed by the liquid spraying assembly 5 can slide downward along the extension direction of the peripheral side portion and fall into the bottom of the absorption tower 1 through the gap without forming liquid accumulation. The cover body 4 can be optionally connected to the inner wall of the absorption tower 1 or to the output end of the air inlet pipe. In this embodiment, the cover body 4 is connected to the output end of the air inlet pipe. Specifically, the dispersion mechanism also includes a connecting rod 41 connected between the input ends of the cover body air inlet pipe, and the connecting rod 41 has a plurality of spaced-apart arrangements.

[0059] The blocking mechanism 3 includes a blocking component that is arranged in the absorption tower 1 and can be opened and closed periodically, and a driving component for driving the blocking component to open and close periodically. When the blocking component is in a closed state, the blocking component separates the upper and lower sides of the absorption tower 1 into an upper part and a lower part that are not connected to each other, so as to intercept the gas in the lower part; when the blocking component is in an open state, the upper part and the lower part are connected, and the blocking component allows the gas in the lower part to pass. After the gas to be treated is passed into the absorption tower 1, it usually moves upward. The blocking component intercepts the gas to be treated in the absorption tower 1, so that the gas is blocked from rising, the gas rising speed is slowed down, and the gas stays in the absorption tower 1 for a longer time, so that it can fully react with the reaction drug sprayed by the liquid spray component 5, ensuring that the target gas is fully absorbed by the reaction drug. In this embodiment, the target gas is carbon dioxide. Of course, in other embodiments, it can also be other gases. When the blocking assembly is switched from a closed state to an open state, the gas can pass through the blocking assembly and move upward. At this time, since the target gas in the gas to be treated has been fully absorbed by the reaction drug, the gas passing through basically does not contain the target gas and can be discharged from the gas outlet pipe 12. With the continuous intake of gas through the intake pipe 11, the incoming gas can be effectively treated under the periodic opening and closing of the blocking assembly, which is very convenient and has good sustainability.

[0060] Furthermore, if Figure 3As shown, the blocking assembly includes a first blocking plate 33 fixedly installed in the absorption tower 1 and matched with the inner wall of the absorption tower 1, and a second blocking plate 34 rotatably arranged on the upper side or the lower side of the first blocking plate 33. The matching mentioned here generally means that the shape and size of the first blocking plate 33 match the inner cavity of the absorption tower 1, that is, the circumference of the first blocking plate 33 fits with the inner cavity of the absorption tower 1. The first blocking plate 33 and the second blocking plate 34 fit with each other and are respectively provided with through channels. When the blocking assembly is in a closed state, the relative ports of the channels of the first blocking plate 33 and the second blocking plate 34 are staggered to form a barrier to the gas; when the blocking assembly is in an open state, the relative ports of the channels of the second blocking plate 34 and the first blocking plate 33 have an overlapping area on the horizontal plane to allow the gas to pass through. When the second blocking plate 34 rotates, the blocking assembly can switch between a closed state and an open state. In this embodiment, the blocking assembly is located between the two groups of nozzle groups and is arranged adjacent to the nozzle group located below. The second blocking plate 34 is located above the first blocking plate 33. The channel thereon is the second channel 341, which vertically penetrates the second blocking plate 41. The channel on the first blocking plate 33 is the first channel 331, which vertically penetrates the first blocking plate 33. There are four first channels 331 and four second channels 341. When the blocking assembly is in the open state, the first channels 331 and the second channels 341 overlap one by one, so that the gas located below the first blocking plate 33 passes through. The blocking assembly is periodically opened and closed by rotating the second blocking plate 34, which has a simple structure and is easy to control.

[0061] The driving assembly includes a motor 31, a driving wheel 35 fixedly mounted on the output shaft 32 of the motor 31, and a driven wheel 36 meshed with the driving wheel 35. The driven wheel 36 is fixedly connected to the second blocking plate 34 via a rotating shaft 361 and is controlled by the motor 31. The driving wheel 35 drives the driven wheel 36 to rotate with the second blocking plate 34, thereby realizing the periodic opening and closing of the blocking assembly.

[0062] As another improvement of the present application, the blocking mechanism 3 also includes a blocking member 37 rotatably disposed in the absorption tower 1. Controlled by a driving assembly, the blocking member 37 can reciprocatingly block the gas outlet pipe 12, thereby slowing down the speed at which the gas is discharged from the absorption tower 1, further increasing the residence time of the gas in the absorption tower 1, and making the reaction between the reactant and the gas more complete.

