A device and method for deodorizing the tail gas of trimethyl phosphite distillation

Abstract

This invention relates to the field of deodorization equipment technology, specifically to a deodorization device and method for trimethyl phosphite distillation tail gas. It includes a spray tower, within which spray pipes and nozzles installed at the lower ends of the spray pipes are arranged. A dynamic demisting packing layer is provided at the top inner part of the spray tower. The dynamic demisting packing layer comprises multiple thin plates arranged parallel and at equal intervals at the top inner part of the spray tower. Adjacent thin plates form a tail gas channel for the tail gas to pass through. The spray direction of the nozzles is towards the upper end of the thin plates and the upper port of the tail gas channel. A driving mechanism is also provided within the spray tower to drive the thin plates to reciprocate within the spray tower, periodically changing the flow cross-section of the tail gas channel formed by adjacent thin plates. This invention effectively solves the problems of liquid flow deviation and asynchronous gas-liquid distribution in traditional packing layers by periodically reciprocating the thin plates and alternately changing the cross-sectional shape of the tail gas channel.

Description

Technical Field

[0001] This invention relates to the field of deodorization equipment technology, and more specifically, to a deodorization device and method for the tail gas of trimethyl phosphite distillation. Background Technology

[0002] Trimethyl phosphite distillation is a process of separating and purifying this organophosphorus compound under high temperature and reduced pressure. During the process, impurities in the raw materials (such as residual phosphorus trichloride and methanol) and trace decomposition products (such as phosphine and hydrogen chloride) will form exhaust gases with irritating odors. These exhaust gases need to be introduced into a spray deodorization device. Through the circulating spraying of alkaline solutions (such as sodium hydroxide solution) or oxidizing solutions (such as sodium hypochlorite), they will undergo neutralization or oxidation reactions with acidic and reducing odorous components, thereby achieving chemical absorption and deodorization.

[0003] Existing spray deodorization devices often suffer from uneven distribution during actual operation: the liquid sprayed from the nozzles mainly concentrates in the upper part of the packing layer, where the surface of the upper packing is fully wetted and quickly participates in the reaction. By the time the liquid flows to the middle and lower layers, its effective active ingredients have been largely consumed, resulting in a significant decrease in reaction efficiency. At the same time, due to the packing stacking structure and the shielding effect of the upper liquid, the wetting rate of the lower packing, especially its inner side and lower surface, is low, failing to form a uniform liquid film. Meanwhile, the exhaust gas flows upward from the bottom of the tower and needs to come into full contact with the refreshed liquid on the packing surface for efficient purification. This contradiction of "asynchronous liquid-gas distribution and insufficient wetting of the lower packing" leads to the failure to fully utilize the mass transfer area, thus restricting the overall deodorization efficiency. Summary of the Invention

[0004] The present invention provides a deodorization device for the tail gas of trimethyl phosphite distillation, which solves the problems mentioned in the background art by means of a swingable thin plate, namely: a significant decrease in rate and mutual obstruction between packing materials.

[0005] To achieve the above objectives, a deodorization device for trimethyl phosphite distillation tail gas includes a spray tower. The spray tower contains a spray pipe and nozzles installed at the lower end of the spray pipe. A dynamic demisting packing layer is provided at the top inner surface of the spray tower. This dynamic demisting packing layer comprises multiple thin plates arranged parallel and at equal intervals at the top inner surface of the spray tower. Adjacent thin plates form a tail gas channel for the tail gas to pass through. The spray direction of the nozzles faces the upper end of the thin plates and the upper port of the tail gas channel. A driving mechanism is also provided within the spray tower. This driving mechanism drives each thin plate to reciprocate within the spray tower, periodically changing the flow cross-section of the tail gas channel formed by adjacent thin plates.

[0006] In the above technical solution, a horizontal pipe extending into the top of the spray tower is inserted horizontally, the spray pipe is fixedly connected to the horizontal pipe and communicates with it, a telescopic device is installed on the outer wall of the spray tower, a push plate is fixedly connected to the horizontal pipe, and the push plate is fixedly connected to the telescopic end of the telescopic device to increase the spray area of ​​the nozzle.

