An off-gas scrubbing tower applicable to water-containing PVC particles

Abstract

The present application discloses an exhaust gas scrubbing tower applicable to water-containing PVC particles, which relates to the technical field of exhaust gas scrubbing. An exhaust port is arranged at the top of the shell body, an air inlet and a liquid discharge port are arranged on the side wall, and a drain port is arranged at the bottom, wherein the liquid discharge port is arranged below the air inlet; a wire mesh demister, a water spraying device, a Tesla multiphase separation plate and a water atomizing device are sequentially arranged from top to bottom along the height direction of the inner cavity of the shell body, wherein a plurality of Tesla valve channels are arranged on the Tesla multiphase separation plate; the water atomizing device is arranged above the exhaust port; a raw material gas particle monitoring instrument is arranged between the air inlet and the control console; the water atomizing device is connected with the control console through a first valve, and the water spraying device is connected with the control console through a second valve. Therefore, through the synergistic effect of the water atomizing device, the Tesla multiphase separation plate, the wire mesh demister and the intelligent control system, the efficient purification of the exhaust gas of the water-containing PVC particles is realized in the present application.

Description

Technical Field

[0001] This application relates to the technical field of tail gas washing, and particularly to a tail gas washing tower suitable for water-containing PVC particles. Background Art

[0002] Polyvinyl chloride (PVC), as an important thermoplastic, is widely used in multiple fields such as construction, packaging, wire and cable, etc. During the production process of PVC, a large amount of tail gas containing micron-sized to sub-micron-sized water-containing PVC particles will be generated after the wet materials are dried in a fluidized bed. If these tail gases are directly discharged into the atmosphere without effective treatment, it will not only significantly increase the concentration of suspended particulate matter (PM) in the atmosphere, causing serious environmental pollution, but also bring non-negligible economic losses to production enterprises due to the loss of PVC raw materials.

[0003] Currently, the commonly used tail gas purification device in the industry is mainly the traditional spray washing tower. The working principle of the spray washing tower is to use the inertial collision mechanism between droplets and particles to capture the particulate matter in the tail gas. However, this mechanism has a sharp drop in efficiency when capturing particles with a diameter less than 10 microns, and the capture efficiency is often lower than 60%. This means that a large number of fine PVC particles will still be discharged into the atmosphere with the tail gas, resulting in the concentration of PVC particles exceeding the current environmental protection regulations when the tail gas is discharged, and unable to meet the increasingly strict environmental protection requirements. Summary of the Invention

[0004] The embodiments of this application solve the problems raised in the background art by providing a tail gas washing tower suitable for water-containing PVC particles.

[0005] An embodiment of the present application provides a tail gas scrubbing tower applicable to water-containing PVC particles, which includes a housing, a Tesla multiphase separation plate, a water atomization device, a wire mesh demister, a water spray device, and a control console. The housing has an exhaust port at the top, an air inlet and a drain port on the side wall, and a drain outlet at the bottom. Among them, the drain port is arranged below the air inlet. The wire mesh demister, the water spray device, the Tesla multiphase separation plate, and the water atomization device are sequentially arranged from top to bottom along the height direction of the inner cavity of the housing. Among them, the Tesla multiphase separation plate is provided with a plurality of Tesla valve channels, and the resistance coefficient of the medium flowing downward through the Tesla valve channels is small, while the resistance coefficient of the medium flowing upward is large. Among them, the water atomization device is arranged above the air inlet. A raw gas particle monitoring instrument is arranged between the air inlet and the control console. An exhaust gas outlet particle monitoring instrument and a flow rate monitoring instrument are arranged between the exhaust port and the control console. The water atomization device is connected to the control console through a first valve, and the water spray device is connected to the control console through a second valve. The control console is configured to: dynamically adjust the opening degree of the first valve according to the inlet particle concentration and particle size distribution data fed back by the raw gas particle monitoring instrument to control the atomized droplet flux; obtain the exhaust gas outlet particle concentration and air flow velocity data in real time through the exhaust gas outlet particle monitoring instrument and the flow rate monitoring instrument, and when the deviation between the air flow velocity at the exhaust port and the air flow velocity at the air inlet is detected to exceed a set threshold, open the second valve to start the water spray device to remove the accumulated particle impurities in the Tesla valve channels.

[0006] In a possible implementation manner, the tail gas scrubbing tower applicable to water-containing PVC particles further includes a brush water absorption plate device arranged in the inner cavity of the housing, and the brush water absorption plate device is located between the air inlet and the drain port. The brush water absorption plate device includes an annular substrate, a grid, and a plurality of water absorption brushes. The annular substrate is detachably connected to the inner wall of the housing and has a cavity structure with both ends open. The grid is arranged in the cavity structure, and a plurality of the water absorption brushes are arranged at the bottom of the grid. The annular substrate is provided with a plurality of diversion holes, and the diversion holes extend along a spiral direction for guiding the medium and scraping the PVC particles adhered to the inner wall of the housing.

[0007] In a possible implementation manner, the top wall of the annular substrate is a first inclined surface that slopes from its outer side wall towards the grid.

[0008] In a possible implementation, the Tesla valve channel includes a plurality of passage units arranged alternately, and each passage unit includes a main channel, a first branch channel, and a second branch channel; the top end of the main channel bifurcates into the first branch channel and the second branch channel, wherein the first branch channel is a straight inclined channel, the second branch channel is a semi-circular curved channel, and the ends of the first branch channel and the second branch channel meet at the bottom end of the adjacent main channel.

