PVC color film production waste gas treatment device

Abstract

The present application relates to the separation technical field, specifically disclose a kind of PVC color film production waste gas treatment device, comprising: shell;Gravity settling unit;Inertial interception unit;And centrifugal separation unit.The present application is sequentially arranged gravity settling bin, inertial separation bin and centrifugal treatment bin from bottom to top in shell, realize large-particle droplet and PVC dust, oily dust, small particle's step-by-step removal;Gravity settling rate first separates coarse heavy impurities, reduce subsequent load;Inertial interception utilizes collision high-efficiency capture oily aerosol, stable and reliable;Centrifugal separation is high-speed separation to submicron level particle, ensure low dust emission;Three levels of synergy avoids single technology limitation, effectively improves overall purification efficiency.

Description

Technical Field

[0001] This invention relates to the field of separation technology, and more specifically, to a device for treating waste gas from PVC color film production. Background Technology

[0002] The exhaust gas generated during PVC film production contains large-diameter PVC dust, oily micro-dust (such as plasticizer droplets and resin pyrolysis volatiles), and submicron-sized fine particles. Traditional exhaust gas treatment equipment often uses single cyclone dust collectors, bag filters, or wet scrubbing, which cannot achieve graded removal: bag filters are easily clogged by oily particles, cyclone dust collectors have low efficiency in capturing fine particles, and wet scrubbing generates a large amount of oily wastewater, causing serious secondary pollution. Fixed baffles or deflectors are usually used, and oily particles easily accumulate on the plate surface after collision, forming an oil sludge layer. As the operating time increases, the interception efficiency drops sharply, and cleaning and maintenance become frequent. Summary of the Invention

[0003] To overcome the above-mentioned technical problems, the present invention proposes a waste gas treatment device for PVC color film production.

[0004] The objective of this invention can be achieved through the following technical solutions: A PVC color film production waste gas treatment device, comprising: The shell has an air inlet and an exhaust outlet on one side of its bottom and one side of its top, respectively, and a viewing window is also provided on one side of its bottom. The shell contains, from bottom to top, a gravity settling chamber, an inertial separation chamber and a centrifugal processing chamber. The gravity settling unit, which is installed in the gravity settling chamber, is used to intercept and separate large-diameter liquid droplets and PVC dust in the exhaust gas by gravity settling. An inertial interception unit, located within the inertial separation chamber, is used to intercept oily dust particles in the exhaust gas through inertial collision. The centrifugal separation unit, located inside the centrifugal processing chamber, is used to capture fine particles in the exhaust gas.

[0005] As a further aspect of the present invention: the gravity settling unit includes an intercepting mesh disposed within the gravity settling chamber and an upward-floating grid located at the junction of the gravity settling chamber and the inertial separation chamber, wherein the intercepting mesh and the upward-floating grid are staggered in the vertical direction.

[0006] As a further aspect of the present invention: the inertial interception unit includes a rotating shaft fixed above the inertial separation chamber, and a fan-shaped swing plate is rotatably mounted on the rotating shaft.

[0007] As a further aspect of the present invention: a central transition chamber is provided at the center of the inertial separation chamber, and a plurality of radial flow grooves communicating with the central transition chamber are provided circumferentially on the inner side of the inertial separation chamber. A plurality of axial guide rods are vertically provided at the top of the central transition chamber, and an annular pressure plate that abuts against the fan-shaped swing plate is slidably passed through the axial guide rods. A spring is sleeved on the upper end of the axial guide rods.

[0008] As a further embodiment of the present invention: a drive motor is installed on the top of the housing, and the output end of the drive motor is connected to a rotating drum that vertically penetrates the centrifugal treatment chamber, the central transition chamber and the gravity settling chamber in sequence. An inner flow channel is opened inside the rotating drum, and several air inlet slots communicating with the central transition chamber are circumferentially opened on the lower side wall of the inner flow channel. The upper end of the inner flow channel is connected to the centrifugal separation unit.

[0009] As a further embodiment of the present invention: a spiral groove is formed on the outer circumferential surface of the rotating drum, and a sliding cavity is formed on the inner side of the annular pressure plate, wherein a sliding pin adapted to the spiral groove is radially slidably embedded in the sliding cavity.

[0010] As a further aspect of the present invention: a magnetic block for magnetically attracting the sliding pin is provided at the lower end of the spiral groove, and an air blowing hole communicating with the interior of the inner flow channel is provided at the upper end of the spiral groove.

