A flue gas purification system for plastic processing

Abstract

The application discloses a flue gas purification system for plastic processing and belongs to the technical field of plastic processing. The flue gas purification system comprises an air inlet unit, a pretreatment unit, a deep purification unit, an energy-saving recovery unit and an air outlet unit. The pretreatment unit comprises a cyclone separator and a cooling device. The deep purification unit comprises an electrostatic precipitator, an adsorption device and a catalytic oxidation device, which are sequentially arranged along the flue gas conveying direction. The adsorbent arranged in the adsorption device is composed of first modified activated carbon, second modified activated carbon and modified activated alumina. The first modified activated carbon is activated carbon with copper loaded on the surface. The second modified activated carbon is activated carbon with graphene oxide loaded thereon. The modified activated alumina is obtained by modifying activated alumina with sulfuric acid and aluminum chloride in sequence. The flue gas purification system provided by the application has high purification efficiency and meets the environmental protection requirements, can effectively purify flue gas and meet the industrial emission requirements.

Description

Technical Field

[0001] This invention relates to the field of plastic processing technology, and in particular to a flue gas purification system for plastic processing. Background Technology

[0002] Plastic granules refer to granular plastics, generally classified into over 200 types, with further subdivisions reaching thousands. Common plastic granules include general-purpose plastics, engineering plastics, and specialty plastics. General-purpose plastics include: polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyester, and polyurethane. Engineering plastics include: nylon, polytetrafluoroethylene, polyoxymethylene, and polycarbonate. Specialty plastics include: thermosetting plastics and functional polymer plastics, such as those used in artificial kidneys.

[0003] During the processing of plastic pellets, a large amount of fumes containing harmful substances, such as dust and volatile organic compounds (VOCs), are generated. If these harmful substances are not removed, they will cause serious environmental pollution and harm human health. Summary of the Invention

[0004] The purpose of this invention is to provide a flue gas purification system for plastic processing, which can effectively treat volatile organic compounds in the flue gas, effectively preventing the flue gas from polluting the environment and harming human health.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A flue gas purification system for plastic processing includes an air intake unit, a pretreatment unit, a deep purification unit, an energy-saving recovery unit, and an exhaust unit.

[0007] The pretreatment unit includes a cyclone separator and a cooling device;

[0008] The deep purification unit includes an electrostatic precipitator, an adsorption device, and a catalytic oxidation device, which are arranged sequentially along the flue gas conveying direction.

[0009] The adsorbent in the adsorption device consists of a first modified activated carbon, a second modified activated carbon, and modified activated alumina; the first modified activated carbon is activated carbon with copper loaded on its surface; the second modified activated carbon is activated carbon loaded with graphene oxide; and the modified activated alumina is obtained by modifying activated alumina sequentially with sulfuric acid and aluminum chloride.

[0010] Preferably, the adsorption device includes an adsorption box, a placement net disposed within the adsorption box, a first discharge port disposed at the bottom end of the placement net, a telescopic pipe disposed at the bottom end of the first discharge port, a sealing device disposed at the first discharge port, and a telescopic device for driving the placement net to move vertically within the adsorption box; the bottom end of the telescopic pipe is connected to a second discharge port disposed at the bottom end of the adsorption box; a top cover is disposed at the top of the adsorption box, an air outlet pipe is disposed on the top cover, and an air inlet pipe is disposed on the side wall of the adsorption box below the placement net.

[0011] Preferably, the side wall of the placement net is provided with a plurality of first sliders, and the inner wall of the adsorption box is provided with a plurality of first vertical grooves that slide in cooperation with the first sliders.

[0012] Preferably, the telescopic pipe is composed of multiple interlocking pipes, with adjacent pipes slidably connected.

[0013] Preferably, the sealing device includes a telescopic rod disposed above the placement net and a plurality of support rods connected to fix the telescopic rod to the placement net; when the telescopic rod is extended, the telescopic end can block the first discharge port.

