Purification tower for chemical production based on isopropyl isocyanate

Abstract

The invention relates to the technical field of waste gas purification, in particular to an isopropyl isocyanate-based purification tower for chemical production, which comprises a purification tower, an exhaust pipe and the like, a round hole is formed in the purification tower; a first gas cavity is formed in the purification tower, and the round hole is communicated with the first gas cavity; and an exhaust pipe is mounted on the purification tower. Waste gas is sprayed out from each first gas tank and directly impacts the activated carbon fiberboard, so that the waste gas is prevented from escaping from the exhaust pipe without being filtered, and the waste gas treatment effect of equipment is improved; pulverized powder attached to the surface of the activated carbon fiberboard is scraped off through a filter screen, the situation that the activated carbon fiberboard is blocked by the powder and waste gas filtration is affected is avoided, the cleaning effect of the equipment on the activated carbon fiberboard is improved, and meanwhile the disengaged pulverized powder is intercepted; the first gas groove is blocked through the baffle, the activated carbon fiberboard can be replaced without shutdown, and meanwhile, poisoning caused by suction of waste gas during maintenance of workers is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas purification, and particularly to a purification tower for chemical production based on isopropyl isocyanate. Background Art

[0002] During the processing of isopropyl isocyanate, waste gas is easily generated, and this waste gas is often toxic. Therefore, it needs to be filtered by waste gas filtration equipment before being discharged to the outside, to avoid polluting the environment and preventing workers from inhaling the waste gas and getting poisoned. Activated carbon fiber boards belong to one of the waste gas filtration methods, using their small pore gaps to intercept harmful particles in the waste gas to achieve the filtration effect. In the prior art, the activated carbon fiber boards are placed in the tower in a stacked manner, and the waste gas passes through each layer of activated carbon fiber boards from top to bottom to achieve filtration. This method results in the largest filtration pressure on the first layer of activated carbon fiber boards. When the waste gas passes through the activated carbon fiber boards in sequence, the utilization rate of the activated carbon fiber boards in contact with the waste gas is lower and lower. At the same time, the activated carbon fiber boards that first come into contact with the waste gas are extremely easy to be blocked and need to be replaced frequently. When the waste gas flows between two activated carbon fiber boards, although the above problems are avoided, the waste gas is difficult to actively pass through the activated carbon fiber boards, and some waste gas is easily directly discharged along the flow channel, resulting in poor waste gas filtration effect.

[0003] At the same time, due to the high flexibility but poor compressive resistance of the activated carbon fiber boards, during the long-term use of the activated carbon fiber boards, under the long-term scouring of the dynamic waste gas flow, the surface of the activated carbon fiber boards is easily pulverized to produce powder. This will cause the pulverized and fallen powder to be discharged together with the purified waste gas, polluting the external environment. Further, the pulverized powder attached to the surface of the activated carbon fiber boards is also easily blocked in the small holes on the activated carbon fiber boards, affecting the filtration ability of the activated carbon fiber boards.

[0004] In summary, the present application proposes a purification tower for chemical production based on isopropyl isocyanate to improve the above-mentioned technical problems. Summary of the Invention

[0005] In order to overcome the disadvantages of uneven filtration efficiency, easy blockage, secondary pollution caused by material pulverization, and decline in filtration ability in the prior art of using stacked activated carbon fiber boards to filter waste gas, the present invention provides a purification tower for chemical production based on isopropyl isocyanate.

[0006] Technical solution: A purification tower for chemical production based on isopropyl isocyanate, comprising a purification tower, an exhaust pipe, and an activated carbon fiber board; circular holes are provided on the purification tower; a first air chamber is arranged inside the purification tower, and the circular holes are communicated with the first air chamber; an exhaust pipe is installed on the purification tower; a number of activated carbon fiber boards are equidistantly distributed from top to bottom inside the purification tower; it further comprises a partition board, a flow splitting board, and a cleaning component; a number of partition boards are fixedly connected to the left part of the inner side of the purification tower; a number of first rotating plates are rotatably connected between every two adjacent partition boards; a cleaning component for cleaning the pulverized powder of the activated carbon fiber board is slidably connected inside the purification tower; a number of flow splitting boards for enabling the waste gas to fully contact the activated carbon fiber board are arranged on the cleaning component, and the flow splitting boards are arranged in a hollow shape; a number of first air grooves are opened on each flow splitting board; each flow splitting board is located between two activated carbon fiber boards.