[0063] Furthermore, the blocking member 37 has a plurality of blades arranged around its rotation axis (i.e., the axis of the output shaft 32 of the motor 31, that is, the blocking member 37 and the blocking mechanism 3 share a motor 31). When the blocking member 37 blocks the outlet pipe 12, one of the plurality of blades is disposed at the air inlet end of the outlet pipe 12 and blocks the entry of gas. In this embodiment, there are three blades.

[0064] The analytical tower 2 is provided with a stirring device and a heating device (not shown in the figure), and the specifics can be referred to the prior art, and this application is not limited. The analytical tower 2 is connected to a gas recovery pipe, and the target gas after being analyzed by the analytical tower 2 can be discharged through the gas recovery pipe (not shown in the figure).

[0065] Working principle:

[0066] Taking carbon dioxide recovery as a specific example, when the carbon dioxide in the treated gas is recovered, the gas is first transported to the absorption tower 1 by using the air inlet pipe 11. When the gas flows out from the output end of the air inlet pipe, it will impact on the cover body 4. The cover body 4 disperses the gas so that the gas flows upward from multiple directions along the circumference of the cover body 4. During the upward flow of the gas, the pump 6 is started, and the ethanolamine solution (reaction drug) after analysis in the analysis tower 2 is sent from the output end 62 of the pump 6 to the U-shaped connecting pipe 53 through the input end 61 of the pump 6, and finally sprayed from multiple nozzles 52 through the annular pipe 51, covering the entire cross-section of the absorption tower 1. The ethanolamine solution naturally falls under the action of gravity and is fully and evenly in contact with the gas in the absorption tower 1, and the carbon dioxide in the gas will come into contact with the ethanolamine solution to produce a chemical reaction and be absorbed.

[0067] Since the blocking assembly separates the absorption tower 1 into two upper and lower chambers (i.e., the upper part and the lower part), under the drive of the motor 31, the output shaft 32 of the motor 31 drives the driving wheel 35 to rotate. During the rotation of the driving wheel 35, the second blocking plate 34 is driven to rotate by utilizing the mutual meshing transmission effect of the driving wheel 35 and the driven wheel 36, so that the second channel 341 on the second blocking plate 34 and the first channel 331 on the first blocking plate 33 are reciprocatingly combined and staggered, thereby slowing down the rising speed of the gas in the absorption tower 1, extending the residence time of the gas in the absorption tower 1, and ensuring that the carbon dioxide in the gas is fully absorbed.

[0068] After the carbon dioxide in the gas is absorbed, the remaining other gases can pass through the barrier assembly and finally be discharged from the outlet pipe 12 when the barrier assembly is opened. Since the output shaft 32 of the motor 31 will drive the sealing member 37 to rotate, the outlet pipe 12 will be reciprocatedly blocked, thereby slowing down the speed of gas discharge from the absorption tower 1 and further increasing the residence time of the gas in the absorption tower 1.

[0069] After absorbing carbon dioxide, the ethanolamine solution will eventually gather at the bottom of the inner cavity of the absorption tower 1, and then flow into the inner cavity of the analysis tower 2 through the reflux pipe 7. At this time, the stirring device is started to increase the activity frequency of the ethanolamine solution after absorbing carbon dioxide in the analysis tower 2, and the heating device (such as a resistance ring, etc.) is started to heat the ethanolamine solution after absorbing carbon dioxide to release carbon dioxide. Finally, the carbon dioxide is discharged from the gas recovery pipe, and the ethanolamine solution after releasing carbon dioxide will be driven by the stirring device into the liquid extraction area in the analysis tower 2, and extracted by the pump 6 to participate in the next absorption operation.