[0009] In a possible implementation, the tail gas scrubbing tower applicable to water-containing PVC particles further includes a partition plate, a water collection cylinder, a diversion assembly, a first fixed pulley, a plugging assembly, a pushing member, a stretching member, a limiting plate, and a plurality of first elastic members; it also includes a partition plate, a water collection cylinder, a diversion assembly, a first fixed pulley, a plugging assembly, a pushing member, a stretching member, a limiting plate, and a plurality of first elastic members; the Tesla multiphase separation plate is rotatably connected to the inner wall of the housing; the partition plate is detachably arranged on the inner wall of the housing, and the end of the Tesla multiphase separation plate away from the housing is slidably connected to the end of the partition plate away from the inner wall of the housing; the partition plate is a hollow structure with openings at both ends; the water collection cylinder is slidably connected inside the hollow structure, and a plugging assembly is arranged at its bottom; both ends of the plurality of first elastic members are respectively connected to the bottom of the water collection cylinder and the inner bottom wall of the partition plate; the diversion assembly is arranged on the top wall of the water atomizing device and is respectively oriented towards the inner wall of the housing, and the pushing member is arranged on the side of the diversion assembly away from the water atomizing device and extends into the hollow structure for pushing open the plugging assembly when the water collection cylinder descends, so that the medium in the water collection cylinder flows towards the diversion assembly to wash the PVC particles on the inner wall of the housing; the first fixed pulley is arranged on the side of the partition plate away from the diversion assembly; one end of the stretching member is connected to the top of the water collection cylinder, and the other end is wound around the first fixed pulley and then connected to the top of the Tesla multiphase separation plate; the limiting plate is arranged on the side of the partition plate away from the inner wall of the housing and is located below the partition plate; when the Tesla multiphase separation plate is horizontally placed, its bottom abuts against the top of the limiting plate, at this time the stretching member between the first fixed pulley and the Tesla multiphase separation plate is in a relaxed state, and the Tesla multiphase separation plate, the partition plate, and the water collection cylinder form a sealed structure.

[0010] In a possible implementation, the tail gas scrubbing tower applicable to water-containing PVC particles further includes a magnetic attraction assembly; the magnetic attraction assembly is arranged between the Tesla multiphase separation plate and the limiting plate for adsorbing the Tesla multiphase separation plate to the limiting plate to prevent the tail gas from blowing the Tesla multiphase separation plate.

[0011] In a possible implementation, the tail gas scrubbing tower applicable to water-containing PVC particles further includes a second fixed pulley and a third fixed pulley; the second fixed pulley and the third fixed pulley are respectively arranged on the side of the partition plate away from the diversion assembly and on both sides of the first fixed pulley. The second fixed pulley faces the water collecting cylinder, and the third fixed pulley faces the Tesla multiphase separation plate; one end of the stretching member is connected to the top of the water collecting cylinder, and the other end thereof is successively wound around the second fixed pulley, the first fixed pulley and the third fixed pulley and then connected to the top of the Tesla multiphase separation plate; the second fixed pulley and the third fixed pulley are respectively used to make the stretching member act vertically on the water collecting cylinder and the Tesla multiphase separation plate; the projection of the third fixed pulley on the horizontal plane partially coincides with the projection of the Tesla multiphase separation plate to limit the moving height of the Tesla multiphase separation plate.

[0012] In a possible implementation, the plugging assembly includes a plug, a limiting member and a second elastic member; a water leakage port is arranged at the bottom of the water collecting cylinder, and the plug is inserted into the water leakage port; the limiting member is fixedly connected to the top wall of the plug; two ends of the second elastic member are respectively connected to the limiting member and the inner side of the water leakage port; the cross-sectional area of the top wall of the pushing member is smaller than the area of the water leakage port, and the top end of the pushing member can pass through the water leakage port and push open the plug.

[0013] In a possible implementation, the diversion assembly includes a fixed shaft, a diversion member, a funnel and a plurality of diversion vanes; the fixed shaft is fixedly arranged in the middle of the top wall of the water atomization device, and the plurality of diversion vanes are rotatably arranged along the circumference of the fixed shaft and are inclined towards the inner wall of the housing; one end of the diversion member is connected to the top wall of the fixed shaft, and the other end is connected to one end of the funnel; the other end of the funnel extends into the hollow structure and is provided with the pushing member; the funnel is used for receiving the medium in the water collecting cylinder and guiding the medium to the diversion vanes through the diversion member.

[0014] In a possible implementation, the top wall of the partition plate is a second inclined surface inclined from its outer side wall towards the Tesla multiphase separation plate; a plurality of water leakage holes are arranged in the edge area of the Tesla multiphase separation plate, the water leakage holes are close to the inner wall of the housing, and a first one-way valve is arranged in the water leakage holes. The first one-way valve is configured to only allow the medium to flow from top to bottom; the water leakage holes are used for discharging the liquid drops accumulated in the Tesla valve channel to the bottom of the housing through the first one-way valve.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0016] The tail gas scrubbing tower applicable to water-containing PVC particles provided by the present application includes a shell, a Tesla multiphase separation plate, a water atomization device, a wire mesh demister, a water spraying device and a control console. The working principle is as follows: When the tail gas scrubbing tower is started, the tail gas containing water-containing PVC particles enters the shell through the air inlet on the side wall of the shell. The raw gas particle monitoring instrument installed at the air inlet monitors the particle concentration and particle size distribution in the tail gas in real time and transmits the data to the control console. The control console dynamically adjusts the opening degree of the first valve according to the particle monitoring data to control the atomized droplet flux of the water atomization device. The water atomization device sprays water into tiny droplets, and these droplets contact the tail gas countercurrently. Through the gas-liquid-solid three-phase mixing effect, the larger droplets and multi-particle PVC droplets settle to the bottom of the shell under the action of gravity. The smaller particles that have not settled rise with the air flow and enter the Tesla multiphase separation plate. The Tesla valve channels arranged inside the Tesla multiphase separation plate utilize the vortex self-dissipation effect of the fluid to increase the flow resistance and reduce the flow velocity, promoting the full fusion of PVC particles and droplets. The special one-way flow structure of the Tesla valve channels significantly increases the contact area between the solid wall and the liquid. The fused particle droplets adhere to the solid wall to form a liquid film, while the gas can continue to flow upward along the middle area. The liquid film converges downward along the solid wall under the action of gravity and finally reaches the bottom of the shell.

