Tail gas purification equipment and application thereof in preparation of N, N-dimethylamino ethyl acrylate

Abstract

The invention relates to the technical field of tail gas treatment, in particular to tail gas purification equipment and application thereof in preparation of N, N-dimethylaminoethyl acrylate, the tail gas purification equipment comprises a spray tower and multiple groups of spraying mechanisms annularly arranged on the spray tower, and each spraying mechanism comprises two groups of nozzles arranged in the spray tower, a feeding pipe arranged outside the spray tower is connected with the nozzle, and a discharge port is formed in one end, far away from the nozzle, of the feeding pipe; the filter screen plate is arranged in the feeding pipe; the knocking structure is coaxially connected with the feeding pipe, and the knocking structure can move towards the discharging opening so as to strike the filter screen plate; and the pumping assembly is connected with the ends, away from the discharging opening, of the feeding pipes, and the pumping assembly can alternately pump compressed gas into the two feeding pipes and triggers the knocking structure to act before pumping the compressed gas, so that the phenomenon that the nozzle is blocked and the tail gas treatment effect is affected is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, in particular to tail gas purification equipment and application thereof in the preparation of N,N-dimethylaminoethyl acrylate. Background Art

[0002] N,N-dimethylaminoethyl acrylate is an important organic synthesis intermediate, widely used in medicine, pesticides and materials science. In the field of medicine, it is an important raw material for the synthesis of floxacin drugs, which have become the first choice for clinical anti-infection due to their broad antibacterial spectrum and strong antibacterial activity. In the field of pesticides, it can be used to produce cationic polymer flocculants, etc., and has important application value.

[0003] In the process of preparing N,N-dimethylaminoethyl acrylate, harmful tail gases such as dimethylamine and ethyl acrylate are produced. These tail gas components are harmful to human health and the environment. For example, dimethylamine has a pungent odor and is irritating to the respiratory tract and eyes of the human body, and ethyl acrylate is also irritating to the skin and eyes. Therefore, it needs to be purified when discharged to meet the requirements of environmental protection regulations.

[0004] In the prior art, the above-mentioned tail gas is mostly purified by spraying. Specifically, the waste gas first enters the spray absorption tower, which is equipped with nozzles and packing layers. In the spray absorption tower, the dimethylamine in the waste gas reacts chemically with the absorption liquid (such as dilute sulfuric acid) to generate corresponding salt substances, such as dimethylamine sulfate. These salt substances are deposited in the tower and form scaling.

[0005] In the spray absorption method, the absorption liquid usually needs to be recycled in consideration of the process characteristics and economic benefits. Recycling the absorption liquid can reduce the consumption of fresh absorption liquid, reduce operating costs, reduce wastewater discharge, and reduce the impact on the environment. However, recycling also brings some problems. As the salt substances in the absorption liquid continue to accumulate and the concentration gradually increases, when the concentration reaches a certain level, the salt substances will deposit inside the nozzle and form scaling.

[0006] During this process, scaling substances will adhere to the inside of the nozzle, causing the flow channel inside the nozzle to narrow, affecting the atomization spraying effect of the absorption liquid. Specifically, after the flow channel inside the nozzle becomes narrow, the flow rate and flow rate of the absorption liquid will be affected, resulting in uneven spraying, reducing the contact area and contact time between the exhaust gas and the absorption liquid, thereby reducing the absorption efficiency. In severe cases, the inside of the nozzle may be completely blocked, resulting in the absorption liquid being unable to spray normally, and the spray system cannot play its due role. Summary of the invention

[0007] The object of the present invention is to provide a tail gas purification device and its application in the preparation of N,N-dimethylaminoethyl acrylate, so as to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: The tail gas purification equipment comprises a spray tower and a plurality of spray mechanisms arranged in a ring shape on the spray tower, wherein the spray mechanisms comprise: Two groups of nozzles are arranged inside the spray tower, a feed pipe arranged outside the spray tower is connected to the nozzles, and a discharge port is arranged at one end of the feed pipe away from the nozzles; A filter screen plate is arranged inside the feed pipe; A knocking structure is coaxially connected to the feed pipe, and the knocking structure can move toward the discharge port to hit the filter screen plate; A pumping assembly is connected to one end of the feed pipe away from the discharge port. The pumping assembly can alternately pump compressed gas into the two groups of feed pipes and trigger the knocking structure to act before pumping compressed gas.

