Solvent collecting and processing device

Abstract

The utility model provides a solvent collecting and processing device, which belongs to the technical field of solvent recovery and comprises a solvent collecting tower and a solvent separating tank. The solvent collecting tower is provided with a tower top, a spraying tower section, a slow flow tower section and a gas inlet tower section, the bottom of the gas inlet tower section is connected with a liquid collecting hopper, and the bottom of the liquid collecting hopper is connected with a liquid discharging pipe; the liquid collecting hopper and the liquid discharging pipe are arranged in the solvent separating tank; two partition plates are arranged in the solvent separation tank in parallel and divide the solvent separation tank into a saline water tank, a liquid mixing tank and a solvent tank; a brine outlet is formed in the lower part of the side wall of the brine tank and is connected with a circulating brine pipe through a brine pump, and the circulating brine pipe is communicated with the first spraying pipe; a solvent outlet is formed in the side wall of the solvent tank and is connected with a solvent recovery tank through a solvent pump. The device can automatically separate an organic solvent from saline water, has a good separation effect and a good recovery effect, reduces the loss of the organic solvent, and reduces the waste gas treatment cost and the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of solvent recovery, in particular to a solvent collection and processing device. Background Art

[0002] Waste gas is generated during production processes in industries such as chemical, pharmaceutical, printing, coating, and packaging. This waste gas contains volatile organic compounds (VOCs) such as alkanes, olefins, aromatics, esters, alcohols, aldehydes, and ketones. Directly discharging these organic waste gases into the atmosphere will inevitably pollute the atmosphere and surrounding environment. With socioeconomic development, environmental issues are becoming increasingly important, and waste gas treatment is receiving increasing attention from manufacturers, including chemical companies. Exhaust gas is typically absorbed and purified using a variety of organic solvents with specific absorptive properties, depending on its composition. This method not only absorbs and purifies harmful substances in the waste gas but also recovers the organic matter in the waste gas, making it widely used in industry. However, waste gas often has a high temperature. Upon contact with the organic solvent, some of the organic solvent vaporizes, which is then discharged along with the purified waste gas. To avoid wasting this organic solvent and prevent the gaseous organic solvent from being discharged into the atmosphere with the waste gas and causing atmospheric pollution, it is necessary to recover the vaporized organic solvent. However, existing solvent recovery towers require large amounts of water during the recovery process, consuming significant amounts of energy. Furthermore, water and some organic solvents are miscible, resulting in poor separation between the two. This poor solvent recovery process results in significant organic solvent loss and increased production costs. Therefore, how to quickly, effectively, safely, and reliably recover organic solvents from waste gas to reduce production costs and minimize environmental pollution has become an urgent challenge. Utility Model Content

[0003] The utility model provides a solvent collection and treatment device that is fast, effective, safe, reliable, reduces production costs, and reduces environmental pollution. It is used to solve the problems in the prior art of poor separation and recovery of organic solvents in waste gas, large organic solvent loss, and increased waste gas treatment costs and production costs.

[0004] Specifically, the utility model provides a solvent collection and processing device, comprising: a solvent collection tower and a solvent separation tank arranged vertically and interconnected internally; the solvent collection tower is provided with a tower top, a spray tower section, a slow flow tower section and an air intake tower section in order from top to bottom, the bottom of the air intake tower section is connected to a liquid collecting bucket, and the bottom of the liquid collecting bucket is connected to a liquid downpipe; the liquid collecting bucket and the liquid downpipe are arranged inside the solvent separation tank; an exhaust gas outlet is provided at the top of the tower top; an air inlet is provided on the air intake tower section, and the air inlet is connected to an exhaust gas pipe; a first spray pipe is provided at the top of the spray tower section, and a plurality of spray nozzles are provided on the first spray pipe; A packing section is provided in the slow flow tower section; two partitions are arranged in parallel in the solvent separation tank, which divide the solvent separation tank into a brine tank, a mixed liquid tank and a solvent tank; a downpipe is arranged in the middle mixed liquid tank; a drain port is provided at the bottom of the partition close to the brine tank, and an overflow port is provided at the upper part of the partition close to the solvent tank; a brine outlet is provided at the lower part of the side wall of the brine tank, and a cooling coil is also provided in the brine tank. The brine outlet is connected to the circulating brine pipe through a brine pump, and the circulating brine pipe is connected to the first spray pipe; a solvent outlet is provided on the side wall of the solvent tank, and the solvent outlet is connected to the solvent recovery tank through a solvent pump.

