Spray absorption tower for ethyl acetate distillation tail gas

Abstract

The invention discloses a spraying absorption tower for ethyl acetate distillation tail gas, and relates to the technical field of waste gas treatment, the spraying absorption tower comprises a tower frame and a spraying treatment assembly mounted at the top of the tower frame, and a liquid discharge assembly is arranged at the bottom of the tower frame. When the device is used, waste liquid generated by spraying tail gas through absorption liquid is discharged into a liquid discharging box through a liquid injection pipe, when a camera shoots that the waste liquid is flush with a liquid level line, a PLC opens a first electromagnetic valve and starts a hydraulic rod, a piston plate is pushed to move, the waste liquid is pushed upwards, and gas is forced to flow upwards; and the waste liquid is discharged into the waste liquid collecting tower base through the air inlet and the air outlet pipe. When the hydraulic rod is automatically closed, the waste liquid is pushed into the air inlet hole, the high-resilience sealing ring moves to the top of the arc-shaped ring, and the waste liquid flows downwards through the liquid guide hole. Under the action of the liquid discharging assembly, gas is discharged back into the spraying treatment assembly to be treated while the waste liquid is discharged, so that the gas is prevented from being discharged to the outside to cause pollution.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, in particular to a spray absorption tower for ethyl acetate distillation tail gas. Background Art

[0002] Ethyl acetate distillation offgas refers to the volatile gas mixture separated through distillation during the production or purification of ethyl acetate. Ethyl acetate distillation offgas is an industrial waste gas containing volatile organic compounds (VOCs), which can pose a threat to human health and the environment. It must be treated to meet standards before it can be discharged. Liquid absorption is often used to treat ethyl acetate distillation offgas. A spray absorption tower sprays an absorption liquid, which comes into contact with the ethyl acetate distillation offgas. Through gas-liquid contact, pollutants in the offgas dissolve or react in the absorption liquid, thereby removing them.

[0003] In the prior art, waste liquid generated during use in a spray absorption tower for ethyl acetate distillation tail gas flows into a waste liquid tank at the bottom of the spray tower. When the waste liquid in the waste liquid tank reaches a certain volume, it needs to be promptly discharged to facilitate subsequent storage of new waste liquid. When the waste liquid in the waste liquid tank is nearly empty, some of the ethyl acetate distillation tail gas injected into the spray tower will be sucked into the drain pipe and discharged into the external environment along with the waste liquid. This part of the gas is directly discharged without being fully sprayed, which can easily pollute the atmospheric environment, reduce air quality, and affect the tail gas treatment effect.

[0004] Therefore, we propose a spray absorption tower for ethyl acetate distillation tail gas in order to solve the problems raised in the above background technology. Summary of the Invention

[0005] The object of the present invention is to provide a spray absorption tower for ethyl acetate distillation tail gas, so as to solve the problem proposed in the above-mentioned background technology that during the waste liquid discharge process of the spray absorption tower, when the waste liquid is close to being emptied, part of the tail gas will be sucked into the drain pipe and discharged to the external environment along with the waste liquid. This part of the gas is directly discharged without being fully sprayed, which is likely to cause pollution to the atmospheric environment, reduce air quality, and affect the tail gas treatment effect.

[0006] To achieve the above object, the present invention provides the following technical solution: a spray absorption tower for ethyl acetate distillation tail gas, comprising a tower frame and a spray treatment assembly mounted on the top of the tower frame, a drainage assembly being disposed at the bottom of the tower frame, a drainage assembly being disposed within the spray treatment assembly, and a PLC controller being disposed on the front surface of the tower top; The spray treatment assembly includes a waste liquid collection tower base, a spray absorption tower body is fixedly installed on the top of the waste liquid collection tower base, and two spray pipe networks are arranged inside the spray absorption tower body; The liquid drainage assembly comprises a liquid drainage tank and a hydraulic rod at the bottom of the liquid drainage tank, the top of the liquid drainage tank is provided with an air inlet hole, the top of the liquid drainage tank is fixedly connected with an air outlet pipe near the air inlet hole, the inside of the liquid drainage tank is movably embedded with a piston plate, the outer surface of the piston plate is fixedly connected with a high-rebound sealing ring, the piston plate and the high-rebound sealing ring are used to push the small amount of waste liquid remaining in the liquid drainage tank upwards, forcing the carried gas to be discharged back to the inside of the waste liquid collection tower through the air outlet pipe, avoiding the untreated gas from being discharged outward.

[0007] Preferably, the inner wall of the liquid drainage tank is fixedly installed with a guide contraction ring, the inner wall of the guide contraction ring is fixedly installed with an arc-shaped ring, the inner wall of the arc-shaped ring is provided with a plurality of liquid guide holes, the front surface of the liquid drainage tank is provided with an observation window, the outer surface of the observation window is provided with a liquid level line, the top of the outer surface of the liquid drainage tank is fixedly installed with a mounting plate, and the rear surface of the mounting plate is fixedly installed with a camera.