[0014] Preferably, a support frame is provided at the bottom of the adsorption box, a second hydraulic rod is provided on the support frame, a motor base is provided at the top of the second hydraulic rod, and a motor is provided on the motor base;

[0015] The telescopic tube is equipped with a spiral conveying rod, and a first bevel gear is sleeved on the spiral conveying rod. The first bevel gear and the second bevel gear mesh with each other. A rotating rod is provided at the center of the second bevel gear, and the rotating rod is fixedly connected to the output end of the motor.

[0016] A limiting sleeve is rotatably fitted around the outside of the spiral conveying rod and below the rotating rod. The limiting sleeve is fixedly connected to the motor base via a connecting rod.

[0017] Preferably, a discharge pipe is provided below the second discharge port, and the side wall of the discharge pipe is provided with a through-hole to facilitate the passage of the connecting rod and the rotating rod.

[0018] Preferably, a movable plate is provided inside the through opening, the movable plate can slide vertically inside the through opening, and a telescopic plate is provided between the bottom end of the movable plate and the bottom wall of the through opening; the connecting rod passes through the movable plate and is fixedly connected to the movable plate, and the rotating rod passes through the movable plate and is rotatably connected to the movable plate.

[0019] Preferably, the mass ratio of the first modified activated carbon, the second modified activated carbon, and the modified activated alumina is 10-15:10:1-2.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. This invention addresses the characteristics of flue gas from the plastic granule processing industry by providing a highly efficient flue gas purification system that meets environmental protection requirements. The system effectively purifies the flue gas by sequentially introducing an inlet unit, a pretreatment unit, a deep purification unit, an energy-saving recovery unit, and an exhaust unit. Specifically, the pretreatment unit incorporates a cyclone separator and a cooling device to effectively remove larger solid particles from the flue gas while simultaneously cooling it to prevent particles and high temperatures from negatively impacting the adsorption effect of the adsorbent. The deep purification unit uses an electrostatic precipitator to further remove smaller dust particles. An adsorption device maximizes the removal of volatile organic compounds (VOCs), and a catalytic oxidation device further treats any remaining organic matter.

[0022] This invention can effectively remove dust and volatile organic compounds from flue gas, so that the purified flue gas meets industrial emission standards.

[0023] 2. By limiting the composition of the adsorbent in the adsorption device, the removal rate of volatile organic compounds can be significantly improved. At the same time, it can effectively improve the technical defect of activated carbon used in the prior art, which is prone to caking during long-term adsorption, and effectively improve the service life of the adsorbent.

[0024] Specifically, when activated carbon is used as a single adsorbent, its adsorption efficiency for volatile organic compounds is not high, generally below 85%.

[0025] Meanwhile, after adsorbing flue gas for a period of time, caking will occur, which will seriously reduce the adsorption efficiency. Furthermore, the caking activated carbon will be difficult to further exert its adsorption effect and will be difficult to regenerate, which will seriously affect its service life.

[0026] This invention improves the composition of the adsorbent by adjusting it to consist of a first modified activated carbon, a second modified activated carbon, and modified activated alumina. The first modified activated carbon is loaded with copper particles, which increases the surface attraction of the activated carbon, thereby improving the adsorption effect on volatile organic compounds. While loading with copper particles can alleviate the caking problem of the activated carbon, the improvement is not complete. Therefore, a second activated carbon modifier loaded with graphene oxide is added. Graphene oxide is rich in hydrophilic groups, which can improve the capture of organic matter and enhance the adsorption effect. It also significantly improves the adsorbent caking problem. Furthermore, graphene oxide can form a lubricating and buffering layer on the surface of the second modified activated carbon, effectively preventing particle breakage due to squeezing and collision. Further, since the flue gas contains a certain amount of humidity, which can affect the adsorption effect, modified activated alumina is added. This alumina can dry the flue gas while also playing a certain adsorption role, effectively avoiding the adverse effects of moisture and further improving the adsorbent caking problem.