[0017] The gas treated by the Tesla multiphase separation plate rises to the wire mesh demister to further capture droplets and prevent water resource loss. The purified gas is discharged through the exhaust port at the top of the shell.

[0018] The exhaust gas outlet particle monitoring instrument and the flow velocity monitoring instrument installed at the exhaust port monitor the particle concentration and the air flow velocity in real time and feedback the data to the control console. The control console dynamically adjusts the opening degree of the first valve according to the particle data and the principle of conservation of drag and gravity to ensure stable separation effect.

[0019] When it is detected that the deviation between the air flow velocity at the exhaust port and the air flow velocity at the air inlet exceeds the set threshold, the control console determines that the Tesla valve channel is blocked and promptly prompts the staff. At this time, the control console automatically opens the second valve and starts the water spraying device for on-line cleaning. Due to the one-way flow characteristic of the Tesla valve channel (small downward resistance), the cleaning liquid can efficiently remove the accumulated particle impurities without stopping the machine to replace the equipment.

[0020] Therefore, through the synergistic effect of the water atomization device, the Tesla multiphase separation plate, the wire mesh demister and the intelligent control system, the present application realizes the efficient purification of the tail gas containing water-containing PVC particles. This tail gas scrubbing tower has significant advantages such as high efficiency, stability and easy maintenance. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments of the present application. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of an off-gas scrubbing tower applicable to water-containing PVC particles provided by an embodiment of the present application;

[0023] Figure 2 It is a schematic structural diagram when the Tesla multiphase separation plate provided by an embodiment of the present application rotates;

[0024] Figure 3 For Figure 1 Local enlarged view of part A;

[0025] Figure 4 For Figure 2 Local enlarged view of part B;

[0026] Figure 5 For Figure 2 Local enlarged view of part C;

[0027] Figure 6 It is a schematic structural diagram of a brush water-absorbing plate device provided by an embodiment of the present application.

[0028] Icon: 1 - housing; 11 - exhaust port; 12 - intake port; 13 - drain port; 14 - drain-out port; 2 - Tesla multiphase separation plate; 21 - Tesla valve channel; 211 - passage unit; 2111 - main channel; 2112 - first branch channel; 2113 - second branch channel; 22 - water leakage hole; 23 - first check valve; 3 - water atomizing device; 4 - wire mesh demister; 5 - water spraying device; 6 - brush water-absorbing plate device; 61 - annular substrate; 611 - diversion hole; 62 - grille; 63 - water-absorbing brush; 7 - control console; 71 - raw gas particle monitoring instrument; 72 - waste gas outlet particle monitoring instrument; 73 - flow rate monitoring instrument; 74 - first valve; 75 - second valve; 8 - partition plate; 9 - water collecting cylinder; 10 - first fixed pulley; 101 - diversion assembly; 1011 - fixed shaft; 1012 - diversion member; 1013 - funnel; 1014 - diversion vane; 102 - plugging assembly; 1021 - plug; 1022 - limiting member; 1023 - second elastic member; 103 - pushing member; 104 - stretching member; 105 - limiting plate; 106 - magnetic attraction assembly; 107 - first elastic member; 108 - second fixed pulley; 109 - third fixed pulley. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0030] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0031] The embodiments of the present application provide an exhaust gas scrubbing tower applicable to water-containing PVC particles, as Figures 1 to 6As shown in the figure. An exhaust port 11 is provided at the top of the housing 1, an air inlet 12 and a liquid discharge port 13 are provided on the side wall, and a drain port 14 is provided at the bottom. Among them, the liquid discharge port 13 is arranged below the air inlet 12. A wire mesh demister 4, a water spray device 5, a Tesla multiphase separation plate 2 and a water atomization device 3 are sequentially arranged from top to bottom along the height direction of the inner cavity of the housing 1. Among them, the Tesla multiphase separation plate 2 is provided with a plurality of Tesla valve channels 21. The Tesla valve channels 21 have a small resistance coefficient when the medium flows downward and a large resistance coefficient when flowing upward. Among them, the water atomization device 3 is arranged above the air inlet 12. A raw gas particle monitoring instrument 71 is arranged between the air inlet 12 and the control console 7. An exhaust gas outlet particle monitoring instrument 72 and a flow rate monitoring instrument 73 are arranged between the exhaust port 11 and the control console 7. The water atomization device 3 is connected to the control console 7 through a first valve 74, and the water spray device 5 is connected to the control console 7 through a second valve 75. The control console 7 is configured to: dynamically adjust the opening of the first valve 74 according to the particle concentration and particle size distribution data of the air inlet 12 fed back by the raw gas particle monitoring instrument 71 to control the atomized droplet flux; obtain the particle concentration and air flow velocity data of the exhaust port 11 in real time through the exhaust gas outlet particle monitoring instrument 72 and the flow rate monitoring instrument 73. When the deviation between the air flow velocity of the exhaust port 11 and the air flow velocity of the air inlet 12 is detected to exceed the set threshold, the second valve 75 is opened to start the water spray device 5 to remove the accumulated particle impurities in the Tesla valve channels 21.

