Air pressure adjusting type polyvinyl chloride drying and conveying system
By setting up an air pressure balance mechanism in the vibration separation device of the polyvinyl chloride drying conveying system, the problems of material blockage and material discharge caused by the reflux of the air flow of the conveying fan are solved, and the air pressure balance inside and outside the system is achieved, ensuring smooth resin cutting, improving production efficiency and reducing environmental pollution.
Patent Information
- Application Number
- CN202421728159.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In the existing polyvinyl chloride drying conveying system, the airflow of the conveying fan flew back to the buffer hopper, resulting in blockage and material disconnection problems, affecting the stable operation of the system, causing material waste and environmental pollution.
An air pressure balance mechanism is installed in the vibration separation device, and the air pressure balance inside and outside the system is adjusted through jacketed short sections and air pressure balance pipes to prevent airflow from refluxing and ensure smooth resin discharge.
It effectively prevents poor resin cutting and accumulation of material from vibrating screens due to increased air pressure, avoids waste of materials, improves production efficiency, and reduces environmental pollution.
Smart Images
Figure CN222989234U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of polyvinyl chloride drying and conveying, and in particular relates to a pneumatic pressure regulating polyvinyl chloride drying and conveying system. Background Art
[0002] In the current production process of polyvinyl chloride, the polyvinyl chloride resin generated by polymerization in the polymerization kettle is subjected to steam stripping to remove residual vinyl chloride, then enters the drying process to remove moisture, and after a series of treatments, is transported to a storage bin for storage.
[0003] However, in the process of resin conveying in the existing equipment, part of the gas from the conveying fan that provides power will enter the buffer hopper and the vibrating screen through the gap between the impeller and the end cover of the conveying feeder. When the pressure of the incoming gas is too high, it will cause the resin in the buffer hopper and the vibrating screen to be discharged poorly, resulting in accumulation and material leakage, affecting the stable operation of the system, causing material waste and environmental pollution.
[0004] Therefore, it is urgent to optimize and transform the existing drying and conveying system structure to overcome the problems of blockage and material leakage caused by air flow backflow. Utility Model Content
[0005] The utility model aims to provide an air pressure regulating polyvinyl chloride drying and conveying system, which solves the problems of material blocking and material leakage caused by the airflow of the conveying fan returning to the buffer hopper in the existing conveying system.
[0006] The technical scheme adopted by the utility model is an air pressure regulating polyvinyl chloride drying and conveying system, comprising a centrifuge, a centrifuge discharge port is connected to a dryer, the dryer is connected to a first separation device, a discharge end of the first separation device is refluxed and connected to the dryer, the first separation device is also connected to an exhaust gas washing tower, the dryer is connected to a primary conveying pipeline through a drying feeder arranged on the side, the primary conveying pipeline is connected to a second separation device, a discharge end of the second separation device is connected to a vibration separation device, the second separation device is also connected to an exhaust gas washing tower, a discharge end of the vibration separation device is connected to a secondary conveying pipeline, the secondary conveying pipeline is respectively connected to a conveying fan and a silo, and an air pressure balancing mechanism is arranged in the vibration separation device.
[0007] The utility model is also characterized in that:
[0008] The first separation device comprises a first cyclone separator, a solid material outlet of the first cyclone separator is connected to a first feeder, a first feeder outlet reflux is connected to a dryer, and a gas outlet of the first cyclone separator is connected to an exhaust gas washing tower through a first induced draft fan.
[0009] The second separation device comprises a second cyclone separator, the solid material outlet of the second cyclone separator is connected to the second feeder, the outlet of the second feeder is connected to the vibration separation device, and the gas outlet of the second cyclone separator is connected to the exhaust gas washing tower through the second induced draft fan.
[0010] The vibration separation device includes a vibrating screen. The outlet of the vibrating screen is connected to a buffer hopper. The outlet of the buffer hopper is connected to a conveying and feeding device through a feeding pipeline, and the outlet of the conveying and feeding device is connected to a secondary conveying pipeline.
[0011] The specific structure of the air pressure balance mechanism is that a jacketed short section is arranged on the feeding pipeline. The outer sandwich of the jacketed short section is communicated with the top of the buffer hopper through an air pressure balance pipeline, and an air pressure valve is arranged on the air pressure balance pipeline close to the buffer hopper side.
[0012] The buffer hopper is also provided with an exhaust pipeline, which is communicated with the primary conveying pipeline, and an exhaust valve is arranged on the exhaust pipeline.
[0013] The feeding end of the centrifuge is connected to the centrifugal tank through a slurry pump.