[0027] By limiting the types of adsorbents, not only can the adsorption effect on organic matter be effectively improved, but also the problems of adsorbent caking and breakage caused by extrusion and collision can be effectively improved. Attached Figure Description

[0028] Figure 1 This is a process flow diagram from Example 1;

[0029] Figure 2 This is a cross-sectional view of the filter box in Example 2 from the front view.

[0030] Figure 3 for Figure 2 A schematic diagram of the structure of the netting placed in the center, viewed from above;

[0031] Figure 4 for Figure 2 A schematic diagram of the structure of the centrally placed shelf from the right view.

[0032] Figure 5 This is a schematic diagram of the cross-sectional structure of the telescopic tube viewed from above.

[0033] Figure 6 This is a schematic cross-sectional view of Example 3 from the front view.

[0034] Figure 7 for Figure 6 A schematic diagram of the structure of the discharge pipe viewed from the right.

[0035] Figure 8 for Figure 1 A cross-sectional view of the telescopic tube from the front view.

[0036] In the diagram: 1-Adsorption box, 2-Placement net, 3-First discharge port, 4-Telescopic pipe, 5-Second discharge port, 6-Air inlet pipe, 7-First slider, 8-First vertical slide, 10-Support rod, 9-Telescopic rod, 13-Horizontal plate, 14-Vertical plate, 15-Second hydraulic rod, 16-Motor base, 17-Screw conveyor rod, 18-First bevel gear, 19-Rotating rod, 20-Limiting sleeve, 21-Connecting rod, 22-Discharge pipe, 23-Through opening, 24-Moving plate, 25-Telescopic plate. Detailed Implementation

[0037] Example 1

[0038] A flue gas purification system for plastic processing, such as Figure 1 As shown, the system includes an air intake unit, a pretreatment unit, a deep purification unit, an energy-saving recovery unit, and an exhaust unit. The air intake unit includes an air intake pipe and a flow regulating valve. The air intake pipe is connected to the exhaust port of the plastic granule processing equipment to ensure that the flue gas smoothly enters the purification system. The flow regulating valve can adjust the flue gas flow rate according to actual conditions.

[0039] The pretreatment unit includes a cyclone separator (existing technology) and a cooling device (existing water-cooling or air-cooling devices can be used to cool the flue gas, creating favorable conditions for subsequent purification steps).

[0040] The deep purification unit includes an electrostatic precipitator, an adsorption device, and a catalytic oxidation device, which are arranged sequentially along the flue gas conveying direction.

[0041] The energy-saving recovery unit includes a waste heat recovery unit and a heat exchanger.

[0042] The exhaust system consists of an exhaust pipe and a detection device.

[0043] The adsorbent in the adsorption device consists of a first modified activated carbon, a second modified activated carbon, and a modified activated alumina; the first modified activated carbon is activated carbon with copper loaded on its surface; the second modified activated carbon is activated carbon loaded with graphene oxide; the modified activated alumina is obtained by sequentially modifying activated alumina with sulfuric acid and aluminum chloride; the mass ratio of the first modified activated carbon, the second modified activated carbon, and the modified activated alumina is 10:10:1.

[0044] The preparation method of the first modified activated carbon is as follows: 40 mL of CuCl2 solution with a concentration of 0.5 mol·L-1 is added to 5 g of 50-100 mesh activated carbon, the mixture is stirred thoroughly, washed with water until neutral, dried at 100-105℃ for 24 h, and then calcined at 500℃ for 2 h under N2 atmosphere.

[0045] The preparation method of the second modified activated carbon refers to the preparation method in Example 1 of patent CN202111195614.6.