[0032] Furthermore, the air flow velocity of the air inlet 12 in this application is known and can be determined according to information such as the flow rate, temperature, and pressure of the air inlet 12.

[0033] Specifically, the design of the Tesla valve channels 21 enables the medium (fluid) to have a small resistance when flowing in one direction and a significantly increased resistance when flowing in the opposite direction. Forward flow (i.e., downward flow): When the fluid flows along the forward direction (low resistance direction), the design of the Tesla valve channels 21 enables the fluid to pass through smoothly with less energy loss. Reverse flow (i.e., upward flow): When the fluid attempts to flow in the reverse direction, the Tesla valve channels 21 will cause the fluid to generate turbulence, eddy currents, and energy dissipation, thereby significantly increasing the flow resistance, restricting the reverse flow, and achieving the effects of reducing the flow velocity, increasing the agglomeration time and efficiency of particles and droplets.

[0034] It should be noted that when the tail gas scrubbing tower is started, the tail gas containing water-containing PVC particles enters the interior of the housing 1 through the air inlet 12 on the side wall of the housing 1. The raw gas particle monitoring instrument 71 installed at the air inlet 12 monitors the particle concentration and particle size distribution in the tail gas in real time and transmits the data to the console 7. Based on the particle monitoring data, the console 7 dynamically adjusts the opening degree of the first valve 74 to control the atomized droplet flux of the water atomizing device 3. The water atomizing device 3 sprays water into tiny droplets, and these droplets come into countercurrent contact with the tail gas. Through the gas-liquid-solid three-phase mixing effect, the larger droplets and multi-particle PVC droplets settle to the bottom of the housing 1 under the action of gravity. The smaller particles that do not settle rise with the air flow and enter the Tesla multiphase separation plate 2. The Tesla valve channels 21 arranged inside the Tesla multiphase separation plate 2 utilize the vortex self-dissipation effect of the fluid to increase the flow resistance and reduce the flow rate, promoting the full fusion of PVC particles and droplets. The special unidirectional flow structure of the Tesla valve channels 21 significantly increases the contact area between the solid wall and the liquid. The fused particle droplets adhere to the solid wall to form a liquid film, while the gas can continue to flow upward along the middle region. The liquid film converges downward along the solid wall under the action of gravity and finally reaches the bottom of the housing 1.

[0035] Although most of the PVC particles and droplets have been removed from the gas processed by the Tesla multiphase separation plate 2, it may still carry a small amount of tiny droplets. To ensure the purity of the discharged gas, the gas rises to the wire mesh demister 4. The wire mesh demister 4 adopts a special wire mesh material and structural design, which can efficiently capture these tiny droplets, prevent water resources from being lost with the gas discharge, and provide a strong guarantee for the final purification of the tail gas. The purified gas is discharged through the exhaust port 11 at the top of the housing 1. To ensure that the discharged gas meets strict environmental protection standards, an exhaust gas outlet particle monitoring instrument 72 and a flow rate monitoring instrument 73 are installed at the exhaust port 11 to monitor the particle concentration and air flow velocity at the exhaust port 11 in real time and feedback the data to the console 7. The console 7 dynamically adjusts the opening degree of the first valve 74 according to the received particle data, combined with the principle of drag and gravity conservation, and uses an advanced intelligent algorithm to ensure that the separation effect of the entire separation system always remains stable.

[0036] When it is detected that the deviation between the air flow velocity at the exhaust port 11 and the flow velocity at the air inlet 12 exceeds the set threshold, the console 7 determines that the Tesla valve channels 21 are blocked and promptly notifies the staff. At this time, the console 7 automatically opens the second valve 75 to start the water spray device 5 for online cleaning. Due to the unidirectional flow characteristic of the Tesla valve channels 21 (small downward resistance), the cleaning liquid can efficiently remove the accumulated particle impurities without shutting down the equipment for replacement.

[0037] Therefore, through the synergistic effect of the water atomization device 3, the Tesla multiphase separation plate 2, the wire mesh demister 4, and the intelligent control system in this application, the efficient purification of the tail gas containing water-containing PVC particles is achieved. This tail gas scrubber has significant advantages such as high efficiency, stability, and easy maintenance.

[0038] In the embodiment of this application, the tail gas scrubber applicable to water-containing PVC particles further includes a brush water absorption plate device 6 arranged in the inner cavity of the housing 1, and the brush water absorption plate device 6 is located between the air inlet 12 and the liquid discharge port 13. The brush water absorption plate device 6 includes an annular substrate 61, a grid 62, and a plurality of water absorption brushes 63. The annular substrate 61 is detachably connected to the inner wall of the housing 1 and has a cavity structure with both ends open. A grid 62 is arranged in the cavity structure, and a plurality of water absorption brushes 63 are arranged at the bottom of the grid 62. The annular substrate 61 is provided with a plurality of diversion holes 611, and the diversion holes 611 extend along a spiral direction for guiding the medium and scraping off the PVC particles adhered to the inner wall of the housing 1.