[0070] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas recovery tower, comprising an absorption tower (1), a desorption tower (2), a reflux pipe (7) for connecting the absorption tower (1) and the desorption tower (2), a liquid spraying assembly (5) and a pump (6) installed in the absorption tower (1), wherein the input end (61) of the pump (6) extends into the desorption tower (2) and the output end (62) is connected to the liquid spraying assembly (5), and is used to transport the reactant after desorption in the desorption tower (2) to the liquid spraying assembly (5) and spray it out by the liquid spraying assembly (5), and the upper and lower sides of the absorption tower (1) are respectively connected to an air inlet pipe (11) and an air outlet pipe (12), characterized in that: The gas recovery tower further comprises a dispersion mechanism and a blocking mechanism (3), wherein the dispersion mechanism comprises a cover body (4) arranged below the liquid spraying assembly (5), the cover body (4) being arranged above the output end of the air inlet pipe and having a gap between its peripheral side and the inner wall of the absorption tower (1); The blocking mechanism (3) comprises a blocking component which is arranged in the absorption tower (1) and can be opened and closed periodically, and a driving component for driving the blocking component to open and close periodically. When the blocking component is in a closed state, the blocking component separates the upper and lower sides of the absorption tower (1) into an upper part and a lower part which are not connected to each other, so as to intercept the gas in the lower part; when the blocking component is in an open state, the upper part and the lower part are connected, and the blocking component allows the gas in the lower part to pass through.

2. The gas recovery tower according to claim 1, characterized in that: The blocking assembly comprises a first blocking plate (33) fixedly mounted in the absorption tower (1) and matched with the inner wall of the absorption tower (1), and a second blocking plate (34) rotatably arranged on the upper side or the lower side of the first blocking plate (33). The first blocking plate (33) and the second blocking plate (34) are fitted with each other and are respectively provided with through passages. When the blocking assembly is in a closed state, the relative ports of the passages of the first blocking plate (33) and the second blocking plate (34) are staggered; when the blocking assembly is in an open state, the relative ports of the passages of the second blocking plate (34) and the first blocking plate (33) have an overlapping area on a horizontal plane. When the second blocking plate (34) is controlled to rotate by the driving assembly, the blocking assembly can be switched between a closed state and an open state.

3. The gas recovery tower according to claim 2, characterized in that: The first blocking plate (33) and the second blocking plate (34) have a plurality of channels of the same number, and when the blocking assembly is in an open state, the channels of the first blocking plate (33) and the second blocking plate (34) overlap one by one; and / or, The channels of the first baffle plate (33) and the second baffle plate (34) extend along the height direction of the absorption tower (1).

4. The gas recovery tower according to claim 2, characterized in that: The driving assembly comprises a motor (31), a driving wheel (35) fixedly mounted on an output shaft (32) of the motor (31), and a driven wheel (36) meshed with the driving wheel (35); the driven wheel (36) is fixedly connected to the second blocking plate (34) and is controlled by the motor (31); the driving wheel (35) drives the driven wheel (36) to rotate with the second blocking plate (34).

5. The gas recovery tower according to claim 1, characterized in that: The blocking mechanism (3) further comprises a blocking member (37) rotatably arranged in the absorption tower (1) and controlled by the driving assembly. The blocking member (37) can reciprocally block the outlet pipe (12).

6. The gas recovery tower according to claim 5, characterized in that: The blocking member (37) has a plurality of blades arranged around its rotation axis. When the blocking member (37) blocks the outlet pipe (12), one of the plurality of blades is disposed at the air inlet end of the outlet pipe (12) and prevents gas from entering.

7. The gas recovery tower according to claim 1, characterized in that: The cover body (4) comprises a middle portion and a peripheral side portion, the middle portion is horizontal, and the peripheral side portion extends downwardly from the inside to the outside; and / or, The cover body (4) is spaced apart from the output end of the air inlet pipe.

8. The gas recovery tower according to claim 1, characterized in that: The liquid spraying assembly (5) comprises two groups of nozzle groups and a connecting pipe (53) for connecting the two groups of nozzle groups, each group of nozzle groups comprises an annular pipe (51) installed on the inner wall of the absorption tower (1) and a plurality of nozzles (52) distributed on the annular pipe (51), the output end (62) of the pump (6) is connected to the connecting pipe (53), and the blocking assembly is arranged between the two groups of nozzle groups.

9. The gas recovery tower according to claim 1, characterized in that: The output end of the air inlet pipe vertically extends into the absorption tower (1); and / or, The air inlet end of the air outlet pipe (12) vertically extends into the absorption tower (1); and / or, The reflux pipe (7) is installed at the bottom of the absorption tower (1) and the analysis tower (2).

10. The gas recovery tower according to claim 1, characterized in that: The analytical tower (2) is provided with a stirring device and a heating device; and / or, The analytical tower (2) is connected to a gas recovery pipe.

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