[0014] The dryer is also provided with an air inlet pipeline, and a blower, an air filter, and an air heater are sequentially arranged on the air inlet pipeline.
[0015] The beneficial effects of the present utility model are as follows: The pressure-adjustable polyvinyl chloride drying and conveying system provided by the present utility model is provided with an air pressure balance mechanism in the vibration separation device. When the air flow of the conveying fan returns through the gap between the impeller and the end cover of the conveying and feeding device during the drying and conveying process of polyvinyl chloride resin, the air pressure balance inside and outside the system can be maintained under the adjustment of the air pressure balance mechanism, preventing the resin from being blocked during feeding and the phenomenon of material running and piling up on the vibrating screen caused by the increase of the internal air pressure of the system, avoiding waste, improving production efficiency and reducing environmental pollution; when the air pressure further increases, the return gas can be pumped out through the arranged exhaust pipeline to maintain the stable operation of the system and ensure the safety of the system and production personnel. Description of the Drawings
[0016] Figure 1 It is a schematic structural diagram of the air pressure-adjustable polyvinyl chloride drying and conveying system of the present utility model.
[0017] In the figure: 1. Centrifugal tank; 2. Slurry pump; 3. Centrifuge; 4. Dryer; 5. Blower; 6. Air filter; 7. Air heater; 8. First induced draft fan; 9. Waste gas scrubbing tower; 10. First cyclone separator; 11. First feeder; 12. Dry feeding device; 13. Second induced draft fan; 14. Second cyclone separator; 15. Second feeder; 16. Vibrating screen; 17. Buffer hopper; 18. Conveying and feeding device; 19. Conveying fan; 20. Storage bin; 21. Jacketed short section; 22. Air pressure valve; 23. Feeding pipeline; 24. Primary conveying pipeline; 25. Secondary conveying pipeline; 26. Air pressure balance pipeline; 27. Exhaust pipeline. Detailed Embodiments
[0018] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0019] The air pressure adjustable polyvinyl chloride drying and conveying system provided by the present utility model, as Figure 1 shown, includes a centrifuge 3. A centrifugal tank 1 can be arranged at the feeding end of the centrifuge 3. After the polyvinyl chloride slurry generated by the polymerization kettle reaction is stripped of vinyl chloride by a stripping tower, it is transported to the drying centrifugal tank 1. The slurry is stored in the centrifugal tank 1 and transported to the centrifuge 3 through a slurry pump 2. The discharge port of the centrifuge 3 is connected to a dryer 4. The dryer 4 is also provided with an air inlet pipe, and a blower 5, an air filter 6, and an air heater 7 are successively arranged on the air inlet pipe. After the slurry is centrifugally dehydrated, it enters the dryer 4. The air sent by the blower 5 passes through the air filter 6 and then enters the dryer 4 after being heated by the air heater 7. The hot air entering the dryer 4 contacts the wet material in the dryer 4, blows the material in the dryer 4 to a boiling state, and through sufficient and uniform heat transfer by mixing with the hot air, the wet material is preliminarily dried. The dryer 4 is connected to a first separation device, and the discharge end of the first separation device is reflux-connected to the dryer 4. The first separation device is also connected to an exhaust gas scrubbing tower 9. After the slurry is preliminarily dried in the dryer 4, the dust-containing gas enters the first separation device for preliminary solid-gas separation. The separated wet air is purified by the exhaust gas scrubbing tower 9 and then discharged into the atmosphere. The separated solid resin is refluxed to the dryer 4 again for re-drying. The dryer 4 is connected to a primary conveying pipeline 24 through a drying discharge device 12 arranged on the side. The primary conveying pipeline 24 is connected to a second separation device. The dried resin enters the primary conveying pipeline 24 through the drying discharge device 12 arranged on the side of the dryer 4 and is transported to the second separation device. The discharge end of the second separation device is connected to a vibration separation device. The second separation device is also connected to the exhaust gas scrubbing tower 9. The second separation device further separates the dust-containing gas and the resin in the material. The separated dust-containing gas is purified and discharged by the exhaust gas scrubbing tower 9. The resin is fed to the vibration separation device. The discharge end of the vibration separation device is connected to a secondary conveying pipeline 25. The secondary conveying pipeline 25 is respectively connected to a conveying fan 19 and a silo 20. An air pressure balancing mechanism is arranged in the vibration separation device. During the vibration separation process, the air pressure in the vibration separation device can be adjusted through the air pressure balancing mechanism to ensure the internal air pressure balance and prevent the situation of unsmooth feeding, resin accumulation, and material running in the device. After the resin is vibration-separated, under the action of the conveying fan 19, it is transported to the silo 20 through the secondary conveying pipeline 25.