[0011] As a further embodiment of the present invention: the centrifugal separation unit includes a conical separation cover coaxially fixedly disposed around the outer periphery of the rotating drum, the side wall of the conical separation cover is provided with a plurality of separation holes, and the upper end of the inner flow channel is provided with a plurality of exhaust grooves communicating with the interior of the conical separation cover.

[0012] As a further aspect of the present invention: a spray unit is also provided inside the gravity settling chamber. The spray unit includes an adsorption chamber located at the bottom of the gravity settling chamber. An inlet is provided on one side of the adsorption chamber. A partition is fixed inside the adsorption chamber. A squeezing chamber is formed above the partition. A communication port communicating with the adsorption chamber is provided on the side of the squeezing chamber away from the inlet.

[0013] As a further aspect of the present invention: a plurality of turbine blades are provided at one end of the rotating drum that extends into the adsorption chamber, and a rotating disk is fixedly provided on the rotating drum and rotatably and sealingly connected to the upper opening of the extrusion chamber, and a plurality of spray holes are provided circumferentially on the rotating disk.

[0014] The beneficial effects of this invention are: The present invention has a gravity settling chamber, an inertial separation chamber and a centrifugal treatment chamber arranged sequentially from bottom to top in the shell, which correspond to the stepwise removal of large-diameter droplets and PVC dust, oily dust and fine particles, respectively. This avoids the limitation of a single separation structure in the treatment of complex components, and enables each unit to play an optimal role in capturing pollutants in a specific particle size range, thereby improving the overall purification efficiency. The gravity settling unit utilizes the natural upward flow of air to first separate large-diameter liquid droplets and coarse PVC dust particles from the exhaust gas, reducing the amount of coarse impurities entering the inertial interception unit and the centrifugal separation unit. The inertial interception unit uses the high-speed collision between the exhaust gas and the interception structure during its ascent to capture oily particles due to inertia, achieving stable and reliable separation of oily aerosols. The centrifugal separation unit performs high-speed centrifugal separation on the submicron-sized fine particles remaining after the first two stages of treatment, effectively reducing the dust concentration in the exhaust gas finally discharged from the exhaust port. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a cross-sectional structural schematic diagram from another perspective of the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 for Figure 3 Enlarged view at point B in the middle; Figure 7 This is a schematic diagram of the centrifugal separation unit in this invention; Figure 8 This is a schematic diagram of the spray unit in this invention; Figure 9 This is a schematic diagram of the flow path of the exhaust gas in this invention.

[0017] In the picture: 100. Shell; 110. Air inlet; 120. Exhaust outlet; 130. Viewing window; 140. Gravity settling chamber; 150. Inertial separation chamber; 151. Radial flow channel; 160. Centrifugal treatment chamber; 170. Central transition chamber; 180. Drive motor; 190. Rotary drum; 191. Inner flow channel; 192. Air inlet slot; 193. Exhaust slot; 200. Gravity settling unit; 210. Interception mesh; 220. Floating grid; 300. Inertial interception unit; 310. Rotating shaft; 320. Fan-shaped swing plate; 330. Axial guide rod; 340. Annular pressure plate; 341. Sliding cavity; 342. Sliding pin; 350. Spring; 360. Spiral groove; 361. Magnetic block; 362. Air blowing hole; 400. Centrifugal separation unit; 410. Conical separation hood; 420. Separation orifice; 500, Spray unit; 510, Adsorption chamber; 520, Baffle plate; 530, Water inlet; 540, Connecting port; 550, Extrusion chamber; 560, Turbine blade; 570, Rotary disc; 580, Spray hole. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This invention discloses a PVC color film production waste gas treatment device, including a shell 100, a gravity settling unit 200, an inertial interception unit 300, and a centrifugal separation unit 400. The shell 100 has an air inlet 110 on one side of its bottom and an exhaust outlet 120 on one side of its top. A viewing window 130 is also provided on one side of the bottom of the shell 100. Inside the shell 100, from bottom to top, are arranged a gravity settling chamber 140, an inertial separation chamber 150, and a centrifugal treatment chamber 160. The gravity settling unit 200 is located in the gravity settling chamber 140 and is used to intercept and separate large-diameter liquid droplets and PVC dust in the waste gas through gravity settling. The inertial interception unit 300 is located in the inertial separation chamber 150 and is used to intercept oily micro-dust in the waste gas through inertial collision. The centrifugal separation unit 400 is located in the centrifugal treatment chamber 160 and is used to capture fine particles in the waste gas.