[0007] Further description, in the above purification tower for chemical production based on isopropyl isocyanate, the cleaning component comprises a guiding frame, an air extraction pipe, an air inlet pipe, a sliding plate, a sliding rail, and an electric slider; a number of guiding frames are fixedly connected to the right part of the inner side of the purification tower; a number of second rotating plates are rotatably connected between every two adjacent guiding frames; a second air chamber is jointly formed between all the guiding frames, the second rotating plates, and the purification tower; an air extraction pipe for cleaning the pulverized powder of the activated carbon fiber board is communicated with the upper right part of the purification tower, and the air extraction pipe is connected to an external air extraction device, and the air extraction device is connected to a collection bag; a number of air inlet pipes are communicated with the purification tower, and all the air inlet pipes are connected to an external air pumping device; each air inlet pipe is located between two adjacent flow splitting boards; a sliding plate is slidably connected to the right side of each flow splitting board through a spring; a second air groove is opened on the right side of each flow splitting board; each sliding plate covers the adjacent second air groove; a number of sliding rails are fixedly connected inside the purification tower; an electric slider is slidably connected to each sliding rail; every two front and rear opposite electric sliders are jointly fixedly connected to the corresponding flow splitting board.

[0008] Further description, in the above purification tower for chemical production based on isopropyl isocyanate, it further comprises a filter screen; a number of filter screens for preventing the pulverized powder of the activated carbon fiber board from flowing out to the outside are connected to the upper side and the lower side of each flow splitting board.

[0009] Further description, the frame of each filter screen is coated with rubber.

[0010] Further description, an anti-adhesion coating is applied to the inner wall of each flow splitting board.

[0011] Further description, a diaphragm is arranged between each electric slider and the purification tower.

[0012] Further description, each first air groove is inclined to the right.

[0013] Further explanation: In the above purification tower for chemical production based on isopropyl isocyanate, there are also tie rods and baffles; in front of each activated carbon fiber board, there is a tie rod fixedly connected for facilitating workers to draw out the activated carbon fiber board for maintenance; each activated carbon fiber board is detachably connected to the purification tower; in each flow dividing plate, there is a baffle slidably connected through a spring to prevent waste gas from overflowing; each baffle slides left and right in the adjacent flow dividing plate; several third air grooves are formed in each baffle.

[0014] Further explanation: In the above purification tower for chemical production based on isopropyl isocyanate, there are also electromagnets; several electromagnets for improving the cleaning effect of the equipment on the pulverized powder of the activated carbon fiber board are fixedly connected to the upper side of each flow dividing plate; each filter screen is rotatably connected to the adjacent flow dividing plate, and one end of the filter screen frame far from the flow dividing plate is made of magnetic material; several limiting grooves are arranged on each flow dividing plate; a stopper is arranged on the rotating shaft of each filter screen, and each stopper is located in the adjacent limiting groove.

[0015] Further explanation: A sealing strip is arranged between each activated carbon fiber board and the purification tower.

[0016] The beneficial effects of the present invention are as follows: The present invention realizes that by making the waste gas spray out from each first air groove and directly impact the activated carbon fiber board, the waste gas actively flows towards the activated carbon fiber board, preventing the waste gas from escaping from the exhaust pipe without being filtered, and improving the treatment effect of the equipment on the waste gas; The pulverized powder attached to the surface of the activated carbon fiber board is scraped off by the filter screen, avoiding the powder from blocking the activated carbon fiber board and affecting the waste gas filtration, improving the cleaning effect of the equipment on the activated carbon fiber board, and at the same time, the filter screen can also intercept the falling pulverized powder; By using the baffle to block the first air groove, the activated carbon fiber board can be replaced without stopping the machine, and at the same time, it avoids workers inhaling waste gas and getting poisoned during maintenance, improving the protection ability of the equipment for workers; By controlling the power-off of the electromagnet, the flowing of the air flow can carry away the pulverized powder on each filter screen, improving the cleaning ability of the equipment on the pulverized powder. Description of the Drawings