[0046] The modified activated alumina is prepared as follows: 50 mmol / L H2SO4 solution is added to 50-100 mesh activated alumina at a solid-liquid mass ratio of 1:5, and the mixture is soaked for 0.5 h. Afterward, it is washed with deionized water until neutral and then dried in an oven at 110 ℃. Subsequently, 0.5% AlCl3 solution is added at a solid-liquid mass ratio of 1:15, and the mixture is soaked for 1 h. Afterward, it is washed with deionized water until neutral and then dried.

[0047] The working principle is as follows:

[0048] The flue gas from the plastic granule production is introduced into the pretreatment unit through the air intake pipe of the air intake unit. The larger dust particles (≥10μm solid particles) in the flue gas are then separated by the cyclone separator in the pretreatment unit. The flue gas is then cooled by a cooling device (air cooling or water cooling device) to reduce the temperature of the flue gas to below 50 degrees Celsius.

[0049] Fine particulate matter (0.01-50μm) is removed from the flue gas using an electrostatic precipitator in the deep purification unit. After dust removal, the concentration of volatile organic compounds in the flue gas is 167 mg / m³. 3 The relative humidity was <38%. Volatile organic compounds (VOCs) in the flue gas were then adsorbed by the adsorbent in the adsorption device. The VOC concentration after adsorption was 11.7 mg / m³. 3 The removal rate is 93%; finally, the remaining harmful substances in the flue gas are oxidized and decomposed into harmless substances to the greatest extent by a catalytic oxidation device (any catalytic oxidizer in the existing technology can be selected).

[0050] Waste heat in flue gas is collected by the waste heat recovery unit in the energy-saving recovery unit, and the heat is transferred to the cooling device of the pretreatment unit or other links that require heat energy through the heat exchanger, so as to realize the recovery and utilization of energy and reduce energy consumption.

[0051] The purified flue gas is discharged into the atmosphere through the exhaust pipe of the exhaust unit, and the detection device monitors the quality of the emitted flue gas in real time to ensure that the emission meets the standards.

[0052] Example 2

[0053] In the prior art, adsorption devices typically include an adsorption box 1 and a placement net 2 fixedly installed inside the adsorption box 1. Since activated carbon is usually added to the adsorption box 1 from the top, given that the adsorption box 1 has a certain height, the activated carbon is prone to breakage during addition due to the high drop height. This can lead to collisions between the activated carbon and the placement net 2, or between the activated carbon added to the placement net 2 and the adsorption of flue gas.

[0054] Based on this, and building upon Example 1, the present invention defines the structure of the adsorption device, such as... Figure 2 As shown, the device includes an adsorption box 1, a placement net 2 disposed within the adsorption box 1, a first discharge port 3 disposed at the bottom of the placement net 2, a telescopic pipe 4 disposed at the bottom of the first discharge port 3, a sealing device disposed at the first discharge port 3, and a telescopic device for driving the placement net 2 to move vertically within the adsorption box 1. In this embodiment, a first hydraulic rod is used. The bottom end of the telescopic pipe 4 is connected to a second discharge port 5 disposed at the bottom of the adsorption box 1. A top cover is provided at the top of the adsorption box 1, and an air outlet pipe is provided on the top cover. An air inlet pipe 6 is provided on the side wall of the adsorption box 1 below the placement net 2. Further, as... Figure 1 and Figure 2 As shown, the side wall of the placement net 2 is provided with a plurality of first sliders 7, and the inner wall of the adsorption box 1 is provided with a plurality of first vertical grooves 8 that slide in cooperation with the first sliders 7.

[0055] Furthermore, such as Figure 5 and Figure 8 As shown, the telescopic pipe 4 consists of multiple interlocking pipes (the specific number of pipes depends on the actual situation), with very slight gaps between adjacent pipes. Figure 8 As shown, between two adjacent pipes, a second slider is provided on the outer wall of the inner pipe, and a second vertical groove is provided on the inner wall of the outer pipe to slide with the second slider. Since the top and bottom of the second vertical groove are not connected to the outside, the second slider can be effectively prevented from sliding out of the second vertical groove.