[0007] Based on the above, the driving mechanism includes a pull rope connected to the nozzle, the other end of the pull rope being connected to the top of the thin plate, the waist of the thin plate being connected to the spray tower via a rotating rod, a strip plate being connected inside the spray tower, and a guide hole being provided on the strip plate, through which the pull rope passes. When the nozzle moves laterally, the pull rope pulls the thin plate to swing around the rotating rod, thereby causing the thin plate to swing back and forth.

[0008] Secondly, the two thin plates at adjacent positions swing in opposite directions. When the thin plates swing, the flow cross section of the exhaust gas passage has a variable cross section structure that gradually narrows or expands along the airflow direction. The multiple thin plates are grouped into pairs. A first elastic element is installed between the bottoms of the two thin plates in each group. When the thin plates are not under the tension of the pull rope, the elastic force of the first elastic element forces the bottoms of the two thin plates to move closer to each other to maintain the initial opening of the lower port of the exhaust gas passage, so as to make the swing directions of the adjacent thin plates opposite.

[0009] Furthermore, multiple equally spaced vertical plates are arranged through the thin plate, and the vertical plates extend to the same length on both sides of the thin plate. Limiting plates are connected to both sides of each vertical plate, and a second elastic element is installed between the limiting plate and the thin plate. Pressure bars are provided on both sides of each vertical plate in the spray tower. When the thin plate tilts around the rotating bar, the vertical plate tilts with the thin plate and presses against the pressure bar on one side. Under the action of the top pressure, the vertical plate generates a lateral sliding displacement, which is used to increase the surface area of ​​the thin plate.

[0010] A method for deodorizing the tail gas from the distillation of trimethyl phosphite includes the following steps: S1. Introduce the exhaust gas into the bottom of the spray tower, and at the same time start the pump to extract the liquid in the water tank; S2. Liquid is sprayed onto the surface of the thin plate through the nozzle to form a liquid film, and exhaust gas rises through the exhaust gas channel. S3. The nozzles are driven to move back and forth by telescopic devices to expand the spray coverage area; S4. The movement of the nozzle causes the thin plate to oscillate periodically around the rotating rod. S5. Make the adjacent thin plates swing in opposite directions synchronously under the action of the pull rope and the first elastic element; S6 causes the cross-section of the exhaust gas passage to change periodically, while the vertical plate completes self-cleaning.

[0011] Therefore, by periodically oscillating the thin plate and alternating the cross-sectional shape of the exhaust gas passage, the problems of liquid flow deviation and asynchronous gas-liquid distribution in traditional packing layers are effectively solved.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: In this trimethyl phosphite distillation tail gas deodorization device, the thin plate is periodically oscillating to alternately change the cross-sectional shape of the tail gas channel. In the "wide lower opening-narrow upper opening" mode, the gas-liquid contact is enhanced, and in the "narrow lower opening-wide upper opening" mode, the uniform formation of the liquid film is promoted. This effectively solves the problems of liquid flow deviation and asynchronous gas-liquid distribution in traditional packing layers.

[0013] 2. In this trimethyl phosphite distillation tail gas deodorization device, the traditional packing material is replaced by a flat and swingable thin plate, which eliminates the mutual obstruction between the packing materials and significantly increases the effective mass transfer area. At the same time, the swinging process does not easily cause dirt to adhere and accumulate, which reduces system resistance and maintains long-term operational stability.

[0014] 3. In this trimethyl phosphite distillation tail gas deodorization device, the vertical plate set on the thin plate is pushed by the fixed pressure rod during the swinging process to generate lateral sliding, which can automatically scrape off the scale and residue attached to the surface, keep the mass transfer surface clean and active, and further ensure the durability of the deodorization effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the vertical tube structure of the present invention; Figure 4 This is a schematic diagram of the main sectional view of the vertical tube structure of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of part A in the middle; Figure 6 This is a schematic diagram of the thin plate structure of the present invention; Figure 7 This is a schematic diagram of the thin plate 13 in an inclined state according to the present invention.