[0005] Preferably, a second spray pipe is provided at the bottom of the spray tower section, a plurality of spray nozzles are provided on the second spray pipe, the second spray pipe is connected to a water supply pipe provided outside the spray tower section, and a water supply valve is provided on the water supply pipe.

[0006] Preferably, the spray nozzles on the first spray pipe and the second spray pipe are staggered in the longitudinal position.

[0007] Preferably, a first liquid level gauge is provided in the brine tank; a second liquid level gauge is provided in the solvent tank; the first liquid level gauge and the second liquid level gauge are both electrically connected to the controller; and the controller is also electrically connected to the brine pump, the water replenishment valve and the solvent pump.

[0008] Preferably, the packing section in the slow flow tower section is filled with packing made of corrosion-resistant material.

[0009] Preferably, a guide section is further provided below the packing section of the slow flow tower section; the guide section includes at least two layers of guide plates; the guide plates are corrugated; one end of the guide plate is fixed to the inner wall of the slow flow tower section, and the other end of the guide plate is a free end; the two adjacent layers of guide plates are staggered in the longitudinal position.

[0010] Preferably, a plurality of guide holes with axes parallel to the axis of the solvent collection tower are evenly opened on the guide plate; the guide holes include a same-diameter section and an expanded-diameter section opened coaxially, the same-diameter section is arranged above the expanded-diameter section, and the diameter of the same-diameter section is the same as the diameter of the necking end of the expanded-diameter section.

[0011] Preferably, a demisting screen is provided below the tail gas outlet at the top of the tower.

[0012] The solvent collection and treatment device provided by the utility model liquefies the organic solvent in the waste gas by utilizing low-temperature brine, thereby reducing the difficulty of separation. By utilizing the fact that the organic solvent and the low-temperature brine are immiscible, the organic solvent and the brine are separated by solubility and specific gravity in a mixing tank, and then a discharge port is set according to the height difference of the liquid level to achieve the purpose of automatic stratification and separation of the brine and the organic solvent. No external power is required during the separation period, the separation effect is good, and the recovery effect of the organic solvent is excellent. The device can recycle and utilize the organic solvent in the high-temperature waste gas at a rate of up to 90%, which can reduce air pollution, save the consumption of organic solvents, and also reduce the waste gas treatment cost and production cost.

[0013] The slow-flow tower section in the device increases the gas-liquid contact time by utilizing the filler of the packing section and the guide plate of the guide section, prolongs the residence time of the waste gas in the slow-flow tower section, makes the cooling and liquefaction of the organic solvent more complete, and collects and guides the droplets of the organic solvent, which helps to improve the recovery effect of the organic solvent.

[0014] The device has a simple structural design, reduces the difficulty of production, occupies a small space, collects volatile organic solvents by condensation method, ensures production safety, prevents and controls environmental pollution, recycles and reuses the brine and organic solvents therein, reduces production costs, and is applicable to a variety of organic solvent recovery occasions, has a wide range of applications, and has promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic structural diagram of a solvent collection and processing device provided in one embodiment of the present invention;

[0017] Figure 2 A schematic structural diagram of a solvent collection and processing device provided in another embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of a slow flow tower section provided in one embodiment of the present utility model.

[0019] Description of reference numerals:

[0020] 1. Solvent collection tower, 2. Solvent separation tank, 3. Controller, 11. Tower top, 12. Spray tower section, 13. Slow flow tower section, 14. Inlet tower section, 15. Liquid collecting hopper, 16. Downpipe, 21. Partition, 22. Brine tank, 23. Mixing tank, 24. Solvent tank, 111. Exhaust gas outlet, 112. Demisting screen, 121. First spray pipe, 122. Second spray pipe, 123 , water supply pipe, 124, water supply valve, 131, packing section, 132, guide section, 133, guide plate, 134, guide hole, 141, air inlet, 211, drain port, 212, overflow port, 221, brine pump, 222, cooling coil, 223, circulating brine pipe, 224, first liquid level gauge, 241, solvent pump, 242, solvent recovery tank, 243, second liquid level gauge. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of the present invention.