[0009] As a further solution of the present invention: the feed pipe is connected to a feed pipe and an air intake pipe, and a blocking plate perpendicular to the central axis of the feed pipe is sealingly and slidably mounted on the discharge port; The two groups of blocking plates arranged on the discharge port are connected via an execution structure, and the execution structure can drive the blocking plates to move to change the conduction state of the discharge port.

[0010] As a further solution of the present invention: the execution structure includes a supporting part arranged on the feeding pipe, a second electric telescopic rod is fixedly mounted on the supporting part, a transverse plate is connected to the action end of the second electric telescopic rod, and the transverse plate is slidably connected to the supporting part through a guide member; The transverse plate is symmetrically provided with two sets of guide grooves, and the groove wheels rotatably connected to the blocking plate can roll in the guide grooves; The guide groove includes a horizontal groove provided on the transverse plate and an inclined groove connected to the horizontal groove.

[0011] As a further solution of the present invention: the knocking structure comprises a telescopic shaft which is sealably and slidably arranged to penetrate the feed pipe, a knocking head is arranged at one end of the telescopic shaft which faces the filter screen, and a limit ring is formed on the telescopic shaft; The telescopic shaft is also sleeved with a first cylindrical spring, one end of the first cylindrical spring is connected to the limiting ring, and the other end is connected to the inner wall of the feeding pipe.

[0012] As a further solution of the present invention: the pump pressure assembly includes a pump cylinder body arranged on two groups of the feed pipes, and two groups of one-way valves with opposite conduction directions are arranged at both ends of the pump cylinder body, and one group of the one-way valves is connected to the feed pipe through a connecting pipe; A sealing plug is also sealingly and slidably mounted in the pump cylinder body, and the sealing plug is connected to a connecting rod that passes through the feed pipe; The pump pressure assembly also includes a power structure for driving the sealing plug and the telescopic shaft to move.

[0013] As a further solution of the present invention: the power structure includes a connecting frame fixedly connected to the connecting rod, and the connecting frame is connected to a first electric telescopic rod arranged on the feeding pipe; The power structure also includes a trigger kit connecting the connecting frame and the telescopic shaft, which can drive the sealing plug to work, so that external air can be drawn into one side of the pump cylinder body and the telescopic shaft on the side away from the movement direction of the sealing plug performs a telescopic action.

[0014] As a further solution of the present invention: the trigger kit includes a slide groove arranged perpendicular to the length direction of the connecting frame, a connecting rod is slidably installed in the slide groove, and the connecting rod is connected to the connecting frame through a second cylindrical spring; The trigger kit also includes a connecting plate fixedly connected to the telescopic shaft, the connecting plate is slidably connected to a guide member arranged on the feeding pipe, and one end of the connecting plate away from the telescopic shaft is connected to the connecting rod through a clearance kit.

[0015] As a further solution of the present invention: the said giving way kit comprises an inclined member fixedly connected to the said connecting rod and a convex shaft rotatably mounted on the said connecting plate, and the said inclined member cooperates with the said convex shaft to drive the said telescopic shaft to move away from the said filter screen plate.

[0016] The application of the tail gas purification equipment in the preparation of N,N-dimethylaminoethyl acrylate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: With the cooperation of the two sets of electric directional control valves and the two sets of blocking plates, during the process of switching the nozzles, firstly, it can be ensured that the absorption liquid will not overflow, and the pressure of the absorption liquid when it is sprayed toward the nozzle can be ensured to ensure the atomization effect of the absorption liquid and the absorption effect of the exhaust gas. Secondly, the absorption liquid in the feed pipe through which the absorption liquid originally flows can be compressed into the original nozzle, so as to avoid the waste caused by the residual absorption liquid flowing out when the blocking plate matched with the feed pipe is opened, and ensure that the absorption liquid is fully utilized. Finally, the blocking plate can be opened, and with the cooperation of the knocking structure and the pump pressure component, the scaling and blocking materials attached to the filter screen plate can be cleared out of the feed pipe. When the nozzle is switched next time, the filter screen plate can maintain the best filtering effect, and can ensure the flow speed of the absorption liquid and its injection pressure. On the one hand, the knocking head can be used to impact the filter screen plate, so that the scaling blockage materials adhering to the filter screen plate can be separated or loosened from the filter screen plate, thereby avoiding excessive adhesion between the scaling blockage materials and the filter screen plate, making it difficult to remove them. On the other hand, by pumping compressed air, the scaling blockage materials separated or loosened from the filter screen plate can be better removed from the feed pipe. The combination of these two aspects makes it possible to more thoroughly remove scaling blockage materials, ensuring that the filter screen plate has the best filtering effect when the absorption liquid flows through the filter screen plate next time, and ensuring the penetration speed of the absorption liquid, ensuring that the absorption liquid moves toward the nozzle with pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic structural diagram of an embodiment of an exhaust gas purification device.