[0039] It should be noted that the water droplets generated during the tail gas treatment process flow into the bottom of the housing 1 through the gaps of the grid 62. A water absorption brush 63 is installed below the grid 62, which can converge the water droplets into a water flow and flow into the bottom of the housing 1 along the extending direction of the water absorption brush 63, reducing the water flow vibration at the bottom of the housing 1 and the noise of the water droplets falling, and improving the safety of the housing 1. At the same time, through the scouring action of the water flow converged on the water absorption brush 63, the PVC particles are washed into the bottom of the housing 1, which also prevents to a certain extent the upward countercurrent caused by the evaporation of the water vapor at the bottom of the housing 1. The annular substrate 61 is provided with diversion holes 611, and the diversion holes 611 collect the water droplets falling from above by means of the Coriolis force and discharge them through the water outlet. The discharge process also helps to wash the PVC particles adhered to the inner wall of the housing 1.

[0040] Specifically, the diversion holes 611 are opened along the tangent direction of the spiral. The opening design in the spiral tangent direction enables the medium to have a certain tangential velocity when being discharged, and the medium can flow out more smoothly along the direction of the diversion holes 611, avoiding the situation of blockage or retention of the medium during the discharge process, and ensuring the stability and reliability of the drainage system.

[0041] In the embodiment of this application, the top wall of the annular substrate 61 is a first inclined surface that slopes from its outer side wall towards the grid 62.

[0042] It should be noted that the first inclined surface slopes from the outer side wall of the annular substrate 61 towards the grid 62 to form a diversion slope surface, so that the water flow converges towards the grid 62 area along the inclined surface under the action of gravity, avoiding the retention of liquid droplets on the surface of the annular substrate 61, reducing the adhesion and accumulation of PVC particles on the top of the annular substrate 61, and reducing the risk of blockage.

[0043] In the embodiment of the present application, the Tesla valve channel 21 includes a plurality of passage units 211 arranged alternately. Each passage unit 211 includes a main channel 2111, a first branch channel 2112, and a second branch channel 2113. The top end of the main channel 2111 bifurcates into the first branch channel 2112 and the second branch channel 2113. The first branch channel 2112 is a straight inclined channel, and the second branch channel 2113 is a semi-circular curved channel. The ends of the first branch channel 2112 and the second branch channel 2113 meet at the bottom end of the adjacent main channel 2111.

[0044] It should be noted that in the alternately arranged passage units 211, the first branch channel 2112 provides a low-resistance path, allowing droplets and large particles to quickly settle downward; the second branch channel 2113 forms a high-resistance barrier, forcing the upward airflow to change direction and decelerate, promoting the separation of the gas-liquid two phases, and inhibiting the escape of particles with the airflow.

[0045] In the embodiment of the present application, the tail gas scrubber applicable to water-containing PVC particles further includes a partition plate 8, a water collecting cylinder 9, a diversion assembly 101, a first fixed pulley 10, a plugging assembly 102, a pushing member 103, a stretching member 104, a limiting plate 105, and a plurality of first elastic members 107. The partition plate 8 is detachably arranged on the inner wall of the housing 1. The Tesla multiphase separation plate 2 is made of a lightweight material, with one end rotatably connected to the inner wall of the housing 1 and the other end slidably connected to the partition plate 8. The partition plate 8 is a hollow structure with openings at both ends. The water collecting cylinder 9 is slidably connected inside the hollow structure, and a plugging assembly 102 is arranged at its bottom. Both ends of the plurality of first elastic members 107 are respectively connected to the bottom of the water collecting cylinder 9 and the inner bottom wall of the partition plate 8. The diversion assembly 101 is arranged on the top wall of the water atomization device 3 and is respectively oriented towards the inner wall of the housing 1. The pushing member 103 is arranged on the side of the diversion assembly 101 away from the water atomization device 3 and extends into the hollow structure, and is used to push open the plugging assembly 102 when the water collecting cylinder 9 descends, so that the medium in the water collecting cylinder 9 flows towards the diversion assembly 101 to wash the PVC particles on the inner wall of the housing 1. The first fixed pulley 10 is arranged on the side of the partition plate 8 away from the diversion assembly 101. One end of the stretching member 104 is connected to the top of the water collecting cylinder 9, and the other end is wound around the first fixed pulley 10 and then connected to the top of the Tesla multiphase separation plate 2. The limiting plate 105 is arranged on the side of the partition plate 8 away from the inner wall of the housing 1 and is located below the partition plate 8. When the Tesla multiphase separation plate 2 is horizontally placed, its bottom abuts against the top of the limiting plate 105. At this time, the stretching member 104 between the first fixed pulley 10 and the Tesla multiphase separation plate 2 is in a relaxed state, and the Tesla multiphase separation plate 2, the partition plate 8, and the water collecting cylinder 9 form a sealed structure.

[0046] The stretching member 104 of the present application is a steel wire rope.