[0016] The meanings of the labels in the diagram are as follows: 1. Spray tower; 2. Water tank; 3. Horizontal pipe; 4. Output pipe; 5. Pump body; 6. Telescopic device; 7. Spray head; 8. Spray pipe; 9. Hose; 10. Vertical pipe; 11. Rectangular groove; 12. Rotating rod; 13. Thin plate; 14. Exhaust gas passage; 15. Guide hole; 16. Pull rope; 17. Vertical plate; 18. Limiting plate; 19. Second elastic element; 20. Pressure rod; 21. First elastic element; 22. Strip plate; 23. Push plate. Detailed Implementation

[0017] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0018] Existing spray deodorization devices are prone to uneven liquid distribution, mainly concentrated in the upper packing layer, resulting in insufficient wetting of the lower layer and a decrease in active ingredients. At the same time, the exhaust gas flows from bottom to top and is not synchronized with the liquid distribution, causing the mass transfer area to be underutilized and the overall deodorization efficiency to be reduced.

[0019] Therefore, in view of the above-mentioned problems, the present invention provides a deodorization device for the tail gas of trimethyl phosphite distillation, referencing... Figure 1-3 As shown, a spray tower 1 includes an output port and an input port at its upper and lower ends, respectively. The spray tower 1 is equipped with a spray pipe 8 and a nozzle 7 installed at the lower end of the spray pipe 8. A dynamic demisting packing layer is provided at the top of the spray tower 1. The dynamic demisting packing layer includes multiple thin plates 13 arranged parallel and at equal intervals at the top of the spray tower 1. An exhaust gas channel 14 is formed between two adjacent thin plates 13 for the exhaust gas to pass through. The spraying direction of the nozzle 7 is towards the upper end of the thin plates 13 and the upper port of the exhaust gas channel 14. A driving mechanism is also provided in the spray tower 1. The driving mechanism is used to drive each thin plate 13 to swing back and forth in the spray tower 1 to periodically change the flow cross section of the exhaust gas channel 14 formed by adjacent thin plates 13. A vertical pipe 10 is fixedly connected to the top of the spray tower 1. A longitudinally extending rectangular groove 11 is opened at the top of the vertical pipe 10, and multiple thin plates 13 are arranged in the rectangular groove 11.

[0020] When this device is working, the tail gas generated by distillation is introduced from the bottom of the spray tower 1. At the same time, the nozzle 7 at the lower end of the spray pipe 8 sprays liquid into the thin plate 13 and the tail gas channel 14. Some of the liquid will adhere to the surface of the thin plate 13 to form a liquid film. The tail gas rises in the tower and comes into full contact with the liquid adhering to the surface of the thin plate 13 through the tail gas channel 14, and a neutralization reaction occurs, thereby achieving the purpose of deodorization. Finally, the purified gas is discharged from the outlet at the top of the spray tower 1. During this period, the drive mechanism drives the thin plate 13 to oscillate back and forth. When the thin plate 13 tilts to one side, one side of its surface tilts upward and the other side tilts downward. This dynamic design brings dual optimization: on the one hand, the liquid sprayed by the nozzle 7 can more comprehensively cover the upward tilting surface of the thin plate 13, enhancing wetting and liquid film renewal; on the other hand, the exhaust gas can more evenly sweep the downward tilting surface, improving gas-liquid contact efficiency. Moreover, this structure effectively reduces the problem of mutual occlusion of fillers in traditional filler layers, significantly increasing the effective mass transfer area. At the same time, since the surface of the thin plate 13 is flat and can oscillate, it is not easy for dirt to adhere and accumulate, which reduces the exhaust gas flow resistance and maintains the deodorization efficiency and stability of long-term operation.

[0021] Reference Figure 1 and Figure 2 A horizontal pipe 3 extending into the top of the spray tower 1 is inserted horizontally. The horizontal pipe 3 can slide back and forth horizontally on the side wall of the spray tower 1. The spray pipe 8 is fixedly connected to the horizontal pipe 3 and communicates with it. A telescopic device 6 is installed on the outer wall of the spray tower 1. The telescopic device 6 can be an electric telescopic cylinder or a hydraulic cylinder. A push plate 23 is fixedly connected to the horizontal pipe 3. The push plate 23 is fixedly connected to the telescopic end of the telescopic device 6. A water tank 2 for storing liquid is connected to the bottom outer wall of the spray tower 1. A pump body 5 for drawing liquid is installed on the water tank 2. The input end of the pump body 5 extends into the water tank 2. The output end of the pump body 5 is connected to an output pipe 4. The output pipe 4 is connected to the horizontal pipe 3 through a hose 9.

