Tail gas purification equipment and its application in the preparation of N,N-diethylaminoethyl acrylate

Abstract

The present invention relates to the technical field of tail gas treatment, specifically to a tail gas purification device and its application in the preparation of N,N-diethylaminoethyl acrylate, including a spray tower and a plurality of spraying mechanisms arranged in a ring on the spray tower. The spraying mechanism includes: two nozzles arranged inside the spray tower, a feeding pipe arranged outside the spray tower is connected to the nozzles, and a discharge port is arranged at the end of the feeding pipe away from the nozzles; a filter screen plate arranged inside the feeding pipe; a knocking structure coaxially connected to the feeding pipe, and the knocking structure can move towards the discharge port to impact the filter screen plate; a pump pressure assembly is connected to the end of the feeding pipe away from the discharge port, and the pump pressure assembly can alternately pump compressed gas into two groups of the feeding pipes, and trigger the knocking structure to act before pumping the compressed gas, so as to prevent the nozzles from being blocked and affecting the tail gas treatment effect.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, specifically to a tail gas purification device and its application in the preparation of ethyl N,N-dimethylaminocrotonate. Background Art

[0002] Ethyl N,N-dimethylaminocrotonate is an important organic synthesis intermediate, widely used in fields such as medicine, pesticides, and materials science. In the medical field, it is an important raw material for synthesizing quinolone drugs. Such drugs have become the first choice for clinical anti-infection due to their broad antibacterial spectrum and strong antibacterial activity. In the pesticide field, it can be used to produce cationic polymer flocculants, etc., and has important application value.

[0003] During the preparation of ethyl N,N-dimethylaminocrotonate, harmful tail gases such as dimethylamine and ethyl acrylate are generated. These tail gas components are harmful to human health and the environment to a certain extent. For example, dimethylamine has a pungent odor and irritates the respiratory tract and eyes of the human body, and ethyl acrylate also irritates the skin and eyes. Therefore, it needs to be purified before emission to meet the requirements of environmental protection regulations.

[0004] In the prior art, most of the above-mentioned tail gases are purified by spraying. Specifically, the waste gas first enters a spray absorption tower, which is equipped with nozzles and a packing layer and other structures. In the spray absorption tower, dimethylamine in the waste gas reacts with the absorption liquid (such as dilute sulfuric acid) to generate corresponding salt substances, such as dimethyl sulfate. These salt substances deposit in the tower and form scale.

[0005] In the spray absorption method, considering the process characteristics and economic benefits, the absorption liquid usually needs to be recycled. Recycling the absorption liquid can reduce the consumption of fresh absorption liquid, lower the operating cost, and at the same time reduce the discharge of wastewater and the impact on the environment. However, recycling also brings some problems. Due to the continuous accumulation of salt substances in the absorption liquid and the gradual increase in concentration, when the concentration reaches a certain level, the salt substances will deposit inside the nozzle and form scale.

[0006] During this process, the scale-like substances will adhere to the inside of the nozzle, resulting in a narrowing of the flow channel inside the nozzle and affecting the atomization spraying effect of the absorption liquid. Specifically, after the flow channel inside the nozzle narrows, the flow rate and flow of the absorption liquid will be affected, resulting in uneven spraying, reducing the contact area and contact time between the waste gas and the absorption liquid, and thus reducing the absorption efficiency. Seriously, the inside of the nozzle may be completely blocked, causing the absorption liquid to not be able to spray out normally, and the spraying system cannot play its due role. Summary of the Invention

[0007] The object of the present invention is to provide an exhaust gas purification device and its application in the preparation of ethyl N,N-dimethylaminocrotonate, so as to solve the problems put forward in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An exhaust gas purification device, including a spray tower and a plurality of spraying mechanisms arranged in a ring on the spray tower, the spraying mechanism includes:

[0010] Two groups of nozzles, 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 far from the nozzles;

[0011] A filter screen plate, arranged inside the feed pipe;

[0012] A knocking structure, coaxially connected to the feed pipe, and the knocking structure can move towards the discharge port to impact the filter screen plate;

[0013] A pump pressure assembly, connected to one end of the feed pipe far from the discharge port, and the pump pressure assembly can alternately pump compressed gas into two groups of the feed pipes and trigger the knocking structure to act before pumping the compressed gas.