[0020] Specifically, please refer to Figure 9 The exhaust gas is introduced into the air inlet 110 at the bottom of the housing 100, and then enters the gravity settling chamber 140 and flows upward into the inertial separation chamber 150. When the exhaust gas passes through the gravity settling chamber 140, the gravity settling unit 200 uses gravity to separate large particulate impurities and condensate droplets in the exhaust gas. Then the exhaust gas rises to the inertial separation chamber 150, where it collides and decelerates with the inertial interception unit 300. Oily particles are captured by the inertial interception unit 300 and separated from the exhaust gas due to inertia. Then the exhaust gas continues to flow upward into the centrifugal treatment chamber 160, where the dust-containing particles in the exhaust gas are further separated by centrifugal treatment. Finally, the treated exhaust gas is discharged from the exhaust port 120.

[0021] It should be noted that the present invention has a gravity settling chamber 140, an inertial separation chamber 150 and a centrifugal treatment chamber 160 arranged sequentially from bottom to top inside the shell 100, which correspond to the stepwise removal of large-diameter droplets and PVC dust, oily dust and fine particles, respectively. This avoids the limitation of a single separation structure in the treatment of complex components, and enables each unit to play its optimal capture performance for pollutants in a specific particle size range, thereby improving the overall purification efficiency. The gravity settling unit 200 utilizes the natural upward flow of air to first separate large-diameter liquid droplets and coarse PVC dust particles from the exhaust gas, reducing the amount of coarse and heavy impurities entering the inertial interception unit 300 and the centrifugal separation unit 400. The inertial interception unit 300 uses the high-speed collision between the exhaust gas and the interception structure during its ascent to capture oily particles due to inertia, thus achieving stable and reliable separation of oily aerosols. The centrifugal separation unit 400 performs high-speed centrifugal separation on the submicron-sized fine particles that remain after the first two stages of treatment, effectively reducing the dust concentration in the exhaust gas finally discharged from the exhaust port 120.

[0022] In one embodiment, please refer to Figure 4 and Figure 5 The gravity settling unit 200 includes an intercepting mesh 210 disposed in the gravity settling chamber 140 and an upward-floating grid 220 located at the junction of the gravity settling chamber 140 and the inertial separation chamber 150. The intercepting mesh 210 and the upward-floating grid 220 are staggered in the vertical direction. Specifically, as the exhaust gas flows from bottom to top through the gravity settling chamber 140, the staggered distribution of the intercepting mesh 210 and the floating grid 220 causes the flow path of the exhaust gas within the gravity settling chamber 140 to be tortuous. As a result, denser particulate impurities and condensate droplets in the exhaust gas can be intercepted by the intercepting mesh 210 and undergo gravity settling, thus separating from the exhaust gas.

[0023] It is worth noting that by arranging the intercepting mesh 210 and the floating grid 220 in a staggered vertical direction within the gravity settling chamber 140, the exhaust gas is forced to continuously change its flow direction as it flows from bottom to top, forming a meandering channel. Compared with the traditional straight-through settling chamber, this effectively prolongs the actual residence time of the exhaust gas in the chamber and increases the probability of collision between large-diameter droplets and PVC dust in the exhaust gas and the surface of the intercepting mesh 210, thereby improving the capture efficiency of the gravity settling unit 200. As the exhaust gas flows in a meandering manner, it impacts the interception mesh 210. Due to inertia, the denser particulate impurities and condensate droplets lose kinetic energy after impacting the mesh surface and fall directly to the bottom of the bin under the action of gravity. This method is especially suitable for PVC colored film exhaust gas with high initial concentration and wide particle size distribution, effectively preventing particles from escaping directly with the airflow. The floating grid 220, located at the junction of the gravity settling chamber 140 and the inertial separation chamber 150, serves two purposes: firstly, it rectifies and homogenizes the airflow after initial settling, providing a stable flow field for the inertial interception unit 300 above; secondly, the grid structure of the floating grid 220 itself can further intercept medium-sized particles that have not been captured by the mesh, and its position can also block the entrainment effect of the bottom turbulence on the settled dust, preventing secondary dust re-entrainment and ensuring the continuous and stable separation effect of the gravity settling chamber 140.