[0022] like Figure 1 The utility model provides a solvent collection and processing device, comprising: a solvent collection tower 1 and a solvent separation tank 2 arranged up and down and internally interconnected; the solvent collection tower 1 is provided with a tower top 11, a spray tower section 12, a slow flow tower section 13 and an air intake tower section 14 in sequence from top to bottom, the bottom of the air intake tower section 14 is connected to a liquid collecting bucket 15, and the bottom of the liquid collecting bucket 15 is connected to a liquid down pipe 16; the liquid collecting bucket 15 and the liquid down pipe 16 are arranged inside the solvent separation tank 2; the top of the tower top 11 is provided with an exhaust gas outlet 111; the air intake tower section 14 is provided with an air inlet 141, and the air inlet 141 is connected to an exhaust gas pipe; the top of the spray tower section 12 is provided with a first spray pipe 121, and the first spray pipe 121 is provided with a plurality of spray nozzles; the slow flow tower section 13 is provided with a Filling section 131; two partitions 21 are arranged in parallel in the solvent separation tank 2, and the partitions 21 divide the solvent separation tank 2 into a brine tank 22, a mixed liquid tank 23 and a solvent tank 24; the downpipe 16 is arranged in the middle mixed liquid tank 23; a drain port 211 is provided at the bottom of the partition 21 close to the brine tank 22, and an overflow port 212 is provided at the upper part of the partition 21 close to the solvent tank 24; a brine outlet is provided at the lower part of the side wall of the brine tank 22, and a cooling coil 222 is also provided in the brine tank 22, and the brine outlet is connected to the circulating brine pipe 223 through a brine pump 221, and the circulating brine pipe 223 is connected to the first spray pipe 121; a solvent outlet is provided on the side wall of the solvent tank 24, and the solvent outlet is connected to the solvent recovery tank 242 through a solvent pump 241.

[0023] The brine and circulating brine used in the solvent recovery process are low temperature, so the brine is usually made of sodium chloride or calcium chloride solution to ensure that the brine will not freeze at low temperatures. Other brine that will not freeze at low temperatures can also be used, and the present invention does not limit this. The brine is cooled by the cooling coil 222 provided in the brine tank 22, and the brine after cooling can cool the waste gas entrained with organic solvents in the spray tower section 12 and the slow flow tower section 13, and can quickly reduce the temperature of the waste gas and the organic solvent, so that the organic solvent in the waste gas is cooled and liquefied, and the liquefaction and recovery process of the organic solvent is promoted, so that it falls into the liquid collecting hopper 15 for preliminary solvent recovery. The air inlet 141 on the air inlet tower section 14 can be connected to an air inlet pipe extending to the interior of the tower section. The specific structure is not limited here, and those skilled in the art can set it according to the common structure in this field.

[0024] The principle of separating brine and organic solvent is that organic solvent is insoluble in low-temperature brine. Therefore, they can be separated in the mixing tank 23 by solubility and specific gravity, and then the discharge port is set according to the height difference of the liquid level to achieve the purpose of automatic stratification and separation of brine and organic solvent. Therefore, the liquid level in the mixing tank 23 must ensure that there is a certain height difference from the stratification layer of brine and organic solvent to the overflow port 212 of the organic solvent.