[0014] As a further scheme of the present invention: an inlet pipe and an inlet gas pipe are connected to the feed pipe, and a sealing plate perpendicular to the central axis of the feed pipe is slidably installed on the discharge port;

[0015] Two groups of the sealing plates arranged on the discharge port are connected through an execution structure, and the execution structure can drive the sealing plates to act to change the conduction state of the discharge port.

[0016] As a further scheme of the present invention: the execution structure includes a supporting part arranged on the feed pipe, a second electric telescopic rod is fixedly installed on the supporting part, a transverse moving plate is connected to the action end of the second electric telescopic rod, and the transverse moving plate is slidably connected to the supporting part through a guiding member;

[0017] Two groups of guiding grooves are symmetrically arranged on the transverse moving plate, and a sheave rotatably connected to the sealing plate can roll in the guiding grooves;

[0018] The guiding grooves include a horizontal groove arranged on the transverse moving plate and an inclined groove connected to the horizontal groove.

[0019] As a further scheme of the present invention: the knocking structure includes a telescopic shaft hermetically and slidably arranged through the feed pipe, a knocking head is arranged at one end of the telescopic shaft facing the filter screen plate, and a limiting ring is formed on the telescopic shaft;

[0020] 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.

[0021] 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;

[0022] 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;

[0023] The pump pressure assembly also includes a power structure for driving the sealing plug and the telescopic shaft to move.

[0024] 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;

[0025] 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.

[0026] 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;

[0027] 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.

[0028] As a further solution of the present invention: the said making 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.

[0029] The application of the tail gas purification equipment in the preparation of N,N-dimethylaminoethyl acrylate.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] With the cooperation of two groups of electric direction control valves and two groups of plugging plates, during the process of switching the nozzles, first, it can ensure that the absorption liquid will not overflow, and ensure the pressure when the absorption liquid is sprayed towards the nozzle to guarantee the atomization effect of the absorption liquid and the absorption effect on the tail gas. Second, it can compress the absorption liquid remaining in the feeding pipe through which the absorption liquid originally flowed into the original nozzle, thus avoiding waste caused by the outflow of the remaining absorption liquid when the plugging plate cooperating with the feeding pipe is opened, ensuring the full utilization of the absorption liquid. Finally, the plugging plate can be opened, and with the cooperation of the knocking structure and the pump pressure assembly, the scaling and clogging substances attached to the filter mesh plate can be removed from the feeding pipe. When switching the nozzles next time, the filter mesh plate can maintain the best filtering effect and ensure the flow rate of the absorption liquid and its spraying pressure;

[0032] On the one hand, it can use the knocking head to impact the filter mesh plate, so that the scaling and clogging substances adhering to the filter mesh plate can be separated or loosened from the filter mesh plate, avoiding the excessive adhesion force between the scaling and clogging substances and the filter mesh plate, which makes it difficult to remove them. On the other hand, by pumping compressed air, the scaling and clogging substances separated or loosened from the filter mesh plate can be better removed from the feeding pipe. The combination of the two aspects makes the removal of the scaling and clogging substances more thorough, ensuring that when the absorption liquid flows through the filter mesh plate next time, the filter mesh plate can have the best filtering effect and guarantee the passing speed of the absorption liquid, ensuring the pressure of the absorption liquid moving towards the nozzle. Brief Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of an embodiment of the tail gas purification equipment.

[0034] Figure 2 It is a schematic structural diagram of another angle in an embodiment of the tail gas purification equipment.

[0035] Figure 3 It is a schematic structural diagram of the pump pressure assembly in an embodiment of the tail gas purification equipment.

