Gas recovery tower

Abstract

The utility model 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. According to the utility model, through the arrangement of the blocking assembly, to-be-treated gas in the absorption tower can be blocked, the gas rising speed can be reduced, 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 utility model relates to the technical field of gas recovery, in particular to a gas recovery tower. Background Art

[0002] There are many methods for recovering carbon dioxide, and the use of chemical agents is the most common and practical. It mainly involves first allowing the raw gas to chemically react 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, desorbing the carbon dioxide, thereby completing the purpose of carbon dioxide separation and absorption.

[0003] Existing carbon dioxide recovery towers mainly include an absorption tower and a desorption tower, as shown in 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. As the recovered gas rises, an ethanolamine solution is sprayed out through the nozzle, which comes into contact with the gas and reacts with the carbon dioxide in the gas. The ethanolamine solution that absorbs the carbon dioxide eventually accumulates at the bottom of the absorption tower cavity and flows into the desorption tower through a reflux pipe for further desorption, separation and recovery. The remaining recovered gas is discharged from the exhaust gas recovery pipe at the top of the absorption tower.

[0004] However, the rising speed of the recovered gas within the absorber is difficult to control. Excessive ascent can result in some gas not fully coming into contact with the ethanolamine solution, leading to incomplete gas treatment and, consequently, poor CO2 recovery. Furthermore, the ethanolamine solution sprayed from the nozzles risks entering the vents in the intake pipe, potentially blocking them and affecting air flow. Utility Model Content

[0005] The utility model aims to provide a gas recovery tower with better recovery effect.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model 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 to 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 provided 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 arranged in the absorption tower and capable of periodic opening and closing, and a driving component for driving the blocking component to periodically open and close. 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 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 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, preventing the reaction drugs from falling into the air inlet pipe and affecting the air intake of the air inlet pipe.

[0010] Preferably, the barrier assembly includes a first barrier plate fixedly installed in the absorption tower and matching the inner wall of the absorption tower, and a second barrier plate rotatably arranged on the upper or lower side of the first barrier plate. The first barrier plate and the second barrier plate are in contact with each other and have a through channel respectively formed thereon. When the barrier assembly is in a closed state, the relative ports of the channels of the first and second barrier plates are staggered to prevent gas from passing through. When the barrier assembly is in an open state, the relative ports of the channels of the second and first barrier plates have an overlapping area in the horizontal plane to allow gas to pass through. 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, which 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 the 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 baffle plate and the second baffle plate are coaxial and the multiple channels of the two baffle plates 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 engaged with the driving wheel. The driven wheel is fixedly connected to the second blocking plate and is controlled by the motor. 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 disposed within the absorption tower, controlled by the drive assembly, and capable of reciprocatingly blocking the gas outlet pipe. The reciprocating blocking of the gas outlet pipe by the blocking member slows the rate at which gas is discharged from the absorption tower, thereby further increasing the residence time of the gas within the absorption tower and enabling a more complete reaction between the reagent and the gas.

[0017] Further preferably, the blocking member has a plurality of blades arranged around its rotation axis. 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 rods are multiple and spaced apart.

[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 multiple 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 desorption tower.

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

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

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

[0030] The barrier assembly of the present application can be periodically opened and closed under the driving action of the driving assembly. When the barrier assembly is closed, it intercepts the gas to be treated in the absorption tower, hindering the gas from rising, slowing its rising speed, and prolonging its residence time in the absorption tower, thereby allowing it to fully react with the reactant sprayed by the liquid spray assembly. When the barrier assembly switches from closed to open, the target gas in the gas to be treated has been fully absorbed by the reactant, and the remaining gas can rise through the barrier assembly and be discharged from the 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 make the gas to be treated entering the absorption tower 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 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 Schematic diagram of the structure of the arresting mechanism of Example 1;

[0036] Figure 4 Schematic diagram of the structure of the dispersion mechanism and the air intake pipe of Example 1;

[0037] Figure 5 Schematic diagram of the structure of the liquid spray 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 spray assembly; 51. Ring pipe; 52. Spray head; 53. Connecting pipe;

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

[0044] 7. Return pipe. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0046] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, 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 description are to be regarded as illustrative in nature and not restrictive.

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

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. 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, "plurality" means two or more, unless otherwise specifically defined.

[0049] In the embodiments of the present invention, unless otherwise expressly specified or 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 for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself 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 desorption tower 2 and the output end 62 is connected to the liquid spraying assembly 5 , so as to transport the desorbed reaction drugs in the desorption tower 2 to the liquid spraying assembly 5 and spray them out from the liquid spraying assembly 5 .

[0054] The liquid spraying assembly 5 includes a nozzle group, such as Figure 5As 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 spray assembly 5 also includes a connecting pipe 53 for connecting the multiple groups of nozzle groups. 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, there are two groups of nozzle 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 by a U-shaped connecting pipe 53.

[0055] An inlet pipe 11 and an outlet pipe 12 are connected to the upper and lower sides of the absorption tower 1, respectively. Preferably, the output end of the inlet pipe extends vertically 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 extends vertically into the absorption tower 1. Its specific location 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 an impeding mechanism 3 .