[0025] The waste gas containing organic solvents enters the air intake tower section 14 from the waste gas pipe through the air inlet 141. As the waste gas flows upward, it comes into contact with the low-temperature circulating brine sprayed from the first spray pipe 121 and the spray nozzle of the spray tower section 12 in the filler section 131 of the slow flow tower section 13. In the filler, it comes into contact with the waste gas containing organic solvents, and the organic solvent is cooled and liquefied. The liquefied organic solvent falls into the liquid collecting hopper 15 under the action of gravity. After the waste gas continues to enter the spray tower section 12, it is further cooled and replaced by the circulating brine sprayed from the first spray pipe 121 and the spray nozzle. The brine replaces or entrains the organic solvent therein, so that the organic solvent is separated from the waste gas, further reducing the organic solvent in the waste gas. After multiple solvent recovery, the waste gas is finally discharged from the waste gas outlet 111 at the top of the tower 11 to the subsequent treatment process. After the brine and organic solvent fall into the liquid collecting hopper 15, they are uniformly fed into the mixing tank 23 of the solvent separation tank 2 through the downpipe 16. The mixed brine and organic solvent are separated into layers at a relatively low temperature based on differences in solubility and specific gravity, resulting in a good separation effect. The organic solvent in the upper layer enters the solvent tank 24 through the overflow port 212 on the partition 21, while the brine in the lower layer enters the brine tank 22 through the drain port 211 on the partition 21. After the organic solvent in the solvent tank 24 reaches a certain accumulated volume, it is discharged to the solvent recovery tank 242 via the solvent pump 241 and can be reused in the production process, thereby achieving effective recovery of the organic solvent and achieving a good recovery effect. The brine in the brine tank 22 is cooled by the cooling coil 222 and then sent to the brine pump 221 through the brine outlet. Then, it is sent to the first spray pipe 121 through the circulating brine pipe 223 for circulation and spraying. When in use, the above-described device can automatically separate the organic solvent and brine, achieving excellent separation and recovery effects, reducing organic solvent loss, waste gas treatment costs, and production costs.

[0026] like Figure 2 Preferably, a second spray pipe 122 is provided at the bottom of the spray tower section 12. The second spray pipe 122 is equipped with multiple spray nozzles. The second spray pipe 122 is connected to a water replenishment pipe 123 provided outside the spray tower section 12. The water replenishment pipe 123 is equipped with a water replenishment valve 124. Brine is inevitably lost during use and needs to be replenished through the water replenishment pipe 123 and the second spray pipe 122. The separate first and second spray pipes 121 and 122 provide two types of brine with different temperatures and concentrations, thereby providing two different absorption efficiencies for the organic solvent in the exhaust gas, which helps improve the efficiency and effectiveness of organic solvent recovery.

[0027] Preferably, the spray nozzles on the first spray pipe 121 and the second spray pipe 122 are staggered in the longitudinal direction. This staggered arrangement of the spray nozzles on the first spray pipe 121 and the second spray pipe 122 can expand the coverage area of the brine in the spray tower section 12 and the slow flow tower section 13, thereby improving the organic solvent recovery and treatment effect. It should be noted that the technical solution of the present invention does not limit the specific structure of the spray pipes and spray nozzles. Those skilled in the art can select a spray pipe and spray nozzle structure commonly used in the art based on actual working conditions.

[0028] Preferably, a first liquid level gauge 224 is provided in the brine tank 22; a second liquid level gauge 243 is provided in the solvent tank 24; both the first liquid level gauge 224 and the second liquid level gauge 243 are electrically connected to the controller 3; the controller 3 is also electrically connected to the brine pump 221, the water replenishment valve 124, and the solvent pump 241. When the first liquid level gauge 224 in the brine tank 22 detects that the liquid level exceeds or falls below the set value, the controller 3 activates the brine pump 221 to discharge the liquid, or opens the water replenishment valve 124 to replenish the brine. When the second liquid level gauge 243 in the solvent tank 24 detects that the liquid level exceeds the set value, the controller 3 activates the solvent pump 241 to discharge the recovered organic solvent into the solvent recovery tank 242, facilitating its reuse in the production process.

[0029] like Figure 2 and Figure 3 Preferably, the packing section 131 in the slow flow tower section 13 is filled with packing made of corrosion-resistant material. The packing can increase the contact area and contact time of the gas-liquid two phases, so that the organic solvent can be fully cooled and liquefied, and collect and fall on the packing. Since the organic solvents and brine components entrained in the waste gas in chemical production are diverse, in order to extend the service life of the device, it is preferred that the packing section 131 adopts packing made of corrosion-resistant material. The specific packing type can be selected according to the working conditions. Examples include but are not limited to stainless steel, PP balls, ceramic rings, etc., and the structure of the packing section 131 is not limited in the present invention, and the conventional structure setting in the field can be adopted. It should be noted that the technical solution of the present invention includes at least one layer of packing section 131, but the present invention does not limit the number of layers of the packing section 131. Those skilled in the art can set the number of layers according to the actual working conditions.