[0008] Preferably, the top end of the air outlet pipe is fixedly installed with a drip-proof cover, the outer surface of the air outlet pipe is provided with a first electromagnetic valve, the top end of the hydraulic rod is fixedly connected with the bottom of the piston plate, the bottom surface of the inside of the liquid drainage tank is fixedly installed with an inclined drainage plate, the center of the bottom of the liquid drainage tank and the center of the inclined drainage plate are both provided with sealing holes, the inner walls of the two sealing holes are both fixedly connected with sealing sleeves, and the outer surface of the top end of the hydraulic rod is in close contact with the inner walls of the two sealing sleeves.

[0009] Preferably, the edge of the top of the liquid drainage tank is fixedly connected with a liquid injection pipe, the bottom of the outer surface of the liquid drainage tank is fixedly connected with a waste liquid pipe, the bottom of the outer surface of the waste liquid collection tower is fixedly connected with a liquid outlet pipe, the outer surface of the liquid outlet pipe is provided with a second electromagnetic valve, one end of the liquid injection pipe is connected with one end of the liquid outlet pipe through a flange plate, and the top of the liquid drainage tank is fixedly connected with an air inlet pipe away from the liquid injection pipe.

[0010] Preferably, the outer surfaces of the waste liquid pipe and the air inlet pipe are both provided with electric valves, the bottom of the liquid drainage tank is fixedly installed with a chassis, the bottom end of the hydraulic rod is fixedly installed on the bottom surface of the chassis, and the top end of the air outlet pipe is fixedly penetrated through the tower to the inside of the waste liquid collection tower.

[0011] Preferably, the drainage assembly comprises a shunt cover, the outer surface of the shunt cover is provided with a plurality of air ports, the inside of the shunt cover is provided with a first flow guide plate, the bottom of the first flow guide plate is provided with a second flow guide plate, the bottom of the second flow guide plate is provided with a third flow guide plate, and the first flow guide plate, the second flow guide plate and the third flow guide plate form a stepped shape.

[0012] Preferably, an annular groove is provided inside the spray absorption tower body, a plurality of fixed pipes are fixedly connected to the bottom surface of the annular groove, a plurality of first arc-shaped holes are provided on the top surface of one side of the annular groove, a plurality of second arc-shaped holes are provided on the bottom surface of one side of the annular groove, and the bottom of the outer surface of the diverter hood is fixedly installed on the inner wall of the spray absorption tower body near the first arc-shaped holes.

[0013] Preferably, the bottom of the outer surface of the third guide plate is fixedly installed on the inner wall of the spray absorption tower body near the second arc-shaped hole, and a connecting frame is fixedly installed inside the first guide plate, the second guide plate and the third guide plate. One end of the connecting frame is fixedly installed at the center of the inner top surface of the diversion cover, and one end of the multiple fixed pipes are respectively fixed through the spray absorption tower body to the inside of the waste liquid collection tower base.

[0014] Preferably, a packing layer is provided inside the spray absorption tower body near the two spray pipe networks, a demister is provided on the top surface of the inside of the spray absorption tower body, a liquid pump is provided on the top of the waste liquid collection tower base, the input end of the liquid pump is connected to a liquid extraction pipe through a flange, the output end of the liquid pump is connected to a liquid delivery pipe through a flange, two connecting pipes are fixedly connected to the outer surface of the liquid delivery pipe, and a liquid level sensor is provided inside the waste liquid collection tower base.

[0015] Preferably, an air injection pipe is fixedly connected to the top of the outer surface of the waste liquid collection tower base, one end of the two spray pipe networks are fixedly passed through the outer surface of the spray absorption tower body, the bottom of the waste liquid collection tower base is fixedly installed on the top of the tower frame, and one end of the two connecting pipes is respectively connected to one end of the two spray pipe networks through flanges.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, the waste liquid generated by the exhaust gas after the absorption liquid spray treatment is discharged into the drainage box through the injection pipe. When the camera captures that the waste liquid is flush with the liquid level line, the PLC controller opens the first solenoid valve and starts the hydraulic rod to push the piston plate to move, pushing the waste liquid upward, forcing the gas to flow upward, and discharge it into the waste liquid collection tower base through the air inlet and the air outlet pipe for absorption liquid spray treatment. When the hydraulic rod is automatically closed, the waste liquid is pushed into the air inlet, the high-rebound sealing ring moves to the top of the arc ring, and the waste liquid flows downward onto the inclined drainage plate through the liquid guide hole. Under the action of the drainage component, while discharging the waste liquid, part of the gas sucked in is discharged back to the spray treatment component for treatment, which does not affect the waste liquid collection of the spray treatment component, and can also avoid discharging the gas to the outside during drainage, reducing air pollution, being beneficial to environmental protection, and improving the exhaust gas treatment effect.