[0020] Among them, the first separation device specifically includes a first cyclone separator 10. The feed inlet of the first cyclone separator 10 is connected to the dryer 4. The solid material outlet of the first cyclone separator 10 is connected to a first feeder 11. The outlet of the first feeder 11 is connected back to the dryer 4 in a reflux manner. The gas outlet of the first cyclone separator 10 is connected to an exhaust gas scrubber 9 through a first induced draft fan 8. The dust-containing gas preliminarily dried in the dryer 4 enters the first cyclone separator 10 under the action of the first induced draft fan 8. The separated solid material is refluxed to the dryer 4 through the first feeder 11, and the wet air is purified and discharged through the exhaust gas scrubber 9.
[0021] Among them, the second separation device includes a second cyclone separator 14. The feed inlet of the second cyclone separator 14 is communicated with a primary conveying pipeline 24. The solid material outlet of the second cyclone separator 14 is connected to a second feeder 15. The outlet of the second feeder 15 is connected to a vibration separation device. The gas outlet of the second cyclone separator 14 is connected to the exhaust gas scrubber 9 through a second induced draft fan 13. The material conveyed by the primary conveying pipeline 24 enters the second cyclone separator 14 under the action of the second induced draft fan 13 for further solid-gas separation. The separated exhaust gas is discharged by the exhaust gas scrubber 9, and the solid material is sent to the vibration separation device through the second feeder 15.
[0022] Among them, the vibration separation device includes a vibrating screen 16. The outlet of the vibrating screen 16 is connected to a buffer hopper 17. The outlet of the buffer hopper 17 is connected to a conveying feeder 18 through a feeding pipeline 23. The outlet of the conveying feeder 18 is connected to a secondary conveying pipeline 25. The vibrating screen 16 receives the resin material conveyed by the second feeder 15. After vibration separation, it enters the buffer hopper 17, and then enters the secondary conveying pipeline 25 through the feeding pipeline 23 of the buffer hopper via the conveying feeder 18, and finally is conveyed to a storage bin 20 for storage.
[0023] Based on the above structure, this solution provides a specific structure of a pneumatic balance mechanism to adjust the air pressure inside the vibration separation device. A jacketed short section 21 is provided on the feeding pipe 23 above the feeding conveyor 18. The jacketed short section 21 is a stainless-steel conical short pipe with a sandwich layer. Its lower part is welded with a flange and connected to the flange at the upper end of the feeding conveyor 18. The upper end of the jacketed short section 21 is connected to the inner pipeline of the feeding pipe 23 through a flexible connection. The top of the buffer hopper 17 is open. The outer sandwich layer of the jacketed short section 21 is connected to the top of the buffer hopper 17 through a pneumatic balance pipe 26. A pneumatic valve 22 is provided on the side of the pneumatic balance pipe 26 close to the buffer hopper 17. It can be understood that when setting, two flange-type short pipes can be provided at the opening of the buffer hopper 17, and a stainless-steel ball valve is configured and installed between the two short pipes as the pneumatic valve 22. The flange and the ball valve adopt matching specifications. An opening is made on the outer side wall of the jacketed short section 21 and a pipeline is configured. The outer sandwich layer of the jacketed short section 21 is welded and connected to the flange pipeline with a blind end on the outer side of the pneumatic valve 22 through the pipeline. All flanges used in the pipeline are necked butt welding convex flanges, and the valve flange is a concave flange. In addition, the buffer hopper 17 is also provided with an exhaust pipe 27 connected to the primary conveying pipe 24. An exhaust valve is provided on the exhaust pipe 27. When the air pressure inside the system is too high, the exhaust valve can be opened, and the gas is pumped out under the action of the second induced draft fan 13.
[0024] The operating principle of the system provided by the present utility model during operation is as follows: The polyvinyl chloride resin polymerized in the polymerization kettle reaches the buffer hopper 17 through multiple drying and separation transmissions, enters the secondary conveying pipe 25 through the feeding conveyor 18, and is conveyed to the storage bin 20 for storage under the action of the conveying fan 19. When adjusting the pneumatic balance, the pneumatic valve 22 above the buffer hopper 17 is opened. When a part of the gas of the conveying fan 19 backflows through the gap between the rotor impeller and the end cover of the feeding conveyor 18, the gas enters the sandwich layer of the conical jacketed short section 21, and enters the buffer hopper 17 through the pneumatic balance pipe 26. The opening degree of the pneumatic valve 22 can be adjusted according to the magnitude of the backflow air, achieving the effect of pneumatic balance, so that the material can normally pass through the inner pipeline of the jacketed short section 21 for feeding. When the air pressure inside the system is too high, the exhaust valve on the exhaust pipe 27 is opened, and the excess gas is pumped out through the second induced draft fan 13.