[0024] Further, please refer to Figure 3 and Figure 6 The inertial interception unit 300 includes a rotating shaft 310 fixed above the inertial separation chamber 150, and a fan-shaped swing plate 320 is rotatably mounted on the rotating shaft 310. Specifically, the fan-shaped swing plate 320 can swing back and forth up and down in the inertial separation chamber 150 around the rotating shaft 310. When the exhaust gas flows through the inertial separation chamber 150, the upward-flowing exhaust gas collides directly with the swinging fan-shaped swing plate 320, thereby breaking the airflow and changing its flow direction. At the same time, the airflow velocity is greatly reduced. The oily particles in the exhaust gas are also intercepted due to the inertial collision with the fan-shaped swing plate 320, thereby achieving the separation of oily particles in the exhaust gas.

[0025] It should be noted that the fan-shaped swing plate 320 continuously swings up and down within the inertial separation chamber 150 around the rotating shaft 310. Its moving surface causes oily particles in the exhaust gas to have multiple dynamic collisions with the interceptor plate per unit time, which greatly increases the collision probability. At the same time, the reciprocating motion of the fan-shaped swing plate 320 continuously changes the local flow field direction and velocity gradient, forcing oily dust to be more easily detached from the airflow and captured due to inertial effect. After the upward-flowing exhaust gas collides directly with the reciprocating oscillating fan-shaped vane 320, the airflow is violently sheared and dispersed, forming multiple turbulent flows. The original single upward channel is destroyed, and the overall flow velocity of the airflow drops significantly. The reduced flow velocity makes it difficult for the intercepted oily particles to be re-entrained and carried away. On the other hand, it provides a more uniform and low-speed flow field for the exhaust gas that is about to enter the centrifugal treatment chamber 160, thereby improving the capture accuracy of the terminal centrifugal separation unit 400. Oily dust in PVC colored film exhaust gas has strong adhesion and easily forms an oily sludge layer on the surface of static interception components, leading to blockage or efficiency reduction. The continuous up-and-down swing of the fan-shaped swing plate 320 uses inertial force and plate deformation to shake off or slip off the adhered oily particles, automatically maintaining the cleanliness of the plate surface.

[0026] Furthermore, please refer to Figure 3 and Figure 6A central transition chamber 170 is provided at the center of the inertial separation chamber 150. Several radial flow grooves 151 communicating with the central transition chamber 170 are opened circumferentially on the inner side of the inertial separation chamber 150. Several axial guide rods 330 are vertically arranged at the top of the central transition chamber 170. An annular pressure plate 340 that abuts against the fan-shaped swing plate 320 is slidably passed through the axial guide rods 330. A spring 350 is sleeved on the upper end of the axial guide rods 330. Specifically, the rising airflow in the inertial separation chamber 150, after colliding with the fan-shaped pendulum 320, changes its flow direction from axial to radial, and enters the central transition chamber 170 through the radial flow groove 151. The annular pressure plate 340 in the central transition chamber 170 slides periodically back and forth along the axial guide rod 330. When the annular pressure plate 340 slides downward along the axial guide rod 330, it can push the end of the fan-shaped pendulum 320 that extends into the central transition chamber 170 to swing downward, thereby causing the end of the fan-shaped pendulum 320 located in the inertial separation chamber 150 to swing upward. When the annular pressure plate 340 slides to the lower end of the axial guide rod 330 and returns, the end of the fan-shaped pendulum 320 located in the inertial separation chamber 150 can swing downward again and reset under the action of gravity. By repeating this process, the periodic swinging effect of the fan-shaped pendulum 320 can be achieved.

[0027] It is worth noting that after the exhaust gas collides with the fan-shaped swing plate 320, the flow direction changes from upward axial flow to radial flow, and enters the central transition chamber 170 through the radial flow channel 151. This path switching forces the oily particles to collide with the channel wall and the end of the swing plate due to inertia during the turning process, increasing the probability of the particles being intercepted. At the same time, the circumferential arrangement of the radial flow channel 151 realizes the uniform redistribution of airflow, avoiding local short circuits or flow deviation. The annular pressure plate 340 slides through the axial guide rod 330 and directly abuts against one end of the fan-shaped swing plate 320 that extends into the central transition chamber 170; when the annular pressure plate 340 slides downward, it actively pushes that end to swing downward, thereby causing the other end in the inertial separation chamber 150 to swing upward; when the annular pressure plate 340 returns to its original position and rises, the fan-shaped swing plate 320 naturally swings downward to its original position due to gravity; The reciprocating motion of the annular pressure plate 340 within the central transition chamber 170 is itself a dynamic interceptor. During its sliding process, it continuously changes the effective flow cross-section of the central transition chamber 170, generating a periodic compression and expansion effect on the exhaust gas that has entered the chamber, forming a local pulse airflow, which promotes further collision, agglomeration, or sedimentation of residual dust. At the same time, a shearing action can be generated between the edge of the pressure plate and the chamber wall, effectively separating oily substances adhering to the wall surface.