[0017] 2, When the application is used, the ethyl acetate distillation tail gas is transported to the inside of the waste liquid collection tower base through the gas injection pipe, the tail gas flows from bottom to top, respectively passes through the first filler layer, the large aperture spraying pipe network, the second filler layer and the small aperture fine spraying pipe network, realizes double spraying treatment of the tail gas, the purified gas flows upward, passes through the demister through the flow guide assembly, removes the liquid drops in the clean gas, and finally is discharged from the tower top, and the waste liquid falls into the waste liquid collection tower base for storage. Meanwhile, the liquid level sensor detects the waste liquid, when the waste liquid amount exceeds the set maximum liquid level data, the PLC controller controls the second electromagnetic valve to open, and the waste liquid is transported to the liquid discharge assembly for liquid discharge and gas discharge prevention treatment.

[0018] 3, When the application is used, the liquid drops falling on the demister flow along the smooth inclined surface of the flow divider cover, flow into the annular groove through the first arc-shaped hole. The liquid drops falling from the gas port fall on the stepped inclined surface composed of the first flow guide plate, the second flow guide plate and the third flow guide plate and slide step by step, enter the annular groove through the second arc-shaped hole, and avoid vertical dropping. The liquid drops in the annular groove flow to the waste liquid collection tower base through the plurality of fixed pipes and mix together with the waste liquid. Under the action of the flow guide assembly, the liquid falling from the demister can be guided to the lower side, so that a large amount of liquid drops do not form a 'rain curtain' and drop downward, impact the spraying pipe network for many times, affect the stability of the spraying pipe network, and then affect the spraying effect of the absorption liquid. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a first angle perspective view of the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 2 It is a second angle perspective view of the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 3 It is a third angle perspective view of the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 4 It is a structural cross-sectional view of the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 5 It is a structural cross-sectional view of the spraying treatment assembly in the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 6 It is a structural development perspective view of the flow guide assembly in the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 7 It is a structural cross-sectional view of the flow divider cover in the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 8 It is a structural view of the first flow guide plate in the ethyl acetate distillation tail gas spraying absorption tower of the application; Figure 9This is a schematic cross-sectional view of the structure of a liquid drainage assembly in a spray absorption tower for ethyl acetate distillation tail gas according to the present invention; Figure 10 This is a schematic cross-sectional view of the structure of a drain tank in a spray absorption tower for ethyl acetate distillation tail gas according to the present invention; Figure 11 The present invention provides a schematic cross-sectional view of a portion of the structure of a guide shrinkage ring in a spray absorption tower for ethyl acetate distillation tail gas.