[0019] Figure 2 This is a schematic structural diagram from another angle in an embodiment of the exhaust gas purification device.

[0020] Figure 3 This is a schematic diagram of the structure of a pump pressure component in an embodiment of an exhaust gas purification device.

[0021] Figure 4 This is a schematic diagram of the structure of a connecting frame and a connecting rod in an embodiment of an exhaust gas purification device.

[0022] Figure 5 This is a schematic structural diagram of a knocking structure in an embodiment of an exhaust gas purification device.

[0023] Figure 6 This is a schematic diagram of the structure of the knocking structure and the feed pipe in an embodiment of the exhaust gas purification equipment.

[0024] Figure 7 It is a structural schematic diagram of the execution structure in one embodiment of the exhaust gas purification equipment.

[0025] Figure 8It is a structural schematic diagram of three position states of two groups of blocking plates in an embodiment of the exhaust gas purification device.

[0026] Fig. 9 This is a schematic diagram of the structure of the inclined member and the cam shaft in the initial state in one embodiment of the exhaust gas purification device.

[0027] In the figure: 1. nozzle; 2. feed pipe; 3. filter screen; 4. feed pipe; 5. air inlet pipe; 6. knocking head; 7. telescopic shaft; 701. limit ring; 8. first cylindrical spring; 9. connecting plate; 10. guide member; 11. convex shaft; 12. connecting member; 13. pump cylinder body; 14. one-way valve; 15. connecting pipe; 16. sealing plug; 17. connecting frame; 1701. slide groove; 18. first electric telescopic rod; 19. connecting rod; 20. second cylindrical spring; 21. inclined member; 22. discharge port; 23. blocking plate; 24. transverse plate; 2401. inclined groove; 2402. horizontal groove; 25. groove wheel; 26. supporting part; 27. second electric telescopic rod; 28. guide member. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0030] See also Figure 1 to Figure 9 In an embodiment of the present invention, the exhaust gas purification equipment includes a spray tower and a plurality of spray mechanisms arranged in a ring shape on the spray tower, and the spray mechanism includes: two groups of nozzles 1, a filter screen plate 3, a knocking structure and a pump pressure component.

[0031] Two groups of nozzles 1 are arranged inside the spray tower, and a feed pipe 2 arranged outside the spray tower is connected to the nozzle 1. In detail, the nozzle 1 is connected to the lower end of the side of the feed pipe 2, and a discharge port 22 is arranged at one end of the feed pipe 2 away from the nozzle 1. Specifically, the two groups of feed pipes 2 connecting the two groups of nozzles 1 are connected by a connector 12, and a feed pipe 4 and an air intake pipe 5 are connected to the feed pipe 2. At the same time, a sealing plate 23 perpendicular to the central axis of the feed pipe 2 is installed on the discharge port 22 in a sealing and sliding manner; It should be noted that, in the present embodiment, the feed pipes 4 of the two groups of feed pipes 2 are connected to the same electric directional control valve, which is used to regulate the flow direction of the absorption liquid; at the same time, the air inlet pipes 5 of the two groups of feed pipes 2 are also connected to another electric directional control valve, which is responsible for controlling the flow direction of the gas. Through this arrangement, when supplying the absorption liquid and compressed gas, the absorption liquid or compressed gas can be selectively pumped to one of the two groups of feed pipes 2, thereby ensuring the stability and accuracy of the flow direction of the absorption liquid and compressed gas, avoiding the absorption liquid or compressed gas from moving toward the same group of feed pipes 2 at the same time, resulting in gas-liquid mixing and affecting the atomization effect of the absorption liquid, thereby ensuring the absorption effect of the atomized absorption liquid on the exhaust gas.