[0028] Additionally, please see Figure 3 and Figure 6The top of the housing 100 is equipped with a drive motor 180. The output end of the drive motor 180 is connected to a rotating drum 190 that vertically penetrates the centrifugal processing chamber 160, the central transition chamber 170 and the gravity settling chamber 140 in sequence. An inner flow channel 191 is opened inside the rotating drum 190. Several air inlet slots 192 that communicate with the central transition chamber 170 are opened circumferentially on the lower side wall of the inner flow channel 191. The upper end of the inner flow channel 191 is connected to the centrifugal separation unit 400. Specifically, the exhaust gas that flows radially into the central transition chamber 170 through the inertial separation chamber 150 then flows axially downward along the central transition chamber 170 for a certain distance. Then, the airflow enters the inner flow channel 191 through each air inlet slot 192 and enters the centrifugal separation unit 400 axially upward along the inner flow channel 191.

[0029] Please see Figure 6 The outer circumferential surface of the rotating drum 190 is provided with a spiral groove 360, and the inner side of the annular pressure plate 340 is provided with a sliding cavity 341. A sliding pin 342 adapted to the spiral groove 360 ​​is radially slidably embedded in the sliding cavity 341. Specifically, the sliding pin 342 can move radially within the sliding cavity 341. When the annular pressure plate 340 is at the lowest end of the axial guide rod 330, the sliding pin 342 extends and engages in the spiral groove 360. In this way, while the drive motor 180 drives the rotating drum 190 to rotate, it can drive the sliding pin 342 to move synchronously within the spiral groove 360, thereby driving the annular pressure plate 340 to slide upward along the axial guide rod 330. Under the action of gravity, one end of the fan-shaped swing plate 320 located in the inertial separation chamber 150 is subjected to gravity. Gradually swinging downwards; when the annular pressure plate 340 slides to the uppermost end of the axial guide rod 330, the sliding pin 342 also just reaches the upper end of the spiral groove 360 ​​and disengages from the spiral groove 360 ​​and retracts into the sliding cavity 341. At this time, the annular pressure plate 340 is unlocked from the rotating cylinder 190, and can slide down and reset again under the elastic force of the spring 350, so as to drive the end of the fan-shaped swing plate 320 located in the inertial separation chamber 150 to swing upwards; repeating this process, the reciprocating swing effect of the fan-shaped swing plate 320 can be achieved.

[0030] Accordingly, please refer to Figure 6 The lower end of the spiral groove 360 ​​is provided with a magnetic block 361 for magnetically attracting the sliding pin 342, and the upper end of the spiral groove 360 ​​is provided with an air blowing hole 362 that communicates with the interior of the inner flow channel 191. Specifically, when the sliding pin 342 is located at the lower end of the spiral groove 360, the magnetic block 361 magnetically attracts the sliding pin 342, thereby causing the sliding pin 342 to extend from the sliding cavity 341 and be inserted into the spiral groove 360, thus locking the annular pressure plate 340 and the rotating drum 190. Subsequently, the annular pressure plate 340 can be driven to climb axially by the rotating drum 190. When the sliding pin 342 is located at the upper end of the spiral groove 360, some of the waste gas in the inner flow channel 191 is blown out from the air blowing hole 362, thereby generating an airflow impact on the sliding pin 342, causing the sliding pin 342 to disengage from the spiral groove 360 ​​and retract into the sliding cavity 341, so that the annular pressure plate 340 can slide down and reset again.