[0020] In the picture: 1. Tower; 2. Spray treatment assembly; 201. Waste liquid collection tower base; 202. Spray absorption tower body; 203. Liquid pump; 204. Liquid level sensor; 205. Liquid delivery pipe; 206. Connecting pipe; 207. Spray pipe network; 208. Air injection pipe; 209. Liquid outlet pipe; 210. Second solenoid valve; 211. Liquid extraction pipe; 212. Demister; 213. Packing layer; 214. Annular groove; 215. Fixed pipe; 216. First arc-shaped hole; 217. Second arc-shaped hole; 3. Drain assembly; 301. Drain box; 302. Liquid injection pipe; 303. Air inlet; 304. Air outlet pipe; 305. First solenoid valve; 306 , drip shield; 307, air inlet pipe; 308, waste liquid pipe; 309, electric valve; 310, inclined guide plate; 311, piston plate; 312, high rebound sealing ring; 313, base frame; 314, hydraulic rod; 315, guide shrink ring; 316, arc ring; 317, liquid guide hole; 318, sealing hole; 319, sealing sleeve; 320, mounting plate; 321, camera; 322, observation window; 323, liquid level line; 4, drainage assembly; 401, diversion cover; 402, air port; 403, first guide plate; 404, second guide plate; 405, third guide plate; 406, connecting frame; 5, PLC controller. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1-11As shown, the present invention provides a technical solution: a spray absorption tower for ethyl acetate distillation tail gas, comprising a tower frame 1 and a spray treatment component 2 installed on the top of the tower frame 1, a drainage component 3 is provided at the bottom of the tower frame 1, a drainage component 4 is provided inside the spray treatment component 2, and a PLC controller 5 is provided on the front surface of the top of the tower frame 1; the spray treatment component 2 comprises a waste liquid collection tower base 201, a spray absorption tower body 202 is fixedly installed on the top of the waste liquid collection tower base 201, and two spray pipe networks 207 are provided inside the spray absorption tower body 202; the drainage component 3 comprises a drainage box 301 and a hydraulic rod 314 at the bottom thereof, an air inlet 303 is opened on the top of the drainage box 301, and a hydraulic rod 314 is provided at the bottom ... top of the drainage box 301, and a hydraulic rod 314 is provided at the top of the drainage box 301, and a hydraulic rod 314 is provided at the bottom of the drainage box 301, and a hydraulic rod 314 is provided at the bottom of the drainage box 301, and a hydraulic rod The drain box 301 is connected to an air outlet pipe 304, and a piston plate 311 is movably embedded in the interior of the drain box 301. The outer surface of the piston plate 311 is fixedly connected to a high-rebound sealing ring 312. The piston plate 311 and the high-rebound sealing ring 312 are used to push the small amount of waste liquid remaining in the drain box 301 upward, forcing the carried gas to be discharged back to the interior of the waste liquid collection tower base 201 through the air outlet pipe 304, to prevent untreated gas from being discharged outward. A guide shrink ring 315 is fixedly installed on the inner wall of the drain box 301, and an arc ring 316 is fixedly installed on the inner wall of the guide shrink ring 315. A plurality of liquid guide holes 317 are opened on the inner wall of the arc ring 316. An observation window 322 is provided on the front surface of the drain box 301, and a liquid level line 316 is provided on the outer surface of the observation window 322. 23. A mounting plate 320 is fixedly installed on the top of the outer surface of the drain box 301, and a camera 321 is fixedly installed on the rear surface of the mounting plate 320. A drip shield 306 is fixedly installed on the top of the outlet pipe 304. A first solenoid valve 305 is provided on the outer surface of the outlet pipe 304. The top of the hydraulic rod 314 is fixedly connected to the bottom of the piston plate 311. An inclined guide plate 310 is fixedly installed on the bottom surface of the drain box 301. A sealing hole 318 is provided at the center of the inclined guide plate 310 and the bottom of the drain box 301. The inner walls of the two sealing holes 318 are fixedly connected with sealing sleeves 319. The outer surface of the top of the hydraulic rod 314 fits with the inner walls of the two sealing sleeves 319. The edge of the top of the drain box 301 is fixedly connected It is connected to a liquid injection pipe 302, a waste liquid pipe 308 is fixedly connected to the bottom of the outer surface of the drainage box 301, a liquid outlet pipe 209 is fixedly connected to the bottom of the outer surface of the waste liquid collection tower base 201, a second solenoid valve 210 is provided on the outer surface of the liquid outlet pipe 209, one end of the liquid injection pipe 302 is connected to one end of the liquid outlet pipe 209 through a flange, and an air intake pipe 307 is fixedly connected to the top of the drainage box 301 away from the liquid injection pipe 302, and electric valves 309 are provided on the outer surfaces of the waste liquid pipe 308 and the air intake pipe 307, a base frame 313 is fixedly installed at the bottom of the drainage box 301, the bottom end of the hydraulic rod 314 is fixedly installed on the bottom surface of the base frame 313, and the top end of the air outlet pipe 304 is fixed through the tower frame 1 to the inside of the waste liquid collection tower base 201.