[0036] Figure 4 It is a schematic structural diagram of the connecting rod and the connecting bar in an embodiment of the tail gas purification equipment.

[0037] Figure 5 It is a schematic structural diagram of the knocking structure in an embodiment of the tail gas purification equipment.

[0038] Figure 6 It is a schematic structural diagram of the knocking structure and the feeding pipe in an embodiment of the tail gas purification equipment.

[0039] Figure 7 It is a schematic structural diagram of the execution structure in an embodiment of the tail gas purification equipment.

[0040] Figure 8 It is a structural schematic diagram of three position states of two sets of plugging plates in an embodiment of an exhaust gas purification device.

[0041] Figure 9 It is a structural schematic diagram of an inclined member and a convex shaft in an initial state in an embodiment of an exhaust gas purification device.

[0042] In the figure: 1. Nozzle; 2. Feeding pipe; 3. Filter mesh plate; 4. Feed pipe; 5. Intake pipe; 6. Knocking head; 7. Telescopic shaft; 701. Limit ring; 8. First cylindrical spring; 9. Linking plate; 10. Guide member; 11. Convex shaft; 12. Connecting member; 13. Pump cylinder block; 14. Check valve; 15. Connecting pipe; 16. Sealing plug; 17. Connecting frame; 1701. Chute; 18. First electric telescopic rod; 19. Connecting rod; 20. Second cylindrical spring; 21. Inclined member; 22. Discharge port; 23. Plugging plate; 24. Transverse moving plate; 2401. Inclined groove; 2402. Horizontal groove; 25. Grooved pulley; 26. Supporting part; 27. Second electric telescopic rod; 28. Guide member. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, and it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0045] Please refer to Figures 1 to 9 , in the embodiment of the present invention, the exhaust gas purification device includes a spray tower and multiple sets of spraying mechanisms arranged in a ring on the spray tower. The spraying mechanisms include: two sets of nozzles 1, a filter mesh plate 3, a knocking structure, and a pump pressure assembly.

[0046] Two groups of nozzles 1 are arranged inside the spray tower. A feed pipe 2 arranged outside the spray tower is connected to the nozzles 1. Specifically, the nozzles 1 are connected to the lower end of the side of the feed pipe 2. One end of the feed pipe 2 away from the nozzles 1 is provided with a discharge port 22. Specifically, the two feed pipes 2 connecting the two groups of nozzles 1 are connected through a connecting piece 12. And a feed pipe 4 and an air inlet pipe 5 are connected to the feed pipe 2. At the same time, a sealing plug plate 23 perpendicular to the central axis of the feed pipe 2 is slidably installed on the discharge port 22;

[0047] It should be noted that in this embodiment, the feed pipes 4 of the two groups of feed pipes 2 are both connected to the same electric direction 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 both connected to another electric direction control valve, which is responsible for controlling the flow direction of the gas. Through this setting, when supplying the absorption liquid and the compressed gas, the absorption liquid or the compressed gas can be selectively pumped into one of the two groups of feed pipes 2, so as to ensure the stability and accuracy of the flow direction of the absorption liquid and the compressed gas, and avoid the absorption liquid or the compressed gas moving towards 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, and ensuring the absorption effect of the atomized absorption liquid on the tail gas.

[0048] Please refer to Figures 6 to 8 , the two plug plates 23 arranged on the discharge port 22 are connected through an actuating structure, and the actuating structure can drive the plug plate 23 to act to change the conduction state of the discharge port 22;

[0049] The actuating structure includes a supporting part 26 fixedly connected to the connecting piece 12. A second electric telescopic rod 27 is fixedly installed on the supporting part 26. A cross-moving plate 24 is connected to the actuating end of the second electric telescopic rod 27. The cross-moving plate 24 is slidably connected to the supporting part 26 through a guiding member 28;

[0050] Two guiding grooves are symmetrically arranged on the cross-moving plate 24. A sheave 25 rotatably connected to the plug plate 23 can roll in the guiding grooves;

[0051] The guiding grooves include a horizontal groove 2402 arranged on the cross-moving plate 24 and an inclined groove 2401 connected to the horizontal groove 2402.