[0031] It should be noted that the rotating drum 190 connected to the output end of the drive motor 180 serves as both a gas delivery channel for exhaust gas to enter the centrifugal separation unit 400 from the central transition chamber 170 and a channel for actively controlling the reciprocating motion of the annular pressure plate 340 through the spiral groove 360 ​​on its outer circumference and the sliding pin 342, thereby driving the fan-shaped swing plate 320 to swing periodically. When the drum 190 rotates, the sliding pin 342, which extends out and is inserted into the spiral groove 360, moves along the spiral trajectory, forcing the annular pressure plate 340 to slide upward at a constant speed along the axial guide rod 330. When the annular pressure plate 340 is at the lowest end of the axial guide rod 330, the magnetic block 361 at the lower end of the spiral groove 360 ​​generates a magnetic attraction force on the sliding pin 342, forcing the sliding pin 342 to extend radially from the sliding cavity 341 and be inserted into the spiral groove 360, thus ensuring reliable locking between the annular pressure plate 340 and the drum 190 at the start of the climb. When the annular pressure plate 340 climbs to the uppermost end of the axial guide rod 330, the sliding pin 342 is exactly located at the upper end of the spiral groove 360. At this time, some of the waste gas in the inner flow channel 191 is ejected through the air blowing hole 362 and directly impacts the end face of the sliding pin 342, generating sufficient aerodynamic force to push the sliding pin 342 back into the sliding cavity 341, so that it is separated from the spiral groove 360. The inner flow channel 191 inside the rotating drum 190 is connected to the central transition chamber 170 at the lower end through the air inlet slot 192 and to the centrifugal separation unit 400 at the upper end, which efficiently completes the axial transportation of waste gas from the radial collection area to the centrifugal treatment chamber 160. Under the active control of the drive motor 180, the fan-shaped swing plate 320 can maintain a stable up-and-down swing without relying on the airflow intensity. Even when the production line is operating at a low load and the exhaust gas volume is small, the mechanism can still maintain an effective swing collision frequency, overcoming the defect of the pure passive inertial interception device that suffers a sharp drop in efficiency at low flow rates. At the same time, the periodic shaking and shearing force generated by the active swing can peel off the adhering sludge in time and prevent blockage. It is especially suitable for the harsh working conditions of PVC color film production, where the exhaust gas volume fluctuates greatly and the oil particles are highly adhesive.

[0032] In yet another embodiment, please refer to Figure 7The centrifugal separation unit 400 includes a conical separation cover 410 coaxially fixed around the rotating drum 190. The side wall of the conical separation cover 410 is provided with a plurality of separation holes 420. The upper end of the inner flow channel 191 is provided with a plurality of exhaust grooves 193 that communicate with the inside of the conical separation cover 410. Specifically, the exhaust gas in the inner flow channel 191 flows into the conical separation hood 410 through each exhaust slot 193. The conical separation hood 410 rotates synchronously with the rotating drum 190, so that the particles in the exhaust gas can adhere to the inner wall of the conical separation hood 410 under centrifugal action. The gas passes through each separation hole 420 from the conical separation hood 410 and enters the centrifugal treatment chamber 160. Finally, the exhaust gas, after multi-stage treatment, is discharged from the exhaust port 120 on one side of the centrifugal treatment chamber 160.

[0033] It is worth noting that the conical separation hood 410 is coaxially fixed to the periphery of the rotating drum 190 and rotates synchronously with the rotating drum 190. After the exhaust gas enters the interior of the conical separation hood 410 through the inner flow channel 191 and the exhaust groove 193, it is subjected to the strong centrifugal force field generated by the high-speed rotation. The residual submicron fine particles in the exhaust gas (including oily aerosols and PVC dust that were not completely captured by the first two stages) are thrown to the inner wall of the conical separation hood 410 and adhere to and deposit there. The purified gas then passes through the separation hole 420 and enters the centrifugal treatment chamber 160. The conical separation hood 410 adopts a conical configuration that is smaller at the top and larger at the bottom. Its inclined inner wall causes the particles attached to the wall surface to automatically slide downward under the combined action of the tangential component of centrifugal force and the axial component of gravity, avoiding the accumulation of particles on the wall surface into a thick layer and then being stripped off by the airflow. The separation hole 420 is opened on the side wall of the conical separation hood 410. Its hole size has been optimized to allow gas molecules to pass through smoothly, but to effectively block solid or liquid droplet particles. Under high-speed rotation, particles that have not yet attached to the wall surface are thrown towards the wall between the holes by centrifugal force instead of facing the hole opening directly, reducing the probability of particles passing through directly. In addition, the tangential airflow generated by the rotation forms a continuous sweeping effect on the periphery of the hole opening, which can prevent fine oily particles from clogging the separation hole 420 and maintain long-term flow stability.