[0056] Furthermore, such as Figure 2 As shown, the sealing device includes a telescopic rod 9 disposed above the placement net 2, and multiple support rods 10 connected together to fix the telescopic rod 9 to the placement net 2; when the telescopic rod 9 extends, the telescopic end of the telescopic rod 9 can block the first discharge port 3. Figure 2 As shown, the telescopic rod 9 consists of an outer rod and an inner rod. The top wall of the outer rod is conical to prevent material accumulation during adsorbent collection. The outer wall of the inner rod is provided with a third slider (both the third slider and the third vertical groove are existing technologies and are not shown in the figure). The inner wall of the outer rod is provided with a third vertical groove that slides with the third slider (the top and bottom ends are not connected to the outside). Therefore, the inner rod can slide up and down inside the outer rod. Furthermore, when the telescopic rod 9 is stationary, under the weight of the inner rod, the third slider can slide down autonomously within the third vertical groove, causing the bottom end of the inner rod to block the first discharge port 3 (e.g., ...). Figure 2 (As shown).

[0057] Furthermore, such as Figure 1and Figure 4 As shown, a support frame is provided at the bottom of the adsorption box 1, and a second hydraulic rod 15 is provided on the support frame. A motor base 16 is provided at the top of the second hydraulic rod 15, and a motor is provided on the motor base 16. A spiral conveying rod 17 is provided inside the telescopic tube 4, and a first bevel gear 18 is sleeved on the spiral conveying rod 17. The first bevel gear 18 and the second bevel gear mesh. A rotating rod 19 is provided at the center of the second bevel gear, and the rotating rod 19 is fixedly connected to the output end of the motor. In order to limit the spiral conveying rod 17, such as... Figure 2 As shown, a limiting sleeve 20 is rotatably fitted around the outside of the spiral conveying rod 17 and below the rotating rod 19 (a bearing, not shown in the figure, is provided between the spiral conveying rod 17 and the limiting sleeve 20). The limiting sleeve 20 is fixedly connected to the motor base 16 via a connecting rod 21. Further, as... Figure 4 As shown, the support frame includes a horizontal plate 13 and two vertical plates 14 disposed at the top of the horizontal plate 13. The vertical plates 14 are connected to the bottom of the adsorption box 1. The second hydraulic rod 15 is installed at the top of the horizontal plate 13. The motor base 16 is slidably connected to the two vertical plates 14. That is, in actual implementation, the motor base 16 can slide vertically within the two vertical plates 14 by setting slide rails or other means.

[0058] Working Principle: When adding adsorbent, the top cover is opened, and then the first hydraulic rod is activated, causing the placement net 2 to move upward. During this upward movement, the first slider 7 slides upward within the first vertical groove 8. Simultaneously, the inner rod in the telescopic rod 9 automatically slides down to the first discharge port 3 under the influence of gravity, sealing the first discharge port 3. Furthermore, multiple pipes in the telescopic tube 4 slide relative to each other, gradually extending the telescopic tube 4 to match the height of the placement net 2. When the placement net 2 slides upward to near the top of the adsorption box 1, adsorbent is added to the adsorption box 1. Because the placement net 2 is relatively close to the top of the adsorption box 1 at this time, the adsorbent does not experience significant gravitational potential energy during addition, thus preventing collisions and damage to the adsorbent. As the adsorbent is continuously added, the first hydraulic rod retracts, causing the placement net 2 to continuously move downward, ensuring that the difference between the drop position and the addition position of the adsorbent is minimal. After the net 2 has completely slid down to the bottom of the first vertical chute 8, the top cover is put on, and the top cover can be fixed by bolts, etc.