[0032] See also Figure 6~Figure 8 , the two groups of blocking plates 23 arranged on the discharge port 22 are connected by an execution structure, and the execution structure can drive the blocking plates 23 to move to change the conduction state of the discharge port 22; The execution structure includes a supporting portion 26 fixedly connected to the connecting member 12, a second electric telescopic rod 27 is fixedly mounted on the supporting portion 26, a transverse plate 24 is connected to the action end of the second electric telescopic rod 27, and the transverse plate 24 is slidably connected to the supporting portion 26 through a guide member 28; The transverse plate 24 is symmetrically provided with two sets of guide grooves, and the groove wheel 25 rotatably connected to the blocking plate 23 can roll in the guide grooves; The guide groove includes a horizontal groove 2402 provided on the transverse plate 24 and an inclined groove 2401 connected to the horizontal groove 2402 .

[0033] For easier understanding, please refer to Figure 8As shown, in the initial state, only the right side sealing plate 23 of the two groups of sealing plates 23 is in the sealing position for the corresponding group of discharge ports 22. At this time, when the absorption liquid flows into the supply pipe 2 corresponding to the discharge port 22 in the blocked state, since the discharge port 22 is blocked, the absorption liquid can only flow toward the nozzle 1, effectively preventing the absorption liquid from overflowing from the discharge port 22, thereby preventing the atomization effect from being deteriorated due to the reduction in the absorption liquid pumping pressure, ensuring that the atomized absorption liquid can be fully mixed with the exhaust gas, thereby improving the absorption effect. At the same time, the left side sealing plate 23 is in a state of being misaligned with the corresponding group of discharge ports 22, so that the pump pressure component can act on the supply pipe 2 corresponding to the unblocked discharge port 22, prompting the scaling-like blocking materials attached to the filter screen plate 3 in the supply pipe 2 to be discharged through the discharge port 22.

[0034] After a certain period of time in the above initial state, as the absorption liquid continues to circulate, some scaling and blocking materials will gradually adhere to the filter screen plate 3. At this time, the second electric telescopic rod 27 will start and drive the transverse plate 24 to move horizontally. Under the cooperation of the groove wheel 25 and the inclined groove 2401, the left sealing plate 23 moves downward, thereby blocking the discharge port 22 matched therewith, so that the discharge ports 22 on the two groups of feed pipes 2 are in a blocked state. At the same time, the electric directional control valve can switch the flow direction of the absorption liquid from one group of feed pipes 2 to another group of feed pipes 2, and spray it through another group of nozzles 1. In this state, the other group of electric directional control valves will pump compressed gas into the feed pipe 2 through which the absorption liquid originally flowed, and press the residual absorption liquid in the feed pipe 2 into the nozzle 1 connected thereto, thereby avoiding the waste caused by the residual absorption liquid flowing out when the sealing plate 23 matching the feed pipe 2 is opened, thereby ensuring that the absorption liquid is fully utilized.

[0035] When the absorption liquid in the feed pipe 2 is completely pressed into the nozzle 1, the second electric telescopic rod 27 will continue to operate. At this time, the right sealing plate 23 moves upward, so that the discharge port 22 on the matching feed pipe 2 is in a conductive state. In this state, the knocking structure and the pump pressure component cooperate with each other to effectively remove the scaling and blocking materials attached to the filter screen plate 3. In this way, when the nozzle 1 is switched next time, the filter screen plate 3 can maintain the best filtering effect, and can ensure the flow rate of the absorption liquid and its injection pressure.

[0036] Through the above-mentioned arrangement, with the cooperation of the two groups of electric directional control valves and the two groups of sealing plates 23, during the process of switching the nozzle 1, firstly, it can be ensured that the absorption liquid will not overflow, and the pressure of the absorption liquid when it is sprayed toward the nozzle 1 can be ensured to ensure the atomization effect of the absorption liquid and the absorption effect of the exhaust gas. Secondly, the absorption liquid in the feed pipe 2 through which the absorption liquid originally flowed can be compressed into the original nozzle 1, so as to avoid the waste caused by the residual absorption liquid flowing out when the sealing plate 23 coordinated with the feed pipe 2 is opened, and ensure that the absorption liquid is fully utilized. Finally, the sealing plate 23 can be opened, and with the cooperation of the knocking structure and the pump pressure component, the scaling and clogging materials attached to the filter mesh plate 3 can be cleared out of the feed pipe 2. When the nozzle 1 is switched next time, the filter mesh plate 3 can maintain the best filtering effect, and can ensure the flow rate of the absorption liquid and its injection pressure.