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the purification tower for chemical production based on isopropyl isocyanate of the present invention; Figure 2 It is a sectional view of the purification tower of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the combination of the filter screen and the slide plate of the present invention; Figure 4 It is a front view of the exhaust pipe, the partition plate and the flow dividing plate of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the combination of the flow dividing plate, the slide rail and the electric slider of the present invention; Figure 6 Front view of the flow splitter plate, guiding frame and exhaust pipe of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of area A in Figure 8 Side view of the flow splitter plate and sliding plate of the present invention; Figure 9 Schematic three-dimensional structure diagram of the pull rod of the present invention; Figure 10 Schematic three-dimensional structure diagram of the combination of the filter screen, baffle plate and electromagnet of the present invention; Figure 11 Diagram of the storage state of the baffle plate of the present invention; Figure 12 Side view of the flow splitter plate and filter screen of the present invention.

[0018] In the above drawings: 1 - purification tower, 1001 - round hole, 1002 - first air cavity, 1003 - second air cavity, 2 - exhaust pipe, 3 - partition plate, 3001 - first rotating plate, 4 - flow splitter plate, 4001 - first air groove, 4002 - second air groove, 4003 - limiting groove, 5 - activated carbon fiber board, 101 - guiding frame, 10101 - second rotating plate, 102 - exhaust pipe, 103 - intake pipe, 104 - filter screen, 10401 - stopper, 105 - sliding plate, 106 - slide rail, 107 - electric slider, 201 - pull rod, 202 - baffle plate, 20201 - third air groove, 203 - electromagnet. Detailed implementation manners

[0019] The present invention will be further described below in conjunction with the drawings and specific implementation manners.

[0020] Embodiment 1 As Figures 1-8 shown, a purification tower for chemical production based on isopropyl isocyanate includes a purification tower 1, an exhaust pipe 2 and an activated carbon fiber board 5; a round hole 1001 is provided on the purification tower 1; a first air cavity 1002 is provided inside the purification tower 1, and the round hole 1001 is communicated with the first air cavity 1002; an exhaust pipe 2 is installed on the purification tower 1; a plurality of activated carbon fiber boards 5 are equidistantly distributed from top to bottom inside the purification tower 1; It further includes a partition plate 3, a flow splitter plate 4 and a cleaning component; a plurality of partition plates 3 are fixedly connected to the left part inside the purification tower 1; two first rotating plates 3001 are rotatably connected between every two adjacent partition plates 3; a cleaning component is slidably connected inside the purification tower 1; a plurality of flow splitter plates 4 are provided on the cleaning component, and the flow splitter plate 4 is set to be hollow; a plurality of first air grooves 4001 are opened on each flow splitter plate 4; each flow splitter plate 4 is located between two activated carbon fiber boards 5.

[0021] The cleaning component includes a guiding box 101, an air extraction pipe 102, an air inlet pipe 103, a sliding plate 105, a sliding rail 106 and an electric slider 107; several guiding boxes 101 are fixedly connected to the right inner part of the purification tower 1; two second rotating plates 10101 are rotatably connected between every two adjacent guiding boxes 101; a second air cavity 1003 is jointly formed among all the guiding boxes 101, the second rotating plates 10101 and the purification tower 1; the right upper part of the purification tower 1 is communicated with an air extraction pipe 102, and the air extraction pipe 102 is connected to an external air extraction device, and the air extraction device is connected to a collection bag; several air inlet pipes 103 are communicated with the purification tower 1, and each air inlet pipe 103 is jointly connected to an external air pumping device; each air inlet pipe 103 is located between two adjacent flow dividing plates 4; a sliding plate 105 is slidably connected to the right side of each flow dividing plate 4 through a spring; a second air groove 4002 is formed on the right side of each flow dividing plate 4; each sliding plate 105 covers the adjacent second air groove 4002; several sliding rails 106 are fixedly connected inside the purification tower 1; an electric slider 107 is slidably connected to each sliding rail 106; every two front and rear opposite electric sliders 107 are jointly fixedly connected to the corresponding flow dividing plate 4.

[0022] It further includes a filter screen 104; several filter screens 104 are connected to the upper side and the lower side of each flow dividing plate 4.

[0023] The frame of each filter screen 104 is coated with rubber to prevent the filter screen 104 from scratching the activated carbon fiber board 5 and ensure the filtering effect of the activated carbon fiber board 5.