[0059] When the adsorbent needs to be replaced, the second hydraulic rod 15 is activated, causing the components mounted on the motor base 16, including the motor base 16, connecting rod 21, limiting sleeve 20, and screw conveyor rod 17, to move upwards synchronously. During this upward movement, the screw conveyor rod 17 pushes the inner rod upwards, causing the inner rod to slide upwards within the outer rod until it reaches its maximum sliding limit. At this point, there is a certain distance between the telescopic rod 9 and the first discharge port 3, allowing the adsorbent to slide down to the first discharge port 3 autonomously. Subsequently, the motor is activated, causing the rotating rod 19 to rotate, which in turn drives the first bevel gear 18, the second bevel gear, and the screw conveyor rod 17 to rotate. As the screw conveyor rod 17 rotates, its top end is rotatably connected to the bottom end of the inner rod, promoting the discharge of the adsorbent and preventing blockage within the telescopic tube 4. After the adsorbent is discharged through the first discharge port 3, the telescopic tube 4, and the second discharge port 5, it can be collected.

[0060] After the adsorbent has been discharged, the second hydraulic rod 15 is closed, causing the motor base 16 to drive the components on it back to their original positions.

[0061] It is worth noting that this device is not suitable if the adsorbent is activated carbon. Generally speaking, the premise for replacing the adsorbent is that its adsorption performance is reduced and it is difficult to complete the adsorption operation. At this time, the activated carbon may caking to a certain extent. When caking occurs, the material feeding is not smooth. The caking activated carbon placed on the mesh 2 may not be able to slide smoothly to the first discharge port 3. The screw conveyor 17 only has a conveying function at the first discharge port 3. It is difficult to convey the activated carbon that has not fallen to the first discharge port 3.

[0062] Example 3

[0063] In Example 2, because the discharge pipe 22 was not installed at the second discharge port 5, it was extremely inconvenient to collect the adsorbent. Because of the installation of support frames and other devices, the collection container could not be placed directly at the second discharge port 5, which made it easy for the adsorbent to leak out.

[0064] Based on this, and building upon Example 2, as follows: Figure 6 and Figure 7 As shown, a discharge pipe 22 is provided below the second discharge port 5, and the side wall of the discharge pipe 22 is provided with a through opening 23 to facilitate the passage of the connecting rod 21 and the rotating rod 19. Further, as... Figure 6 and Figure 7 As shown, a movable plate 24 is provided inside the through opening 23. The movable plate 24 can slide vertically within the through opening 23 and will not fall off. A telescopic plate 25 is provided between the bottom end of the movable plate 24 and the bottom wall of the through opening 23. Figure 7As shown, the telescopic plate 25 includes an upper plate and a lower plate, which are slidably connected. The upper plate is connected to a movable plate, and the lower plate is connected to the bottom wall of the through-hole 23. The connecting rod 21 passes through the movable plate 24 and is fixedly connected to the movable plate 24. The rotating rod 19 passes through the movable plate 24 and is rotatably connected to the movable plate 24.

[0065] Working principle: When collecting the adsorbent, first place the collection container at the bottom of the discharge pipe 22. Then, activate the second hydraulic rod 15, causing the motor base 16 to drive the moving plate 24 to slide upwards within the through-hole 23 until the moving plate 24 slides to the top wall of the through-hole 23. At this point, the screw conveyor rod 17 pushes the inner rod to its highest position. During the upward movement of the moving plate 24, the upper plate and inner plate of the telescopic plate 25 slide relative to each other to match the height of the moving plate 24, preventing the adsorbent from spilling out along the through-hole 23. Afterward, start the motor, and collection can proceed smoothly.

[0066] Comparative Example 1

[0067] Compared to Example 1, only the adsorbent was changed to activated carbon, while all other steps and conditions remained the same.

[0068] The adsorption device achieves a removal rate of 81% for volatile organic compounds.

[0069] The caking of the adsorbents in Example 1 and Comparative Example 1 was recorded. Both were operated simultaneously under identical external conditions. While significant caking occurred in the activated carbon of Comparative Example 1, no caking occurred in the adsorbent of Example 1.