[0023] In this embodiment, during use, the liquid pump 203, liquid level sensor 204, second solenoid valve 210, first solenoid valve 305, electric valve 309, hydraulic rod 314, camera 321, and PLC controller 5 are electrically connected. When the spray treatment assembly 2 performs liquid spray treatment on the ethyl acetate distillation tail gas, it cooperates with the liquid level sensor 204 to monitor the changes in the waste liquid volume in real time. When the waste liquid volume is excessive, the PLC controller 5 controls the second solenoid valve 210 to open, draining the waste liquid into the drain tank 301 through the liquid outlet pipe 209 and the liquid injection pipe 302. When the waste liquid is completely discharged, the second solenoid valve 210 is closed and the electric valve 309 at the waste liquid pipe 308 is opened. Simultaneously, some of the tail gas in the waste liquid collection tower 201 is drawn into the drain tank 301 along with a small amount of discharged waste liquid. The waste liquid falls to the top of the piston plate 311, and the gas is located between the waste liquid and the internal top surface of the drain tank 301. After the electric valve 309 at the waste liquid pipe 308 is opened, the waste liquid on top of the piston plate 311 is discharged through the waste liquid pipe 308, and the amount of waste liquid inside the drain tank 301 gradually decreases. The camera 321 is activated in advance, and the liquid level changes inside the drain tank 301 are captured through the observation window 322. The captured image is transmitted to the PLC controller 5 for identification and analysis. When the waste liquid surface is aligned with the liquid level line 323, the PLC controller 5 controls the hydraulic rod 314 to activate and open the first solenoid valve 305. The output end of the hydraulic rod 314 pushes the piston plate 311 and the high-rebound sealing ring 312 upward, pushing the waste liquid upward and forcing the gas above the waste liquid to flow upward. The electric valve 309 at the air inlet pipe 307 is closed, allowing the gas to enter the air outlet pipe 304 only through the air inlet hole 303, and finally discharged into the waste liquid collection tower base 201, flowing from bottom to top, for the absorption liquid spraying process. The top of the air outlet pipe 304 is relatively high, higher than the highest liquid level of the waste liquid inside the waste liquid collection tower seat 201. As the hydraulic rod 314 continues to push, the waste liquid is gradually pushed to the top surface inside the drain box 301. When the hydraulic rod 314 is automatically closed, the waste liquid is pushed into the air inlet 303, thereby discharging the gas in the drain box 301 into the waste liquid collection tower seat 201, and then the first solenoid valve 305 is closed. At this time, the gas sucked into the drain box 301 is discharged to the inside of the spray treatment component 2 again, avoiding the subsequent discharge of a small amount of waste liquid and the discharge of the gas together. The bottom surface of the inner wall of the guide shrinkage ring 315 is wedge-shaped, and the inner wall of the arc ring 316 is arc-shaped, such as Figure 11As shown, when the piston plate 311 moves upward, it drives the high-resilience seal ring 312 to gradually move to the guide shrink ring 315. The guide shrink ring 315 squeezes the high-resilience seal ring 312, causing it to deform and shrink. The slightly shrunk high-resilience seal ring 312 then moves into the arc ring 316, where it is squeezed again and shrinks. When the hydraulic rod 314 automatically closes, the waste liquid is pushed into the air inlet 303. The bottom of the high-resilience seal ring 312 moves to the top of the liquid guide hole 317 on the inner wall of the arc ring 316, creating a flow space between the outer surface of the high-resilience seal ring 312 and the inner wall of the drain box 301. At this time, the waste liquid at the top of the piston plate 311 flows into the space between the arc ring 316 and the guide shrink ring 315, and flows downward through the multiple liquid guide holes 317 to the inclined guide plate 310. Under the drainage effect of the inclined guide plate 310, it is discharged through the waste liquid pipe 308. Under the action of the drainage component 3, part of the gas sucked in is discharged back to the spray treatment component 2 for treatment while the waste liquid is discharged, which does not affect the waste liquid collection of the spray treatment component 2. It can also avoid discharging the gas to the outside during drainage, reducing air pollution, which is beneficial to environmental protection and improving the exhaust gas treatment effect. It solves the problem that when the waste liquid is discharged from the spray absorption tower, when the waste liquid is close to being emptied, part of the exhaust gas will be sucked into the drainage pipe and discharged to the external environment together with the waste liquid. This part of the gas is directly discharged without sufficient spray treatment, which is easy to pollute the atmospheric environment, reduce air quality, and affect the exhaust gas treatment effect.

[0024] Example 2: Figures 1-8 As shown, the spray treatment component 2 includes a waste liquid collection tower base 201, a spray absorption tower body 202 is fixedly installed on the top of the waste liquid collection tower base 201, two spray pipe networks 207 are arranged inside the spray absorption tower body 202, and a packing layer 213 is arranged near the two spray pipe networks 207 inside the spray absorption tower body 202. A demister 212 is arranged on the top surface of the spray absorption tower body 202, and a liquid pump 203 is arranged on the top of the waste liquid collection tower base 201. The input end of the liquid pump 203 is connected to a liquid extraction pipe 211 through a flange. The output end of the liquid pump 203 is connected to the liquid extraction pipe 211 through a flange. The outlet end is connected to a liquid delivery pipe 205 through a flange, and the outer surface of the liquid delivery pipe 205 is fixedly connected to two connecting pipes 206. A liquid level sensor 204 is arranged inside the waste liquid collection tower base 201, and an air injection pipe 208 is fixedly connected to the top of the outer surface of the waste liquid collection tower base 201. One end of the two spray pipe networks 207 is fixedly passed through the outer surface of the spray absorption tower body 202. The bottom of the waste liquid collection tower base 201 is fixedly installed on the top of the tower frame 1, and one end of the two connecting pipes 206 is respectively connected to one end of the two spray pipe networks 207 through a flange.

[0025] In this embodiment, when in use, one end of the liquid extraction pipe 211 is connected to the external absorption liquid storage tank, and one end of the gas injection pipe 208 is connected to the gas injection device. The pre-treated ethyl acetate distillation tail gas is transported to the interior of the waste liquid collection tower base 201 through the gas injection pipe 208, and the tail gas flows from bottom to top into the interior of the spray absorption tower body 202. The interior of the spray absorption tower body 202 is respectively composed of the first packing layer 213, the large-aperture spray pipe network 207, the second packing layer 213, the small-aperture fine spray pipe network 207, the drainage component 4 and the demister 212, as shown in FIG. Figure 4 As shown. Start the liquid pump 203 in advance, and suck the absorption liquid into the liquid delivery pipe 205 through the liquid extraction pipe 211. Then, it is transported to the large-aperture spray pipe network 207 and the small-aperture fine spray pipe network 207 through two connecting pipes 206, and the absorption liquid is evenly sprayed into fine droplets. When the tail gas flows, it first passes through the first packing layer 213 to increase the gas-liquid contact area and prolong the residence time. Then, the absorption liquid sprayed down by the large-aperture spray pipe network 207 contacts the rising air flow in the opposite direction, and performs the initial absorption treatment on the tail gas. Then, the absorption liquid sprayed from the second packing layer 213 and the small-aperture fine spray pipe network 207 undergoes secondary treatment. The purified gas flows upward, flows through the demisting device 212 through the drainage component 4, removes the droplets in the clean gas, and is finally discharged from the top of the tower. The absorption waste liquid falls into the waste liquid collection tower base 201 for storage. At the same time, the liquid level sensor 204 detects the amount of waste liquid in the waste liquid collection tower 201. The maximum and minimum liquid level data for the waste liquid are pre-set in the PLC controller 5. The liquid level sensor 204 transmits the detected liquid level data to the PLC controller 5 via an electrical signal for identification and comparison. When the amount of waste liquid exceeds the set maximum liquid level data, the PLC controller 5 controls the second solenoid valve 210 to open, transferring the waste liquid to the drain assembly 3 for drainage and gas prevention. When the waste liquid is nearly drained, the second solenoid valve 210 is closed.