[0030] Preferably, a guide section 132 is further provided below the filling section 131 of the slow flow tower section 13; the guide section 132 includes at least two layers of guide plates 133; the guide plates 133 are corrugated; one end of the guide plate 133 is fixedly connected to the inner wall of the slow flow tower section 13, and the other end of the guide plate 133 is a free end; the two adjacent layers of guide plates 133 are staggered in the longitudinal position. The adjacent staggered guide plates 133 allow the exhaust gas to form an S-shaped flow path during the upward process, thereby increasing its residence time in the slow flow tower section 13, making the cooling and liquefaction of the organic solvent more complete, and helping to improve the recovery effect of the organic solvent. The corrugated guide plates 133 allow the exhaust gas to contact and collide at different angles on the guide plates 133, which can break up the exhaust gas and the organic solvent, increase its cooling and cooling rate, and facilitate the collection and diversion of the liquefied organic solvent.

[0031] Preferably, guide plate 133 is uniformly provided with multiple guide holes 134, each with its axis parallel to the axis of solvent collection tower 1. These guide holes 134 include a coaxially arranged uniform diameter section and an expanded diameter section, with the uniform diameter section positioned above the expanded diameter section and having the same diameter as the constricted end of the expanded diameter section. The provision of guide holes 134 prevents eddy currents caused by the narrowing of the exhaust gas flow path and also allows for full contact between the exhaust gas and the sprayed brine within guide plate 133 and guide holes 134, thereby further improving the amount and effectiveness of organic solvent recovery.

[0032] like Figure 2 A demisting screen 112 is provided below the tail gas outlet of the tower top 11. The demisting screen 112 is used to intercept the liquid entrained in the exhaust gas to prevent the discharged exhaust gas from entraining brine or organic solvent droplets.

[0033] The solvent collection and treatment device provided by the present invention is designed to operate so that waste gas carrying organic solvents enters the air intake tower section 14 from the waste gas pipe through the air inlet 141. As the waste gas flows upward, it is guided by the guide plate 133 in the slow-flow tower section 13, forming an S-shaped flow path. This increases its residence time in the slow-flow tower section 13, allowing the organic solvent to be cooled and liquefied more fully. At the same time, the waste gas will come into contact with the circulating brine, and the liquefied organic solvent droplets and brine will gather and fall on the guide plate 133. Continuing upward, the waste gas will come into contact with the low-temperature circulating brine sprayed from the first spray pipe 121 and the spray nozzle of the spray tower section 12 in the packing section 131 of the slow-flow tower section 13. In the packing, the waste gas will come into contact with the waste gas carrying organic solvents, cooling and liquefying the organic solvent. The liquefied organic solvent will fall into the liquid collecting hopper 15 under the action of gravity.

[0034] After the waste gas continues to move upward into the spray tower section 12, it is further cooled and replaced under the action of the circulating brine sprayed from the first spray pipe 121 and the spray nozzle. The brine replaces or entrains the organic solvent therein, so that the organic solvent is separated from the waste gas, further reducing the organic solvent in the waste gas. After multiple solvent recovery, the waste gas passes through the demisting screen 112 and is finally discharged from the waste gas outlet 111 at the top of the tower 11 to the subsequent treatment process.

[0035] After the brine and organic solvent fall into the liquid collecting hopper 15, they all enter the mixing tank 23 of the solvent separation tank 2 from the downpipe 16. The mixed brine and organic solvent are separated into layers at a lower temperature according to differences in solubility and specific gravity. The organic solvent in the upper layer enters the solvent tank 24 through the overflow port 212 on the partition 21, and the brine in the lower layer enters the brine tank 22 through the drain port 211 on the partition 21. The brine in the brine tank 22 is cooled by the cooling coil 222 and then sent to the brine pump 221 through the brine outlet. Then, it is sent to the first spray pipe 121 through the circulating brine pipe 223 for circulation and spraying. During this period, when the first liquid level gauge 224 in the brine tank 22 detects data exceeding or falling below the liquid level set value, the controller 3 starts the brine pump 221 for discharge, or opens the water replenishment valve 124 to replenish brine. The replenished brine enters the second spray pipe 122 through the water supply pipe 123 and is finally sprayed out through the spray nozzle thereon, which can provide two brine with different temperatures and concentrations, thereby providing two absorption efficiencies for the organic solvent in the exhaust gas, which is beneficial to improving the recovery efficiency and effect of the organic solvent.