Claims

1. A flue gas purification system for plastic processing, characterized in that, It includes an intake unit, a pretreatment unit, a deep purification unit, an energy-saving recovery unit, and an exhaust unit; The pretreatment unit includes a cyclone separator and a cooling device; The deep purification unit includes an electrostatic precipitator, an adsorption device, and a catalytic oxidation device, which are arranged sequentially along the flue gas conveying direction. The adsorbent in the adsorption device consists of a first modified activated carbon, a second modified activated carbon, and a modified activated alumina; the first modified activated carbon is activated carbon with copper loaded on its surface; the second modified activated carbon is activated carbon with graphene oxide loaded on its surface; the modified activated alumina is obtained by sequentially modifying activated alumina with sulfuric acid and aluminum chloride. The adsorption device includes an adsorption box (1), a placement net (2) disposed in the adsorption box (1), a first discharge port (3) disposed at the bottom end of the placement net (2), a telescopic pipe (4) disposed at the bottom end of the first discharge port (3), a sealing device disposed at the first discharge port (3), and a telescopic device for driving the placement net (2) to make vertical displacement in the adsorption box (1); the bottom end of the telescopic pipe (4) is connected to a second discharge port (5) disposed at the bottom end of the adsorption box (1); a top cover is provided at the top of the adsorption box (1), an air outlet pipe is provided on the top cover, and an air inlet pipe (6) is provided on the side wall of the adsorption box (1) and below the placement net (2). The sealing device includes a telescopic rod (9) disposed above the placement net (2) and a plurality of support rods (10) for fixing the telescopic rod to the placement net (2); when the telescopic rod (9) is extended, the telescopic end can block the first discharge port (3).

2. The flue gas purification system for plastic processing according to claim 1, characterized in that, The side wall of the placement net (2) is provided with a plurality of first sliders (7), and the inner wall of the adsorption box (1) is provided with a plurality of first vertical grooves (8) that slide in cooperation with the first sliders (7).

3. The flue gas purification system for plastic processing according to claim 1, characterized in that, The telescopic pipe (4) is composed of multiple interlocking pipes, with adjacent pipes slidingly connected.

4. The flue gas purification system for plastic processing according to claim 1, characterized in that, The bottom of the adsorption box (1) is provided with a support frame, and a second hydraulic rod (15) is provided on the support frame. A motor base (16) is provided at the top of the second hydraulic rod (15), and a motor is provided on the motor base (16). The telescopic tube (4) is provided with a spiral conveying rod (17), and a first bevel gear (18) is sleeved on the spiral conveying rod (17). The first bevel gear (18) meshes with the second bevel gear. A rotating rod (19) is provided at the center of the second bevel gear. The rotating rod (19) is fixedly connected to the output end of the motor. A limiting sleeve (20) is rotatably sleeved outside the spiral conveying rod (17) and below the rotating rod (19). The limiting sleeve (20) is fixedly connected to the motor base (16) via a connecting rod (21).

5. The flue gas purification system for plastic processing according to claim 4, characterized in that, Below the second discharge port (5), there is a discharge pipe (22), and the side wall of the discharge pipe (22) is provided with a through opening (23) for the connecting rod (21) and the rotating rod (19) to pass through.

6. The flue gas purification system for plastic processing according to claim 5, characterized in that, A movable plate (24) is provided inside the through opening (23). The movable plate (24) can slide vertically inside the through opening (23). A telescopic plate (25) is provided between the bottom end of the movable plate (24) and the bottom wall of the through opening (23). The connecting rod (21) passes through the movable plate (24) and is fixedly connected to the movable plate (24). The rotating rod (19) passes through the movable plate (24) and is rotatably connected to the movable plate (24).

7. The flue gas purification system for plastic processing according to claim 1, characterized in that, The mass ratio of the first modified activated carbon, the second modified activated carbon, and the modified activated alumina is 10-15:10:1-2.

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