[0052] For the convenience of understanding, reference can be made to Figure 8As shown, in the initial state, only the right plugging plate 23 in the two groups of plugging plates 23 is in the plugging position of the corresponding discharge port 22. At this time, when the absorption liquid flows into the supply pipe 2 corresponding to the plugged discharge port 22, due to the blockage of the discharge port 22, the absorption liquid can only flow in the direction of the nozzle 1, effectively avoiding the overflow of the absorption liquid from the discharge port 22, thereby preventing the atomization effect from deteriorating due to the reduction of the pumping pressure of the absorption liquid, ensuring that the atomized absorption liquid can be fully mixed with the tail gas, and then improving the absorption effect. At the same time, the left plugging plate 23 is in a state of being misaligned with the corresponding group of discharge ports 22, so that the pump pressure assembly can act on the supply pipe 2 corresponding to the unplugged discharge port 22, prompting the scaling and clogging substances attached to the filter screen plate 3 in the supply pipe 2 to be discharged through the discharge port 22.

[0053] After a certain period of time in the above initial state, with the continuous flow of the absorption liquid, some scaling and clogging substances will gradually adhere to the filter screen plate 3. At this time, the second electric telescopic rod 27 will start and drive the transverse movement plate 24 to move horizontally. Under the cooperation of the sprocket 25 and the inclined groove 2401, the left plugging plate 23 moves downward, and then plugs the corresponding discharge port 22, so that the discharge ports 22 on the two groups of supply pipes 2 are both in the plugged state. At the same time, the electric direction control valve can switch the flow direction of the absorption liquid from one group of supply pipes 2 to the other group of supply pipes 2 and spray it out through the other group of nozzles 1. Moreover, in this state, the other electric direction control valve will pump compressed gas into the supply pipe 2 where the absorption liquid originally flowed, and press the residual absorption liquid in the supply pipe 2 into the nozzle 1 connected to it, so as to avoid waste caused by the outflow of the residual absorption liquid when the plugging plate 23 cooperating with the supply pipe 2 is opened, and ensure the full utilization of the absorption liquid.

[0054] When the absorption liquid in the supply pipe 2 is completely pressed into the nozzle 1, the second electric telescopic rod 27 will continue to operate. At this time, the right plugging plate 23 moves upward, so that the discharge port 22 on the supply pipe 2 matching it is in the conducting state. In this state, the knocking structure and the pump pressure assembly cooperate with each other to effectively remove the scaling and clogging substances 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 ensure the flow rate of the absorption liquid and its injection pressure.

[0055] With the above settings, in cooperation with the two groups of electric direction control valves and the two groups of sealing plates 23, during the process of switching the nozzle 1, firstly, it can ensure that the absorption liquid will not overflow, and ensure the pressure when the absorption liquid is sprayed towards the nozzle 1, so as to ensure the atomization effect of the absorption liquid and the absorption effect on the tail gas. Secondly, it can compress the absorption liquid remaining in the feed pipe 2 through which the absorption liquid originally flowed into the original nozzle 1, thereby avoiding waste caused by the outflow of the remaining absorption liquid when the sealing plate 23 cooperating with the feed pipe 2 is opened, ensuring the full utilization of the absorption liquid. Finally, the sealing plate 23 can be opened, and under the cooperation of the knocking structure and the pump pressure assembly, the scaling and blocking substances attached to the filter mesh plate 3 can be removed from the feed pipe 2. When the nozzle 1 is switched next time, the filter mesh plate 3 can maintain the best filtering effect and ensure the flow rate of the absorption liquid and its spraying pressure.