[0034] Further, please refer to Figure 8 The gravity settling chamber 140 is also equipped with a spray unit 500. The spray unit 500 includes an adsorption chamber 510 located at the bottom of the gravity settling chamber 140. An inlet 530 is provided on one side of the adsorption chamber 510. A partition 520 is fixed inside the adsorption chamber 510. An extrusion chamber 550 is formed above the partition 520. A communication port 540 communicating with the adsorption chamber 510 is provided on the side of the extrusion chamber 550 away from the inlet 530. Specifically, spray water is drawn into the adsorption chamber 510 from the inlet 530, and then the spray water is pressed into the extrusion chamber 550 from the connecting port 540. Finally, the spray water is sprayed upward from the extrusion chamber 550 into the gravity settling chamber 140, thereby spraying the exhaust gas and promoting the effective separation of dust particles in the exhaust gas.

[0035] It should be noted that the spray unit 500 is directly installed at the bottom of the gravity settling chamber 140, sharing the same chamber with dry settling components such as the intercepting mesh 210 and the floating grid 220. Spray water is sprayed upward from the extrusion chamber 550. On the one hand, water droplets are used to capture medium and fine particles and oily aerosols in the exhaust gas. On the other hand, the moistened walls and mesh can adsorb more dust. The adsorption chamber 510 and the extrusion chamber 550 are separated by a partition 520, with the connecting port 540 serving as the sole flow channel. After the adsorption chamber 510 draws in spray water from the inlet 530, the water is then forced through the connecting port 540 into the extrusion chamber 550 and sprayed upwards. The intercepting mesh 210 and the floating grid 220 in the gravity settling unit 200 are prone to sticky blockage due to long-term handling of high-concentration PVC dust and condensate droplets. The water mist or water column sprayed upwards from the bottom can directly wash the surface of the above components, flushing the attached sludge and dust to the sedimentation area at the bottom of the chamber, ensuring the stable and low-resistance operation of the gravity settling chamber 140 under continuous production conditions. PVC colored film exhaust gas usually has a high temperature (such as exhaust gas discharged from the drying section). High temperature makes it easy for oily components to evaporate or reduce particle stickiness. The evaporation of spray water can effectively reduce the temperature of exhaust gas and increase the relative humidity, making oily dust more likely to agglomerate and grow or become sticky, thereby improving the capture efficiency of oily particles by the inertial interception unit 300.

[0036] Furthermore, please refer to Figure 8 The rotating drum 190 is provided with a number of turbine blades 560 at one end that extends into the adsorption chamber 510. The rotating drum 190 is also fixedly provided with a turntable 570 that is rotatably and sealingly connected to the upper opening of the extrusion chamber 550. The turntable 570 is provided with a number of spray holes 580 in the circumferential direction. Specifically, the rotating drum 190 drives the turbine blades 560 to rotate continuously, thereby generating a negative pressure on the side of the adsorption chamber 510 near the inlet 530, which draws the spray water in the inlet 530 into the adsorption chamber 510. At the same time, a positive pressure is generated on the side of the adsorption chamber 510 near the connecting port 540, which forces the spray water in the adsorption chamber 510 into the extrusion chamber 550 through the connecting port 540, and finally sprays it upward from each spray hole 580 into the gravity settling chamber 140.

[0037] It is worth noting that the turbine blades 560 rotate at high speed with the rotating drum 190, generating a negative pressure on the side near the water inlet 530, which automatically draws the sprayed water into the adsorption chamber 510; and generating a positive pressure on the side near the connecting port 540, which forces the water through the connecting port 540 into the squeezing chamber 550. The turntable 570 is fixed on the rotating drum 190 and is rotated and sealed to the upper opening of the extrusion chamber 550 to prevent high-pressure water from leaking out of the gap. Several spray holes 580 opened circumferentially on the turntable 570 serve as the final water outlet. The pressurized water in the extrusion chamber 550 can only be sprayed upward at high speed from the spray holes 580 to form a uniform and fine atomized water curtain or water column, which efficiently converts the pressure generated by the turbine blades 560 into spray kinetic energy, ensuring that the water mist can fully contact the rising exhaust gas and improve the washing efficiency. As the turntable 570 rotates with the rotating drum 190, the water jets sprayed from the spray holes 580 are distributed in a rotating and scattering manner under the combined action of centrifugal force and initial spray velocity, which uniformly sweeps the gravity settling chamber 140 in a circumferential direction, eliminating blind spots for dust accumulation, and at the same time making the contact between water mist and exhaust gas more uniform and sufficient.