[0024] The inner wall of each flow dividing plate 4 is coated with an anti-adhesion coating to reduce the situation that the powdered activated carbon fiber board 5 adheres to the inside of the flow dividing plate 4 and facilitate the flow of air.

[0025] A diaphragm is arranged between each electric slider 107 and the purification tower 1.

[0026] Each first air groove 4001 is inclined to the right, which can ensure that the waste gas flows towards the activated carbon fiber board 5 while avoiding the direct impact of the air flow on the activated carbon fiber board 5 and reducing the damage of the air flow to the activated carbon fiber board 5.

[0027] After connecting the external pipeline to the circular hole 1001, the waste gas is introduced into the circular hole 1001 and the first air cavity 1002 through this pipeline. Subsequently, the waste gas is filtered under the interception of the activated carbon fiber board 5, and finally the filtered waste gas is discharged through the exhaust pipe 2.

[0028] In the prior art, activated carbon fiber boards 5 are stacked and arranged from top to bottom, and the waste gas passes through each activated carbon fiber board 5 from bottom to top to complete filtration. This will result in the greatest filtration pressure on the activated carbon fiber board 5 that first contacts the waste gas. When the waste gas passes through the activated carbon fiber boards 5 in sequence, the utilization rate of the activated carbon fiber boards 5 that contact the waste gas later is lower. At the same time, the activated carbon fiber board 5 that first contacts the waste gas is extremely prone to blockage and needs to be replaced frequently, affecting the waste gas purification efficiency. Therefore, taking the front-to-back view as the reference, the activated carbon fiber boards 5 are installed at equal intervals from top to bottom in the manner shown in Figure 2 . After the waste gas enters the first air chamber 1002 through the round holes 1001, it flows from left to right and finally is discharged through the exhaust pipe 2, so that the waste gas travels between every two activated carbon fiber boards 5, enabling each activated carbon fiber board 5 to fully filter the waste gas and avoiding the phenomenon that the activated carbon fiber boards 5 contact the waste gas successively. When the waste gas is filtered while traveling between two adjacent activated carbon fiber boards 5, the waste gas is likely to directly flow along the gap between the two activated carbon fiber boards 5 to the exhaust pipe 2, that is, the waste gas is directly discharged without passing through the activated carbon fiber board 5. Therefore, by arranging a plurality of partition plates 3 in the purification tower 1 and using the partition plates 3 and the first rotating plate 3001 to block the first air chamber 1002, the waste gas is prevented from flowing to the exhaust pipe 2 through the first air chamber 1002. Subsequently, all the electric sliders 107 are started to slide leftward on the slide rails 106, thereby driving all the flow dividing plates 4 to move leftward. The left side of the flow dividing plate 4 is used to push open the first rotating plate 3001 to the state shown in Figure 2 . Since the flow dividing plate 4 is arranged in a hollow shape, the waste gas is only allowed to enter each flow dividing plate 4 under the blockage of the partition plate 3. At this time, the waste gas enters a narrower flow channel, and at the same time, the intake volume of the waste gas is increased, so the flow rate of the waste gas is accelerated. Subsequently, the waste gas is ejected from each first air groove 4001 and then sprayed onto each activated carbon fiber board 5, causing the waste gas to actively flow towards the activated carbon fiber board 5, thereby filtering and purifying the waste gas, avoiding the waste gas being directly discharged from the exhaust pipe 2 along the gap between the two activated carbon fiber boards 5, improving the treatment effect of the equipment on the waste gas. At the same time, under the restriction and guidance of the flow dividing plate 4 and the first air groove 4001, the waste gas evenly flows onto the surface of each activated carbon fiber board 5, allowing the waste gas to fully contact each area of the activated carbon fiber board 5, improving the utilization rate of the activated carbon fiber board 5, and avoiding some areas of the activated carbon fiber board 5 losing the filtration function in advance.