[0022] In use, the pump body 5 draws liquid from the water tank 2 and delivers it to the hose 9 through the output pipe 4. The hose 9 supplies the liquid to the horizontal pipe 3, which then distributes the liquid to each nozzle 8. Finally, the liquid is sprayed out by the nozzle 7 to form a spray. During the spraying process, the telescopic device 6 drives the push plate 23 to move back and forth. The push plate 23 drives the horizontal pipe 3 to move back and forth synchronously. The horizontal pipe 3 then drives the nozzle 8 and the nozzle 7 to move back and forth as a whole. This reciprocating motion significantly expands the spray coverage of the nozzle 7, allowing the liquid to adhere more evenly to the surface of the thin plate 13, improving the wetting uniformity and the gas-liquid contact effect.

[0023] Reference Figures 4-6 The driving mechanism includes a pull rope 16 connected to the nozzle 8. The other end of the pull rope 16 is connected to the top of the thin plate 13. The waist of the thin plate 13 is connected to the spray tower 1 through a rotating rod 12. A strip plate 22 located above the thin plate 13 is connected inside the spray tower 1. A guide hole 15 is provided on the strip plate 22. The guide hole 15 is a round hole with a chamfer on the end of the guide hole 15. The pull rope 16 passes through the guide hole 15. When the nozzle 8 moves laterally, the pull rope 16 will pull the thin plate 13 to swing around the rotating rod 12.

[0024] During spraying, the reciprocating nozzle 8 will synchronously pull the pull rope 16. When the nozzle 8 moves to one side, the taut pull rope 16, guided by the guide hole 15, pulls the top of the thin plate 13, causing the thin plate 13 to tilt to one side. The reciprocating motion of the nozzle 8 is converted into the periodic oscillation of the thin plate 13 through the pull rope 16, realizing the automatic synchronization of spraying and the tilting action of the thin plate 13.

[0025] Reference Figures 4-7 The two adjacent thin plates 13 swing in opposite directions. When the thin plates 13 swing, the flow cross section of the exhaust gas passage 14 has a variable cross section structure that gradually narrows or expands along the airflow direction, which will eventually make the cross section shape of the exhaust gas passage 14 a regular isosceles trapezoid or an inverted isosceles trapezoid. The multiple thin plates 13 are grouped into pairs. A first elastic element 21 is installed between the bottoms of the two thin plates 13 in each group. The first elastic element 21 can be a spring or an elastic rubber element. When the thin plates 13 are not under the tension of the pull rope 16, the elastic force of the first elastic element 21 forces the bottoms of the two thin plates 13 to move closer to each other to maintain the initial opening of the lower end of the exhaust gas passage 14. In the initial opening state, the bottoms of the two adjacent thin plates 13 in each group move closer to each other, and the pull rope 16 is in a slack state. When the two thin plates 13 are parallel to each other, the pull rope 16 is in a taut state (the pull rope 16 is under medium tension). When the two thin plates 13 are tilted in opposite directions, the pull rope 16 is under maximum tension.

[0026] Since the swing directions of the two adjacent thin plates 13 are always opposite, when the tops of the two thin plates 13 approach each other, the pull rope 16 is subjected to maximum tension, while the lower ends of the two thin plates 13 move away from each other, stretching the first elastic element 21. At this time, the lower port of the exhaust gas channel 14 expands and the upper port contracts. The exhaust gas entering from the lower end gradually converges towards the middle in the channel, and most of the airflow can fully contact the liquid film on the surface of the thin plates 13 on both sides of the channel, thereby significantly improving the gas-liquid reaction efficiency and deodorization effect. At the same time, due to the narrowing of the upper port, only a small amount of gas is sprayed. The liquid entering the channel effectively reduces the obstruction of the downward-flowing liquid on the upward-flowing exhaust gas. When the pull rope 16 is basically not under tension, the tops of the two thin plates 13 are not under tension. The elastic force of the first elastic element 21 will cause the lower ends of the two thin plates 13 to move closer to each other, while the upper ends move further apart. At this time, the lower port of the exhaust gas channel 14 narrows and the upper port expands. In this state, only a small amount of exhaust gas is allowed to enter the channel, while more sprayed liquid can enter and evenly cover the surface of the thin plates 13, which is conducive to forming a uniform and complete liquid film.