[0025] Example 1
[0026] The air pressure adjustable polyvinyl chloride drying and conveying system provided by Embodiment 1 includes a centrifuge 3. The discharge port of the centrifuge 3 is connected to a dryer 4. The dryer 4 is connected to a first separation device. The discharge end of the first separation device is reflux-connected to the dryer 4. The first separation device is also connected to an exhaust gas scrubbing tower 9. The dryer 4 is connected to a primary conveying pipeline 24 through a drying feeder 12 provided on the side. The primary conveying pipeline 24 is connected to a second separation device. The discharge end of the second separation device is connected to a vibration separation device. The second separation device is also connected to the exhaust gas scrubbing tower 9. The discharge end of the vibration separation device is connected to a secondary conveying pipeline 25. The secondary conveying pipeline 25 is respectively connected to a conveying fan 19 and a storage bin 20. An air pressure balance mechanism is provided in the vibration separation device.
[0027] Embodiment 2
[0028] The air pressure adjustable polyvinyl chloride drying and conveying system provided by Embodiment 2 includes a centrifuge 3. The discharge port of the centrifuge 3 is connected to a dryer 4. The dryer 4 is connected to a first separation device. The first separation device includes a first cyclone separator 10. The solid material outlet of the first cyclone separator 10 is connected to a first feeder 11. The outlet of the first feeder 11 is reflux-connected to the dryer 4. The gas outlet of the first cyclone separator 10 is connected to the exhaust gas scrubbing tower 9 through a first induced draft fan 8. The dryer 4 is connected to a primary conveying pipeline 24 through a drying feeder 12 provided on the side. The primary conveying pipeline 24 is connected to a second separation device. The second separation device includes a second cyclone separator 14. The solid material outlet of the second cyclone separator 14 is connected to a second feeder 15. The outlet of the second feeder 15 is connected to a vibration separation device. The gas outlet of the second cyclone separator 14 is connected to the exhaust gas scrubbing tower 9 through a second induced draft fan 13. The vibration separation device includes a vibrating screen 16. The outlet of the vibrating screen 16 is connected to a buffer hopper 17. The outlet of the buffer hopper 17 is connected to a conveying feeder 18 through a feeding pipeline 23. The outlet of the conveying feeder 18 is connected to a secondary conveying pipeline 25. The secondary conveying pipeline 25 is respectively connected to a conveying fan 19 and a storage bin 20. An air pressure balance mechanism is provided in the vibration separation device.
[0029] The specific structure of the air pressure balance mechanism is that a jacketed short section 21 is provided on the feeding pipeline 23. The outer sandwich of the jacketed short section 21 is communicated with the top of the buffer hopper 17 through an air pressure balance pipeline 26. An air pressure valve 22 is provided on the air pressure balance pipeline 26 close to the buffer hopper 17 side. The buffer hopper 17 is also provided with an exhaust pipeline 27. The exhaust pipeline 27 is communicated with the primary conveying pipeline 24. An exhaust valve is provided on the exhaust pipeline 27.
[0030] Embodiment 3
[0031] The air pressure regulating type polyvinyl chloride drying and conveying system provided by Embodiment 3 includes a centrifuge 3. The feeding end of the centrifuge 3 is connected to a centrifugal tank 1 through a slurry pump 2. The discharge port of the centrifuge 3 is connected to a dryer 4. The dryer 4 is provided with an air inlet pipe, and a blower 5, an air filter 6, and an air heater 7 are successively arranged on the air inlet pipe. The dryer 4 is connected to a first separation device. The first separation device includes a first cyclone separator 10. The solid material outlet of the first cyclone separator 10 is connected to a first feeder 11. The outlet of the first feeder 11 is reflux-connected to the dryer 4. The gas outlet of the first cyclone separator 10 is connected to an exhaust gas scrubbing tower 9 through a first induced draft fan 8. The dryer 4 is connected to a primary conveying pipeline 24 through a drying feeder 12 arranged on the side. The primary conveying pipeline 24 is connected to a second separation device. The second separation device includes a second cyclone separator 14. The solid material outlet of the second cyclone separator 14 is connected to a second feeder 15. The outlet of the second feeder 15 is connected to a vibration separation device. The gas outlet of the second cyclone separator 14 is connected to the exhaust gas scrubbing tower 9 through a second induced draft fan 13. The vibration separation device includes a vibrating screen 16. The outlet of the vibrating screen 16 is connected to a buffer hopper 17. The outlet of the buffer hopper 17 is connected to a conveying feeder 18 through a feeding pipeline 23. The outlet of the conveying feeder 18 is connected to a secondary conveying pipeline 25. An air pressure balance mechanism is arranged in the vibration separation device.