[0026] Example 3: Figures 1-4 and Figure 6As shown, the drainage component 4 includes a diverter cover 401, a plurality of air ports 402 are provided on the outer surface of the diverter cover 401, a first guide plate 403 is provided inside the diverter cover 401, a second guide plate 404 is provided at the bottom of the first guide plate 403, a third guide plate 405 is provided at the bottom of the second guide plate 404, the first guide plate 403, the second guide plate 404 and the third guide plate 405 form a stepped shape, an annular groove 214 is provided inside the spray absorption tower body 202, a plurality of fixed pipes 215 are fixedly connected to the bottom surface of the annular groove 214, a plurality of first arc holes 216 are provided on the top surface of one side of the annular groove 214, a plurality of second arc holes 217 are provided on the bottom surface of one side of the annular groove 214, and the bottom of the outer surface of the diverter cover 401 is fixedly mounted on the spray absorption tower body 20 2 is located near the first arc-shaped hole 216, and the bottom of the outer surface of the third guide plate 405 is fixedly installed on the inner wall of the spray absorption tower body 202 near the second arc-shaped hole 217. A connecting frame 406 is fixedly installed inside the first guide plate 403, the second guide plate 404 and the third guide plate 405, and one end of the connecting frame 406 is fixedly installed at the center of the inner top surface of the diverter cover 401. One end of multiple fixed pipes 215 are respectively fixed through the spray absorption tower body 202 to the interior of the waste liquid collection tower base 201. The spray treatment component 2 includes a waste liquid collection tower base 201, and the spray absorption tower body 202 is fixedly installed on the top of the waste liquid collection tower base 201. Two spray pipe networks 207 are arranged inside the spray absorption tower body 202, and a demister 212 is arranged on the top surface of the interior of the spray absorption tower body 202.

[0027] In this embodiment, during use, the ethyl acetate distillation tail gas, after being sprayed with the absorption liquid, flows upward through the space between the first guide plate 403, the second guide plate 404, and the third guide plate 405, and continues to move through the plurality of air ports 402, passing through the demister 212 to remove droplets from the gas. After prolonged use in the demister 212, the droplets aggregate into large droplets, which, under the action of gravity, drip downward. At this point, the large droplets fall onto the top of the diverter hood 401, flow along the smooth inclined surface of the diverter hood 401, and flow through the plurality of first arc-shaped holes 216 into the annular groove 214. When the droplets flow along the smooth surface of the diverter hood 401, if they accidentally fall downward from the air ports 402, they may land on the surface of the first guide plate 403, the second guide plate 404, or the third guide plate 405. The first guide plate 403, the second guide plate 404, and the third guide plate 405 are arranged vertically to form a stepped shape, so that the droplets on the surface slide down step by step along the stepped inclined surface and enter the annular groove 214 through the multiple second arc-shaped holes 217, thereby preventing vertical dripping. The droplets in the annular groove 214 flow into the waste liquid collection tower base 201 through the multiple fixed pipes 215 and mix with the waste liquid. Under the action of the drainage component 4, the liquid dripping from the demister 212 can be drained downward, preventing a large amount of droplets from forming a "rain curtain" and dripping downward, causing multiple impacts on the spray pipe network 207, affecting the stability of the spray pipe network 207, and thus affecting the spraying effect of the absorption liquid.