[0029] When the activated carbon fiber board 5 is used for a long time to filter and purify the waste gas, due to the high flexibility but poor compressive resistance of the activated carbon fiber board 5, under the continuous flow and scouring of the waste gas, the surface of the activated carbon fiber board 5 gradually pulverizes and generates granular exfoliates. This will cause the pulverized and exfoliated powder to be discharged from the exhaust pipe 2 together with the purified waste gas, causing environmental pollution to the outside. Therefore, after the activated carbon fiber board 5 is used to filter the waste gas for a period of time, first stop introducing the waste gas into the purification tower 1, and then control all the electric sliders 107 to slide rightward, thereby driving all the flow dividing plates 4 to move rightward to the state shown inFigure 7 As shown, all the second rotating plates 10101 are pushed open. During the process of the sliding plate 105 moving following the flow dividing plate 4, it is blocked by the guiding frame 101 and cannot continue to move rightward, thus opening the second air groove 4002, and enabling the second air groove 4002 to communicate with the second air cavity 1003. At this time, an external air pumping device is controlled to start sending gas into each intake pipe 103, and then an external air extraction device starts to extract air from the extraction pipe 102, so that the extraction pipe 102 extracts the gas in the second air cavity 1003. Since each intake pipe 103 is located between two adjacent flow dividing plates 4, that is, after the air flow enters from the intake pipe 103, it flows horizontally along the surface of the flow dividing plate 4, so that the gas in the first air cavity 1002 enters the flow dividing plate 4 through the first air groove 4001, and finally flows from the flow dividing plate 4 into the second air cavity 1003 and is extracted. During this process, external gas continuously enters the first air cavity 1002 from the intake pipe 103, and thus the powdered powder on each activated carbon fiber plate 5 is extracted. Finally, the powder is extracted into the collection bag by the air extraction device, avoiding the powder being directly discharged to the outside and ensuring that the environment is not polluted. Further, a diaphragm is provided between each electric slider 107 and the purification tower 1. During the sliding process of the electric slider 107, the diaphragm is continuously stretched and contracted. The diaphragm can prevent the waste gas from infiltrating into the joint surface between the electric slider 107 and the slide rail 106, avoiding corrosion and prolonging the service life of the equipment.

[0030] In addition, the particles generated by the pulverization on the surface of the activated carbon fiber plate 5 may either fall off or adhere to the surface of the fiber plate. The adhered particles will block the pores of the activated carbon and reduce the filtration efficiency, thereby affecting the filtration effect of the waste gas. Therefore, by providing a filter screen 104 on each flow dividing plate 4, during the process of the flow dividing plate 4 moving rightward to push open the second rotating plate 10101, the flow dividing plate 4 synchronously drives the filter screen 104 to move rightward, so that the filter screen 104 moves rightward while sticking to the surface of the adjacent activated carbon fiber plate 5, thereby scraping off the powdered powder adhered to the surface of the activated carbon fiber plate 5. Then, the powdered powder is extracted and collected centrally by the extraction pipe 102, avoiding the powder blocking the activated carbon fiber plate 5 and affecting the waste gas filtration, improving the cleaning effect of the equipment on the activated carbon fiber plate 5. At the same time, the presence of the filter screen 104 can also intercept the fallen powdered powder during the waste gas filtration, avoiding the powder directly following the air flow and being discharged to the outside from the exhaust pipe 2, further ensuring that the external environment is not polluted.

[0031] Embodiment 2 On the basis of Embodiment 1, as Figure 1 and Figures 9-12As shown in the figure, it further includes a pull rod 201 and a baffle 202; a pull rod 201 is fixedly connected to the front side of each activated carbon fiber plate 5; each activated carbon fiber plate 5 is detachably connected to the purification tower 1; a baffle 202 is slidably connected to each flow dividing plate 4 through a spring; each baffle 202 slides left and right within the adjacent flow dividing plate 4; a number of third air grooves 20201 are formed in each baffle 202.

[0032] It further includes an electromagnet 203; a number of electromagnets 203 are fixedly connected to the upper side of each flow dividing plate 4; each filter screen 104 is rotatably connected to the adjacent flow dividing plate 4, and one end of the frame of each filter screen 104 away from the flow dividing plate 4 is made of a magnetic material; a number of limiting grooves 4003 are provided on each flow dividing plate 4; a stopper 10401 is provided on the rotating shaft of each filter screen 104, and each stopper 10401 is located within the adjacent limiting groove 4003.

[0033] A sealing strip is provided between each activated carbon fiber plate 5 and the purification tower 1 to enhance the sealing effect between the activated carbon fiber plate 5 and the purification tower 1 and prevent waste gas from flowing out.