[0056] Please refer to Figure 5 , the filter mesh plate 3 is arranged inside the feed pipe 2;

[0057] The knocking structure is coaxially connected to the feed pipe 2, and the knocking structure can move towards the discharge port 22 to impact the filter mesh plate 3;

[0058] The knocking structure includes a telescopic shaft 7 that is hermetically and slidably arranged through the feed pipe 2. One end of the telescopic shaft 7 facing the filter mesh plate 3 is provided with a knocking head 6, and a limiting ring 701 is formed on the telescopic shaft 7;

[0059] 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 limiting ring 701, and the other end is connected to the inner wall of the feed pipe 2.

[0060] In the initial state, the first cylindrical spring 8 is in a natural and relaxed state. When the absorption liquid flows through the filter mesh plate 3, scale-like blocking substances 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 cylindrical spring 8 will be compressed. When the telescopic shaft 7 is released, the first cylindrical spring 8 will quickly return to its original state and release its elastic potential energy, driving the telescopic shaft 7 and the connected knocking head 6 to accelerate. Due to inertia, after the knocking head 6 moves to the original position, it will still continue to move towards the filter mesh plate 3 and collide with the filter mesh plate 3. This collision can effectively shake off the scale-like blocking substances adhering to the filter mesh plate 3, so that when the subsequent pump pressure assembly operates, as much scale-like blocking substances on the filter mesh plate 3 as possible can be removed, ensuring its cleaning effect and guaranteeing the normal filtering function of the filter mesh plate 3 and the spraying pressure of the absorption liquid.

[0061] Please refer to Figure 1 、 Figure 3, the pump pressure assembly is connected to one end of the feed pipe 2 away from the discharge port 22, and the pump pressure assembly can alternately pump compressed gas into two groups of the feed pipes 2 and trigger the knocking structure to act before pumping the compressed gas;

[0062] The pump pressure assembly includes a pump cylinder block 13 provided on two groups of the feed pipes 2. Two groups of one-way valves 14 with opposite conduction directions are provided at both ends of the pump cylinder block 13. One group of the one-way valves 14 is connected to the feed pipe 2 through a connecting pipe 15. The conduction direction of one group of the one-way valves 14 is: from the outside to the inside of the pump cylinder block 13, and the conduction direction of the other group of the one-way valves 14 is: from the inside of the pump cylinder block 13 towards the feed pipe 2;

[0063] A sealing plug 16 is also hermetically and slidably installed in the pump cylinder block 13, and the sealing plug 16 is connected to a connecting rod passing through the feed pipe 2;

[0064] The pump pressure assembly further includes a power structure for driving the sealing plug 16 and the telescopic shaft 7 to act. 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 provided on the feed pipe 2.

[0065] 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 connecting frame 17 connected thereto 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 block 13 away from the sealing plug 16. With the help of this negative pressure, external air can be sucked into the pump cylinder block 13. Subsequently, the first electric telescopic rod 18 will move rapidly in the reverse direction to compress the air sucked into the pump cylinder block 13. In this way, the compressed gas can enter the feed pipe 2 through the connecting pipe 15, and then the scale-like blockage substances remaining on one side of the filter screen plate 3 in the feed pipe 2 and shaken off by the knocking head 6 can be removed from the feed pipe 2, so as to ensure that when the subsequent absorption liquid passes through the filter screen plate 3 again, the filter screen plate 3 can play a better filtering effect.

[0066] Through the above settings, on the one hand, the knocking head 6 can be used to impact the filter screen plate 3, so that the scale-like blockage substances adhering to the filter screen plate 3 can be separated or loosened from the filter screen plate 3, avoiding the excessive adhesion between the scale-like blockage substances and the filter screen plate 3, which makes it difficult to be removed. On the other hand, by pumping compressed air, the scale-like blockage substances separated or loosened from the filter screen plate 3 can be better removed from the feed pipe 2. The combination of the two aspects makes the removal of the scale-like blockage substances more thorough, ensuring that when the absorption liquid flows through the filter screen plate 3 next time, the filter screen plate 3 can have the best filtering effect and ensuring the passing speed of the absorption liquid, and ensuring the pressure of the absorption liquid moving towards the nozzle 1.