[0028] The effect and working principle achieved by the entire mechanism are as follows: the tail gas from ethyl acetate distillation is transported to the inside of the waste liquid collection tower base 201 through the gas injection pipe 208, the liquid pump 203 is started in advance, the absorption liquid is sucked into the liquid delivery pipe 205 through the liquid extraction pipe 211, and is respectively transported to the large-aperture spray pipe network 207 and the small-aperture fine spray pipe network 207 through two connecting pipes 206, so that the absorption liquid is evenly sprayed into fine droplets. The exhaust gas flows upward through the first packing layer 213, followed by the absorption liquid sprayed down from the large-aperture spray network 207, which contacts the rising airflow in the opposite direction, undergoing primary absorption treatment on the exhaust gas. It then passes through the second packing layer 213 and the small-aperture fine spray network 207 for secondary treatment. The purified gas flows upward through the spaces between the first guide plate 403, the second guide plate 404, and the third guide plate 405, and continues to move through multiple air ports 402. It passes through the demister 212 to remove liquid droplets from the gas, and is finally discharged from the top of the tower. The absorbed waste liquid falls into the waste liquid collection tower base 201 for storage. After long-term use in the demister 212, the droplets aggregate to form large droplets. Under the action of gravity, these droplets drip downward to the top of the diverter hood 401 and flow through multiple first arc-shaped holes 216 into the annular groove 214. Liquid droplets accidentally falling from the air port 402 slide down the stepped surface formed by the first guide plate 403, the second guide plate 404, and the third guide plate 405, enter the annular groove 214 through the multiple second arc-shaped holes 217, and finally flow into the waste liquid collection tower 201 through the multiple fixed pipes 215, where they mix with the waste liquid. The liquid level sensor 204 detects the amount of waste liquid in the waste liquid collection tower 201. When the waste liquid exceeds the set maximum liquid level, the PLC controller 5 controls the second solenoid valve 210 to open, draining the waste liquid into the drain tank 301 through the liquid outlet pipe 209 and the liquid injection pipe 302. When all the waste liquid is discharged, the second solenoid valve 210 is closed, and the electric valve 309 on the waste liquid pipe 308 is opened to discharge the waste liquid through the waste liquid pipe 308. Camera 321 is activated in advance. When the waste liquid surface is aligned with liquid level line 323, PLC controller 5 activates hydraulic rod 314 and opens first solenoid valve 305. Hydraulic rod 314 pushes piston plate 311 upward, pushing the waste liquid upward and forcing gas to flow upward through air inlet 303 and into air outlet pipe 304. Gas is then discharged into waste liquid collection tower 201, flowing from bottom to top, undergoing absorption liquid spraying. When hydraulic rod 314 automatically closes, the waste liquid is pushed into air inlet 303, and first solenoid valve 305 closes. The upward movement of piston plate 311 drives high-resilience seal 312 from guide shrink ring 315 to arc ring 316.When the hydraulic rod 314 is automatically closed, the bottom of the high-rebound sealing ring 312 moves to the top of the liquid guide hole 317 on the inner wall of the arc ring 316. At this time, the waste liquid flows into the space between the arc ring 316 and the guide shrink ring 315, and flows downward through the multiple liquid guide holes 317 to the inclined guide plate 310. Under the drainage action of the inclined guide plate 310, the waste liquid is discharged through the waste liquid pipe 308.

[0029] Among them, the liquid pump 203, the liquid level sensor 204, the second solenoid valve 210, the defogger 212, the first solenoid valve 305, the electric valve 309, the hydraulic rod 314, the camera 321 and the PLC controller 5 are all existing technologies, and their components and usage principles are all public technologies, so no further explanation will be given here.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A spray absorption tower for ethyl acetate distillation tail gas, comprising a tower frame (1) and a spray treatment assembly (2) mounted on the top of the tower frame (1), characterized in that: A drainage assembly (3) is provided at the bottom of the tower (1), a drainage assembly (4) is provided inside the spray treatment assembly (2), and a PLC controller (5) is provided on the front surface of the top of the tower (1); The spray treatment assembly (2) comprises a waste liquid collection tower base (201), a spray absorption tower body (202) is fixedly mounted on the top of the waste liquid collection tower base (201), and two spray pipe networks (207) are arranged inside the spray absorption tower body (202); The drainage assembly (3) comprises a drainage box (301) and a hydraulic rod (314) at the bottom thereof; an air inlet (303) is provided at the top of the drainage box (301); an air outlet pipe (304) is fixedly connected to the top of the drainage box (301) near the air inlet (303); a piston plate (311) is movably embedded in the interior of the drainage box (301); a high-rebound sealing ring (312) is fixedly connected to the outer surface of the piston plate (311); the piston plate (311) and the high-rebound sealing ring (312) are used to push a small amount of waste liquid remaining in the drainage box (301) upward, forcing the carried gas to be discharged back into the waste liquid collection tower base (201) through the air outlet pipe (304), thereby preventing untreated gas from being discharged outward.

2. the spray absorption tower of ethyl acetate distillation tail gas according to claim 1, is characterized in that: A guide shrink ring (315) is fixedly mounted on the inner wall of the drainage box (301), an arcuate ring (316) is fixedly mounted on the inner wall of the guide shrink ring (315), and a plurality of liquid guide holes (317) are provided on the inner wall of the arcuate ring (316). An observation window (322) is provided on the front surface of the drainage box (301), and a liquid level line (323) is provided on the outer surface of the observation window (322). A mounting plate (320) is fixedly mounted on the top of the outer surface of the drainage box (301), and a camera (321) is fixedly mounted on the rear surface of the mounting plate (320).