[0034] During the process of filtering and purifying waste gas, since the waste gas is poisonous and harmful to human inhalation, when workers replace the activated carbon fiber plate 5, they need to stop the equipment from filtering waste gas and then disassemble and replace the activated carbon fiber plate 5. To facilitate workers to replace and maintain the activated carbon fiber plate 5 without affecting waste gas filtration, by controlling the two electric sliders 107 above and below a single activated carbon fiber plate 5 to slide to the right, that is, the two flow dividing plates 4 above and below the activated carbon fiber plate 5 move to the right as shown in Figure 11 the figure. The left sides of the two flow dividing plates 4 are both attached to the right side of the first rotating plate 3001. At this time, the first rotating plate 3001 is in a closed state, and the baffle 202 is received in the flow dividing plate 4 under the extrusion of the first rotating plate 3001, thereby compressing the spring between the baffle 202 and the flow dividing plate 4. At this time, the third air groove 20201 and the first air groove 4001 are in a staggered state as shown in Figure 11 the figure, thereby closing the first air groove 4001. At this time, the first rotating plate 3001 is also in a closed state, so that waste gas cannot enter the two flow dividing plates 4 that have moved to the right. At this time, workers only need to pull the pull rod 201 to extract the activated carbon fiber plate 5 between the two flow dividing plates 4, and they can replace and maintain the activated carbon fiber plate 5 without stopping waste gas filtration. Since the first air grooves 4001 on the two flow dividing plates 4 are blocked by the baffle 202, the waste gas in the first air chamber 1002 cannot flow between the two flow dividing plates 4, that is, there is no waste gas leakage or circulation when workers disassemble the activated carbon fiber plate 5, avoiding workers from inhaling waste gas and getting poisoned, and improving the protection ability of the equipment for workers.

[0035] It is also considered that when the pulverized powder is intercepted by the filter screen 104, although the powder can be driven into the flow dividing plate 4 by the air flow and finally sucked away through the suction pipe 102, part of the air flow still flows along the upper and lower sides of the flow dividing plate 4. This causes some of the pulverized powder to be easily pushed against the filter screen 104 by the air flow and difficult to flow into the flow dividing plate 4. Therefore, when it is necessary to collect the pulverized powder, the electromagnet 203 is controlled to be powered off, so that the electromagnet 203 loses its magnetism. After the filter screen 104 made of metal material loses the adsorption of the electromagnet 203, it falls to the right under the action of the air flow blowing. It should be noted that during the tilting process of the filter screen 104, the block 10401 on the rotating shaft of the filter screen 104 always rotates in the limiting groove 4003. When an angle of 30 degrees is formed between the filter screen 104 and the surface of the flow dividing plate 4, the block 10401 on the rotating shaft of the filter screen 104 cannot continue to rotate due to the limitation of the limiting groove 4003, that is, the filter screen 104 cannot continue to fall when an angle of 30 degrees is formed between it and the surface of the flow dividing plate 4, so that there is a distance between the filter screen 104 and the surface of the activated carbon fiber board 5. When the air flow passes through the filter screen 104, the air flow carries the pulverized powder and flows to the right along the gap between the filter screen 104 and the activated carbon fiber board 5, then enters the flow dividing plate 4 through the first air groove 4001, and finally is discharged to the second air cavity 1003 through the second air groove 4002 and sucked away by the suction pipe 102, improving the cleaning ability of the equipment for the pulverized powder. After the cleaning is completed, the electromagnet 203 is restarted and powered on, so that the electromagnet 203 has magnetism, and then the filter screen 104 approaches the electromagnet 203 under the action of magnetism. Similarly, under the limitation of the limiting groove 4003, the filter screen 104 cannot continue to approach the electromagnet 203 in a state perpendicular to the flow dividing plate 4, so as to use the filter screen 104 to intercept the pulverized powder again.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A purification tower for chemical production based on isopropyl isocyanate, comprising a purification tower (1); a circular hole (1001) is provided on the purification tower (1); a first air cavity (1002) is provided in the purification tower (1), and the circular hole (1001) is connected to the first air cavity (1002); an exhaust pipe (2) is installed on the purification tower (1); a plurality of activated carbon fiber boards (5) are evenly distributed from top to bottom in the purification tower (1); the characteristics are: A plurality of partitions (3) are fixedly connected to the left inner side of the purification tower (1); a plurality of first rotating plates (3001) are rotatably connected between each two adjacent partitions (3); a cleaning assembly for cleaning pulverized powder of an activated carbon fiber board (5) is slidably connected inside the purification tower (1); a plurality of diverter plates (4) are arranged on the cleaning assembly so that the exhaust gas can fully contact the activated carbon fiber board (5), and the diverter plates (4) are arranged in a hollow shape; a plurality of first gas grooves (4001) are opened on each diverter plate (4); and each diverter plate (4) is located between two activated carbon fiber boards (5).