[0037] See also Figure 5 , the filter screen plate 3 is arranged inside the feed pipe 2; The knocking structure is coaxially connected to the feed pipe 2, and the knocking structure can move toward the discharge port 22 to hit the filter screen plate 3; The knocking structure includes a telescopic shaft 7 that is sealed and slidably arranged to penetrate the feed pipe 2, a knocking head 6 is arranged at one end of the telescopic shaft 7 that faces the filter screen plate 3, and a limit ring 701 is formed on the telescopic shaft 7; The telescopic shaft 7 is also sleeved with a first cylindrical spring 8 , one end of the first cylindrical spring 8 is connected to the limiting ring 701 , and the other end is connected to the inner wall of the feeding pipe 2 .

[0038] In the initial state, the first column spring 8 is in a naturally relaxed state. When the absorption liquid flows through the filter mesh plate 3, scaling-like blocking materials will gradually adhere to one side of the filter mesh plate 3. At this time, by pulling the telescopic shaft 7 away from the filter mesh plate 3, the first column spring 8 will be compressed. When the telescopic shaft 7 is released, the first column spring 8 will quickly return to its original state and release elastic potential energy, driving the telescopic shaft 7 and the knocking head 6 connected thereto to accelerate movement. Due to the effect of inertia, the knocking head 6 will continue to move toward the filter mesh plate 3 after moving to its original position, and collide with the filter mesh plate 3. This collision can effectively shake off scaling-like blocking materials adhered to the filter mesh plate 3, so that when the subsequent pump pressure component is actuated, as much scaling-like blocking materials on the filter mesh plate 3 as possible are removed to ensure its removal effect, thereby ensuring the normal filtering function of the filter mesh plate 3 and the injection pressure of the absorption liquid.

[0039] See also Figure 1 , Figure 3The pumping assembly is connected to one end of the feed pipe 2 away from the discharge port 22, and the pumping assembly can alternately pump compressed gas toward the two groups of feed pipes 2, and trigger the knocking structure action before pumping the compressed gas; The pump pressure assembly includes a pump cylinder body 13 arranged on two groups of the feed pipes 2, and two groups of one-way valves 14 with opposite conducting directions are arranged at both ends of the pump cylinder body 13, wherein one group of the one-way valves 14 is connected to the feed pipe 2 through a connecting pipe 15, wherein the conducting direction of one group of the one-way valves 14 is from the outside to the inside of the pump cylinder body 13, and the conducting direction of the other group of the one-way valves 14 is from the inside of the pump cylinder body 13 toward the feed pipe 2; A sealing plug 16 is also installed in a sealing and sliding manner in the pump cylinder body 13, and the sealing plug 16 is connected to a connecting rod passing through the feed pipe 2; The pump pressure assembly also includes a power structure for driving the sealing plug 16 and the telescopic shaft 7 to move. The power structure includes a connecting frame 17 fixedly connected to the connecting rod, and the connecting frame 17 is connected to a first electric telescopic rod 18 arranged on the feeding pipe 2.

[0040] During actual use, after the switching operation between the feed pipe 2 and the nozzle 1 is completed, the first electric telescopic rod 18 will drive the connected frame 17 to move. At this time, the connecting frame 17 drives the sealing plug 16 to move through the connecting rod, so that a negative pressure is formed in the space on the side of the pump cylinder body 13 away from the sealing plug 16. With the help of the negative pressure, external air can be sucked into the pump cylinder body 13. Subsequently, the first electric telescopic rod 18 will quickly move in the opposite direction to compress the air sucked into the pump cylinder body 13. In this way, the compressed gas can enter the feed pipe 2 through the connecting pipe 15, and then the scaling and blocking materials remaining on one side of the filter screen 3 in the feed pipe 2 and shaken off by the knocking head 6 are cleared out of the feed pipe 2, thereby ensuring that when the subsequent absorption liquid passes through the filter screen 3 again, the filter screen 3 can exert a better filtering effect.