[0057] The dispersion mechanism includes a cover body 4 provided below the liquid spray assembly 5. The cover body 4 is provided 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 passage of gas from the air inlet pipe 11. A gap is provided between the circumference of the cover body 4 and the inner wall of the absorption tower 1 for the passage of gas or the reaction drug sprayed by the liquid spray assembly 5. On the one hand, the provision of the cover body 4 enables the gas to be treated entering the absorption tower 1 to be more evenly dispersed in the absorption tower 1, thereby ensuring 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 4 As shown, the cover body 4 has a horizontally arranged middle portion and a peripheral side portion extending downwardly 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 intake pipe. In this embodiment, the cover body 4 is connected to the output end of the air intake pipe. Specifically, the dispersion mechanism also includes a connecting rod 41 connected between the input ends of the cover body air intake 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 through. 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, hindering the ascent of the gas, slowing down the ascent speed of the gas, and prolonging the residence time of the gas in the absorption tower 1, 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 barrier assembly switches from a closed state to an open state, gas can pass through the barrier assembly and rise. At this time, because the target gas in the gas to be treated has been fully absorbed by the reactant, the gas that passes through is essentially free of the target gas and can be discharged through the outlet pipe 12. As the inlet pipe 11 continues to intake air, the incoming gas can be effectively treated by the periodic opening and closing of the barrier assembly, which is very convenient and has good sustainability.

[0060] Further, if Figure 3As shown, the barrier assembly includes a first baffle plate 33 fixedly mounted within the absorption tower 1 and aligned with the inner wall of the absorption tower 1, and a second baffle plate 34 rotatably mounted above or below the first baffle plate 33. The term "aligned" generally refers to the shape and size of the first baffle plate 33 being aligned with the inner cavity of the absorption tower 1, i.e., the circumference of the first baffle plate 33 is in close contact with the inner cavity of the absorption tower 1. The first baffle plate 33 and the second baffle plate 34 are in close contact with each other and each has a through-passage. When the barrier assembly is closed, the opposing ends of the passages of the first and second baffle plates 33 and 34 are offset to block gas. When the barrier assembly is open, the opposing ends of the passages of the second baffle plate 34 and the first baffle plate 33 overlap horizontally to allow gas to pass through. When the second baffle plate 34 rotates, the barrier assembly can switch between the closed and open states. In this embodiment, the barrier assembly is located between the two nozzle groups and adjacent to the lower nozzle group. The second barrier plate 34 is located above the first barrier plate 33. The second channel 341 extends vertically through the second barrier plate 33. The first channel 331 extends vertically through the first barrier plate 33. There are four first and four second channels 331, respectively. When the barrier assembly is open, the first and second channels 331 overlap, allowing gas beneath the first barrier plate 33 to pass through. The barrier assembly is periodically opened and closed by rotating the second barrier plate 34, resulting in a simple structure and easy 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 engaged with the driving wheel 35. The driven wheel 36 is fixedly connected to the second blocking plate 34 through 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 sealing member 37 rotatably arranged in the absorption tower 1. Controlled by the driving assembly, the sealing member 37 can reciprocatingly block the 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 multiple blades arranged around its rotational axis (i.e., the axis of the output shaft 32 of the motor 31; in other words, the blocking member 37 and the blocking mechanism 3 share the same motor 31). When the blocking member 37 blocks the outlet pipe 12, one of the multiple blades blocks the air inlet end of the outlet pipe 12 and prevents air from entering. 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 specific details can be referred to the prior art and are not limited in this application. The analytical tower 2 is connected to a gas recovery pipe, and the target gas after the analytical tower 2 is analyzed 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 gas to be treated is recovered, the gas is first transported to the absorption tower 1 using the air inlet pipe 11. When the gas flows out from the output end of the air inlet pipe, it will impact the cover 4. The cover 4 disperses the gas so that the gas flows upward from multiple directions along the circumference of the cover 4. During the upward flow of the gas, the pump 6 is started, and the ethanolamine solution (reaction drug) after decomposition in the decomposition tower 2 is delivered 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 is finally ejected from multiple nozzles 52 through the annular pipe 51, fully covering the cross-section inside 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 barrier 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 baffle plate 34 is driven to rotate by utilizing the mutual engagement transmission effect of the driving wheel 35 and the driven wheel 36, so that the second channel 341 on the second baffle plate 34 and the first channel 331 on the first baffle 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 eventually be discharged from the outlet pipe 12 when the barrier assembly is opened. Since the output shaft 32 of the motor 31 drives the sealing member 37 to rotate, the outlet pipe 12 will be reciprocatedly blocked, thereby slowing down the speed at which the gas is discharged 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 accumulate 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 embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection 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 spray 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 spray assembly (5), and is used to transport the reactants after desorption in the desorption tower (2) to the liquid spray assembly (5) and spray them out from the liquid spray 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 (4) disposed below the liquid spraying assembly (5), the cover (4) being disposed above the output end of the air inlet pipe and having a gap between its circumference and the inner wall of the absorption tower (1); The blocking mechanism (3) comprises a blocking component arranged in the absorption tower (1) and capable of periodic opening and closing, and a driving component for driving the blocking component to periodically open and close. 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 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 together and have through-channels respectively opened thereon. When the blocking assembly is in a closed state, the opposite ports of the channels of the first blocking plate (33) and the second blocking plate (34) are staggered; when the blocking assembly is in an open state, the opposite ports of the channels 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 the same number of channels. When the blocking assembly is in an open state, the channels of the first blocking plate (33) and the second blocking plate (34) overlap in a one-to-one correspondence. 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 blocks 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) 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; 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 nozzles and a connecting pipe (53) for connecting the two groups of nozzles, each group of nozzles comprises an annular pipe (51) mounted 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 nozzles.

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