3. the spray absorption tower of ethyl acetate distillation tail gas according to claim 2 is characterized in that: A drip-proof cover (306) is fixedly installed at the top of the air outlet pipe (304), a first solenoid valve (305) is provided on the outer surface of the air outlet pipe (304), the top of the hydraulic rod (314) is fixedly connected to the bottom of the piston plate (311), an inclined guide plate (310) is fixedly installed on the bottom surface of the drainage box (301), a sealing hole (318) is opened at the center of the inclined guide plate (310) and the bottom of the drainage box (301), the inner walls of the two sealing holes (318) are fixedly connected to the inner walls of the two sealing sleeves (319), and the outer surface of the top of the hydraulic rod (314) is in contact with the inner walls of the two sealing sleeves (319).

4. the spray absorption tower of ethyl acetate distillation tail gas according to claim 3 is characterized in that: A liquid injection pipe (302) is fixedly connected to the edge of the top of the liquid drainage box (301), a waste liquid pipe (308) is fixedly connected to the bottom of the outer surface of the liquid drainage box (301), a liquid outlet pipe (209) is fixedly connected to the bottom of the outer surface of the waste liquid collection tower base (201), a second solenoid valve (210) is provided on the outer surface of the liquid outlet pipe (209), one end of the liquid injection pipe (302) is connected to one end of the liquid outlet pipe (209) via a flange, and an air inlet pipe (307) is fixedly connected to the top of the liquid drainage box (301) away from the liquid injection pipe (302).

5. the spray absorption tower of ethyl acetate distillation tail gas according to claim 4 is characterized in that: Electric valves (309) are provided on the outer surfaces of the waste liquid pipe (308) and the air inlet pipe (307); a base frame (313) is fixedly mounted on the bottom of the liquid discharge box (301); the bottom end of the hydraulic rod (314) is fixedly mounted on the bottom surface of the base frame (313); and the top end of the air outlet pipe (304) is fixedly passed through the tower frame (1) to the interior of the waste liquid collection tower base (201).

6. the spray absorption tower of ethyl acetate distillation tail gas according to claim 1, is characterized in that: The diversion assembly (4) comprises a diversion cover (401), the outer surface of the diversion cover (401) is provided with a plurality of air ports (402), a first guide plate (403) is provided inside the diversion cover (401), a second guide plate (404) is provided at the bottom of the first guide plate (403), and a third guide plate (405) is provided at the bottom of the second guide plate (404), and the first guide plate (403), the second guide plate (404) and the third guide plate (405) form a stepped shape.

7. The spray absorption tower for ethyl acetate distillation tail gas according to claim 6, wherein: An annular groove (214) is provided inside the spray absorption tower body (202), a plurality of fixed pipes (215) are fixedly connected to the bottom surface of the annular groove (214), a plurality of first arc-shaped holes (216) are provided on the top surface of one side of the annular groove (214), a plurality of second arc-shaped holes (217) are provided on the bottom surface of one side of the annular groove (214), and the bottom of the outer surface of the diverter hood (401) is fixedly mounted on the inner wall of the spray absorption tower body (202) near the first arc-shaped holes (216).

8. The spray absorption tower for ethyl acetate distillation tail gas according to claim 7, wherein: The bottom of the outer surface of the third guide plate (405) is fixedly mounted on the inner wall of the spray absorption tower body (202) near the second arc-shaped hole (217), and a connecting frame (406) is fixedly mounted inside the first guide plate (403), the second guide plate (404) and the third guide plate (405). One end of the connecting frame (406) is fixedly mounted at the center of the inner top surface of the diverter cover (401), and one end of the plurality of fixed pipes (215) is fixedly mounted to pass through the spray absorption tower body (202) to the inside of the waste liquid collection tower base (201).

9. The spray absorption tower for ethyl acetate distillation tail gas according to claim 1, wherein: A packing layer (213) is provided inside the spray absorption tower body (202) near the two spray pipe networks (207), a demister (212) is provided on the top surface of the spray absorption tower body (202), a liquid pump (203) is provided on the top of the waste liquid collection tower base (201), an input end of the liquid pump (203) is connected to a liquid extraction pipe (211) via a flange, an output end of the liquid pump (203) is connected to a liquid delivery pipe (205) via a flange, an outer surface of the liquid delivery pipe (205) is fixedly connected to two connecting pipes (206), and a liquid level sensor (204) is provided inside the waste liquid collection tower base (201).

10. The spray absorption tower for ethyl acetate distillation tail gas according to claim 9, wherein: An air injection pipe (208) is fixedly connected to the top of the outer surface of the waste liquid collection tower base (201), one end of each of the two spray pipe networks (207) is fixedly passed through the outer surface of the spray absorption tower body (202), the bottom of the waste liquid collection tower base (201) is fixedly installed on the top of the tower frame (1), and one end of each of the two connecting pipes (206) is connected to one end of each of the two spray pipe networks (207) via a flange.

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