[0041] Through the above arrangement, on the one hand, the knocking head 6 can be used to impact the filter mesh plate 3, so that the scaling clogging materials adhered to the filter mesh plate 3 can be separated from or loosened from the filter mesh plate 3, avoiding that the adhesion between the scaling clogging materials and the filter mesh plate 3 is too large, making it difficult to remove them. On the other hand, by pumping compressed air, the scaling clogging materials separated or loosened from the filter mesh plate 3 can be better removed from the feed pipe 2. The combination of these two aspects makes it possible to more thoroughly remove the scaling clogging materials, ensuring that the filter mesh plate 3 has the best filtering effect when the absorption liquid flows through the filter mesh plate 3 next time, and ensuring that the absorption liquid passes through the nozzle 1 with pressure.

[0042] See also Figure 3~Figure 5 , Fig. 9The power structure further includes a trigger kit connecting the connecting frame 17 and the telescopic shaft 7, the trigger kit can drive the sealing plug 16 to work, so that external air can be drawn into one side of the pump cylinder body 13, and the telescopic shaft 7 away from the moving direction of the sealing plug 16 performs a telescopic action; The trigger kit includes a slide groove 1701 arranged perpendicular to the length direction of the connecting frame 17, a connecting rod 19 is slidably installed in the slide groove 1701, and the connecting rod 19 is connected to the connecting frame 17 through a second cylindrical spring 20; The trigger kit also includes a connecting plate 9 fixedly connected to the telescopic shaft 7, the connecting plate 9 is slidably connected to a guide member 10 arranged on the connecting member 12, and the end of the connecting plate 9 away from the telescopic shaft 7 is connected to the connecting rod 19 through a clearance kit, the clearance kit includes an inclined member 21 fixedly connected to the connecting rod 19 and a convex shaft 11 rotatably mounted on the connecting plate 9, the inclined member 21 cooperates with the convex shaft 11 to drive the telescopic shaft 7 to move away from the filter screen plate 3.

[0043] In the initial state, the second cylindrical spring 20 is in a stretched state. At this time, the connecting rod 19 is in a state of abutting against the slide groove 1701, so that when the first electric telescopic rod 18 is actuated, the connecting frame 17 can drive the inclined member 21 to move. When the inclined member 21 abuts against one group of convex shafts 11, the inclined member 21 can guide the convex shaft 11 to move along the length direction of the inclined member 21. At this time, the telescopic shaft 7 can move away from the filter screen 3, and the first cylindrical spring 8 is compressed. When the convex shaft 11 moves to the end of the inclined member 21, the convex shaft 11 can be separated from the inclined member 21, and under the action of the first cylindrical spring 8, the telescopic shaft 7 can drive the knocking head 6 to hit the filter screen 3, and then the first electric telescopic rod 18 moves in the opposite direction to pump compressed gas into the feed pipe 2, thereby achieving the removal of scaling-like blocking substances.

[0044] During the reverse movement of the first electric telescopic rod 18, when the convex shaft 11 abuts against the inclined member 21 again, the convex shaft 11 can act on the inclined member 21, so that the inclined member 21 drives the connecting rod 19 to move along the length direction of the slide groove 1701. At this time, the second cylindrical spring 20 can be further stretched until the connecting frame 17 is reset. The convex shaft 11 and the inclined member 21 can be reset to the initial state, so that the above process can be repeated when the connecting frame 17 moves next time.

[0045] Through the above arrangement, when the first electric telescopic rod 18 is actuated, the telescopic shaft 7 and the striking head 6 can be triggered to hit the filter screen plate 3 first, so as to shake off the scaling clogging materials adhering to the filter screen plate 3 or loosen them from the filter screen plate 3, and then pump compressed air to remove the scaling clogging materials, thereby ensuring the cleaning effect.

[0046] The application of the tail gas purification equipment in the preparation of N,N-dimethylaminoethyl acrylate.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An exhaust gas purification device, comprising a spray tower and a plurality of spray mechanisms arranged in a ring shape on the spray tower, characterized in that: The spraying mechanism comprises: two groups of nozzles (1) arranged inside the spray tower, a feed pipe (2) arranged outside the spray tower and connected to the nozzle (1), an end of the feed pipe (2) away from the nozzle (1) being provided with a discharge port (22); a filter screen (3) arranged inside the feed pipe (2); a knocking structure coaxially connected to the feed pipe (2), the knocking structure being able to move toward the discharge port (22) to strike the filter screen (3); and a pumping assembly connected to an end of the feed pipe (2) away from the discharge port (22), the pumping assembly being able to alternately pump compressed gas into the two groups of feed pipes (2), and triggering the knocking structure to act before pumping the compressed gas.