[0047] It should be noted that as Figure 1and Figure 2 As shown, the Tesla multiphase separation plate 2 is held horizontal by the limit plate 105, the tension member 104 is in a relaxed state, the water collecting cylinder 9 is supported by the first elastic member 107 and located at a high position, and forms a sealed structure with the Tesla multiphase separation plate 2 and the partition plate 8. When it is detected that the deviation between the air flow velocity at the exhaust port 11 and the flow velocity at the intake port 12 exceeds the set threshold, the console 7 determines that the Tesla valve channel 21 is blocked and promptly notifies the staff. At this time, the console 7 automatically opens the second valve 75 and starts the water spray device 5 for online cleaning. Part of the spray water flow is collected by the water collecting cylinder 9. As the liquid weight inside it increases, the water collecting cylinder 9 gradually moves downward against the elastic force of the first elastic member 107. When the water collecting cylinder 9 descends, the tension member 104 changes from a relaxed state to a taut state through the first fixed pulley 10, pulling the Tesla multiphase separation plate 2 upward to expand the gap of the Tesla valve channel 21 and enhance the water flow penetration force. When the water collecting cylinder 9 moves down to the preset position, the pushing member 103 extends into the hollow structure and pushes open the blocking assembly 102. The liquid stored in the water collecting cylinder 9 is flushed along the inner wall of the housing 1 at high speed through the diversion assembly 101 to remove the residual PVC particles. After the console 7 detects that the air flow velocity has returned to the normal range, it closes the second valve 75 and stops the spraying. After the spraying stops, the liquid in the water collecting cylinder 9 is emptied and rises to the initial high position under the resilience of the first elastic member 107, and the tension member 104 returns to a relaxed state. The Tesla multiphase separation plate 2 loses the pulling force of the tension member 104 and falls back to the top wall of the limit plate 105 under the action of gravity, reforming the horizontal sealed state.

[0048] Specifically, when cleaning the impurities in the Tesla multiphase separation plate 2, the valve at the intake port 12 can be closed to further ensure the system safety and cleaning effect.

[0049] In the embodiment of the present application, the tail gas scrubber applicable to water-containing PVC particles further includes a magnetic attraction assembly 106. The magnetic attraction assembly 106 is arranged between the Tesla multiphase separation plate 2 and the limit plate 105 and is used to adsorb the Tesla multiphase separation plate 2 to the limit plate 105 to prevent the tail gas from blowing the Tesla multiphase separation plate 2.

[0050] It should be noted that when the tail gas flows at a high speed, it is easy to generate an impact force on the Tesla multiphase separation plate 2. The magnetic attraction assembly 106 tightly fixes the separation plate and the limit plate 105 through a strong magnetic attraction force, avoiding the vibration or deviation of the Tesla multiphase separation plate 2 caused by air flow disturbance and ensuring its horizontal working state.

[0051] In the embodiment of the present application, the tail gas scrubbing tower applicable to water-containing PVC particles further includes a second fixed pulley 108 and a third fixed pulley 109. The second fixed pulley 108 and the third fixed pulley 109 are respectively arranged on the side of the partition plate 8 away from the flow guiding assembly 101 and are located on both sides of the first fixed pulley 10. The second fixed pulley 108 faces the water collecting cylinder 9, and the third fixed pulley 109 faces the Tesla multiphase separation plate 2. One end of the stretching member 104 is connected to the top of the water collecting cylinder 9, and the other end is sequentially wound around the second fixed pulley 108, the first fixed pulley 10, and the third fixed pulley 109 and then connected to the top of the Tesla multiphase separation plate 2. The second fixed pulley 108 and the third fixed pulley 109 are respectively used to make the stretching member 104 act vertically on the water collecting cylinder 9 and the Tesla multiphase separation plate 2. The second fixed pulley 108 changes the force direction of the stretching member 104 to make it act vertically on the top of the water collecting cylinder 9, ensuring the stable movement of the water collecting cylinder 9 in the vertical direction.

[0052] The third fixed pulley 109 changes the force direction of the stretching member 104 to make it act vertically on the top of the Tesla multiphase separation plate 2.

[0053] The projection of the third fixed pulley 109 on the horizontal plane partially coincides with the projection of the Tesla multiphase separation plate 2 to limit the moving height of the Tesla multiphase separation plate 2.

[0054] In the embodiment of the present application, the plugging assembly 102 includes a plug 1021, a limiting member 1022, and a second elastic member 1023. A water leakage port is provided at the bottom of the water collecting cylinder 9, and the plug 1021 is inserted into the water leakage port. The limiting member 1022 is fixedly connected to the top wall of the plug 1021. Two ends of the second elastic member 1023 are respectively connected to the limiting member 1022 and the inner side of the water leakage port. The cross-sectional area of the top wall of the pushing member 103 is smaller than the area of the water leakage port, and the top end of the pushing member 103 can pass through the water leakage port and push open the plug 1021.

[0055] In the embodiment of the present application, the flow guiding assembly 101 includes a fixed shaft 1011, a flow guiding member 1012, a funnel 1013, and a plurality of flow guiding vanes 1014. The fixed shaft 1011 is fixedly arranged in the middle of the top wall of the water atomizing device 3. The plurality of flow guiding vanes 1014 are rotatably arranged along the circumferential direction of the fixed shaft 1011 and are inclined towards the inner wall of the housing 1. One end of the flow guiding member 1012 is connected to the top wall of the fixed shaft 1011, and the other end is connected to one end of the funnel 1013. The other end of the funnel 1013 extends into the hollow structure and is provided with a pushing member 103. The funnel 1013 is used to receive the medium in the water collecting cylinder 9 and introduce the medium into the flow guiding vanes 1014 through the flow guiding member 1012.

[0056] It should be noted that the flow guiding vane 1014 can rotate automatically under the drive of the high-speed air flow in the housing 1. When the air flow passes through, it will drive the flow guiding vane 1014 to rotate, and uniformly throw the flowing liquid medium towards the inner wall of the housing 1 by centrifugal force, forming a continuous liquid film coverage. This process can effectively wash the PVC particles on the inner wall of the housing 1 and prevent their accumulation and blockage. The flow guiding assembly 101 of the present application is ingeniously designed, directly using the kinetic energy of the tail gas itself to drive the rotation of the flow guiding vane 1014 without an additional power device. This not only effectively reduces the system energy consumption but also realizes green operation.