[0032] The specific structure of the air pressure balance mechanism is that a jacketed short section 21 is arranged on the feeding pipeline 23. The outer sandwich of the jacketed short section 21 is communicated with the top of the buffer hopper 17 through an air pressure balance pipeline 26. An air pressure valve 22 is arranged on the air pressure balance pipeline 26 close to the buffer hopper 17 side. The buffer hopper 17 is further provided with an exhaust pipeline 27. The exhaust pipeline 27 is communicated with the primary conveying pipeline 24. An exhaust valve is arranged on the exhaust pipeline 27.
Claims
1. Air pressure regulating polyvinyl chloride drying and conveying system, characterized in that: The invention comprises a centrifuge (3), wherein the discharge port of the centrifuge (3) is connected to a dryer (4), wherein the dryer (4) is connected to a first separation device, wherein the discharge end of the first separation device is reflux-connected to the dryer (4), wherein the first separation device is also connected to an exhaust gas washing tower (9), wherein the dryer (4) is connected to a primary conveying pipeline (24) via a drying feeder (12) arranged on the side, wherein the primary conveying pipeline (24) is connected to a second separation device, wherein the discharge end of the second separation device is connected to a vibration separation device, wherein the second separation device is also connected to an exhaust gas washing tower (9), wherein the discharge end of the vibration separation device is connected to a secondary conveying pipeline (25), wherein the secondary conveying pipeline (25) is respectively connected to a conveying fan (19) and a silo (20), wherein an air pressure balancing mechanism is arranged in the vibration separation device.
2. The air pressure regulating polyvinyl chloride drying and conveying system according to claim 1, characterized in that: The first separation device comprises a first cyclone separator (10), wherein a solid material outlet of the first cyclone separator (10) is connected to a first feeder (11), an outlet reflux of the first feeder (11) is connected to a dryer (4), and a gas outlet of the first cyclone separator (10) is connected to an exhaust gas washing tower (9) via a first induced draft fan (8).
3. The air pressure regulating polyvinyl chloride drying and conveying system according to claim 2, characterized in that: The second separation device comprises a second cyclone separator (14), the solid material outlet of the second cyclone separator (14) is connected to a second feeder (15), the outlet of the second feeder (15) is connected to a vibration separation device, and the gas outlet of the second cyclone separator (14) is connected to an exhaust gas washing tower (9) via a second induced draft fan (13).
4. The air pressure regulating polyvinyl chloride drying and conveying system according to claim 3, characterized in that: The vibration separation device comprises a vibrating screen (16), the outlet of the vibrating screen (16) is connected to a buffer hopper (17), the outlet of the buffer hopper (17) is connected to a conveying feeder (18) via a feeder pipe (23), and the outlet of the conveying feeder (18) is connected to a secondary conveying pipe (25).
5. The air pressure regulating polyvinyl chloride drying and conveying system according to claim 4, characterized in that: The specific structure of the air pressure balance mechanism is that a jacketed short section (21) is arranged on the feed pipe (23), the outer interlayer of the jacketed short section (21) is connected to the top of the buffer hopper (17) through an air pressure balance pipe (26), and an air pressure valve (22) is arranged on the side of the air pressure balance pipe (26) close to the buffer hopper (17).
6. The air pressure regulating polyvinyl chloride drying and conveying system according to claim 5, characterized in that: The buffer hopper (17) is also provided with an exhaust pipe (27), the exhaust pipe (27) is in communication with the primary conveying pipe (24), and an exhaust valve is provided on the exhaust pipe (27).
7. The air pressure regulating polyvinyl chloride drying and conveying system according to any one of claims 1 to 6, characterized in that: The feed end of the centrifuge (3) is connected to the centrifugal tank (1) via a slurry pump (2).
8. The air pressure regulating polyvinyl chloride drying and conveying system according to any one of claims 1 to 6, characterized in that: The dryer (4) is also provided with an air inlet duct, on which a blower (5), an air filter (6), and an air heater (7) are sequentially provided.