[0036] When the organic solvent in the solvent tank 24 reaches a certain accumulated amount, when the second liquid level gauge 243 in the solvent tank 24 detects a liquid level height exceeding the set value, the solvent pump 241 is started by the controller 3, and the solvent is discharged to the solvent recovery tank 242 through the solvent pump 241 and can be reused in the production process.

[0037] It should be noted that the detailed structure of some devices is not described in detail in this utility model, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. In addition, the parts not described in this device are the same as the prior art or can be implemented by using the prior art.

[0038] It should be noted that pressure sensors, flow meters or temperature sensors are installed on the conveying pipelines inside the device between different units and equipment. Different valves are also installed, such as pressure relief valves, pressure regulating valves, safety valves, etc., which are used to adjust and stabilize the pressure of the entire device. The opening of the valve can also be adjusted to adjust the material flow in the pipeline.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solvent collection and processing device, characterized in that: include: A solvent collection tower and a solvent separation tank are arranged vertically and internally interconnected; the solvent collection tower is provided with a tower top, a spray tower section, a slow flow tower section and an air intake tower section in order from top to bottom, the bottom of the air intake tower section is connected to a liquid collecting hopper, and the bottom of the liquid collecting hopper is connected to a liquid downpipe; the liquid collecting hopper and the liquid downpipe are arranged inside the solvent separation tank; the top of the tower top is provided with an exhaust gas outlet; the air intake tower section is provided with an air inlet, and the air inlet is connected to an exhaust gas pipe; the top of the spray tower section is provided with a first spray pipe, and the first spray pipe is provided with a plurality of spray nozzles; the slow flow tower section is provided with a packing section; Two partitions are arranged in parallel in the solvent separation tank, and the partitions divide the solvent separation tank into a brine tank, a mixed liquid tank and a solvent tank; the downpipe is arranged in the middle mixed liquid tank; a drain port is provided at the bottom of the partition close to the brine tank, and an overflow port is provided at the upper part of the partition close to the solvent tank; a brine outlet is provided at the lower part of the side wall of the brine tank, and a cooling coil is also provided in the brine tank. The brine outlet is connected to a circulating brine pipe through a brine pump, and the circulating brine pipe is connected to the first spray pipe; a solvent outlet is provided on the side wall of the solvent tank, and the solvent outlet is connected to a solvent recovery tank through a solvent pump.

2. The solvent collection and processing device according to claim 1, characterized in that: A second spray pipe is provided at the bottom of the spray tower section, a plurality of spray nozzles are provided on the second spray pipe, the second spray pipe is connected to a water supply pipe provided outside the spray tower section, and a water supply valve is provided on the water supply pipe.

3. The solvent collection and processing device according to claim 2, characterized in that: The spray nozzles on the first spray pipe and the second spray pipe are staggered in longitudinal position.

4. The solvent collection and processing device according to claim 2, characterized in that: A first liquid level gauge is provided in the brine tank; a second liquid level gauge is provided in the solvent tank; the first liquid level gauge and the second liquid level gauge are both electrically connected to a controller; and the controller is also electrically connected to the brine pump, the water replenishment valve and the solvent pump.

5. The solvent collection and processing device according to claim 1, characterized in that: The packing section in the slow flow tower section is filled with packing made of corrosion-resistant material.

6. The solvent collection and processing device according to any one of claims 1 to 5, characterized in that: A guide section is also provided below the filler section of the slow flow tower section; the guide section includes at least two layers of guide plates; the guide plates are corrugated; one end of the guide plate is fixedly connected to the inner wall of the slow flow tower section, and the other end of the guide plate is a free end; the guide plates of two adjacent layers are staggered in the longitudinal position.

7. The solvent collection and processing device according to claim 6, characterized in that: The guide plate is evenly provided with a plurality of guide holes whose axes are parallel to the axis of the solvent collection tower; the guide holes include a same-diameter section and an expanded-diameter section that are coaxially provided, the same-diameter section is arranged above the expanded-diameter section, and the diameter of the same-diameter section is the same as the diameter of the narrowed end of the expanded-diameter section.

8. The solvent collection and processing device according to claim 1, characterized in that: A demisting screen is provided below the tail gas outlet at the top of the tower.

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