[0057] Specifically, the flow guiding assembly 101 further includes a locking mechanism. When the flow guiding vane 1014 does not need to rotate, the locking mechanism can intervene and lock the flow guiding vane 1014 to prevent it from continuing to rotate. The design of the locking mechanism can include but is not limited to a mechanical locking mechanism, an electromagnetic brake, or a hydraulic braking system, etc. The specific selection depends on the application scenario and actual requirements. Through the control of the locking mechanism, the working state of the flow guiding assembly 101 can be flexibly adjusted to meet different process requirements.

[0058] In the embodiment of the present application, the top wall of the partition plate 8 is a second inclined surface that slopes from its outer side wall towards the Tesla multiphase separation plate 2. A plurality of water leakage holes 22 are provided in the edge area of the Tesla multiphase separation plate 2. The water leakage holes 22 are close to the inner wall of the housing 1, and a first one-way valve 23 is provided in the water leakage holes 22. The first one-way valve 23 is configured to only allow the medium to flow from top to bottom. The water leakage holes 22 are used to discharge the liquid droplets accumulated in the Tesla valve channel 21 to the bottom of the housing 1 through the first one-way valve 23.

[0059] It should be noted that the second inclined surface slopes from the outer side wall of the partition plate 8 towards the Tesla multiphase separation plate 2, forming a liquid droplet flow guiding slope surface, and guiding the liquid droplets on the second inclined surface towards the Tesla multiphase separation plate 2 to avoid the retention of liquid droplets at the top of the partition plate 8. Specifically, a plurality of through holes are provided on the right side of the partition plate 8, and a second one-way valve is provided in the through holes, and the liquid droplets on the right side of the partition plate 8 can flow out through the through holes.

[0060] When the Tesla multiphase separation plate 2 rotates, it can guide the liquid droplets thereon to the water leakage holes 22 and flow to the bottom of the housing 1 through the water leakage holes 22. The first one-way valve 23 of the present application only allows the fluid to flow unidirectionally downward, preventing the backmixing of liquid droplets caused by the backflow of high-speed air flow.

[0061] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0062] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. An off-gas scrubbing tower applicable to water-containing PVC particles, characterized in that, It includes a housing (1), a Tesla multiphase separation plate (2), a water atomization device (3), a wire mesh demister (4), a water spray device (5) and a control console (7); An exhaust port (11) is provided at the top of the housing (1), an air inlet (12) and a liquid discharge port (13) are provided on the side wall, and a drain port (14) is provided at the bottom; wherein, the liquid discharge port (13) is provided below the air inlet (12); The wire mesh demister (4), the water spray device (5), the Tesla multiphase separation plate (2) and the water atomization device (3) are sequentially arranged from top to bottom along the height direction of the inner cavity of the housing (1). Among them, the Tesla multiphase separation plate (2) is provided with a plurality of Tesla valve channels (21), and the Tesla valve channels (21) have a small resistance coefficient when the medium flows downward and a large resistance coefficient when flowing upward; wherein, the water atomization device (3) is provided above the air inlet (12); A raw material gas particle monitoring instrument (71) is provided between the air inlet (12) and the control console (7); An exhaust gas outlet particle monitoring instrument (72) and a flow velocity monitoring instrument (73) are provided between the exhaust port (11) and the control console (7); The water atomization device (3) is connected to the control console (7) through a first valve (74), and the water spray device (5) is connected to the control console (7) through a second valve (75); The control console (7) is configured to: dynamically adjust the opening degree of the first valve (74) according to the particle concentration and particle size distribution data of the air inlet (12) fed back by the raw material gas particle monitoring instrument (71) to control the atomized droplet flux; obtain the particle concentration and air flow velocity data of the exhaust port (11) in real time through the exhaust gas outlet particle monitoring instrument (72) and the flow velocity monitoring instrument (73). When the deviation between the air flow velocity of the exhaust port (11) and the flow velocity of the air inlet (12) is detected to exceed the set threshold, the second valve (75) is opened to start the water spray device (5) to remove the accumulated particle impurities in the Tesla valve channels (21); It further includes a partition plate (8), a water collecting cylinder (9), a diversion assembly (101), a first fixed pulley (10), a plugging assembly (102), a pushing member (103), a stretching member (104), a limiting plate (105) and a plurality of first elastic members (107); The Tesla multiphase separation plate (2) is rotatably connected to the inner wall of the housing (1); The partition plate (8) is detachably arranged on the inner wall of the housing (1), and one end of the Tesla multiphase separation plate (2) away from the housing (1) is slidably connected to one end of the partition plate (8) away from the inner wall of the housing (1); The partition plate (8) is a hollow structure with openings at both ends; The water collecting cylinder (9) is slidably connected inside the hollow structure, and a plugging assembly (102) is provided at its bottom; Both ends of the plurality of first elastic members (107) are respectively connected to the bottom of the water collecting cylinder (9) and the inner bottom wall of the partition plate (8); The diversion assembly (101) is arranged on the top wall of the water atomization device (3) and is respectively arranged towards the inner wall of the housing (1). The pushing member (103) is arranged on the side of the diversion assembly (101) away from the water atomization device (3) and extends into the hollow structure. When the water collection cylinder (9) descends, it is used to push open the blocking assembly (102) so that the medium in the water collection cylinder (9) flows towards the diversion assembly (101) to wash the PVC particles on the inner wall of the housing (1); The first fixed pulley (10) is arranged on the side of the partition plate (8) away from the diversion assembly (101); One end of the stretching member (104) is connected to the top of the water collection cylinder (9), and the other end is wound around the first fixed pulley (10) and then connected to the top of the Tesla multiphase separation plate (2); The limiting plate (105) is arranged on the side of the partition plate (8) away from the inner wall of the housing (1) and is located below the partition plate (8); When the Tesla multiphase separation plate (2) is horizontally placed, its bottom abuts against the top of the limiting plate (105). At this time, the stretching member (104) between the first fixed pulley (10) and the Tesla multiphase separation plate (2) is in a relaxed state, and the Tesla multiphase separation plate (2), the partition plate (8) and the water collection cylinder (9) form a sealed structure.

2. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 1, characterized in that, It further includes a brush water absorption plate device (6) arranged in the inner cavity of the housing (1), and the brush water absorption plate device (6) is located between the air inlet (12) and the liquid discharge port (13); The brush water absorption plate device (6) includes an annular base plate (61), a grille (62) and a plurality of water absorption brushes (63); The annular base plate (61) is detachably connected to the inner wall of the housing (1) and is a cavity structure with openings at both ends. The grille (62) is arranged in the cavity structure, and a plurality of the water absorption brushes (63) are arranged at the bottom of the grille (62); The annular base plate (61) is provided with a plurality of diversion holes (611), and the diversion holes (611) extend along a spiral direction for guiding the medium and scraping the PVC particles adhered to the inner wall of the housing (1).

3. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 2, characterized in that, The top wall of the annular base plate (61) is a first inclined surface that slopes from its outer side wall towards the grille (62).

4. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 1, characterized in that, The Tesla valve channel (21) includes a plurality of alternately arranged passage units (211). Each passage unit (211) includes a main channel (2111), a first branch channel (2112) and a second branch channel (2113). The top end of the main channel (2111) bifurcates into the first branch channel (2112) and the second branch channel (2113). The first branch channel (2112) is a straight inclined channel, and the second branch channel (2113) is a semi-circular curved channel. The ends of the first branch channel (2112) and the second branch channel (2113) meet at the bottom end of the adjacent main channel (2111).

5. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 1, characterized in that, It further includes a magnetic attraction assembly (106); The magnetic adsorption assembly (106) is disposed between the Tesla multiphase separation plate (2) and the limiting plate (105) for adsorbing the Tesla multiphase separation plate (2) to the limiting plate (105) to prevent the exhaust gas from blowing the Tesla multiphase separation plate (2).

6. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 1, characterized in that, It further includes a second fixed pulley (108) and a third fixed pulley (109); The second fixed pulley (108) and the third fixed pulley (109) are respectively disposed on one side of the partition plate (8) away from the flow guiding assembly (101) and on both sides of the first fixed pulley (10). The second fixed pulley (108) is arranged facing the water collecting cylinder (9), and the third fixed pulley (109) is arranged facing the Tesla multiphase separation plate (2); One end of the stretching member (104) is connected to the top of the water collecting cylinder (9), and the other end thereof is sequentially wound around the second fixed pulley (108), the first fixed pulley (10) and the third fixed pulley (109) and then connected to the top of the Tesla multiphase separation plate (2); The second fixed pulley (108) and the third fixed pulley (109) are respectively used to make the stretching member (104) act vertically on the water collecting cylinder (9) and the Tesla multiphase separation plate (2); The projection of the third fixed pulley (109) on the horizontal plane partially coincides with the projection of the Tesla multiphase separation plate (2) to limit the moving height of the Tesla multiphase separation plate (2).

7. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 1, characterized in that, The plugging assembly (102) includes a plug (1021), a limiting member (1022) and a second elastic member (1023); A water leakage port is provided at the bottom of the water collecting cylinder (9), and the plug (1021) is inserted into the water leakage port; The limiting member (1022) is fixedly connected to the top wall of the plug (1021); Both ends of the second elastic member (1023) are respectively connected to the limiting member (1022) and the inner side of the water leakage port; The cross-sectional area of the top wall of the pushing member (103) is smaller than the area of the water leakage port, and the top end of the pushing member (103) can pass through the water leakage port and push open the plug (1021).

8. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 1, characterized in that, The flow guiding assembly (101) includes a fixed shaft (1011), a flow guiding member (1012), a funnel (1013), and a plurality of flow guiding vanes (1014); The fixed shaft (1011) is fixedly arranged in the middle of the top wall of the water atomizing device (3), and a plurality of the flow guiding vanes (1014) are rotatably arranged along the circumference of the fixed shaft (1011) and are inclined towards the inner wall of the housing (1); One end of the flow guiding member (1012) is connected to the top wall of the fixed shaft (1011), and the other end is connected to one end of the funnel (1013); The other end of the funnel (1013) extends into the hollow structure and is provided with the pushing member (103); The funnel (1013) is used to receive the medium in the water collecting cylinder (9) and introduce the medium into the flow guiding vanes (1014) through the flow guiding member (1012).

9. The tail gas scrubbing tower applicable to water-containing PVC particles according to claim 1, wherein The top wall of the partition plate (8) is a second inclined plane that slopes from its outer side wall towards the Tesla multiphase separation plate (2); A plurality of water leakage holes (22) are provided in the edge region of the Tesla multiphase separation plate (2). The water leakage holes (22) are close to the inner wall of the housing (1). A first one-way valve (23) is provided in the water leakage holes (22), and the first one-way valve (23) is configured to only allow the medium to flow from top to bottom; The water leakage holes (22) are used to drain the liquid droplets accumulated in the Tesla valve channel (21) to the bottom of the housing (1) through the first one-way valve (23).

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