[0038] The specific embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A waste gas treatment device for PVC color film production, characterized in that, include: The shell (100) has an air inlet (110) on one side of its bottom and an exhaust outlet (120) on one side of its top. The shell (100) also has a viewing window (130) on one side of its bottom. The shell (100) contains a gravity settling chamber (140), an inertial separation chamber (150) and a centrifugal processing chamber (160) arranged from bottom to top. Gravity settling unit (200), which is installed in gravity settling chamber (140), is used to intercept and separate large-diameter liquid droplets and PVC dust in the exhaust gas by gravity settling. An inertial interception unit (300) is installed inside an inertial separation chamber (150) and is used to intercept oily dust particles in the exhaust gas by inertial collision. Centrifugal separation unit (400), which is located in centrifugal processing chamber (160), is used to capture fine particles in exhaust gas.

2. The PVC color film production waste gas treatment device according to claim 1, characterized in that, The gravity settling unit (200) includes an intercepting mesh (210) disposed in the gravity settling chamber (140) and an upward-floating grid (220) located at the junction of the gravity settling chamber (140) and the inertial separation chamber (150). The intercepting mesh (210) and the upward-floating grid (220) are staggered in the vertical direction.

3. The PVC color film production waste gas treatment device according to claim 1, characterized in that, The inertial interception unit (300) includes a rotating shaft (310) fixed above the inertial separation chamber (150), and a fan-shaped swing plate (320) is rotatably mounted on the rotating shaft (310).

4. The PVC color film production waste gas treatment device according to claim 3, characterized in that, A central transition chamber (170) is provided at the center of the inertial separation chamber (150). Several radial flow grooves (151) communicating with the central transition chamber (170) are provided on the inner circumferential side of the inertial separation chamber (150). Several axial guide rods (330) are vertically provided at the top of the central transition chamber (170). An annular pressure plate (340) that abuts against the fan-shaped swing plate (320) is slidably passed through the axial guide rods (330). A spring (350) is sleeved on the upper end of the axial guide rods (330).

5. The PVC color film production waste gas treatment device according to claim 4, characterized in that, A drive motor (180) is installed on the top of the housing (100). The output end of the drive motor (180) is connected to a rotating drum (190) that vertically penetrates the centrifugal processing chamber (160), the central transition chamber (170), and the gravity settling chamber (140) in sequence. An inner flow channel (191) is provided inside the rotating drum (190). Several air inlet slots (192) communicating with the central transition chamber (170) are provided circumferentially on the lower side wall of the inner flow channel (191). The upper end of the inner flow channel (191) is connected to the centrifugal separation unit (400).

6. The PVC color film production waste gas treatment device according to claim 5, characterized in that, The outer circumferential surface of the rotating drum (190) is provided with a spiral groove (360), and the inner side of the annular pressure plate (340) is provided with a sliding cavity (341). A sliding pin (342) adapted to the spiral groove (360) is radially slidably embedded in the sliding cavity (341).

7. The PVC color film production waste gas treatment device according to claim 6, characterized in that, The lower end of the spiral groove (360) is provided with a magnetic block (361) for magnetically attracting the sliding pin (342), and the upper end of the spiral groove (360) is provided with an air blowing hole (362) that communicates with the interior of the inner flow channel (191).

8. The PVC color film production waste gas treatment device according to claim 5, characterized in that, The centrifugal separation unit (400) includes a conical separation hood (410) coaxially fixed around the drum (190). The side wall of the conical separation hood (410) is provided with a number of separation holes (420). The upper end of the inner flow channel (191) is provided with a number of exhaust grooves (193) that communicate with the inside of the conical separation hood (410).

9. The PVC color film production waste gas treatment device according to claim 5, characterized in that, The gravity settling chamber (140) is also equipped with a spray unit (500). The spray unit (500) includes an adsorption chamber (510) located at the bottom of the gravity settling chamber (140). An inlet (530) is provided on one side of the adsorption chamber (510). A partition (520) is fixed inside the adsorption chamber (510). A squeezing chamber (550) is formed above the partition (520). A communication port (540) communicating with the adsorption chamber (510) is provided on the side of the squeezing chamber (550) away from the inlet (530).

10. A PVC color film production waste gas treatment device according to claim 9, characterized in that, The rotating drum (190) is provided with a number of turbine blades (560) at one end that extends into the adsorption chamber (510). The rotating drum (190) is also fixedly provided with a turntable (570) that is rotatably and sealed to the upper opening of the extrusion chamber (550). The turntable (570) is provided with a number of spray holes (580) in the circumferential direction.

Images