[0067] See also Figures 3 to 5 , Figure 9 The 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;

[0068] 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;

[0069] 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.

[0070] 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.

[0071] 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.

[0072] With the above settings, when the first electric telescopic rod 18 operates, it can first trigger the telescopic shaft 7 and the knocking head 6 to impact the filter screen plate 3, so as to shake off the scale-like clogging substances adhering to the filter screen plate 3 or make them loose from the filter screen plate 3, and then pump compressed air to achieve the removal of the scale-like clogging substances, ensuring the removal effect.

[0073] Application of the exhaust gas purification equipment as described in the preparation of N, N-ethyl acrylate dimethylamine.

[0074] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0075] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments 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 spraying mechanisms arranged in a ring on the spray tower, characterized in that, The spraying mechanism includes: Two groups of nozzles (1), which are arranged inside the spray tower. A feed pipe (2) arranged outside the spray tower is connected to the nozzles (1). One end of the feed pipe (2) far away from the nozzles (1) is provided with a discharge port (22); A filter screen plate (3), which is arranged inside the feed pipe (2); A knocking structure, which is coaxially connected to the feed pipe (2). The knocking structure can move towards the discharge port (22) to impact the filter screen plate (3); A pump pressure component, which is connected to one end of the feed pipe (2) far away from the discharge port (22). The pump pressure component can alternately pump compressed gas into two groups of the feed pipes (2), and trigger the knocking structure to act before pumping the compressed gas; The knocking structure includes a telescopic shaft (7) that is hermetically and slidably arranged through the feed pipe (2). One end of the telescopic shaft (7) facing the filter screen plate (3) is provided with a knocking head (6), and a limiting 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 limiting ring (701), and the other end is connected to the inner wall of the feed pipe (2); The pump pressure component includes pump cylinder bodies (13) arranged on two groups of the feed pipes (2). Two groups of one-way valves (14) with opposite conduction directions are arranged at both ends of the pump cylinder body (13). 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 hermetically and slidably installed in the pump cylinder body (13). The sealing plug (16) is connected to a connecting rod that penetrates the feed pipe (2); The pump pressure component further includes a power structure for driving the sealing plug (16) and the telescopic shaft (7) to act; The power structure includes a connecting frame (17) fixedly connected to the connecting rod. The connecting frame (17) is connected to a first electric telescopic rod (18) arranged on the feed pipe (2); The 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) on the side far away from the moving direction of the sealing plug (16) performs a telescopic action once.

2. The exhaust gas purification device according to claim 1, characterized in that A feed pipe (4) and an air inlet pipe (5) are connected to the feed pipe (2), and a blocking plate (23) perpendicular to the central axis of the feed pipe (2) is hermetically and slidably installed on the discharge port (22); Two groups of the blocking plates (23) arranged on the discharge port (22) are connected through an execution structure. The execution structure can drive the blocking plate (23) to act to change the conduction state of the discharge port (22).

3. The tail 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) being fixedly mounted on the supporting portion (26), a transverse plate (24) being connected to an action end of the second electric telescopic rod (27), and the transverse plate (24) being slidably connected to the supporting portion (26) via a guide member (28); Two groups of guide grooves are symmetrically arranged on the transverse moving plate (24), and a groove wheel (25) rotatably connected to the blocking plate (23) can roll in the guide grooves; The guide groove comprises 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 device according to claim 1, 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 mounted in the slide groove (1701), and the connecting rod (19) is connected to the connecting frame (17) via a second cylindrical spring (20); The trigger kit further comprises a connecting plate (9) fixedly connected to the telescopic shaft (7), the connecting plate (9) being slidably connected to a guide member (10) provided 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.

5. The exhaust gas purification device according to claim 4, 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).

6. Use of the tail gas purification device according to any one of claims 1 to 5 in the preparation of ethyl N,N-dimethylaminoacrylate.

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