[0027] Through the aforementioned periodic oscillation, the two adjacent exhaust gas channels 14 alternately undertake different main functions: one stage focuses on enhancing gas-liquid contact and reaction, while the other stage focuses on optimizing liquid film formation and renewal. This dynamic division of labor and cooperation mechanism ensures mass transfer efficiency while taking into account the uniformity of the liquid film and the rationality of airflow distribution, thereby achieving continuous optimization of the overall deodorization performance of the system.

[0028] Reference Figures 5-7 As shown, a plurality of vertical plates 17 are arranged at equal intervals through the thin plate 13. The side wall of the thin plate 13 is provided with a strip groove, and the vertical plates 17 are inserted laterally into the strip groove. The length of the vertical plates 17 extending on both sides of the thin plate 13 is the same. Limiting plates 18 are connected to both sides of the vertical plates 17. A second elastic element 19 is installed between the limiting plate 18 and the thin plate 13. The second elastic element 19 can be a spring or an elastic rubber component. The elastic force of the second elastic element 19 is less than the elastic force of the first elastic element 21. A pressure rod 20 is provided on both sides of each vertical plate 17 in the spray tower 1. The pressure rod 20 is fixedly connected to the inner wall of the rectangular groove 11. When the thin plate 13 swings around the rotating rod 12 and tilts, the vertical plate 17 tilts with the thin plate 13 and presses against the pressure rod 20 on one side. The vertical plate 17 produces a lateral sliding displacement under the action of the top pressure.

[0029] During use, the vertical plate 17 effectively increases the gas-liquid contact area of ​​the thin plate 13, allowing more liquid to adhere to the surface, thereby improving the deodorization effect of exhaust gas. When the thin plate 13 swings and tilts, the vertical plate 17 gradually presses against the pressure rod 20, and the pressure rod 20 pushes the vertical plate 17 to slide laterally along the thin plate 13. During the sliding process, the vertical plate 17 overcomes the elastic force of the second elastic element 19, and its outer wall and the surface of the thin plate 13 generate relative movement, scraping off the liquid residue and scale deposits adhering to the vertical plate 17. Thus, the surface of the vertical plate 17 can be kept clean, and good mass transfer and adhesion performance can be maintained for a long time.

[0030] The second objective of this invention is to provide a method for deodorizing the tail gas from the distillation of trimethyl phosphite, comprising the following steps: S1. Introduce the exhaust gas into the bottom of the spray tower 1, and at the same time start the pump body 5 to extract the liquid in the water tank 2. S2. Liquid is sprayed onto the surface of thin plate 13 through nozzle 7 to form a liquid film, and exhaust gas rises through exhaust gas channel 14. S3. The nozzle 7 is driven to move back and forth by the telescopic device 6 to expand the spray coverage area; S4. The movement of the nozzle 7 causes the thin plate 13 to oscillate periodically around the rotating rod 12. S5. The adjacent thin plates 13 are made to swing synchronously in opposite directions under the action of the pull rope 16 and the first elastic element 21. S6 causes the cross-section of the exhaust gas passage 14 to change periodically, while the vertical plate 17 completes self-cleaning.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A deodorization device for the tail gas of trimethyl phosphite distillation, comprising a spray tower (1), wherein the spray tower (1) is provided with a spray pipe (8) and a nozzle (7) installed at the lower end of the spray pipe (8), characterized in that: The spray tower (1) is provided with a dynamic demisting packing layer at its inner top. The dynamic demisting packing layer includes multiple thin plates (13) arranged in parallel and at equal intervals at the inner top of the spray tower (1). A tail gas channel (14) is formed between two adjacent thin plates (13) for the tail gas to pass through. The spraying direction of the nozzle (7) is towards the upper end of the thin plate (13) and the upper port of the tail gas channel (14). The spray tower (1) is also equipped with a driving mechanism, which is used to drive each thin plate (13) to swing back and forth in the spray tower (1) to periodically change the flow cross section of the exhaust gas channel (14) formed by adjacent thin plates (13).