2. A purification tower for chemical production based on isopropyl isocyanate according to claim 1, characterized in that: The cleaning component comprises a guide frame (101); a plurality of guide frames (101) are fixedly connected to the right inner side of the purification tower (1); a plurality of second rotating plates (10101) are rotatably connected between each two adjacent guide frames (101); all the guide frames (101) and the second rotating plates (10101) and the inner wall of the purification tower (1) together form a second air cavity (1003); the upper right side of the purification tower (1) is connected to an exhaust pipe (102) for cleaning pulverized powder of the activated carbon fiber board (5), and the exhaust pipe (102) is connected to an external exhaust device, and the exhaust device is connected to a collection bag; the purification tower (1) is connected to a plurality of air inlet pipes (103), and all the air inlet pipes (103) are connected to the outer side of the purification tower (1). 103) are connected to an external pump air device; each air inlet pipe (103) is located between two adjacent diverter plates (4); the right side of each diverter plate (4) is elastically connected to a slide plate (105) via a spring, so that the slide plate (105) can slide along the diverter plate (4); a second air groove (4002) is opened on the right side of each diverter plate (4); each slide plate (105) covers the corresponding second air groove (4002); a plurality of slide rails (106) are fixedly connected in the purification tower (1); each slide rail (106) is slidably connected to an electric slider (107); and each of the two electric sliders (107) facing each other are fixedly connected to the corresponding diverter plate (4).

3. A purification tower for chemical production based on isopropyl isocyanate according to claim 2, characterized in that: It also includes a filter screen (104); the upper side and the lower side of each diverter plate (4) are connected to a plurality of filter screens (104) for preventing pulverized powder of the activated carbon fiber board (5) from flowing out to the outside.

4. A purification tower for chemical production based on isopropyl isocyanate according to claim 3, characterized in that: The frame of each filter screen (104) is covered with rubber.

5. A purification tower for chemical production based on isopropyl isocyanate according to claim 3, characterized in that: The inner wall of each diverter plate (4) is coated with an anti-adhesion coating.

6. A purification tower for chemical production based on isopropyl isocyanate according to claim 2, characterized in that: A diaphragm is provided between each electric slider (107) and the purification tower (1).

7. A purification tower for chemical production based on isopropyl isocyanate according to claim 1, characterized in that: Each first air groove (4001) is inclined toward the right.

8. A purification tower for chemical production based on isopropyl isocyanate according to claim 6, characterized in that: It also includes a pull rod (201); each activated carbon fiber board (5) is fixedly connected to a pull rod (201) on the front side for workers to pull out the activated carbon fiber board (5) for maintenance; each activated carbon fiber board (5) is detachably connected to the purification tower (1); each diverter plate (4) is slidably connected to a baffle (202) for preventing exhaust gas from overflowing via a spring; each baffle (202) slides left and right in an adjacent diverter plate (4); and each baffle (202) is provided with a plurality of third gas grooves (20201).

9. A purification tower for chemical production based on isopropyl isocyanate according to claim 8, characterized in that: It also includes an electromagnet (203); a plurality of electromagnets (203) are fixedly connected to the upper side of each diverter plate (4) to improve the cleaning effect of the device on the pulverized powder of the activated carbon fiber plate (5); each filter screen (104) is rotatably connected to an adjacent diverter plate (4), and an end of the frame of each filter screen (104) away from the diverter plate (4) is made of magnetic material; a plurality of limiting grooves (4003) are provided on each diverter plate (4); a stopper (10401) is provided on the rotating shaft of each filter screen (104), and each stopper (10401) is located in an adjacent limiting groove (4003).

10. A purification tower for chemical production based on isopropyl isocyanate according to claim 9, characterized in that: A sealing strip is provided between each activated carbon fiber board (5) and the purification tower (1).

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