2. The exhaust gas purification equipment according to claim 1, characterized in that: The feed pipe (2) is connected to a feed pipe (4) and an air intake pipe (5), and a blocking plate (23) perpendicular to the central axis of the feed pipe (2) is sealingly and slidably mounted on the discharge port (22); two groups of the blocking plates (23) arranged on the discharge port (22) are connected via an execution structure, and the execution structure can drive the blocking plates (23) to move so as to change the conduction state of the discharge port (22).

3. The exhaust gas purification equipment according to claim 2, characterized in that: The execution structure comprises a supporting portion (26) arranged on the feeding pipe (2), a second electric telescopic rod (27) is fixedly mounted on the supporting portion (26), a transverse plate (24) is connected to the action end of the second electric telescopic rod (27), and the transverse plate (24) is slidably connected to the supporting portion (26) via a guide member (28); two groups of guide grooves are symmetrically arranged on the transverse plate (24), and a groove wheel (25) rotatably connected to the blocking plate (23) can roll in the guide grooves; the guide grooves comprise a horizontal groove (2402) arranged on the transverse plate (24) and an inclined groove (2401) connected to the horizontal groove (2402).

4. The exhaust gas purification equipment according to claim 1, characterized in that: The knocking structure comprises a telescopic shaft (7) which is sealingly and slidably arranged to penetrate the feed pipe (2); a knocking head (6) is arranged at one end of the telescopic shaft (7) which faces the filter screen (3); and a limit ring (701) is formed on the telescopic shaft (7); a first cylindrical spring (8) is also sleeved on the telescopic shaft (7); one end of the first cylindrical spring (8) is connected to the limit ring (701), and the other end is connected to the inner wall of the feed pipe (2).

5. The tail gas purification equipment according to claim 4, characterized in that: The pump pressure assembly comprises a pump cylinder body (13) arranged on two groups of the feed pipes (2), and two groups of one-way valves (14) with opposite conduction directions are respectively arranged at both ends of the pump cylinder body (13), and one group of the one-way valves (14) is connected to the feed pipe (2) through a connecting pipe (15); a sealing plug (16) is also sealed and slidably installed in the pump cylinder body (13), and the sealing plug (16) is connected to a connecting rod passing through the feed pipe (2); the pump pressure assembly also includes a power structure for driving the sealing plug (16) and the telescopic shaft (7) to move.

6. The tail gas purification equipment according to claim 5, characterized in that: The power structure comprises a connecting frame (17) fixedly connected to the connecting rod, the connecting frame (17) being connected to a first electric telescopic rod (18) arranged on the feed pipe (2); the power structure also comprises a trigger kit connecting the connecting frame (17) and the telescopic shaft (7), the trigger kit being capable of driving the sealing plug (16) to work, so that external air can be drawn into one side of the pump cylinder body (13), and causing the telescopic shaft (7) on the side away from the movement direction of the sealing plug (16) to perform a telescopic action.

7. The exhaust gas purification device according to claim 6, characterized in that: The trigger kit comprises a slide groove (1701) arranged perpendicular to the length direction of the connecting frame (17), a connecting rod (19) is slidably installed in the slide groove (1701), and the connecting rod (19) is connected to the connecting frame (17) via a second columnar spring (20); the trigger kit also comprises a connecting plate (9) fixedly connected to the telescopic shaft (7), the connecting plate (9) is slidably connected to a guide member (10) arranged on the feed pipe (2), and an end of the connecting plate (9) away from the telescopic shaft (7) is connected to the connecting rod (19) via a clearance kit.

8. The exhaust gas purification device according to claim 7, characterized in that: The clearance kit comprises an inclined member (21) fixedly connected to the connecting rod (19) and a convex shaft (11) rotatably mounted on the connecting plate (9); the inclined member (21) cooperates with the convex shaft (11) to drive the telescopic shaft (7) to move away from the filter screen plate (3).

9. Use of the tail gas purification device according to any one of claims 1 to 8 in the preparation of ethyl N,N-dimethylaminoacrylate.

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