2. The deodorization device for trimethyl phosphite distillation tail gas according to claim 1, characterized in that: The top of the spray tower (1) is horizontally inserted with a horizontal pipe (3) extending into it. The spray pipe (8) is fixedly connected to the horizontal pipe (3) and communicates with each other. The outer wall of the spray tower (1) is equipped with a telescopic device (6). A push plate (23) is fixedly connected to the horizontal pipe (3). The push plate (23) is fixedly connected to the telescopic end of the telescopic device (6).

3. The deodorization device for trimethyl phosphite distillation tail gas according to claim 2, characterized in that: The driving mechanism includes a pull rope (16) connected to the nozzle (8), the other end of the pull rope (16) being connected to the top of the thin plate (13), the waist of the thin plate (13) being connected to the spray tower (1) through a rotating rod (12), a strip plate (22) being connected inside the spray tower (1), a guide hole (15) being provided on the strip plate (22), the pull rope (16) passing through the guide hole (15), and when the nozzle (8) moves laterally, the pull rope (16) pulls the thin plate (13) to swing around the rotating rod (12).

4. The deodorization device for trimethyl phosphite distillation tail gas according to claim 3, characterized in that: The two thin plates (13) at adjacent positions swing in opposite directions. When the thin plates (13) swing, the flow cross section of the exhaust gas passage (14) has a variable cross section structure that gradually shrinks or expands along the airflow direction.

5. The deodorization device for trimethyl phosphite distillation tail gas according to claim 4, characterized in that: Multiple thin plates (13) are grouped in pairs. A first elastic element (21) is installed between the bottoms of the two thin plates (13) in each group. When the thin plates (13) are not under the tension of the pull rope (16), the elastic force of the first elastic element (21) forces the bottoms of the two thin plates (13) to move closer to each other to maintain the initial opening of the lower port of the exhaust passage (14).

6. The deodorization device for trimethyl phosphite distillation tail gas according to claim 3, characterized in that: Multiple vertical plates (17) are provided through the thin plate (13) at equal intervals, and the vertical plates (17) extend to the same length on both sides of the thin plate (13).

7. The deodorization device for trimethyl phosphite distillation tail gas according to claim 6, characterized in that: Both sides of the vertical plate (17) are connected to limit plates (18). A second elastic element (19) is installed between the limit plate (18) and the thin plate (13). A pressure bar (20) is provided on both sides of each vertical plate (17) in the spray tower (1). When the thin plate (13) swings around the rotating rod (12) and tilts, the vertical plate (17) tilts with the thin plate (13) and presses against the pressure bar (20) on one side. The vertical plate (17) produces a lateral sliding displacement under the action of the top pressure.

8. The deodorization device for trimethyl phosphite distillation tail gas according to claim 1, characterized in that: The bottom outer wall of the spray tower (1) is connected to a water tank (2), and a pump body (5) is installed on the water tank (2). The input end of the pump body (5) extends into the water tank (2), and the output end of the pump body (5) is connected to an output pipe (4). The output pipe (4) is connected to the horizontal pipe (3) through a flexible hose (9).

9. The deodorization device for trimethyl phosphite distillation tail gas according to claim 1, characterized in that: The spray tower (1) has a vertical pipe (10) fixedly connected to its inner top. The top of the vertical pipe (10) has a longitudinally extending rectangular groove (11), and multiple thin plates (13) are arranged in the rectangular groove (11).

10. A method for deodorizing the tail gas from the distillation of trimethyl phosphite, characterized in that, The deodorization device for the tail gas of trimethyl phosphite distillation as described in claim 7 includes the following steps: S1. Pass the exhaust gas into the bottom of the spray tower (1) and start the pump body (5) to extract the liquid in the water tank (2); S2. The liquid is sprayed onto the surface of the thin plate (13) through the nozzle (7) to form a liquid film, and the exhaust gas rises through the exhaust gas channel (14). S3. Drive the nozzle (7) to move back and forth through the telescopic device (6) to expand the spray coverage area; S4. The movement of the nozzle (7) causes the thin plate (13) to swing periodically around the rotating rod (12); S5, causing adjacent thin plates (13) to swing synchronously in opposite directions under the action of the pull rope (16); S6 causes the cross-section of the exhaust gas passage (14) to change periodically, while the vertical plate (17) completes self-cleaning.

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