Polyvinyl chloride centrifugal mother liquor water buffer homogenizing device

Abstract

The utility model relates to polyvinyl chloride centrifugal mother liquor water's wastewater treatment technical field, is a kind of polyvinyl chloride centrifugal mother liquor water's buffer homogenizing device, it includes vertical flow settling tank, mother liquor pool, sludge pool, waste gas collection tank, vertical flow settling tank is connected with mother liquor input pipeline, vertical flow settling tank is connected with mother liquor water pool between mother liquor buffer pipeline, mother liquor pool is connected with mother liquor output pipeline, vertical flow settling tank is connected with waste gas output pipeline between waste gas collection tank, vertical flow settling tank is connected with sludge pipeline between sludge pool.The utility model is reasonable in structure and compact, convenient to use, and it improves the wastewater treatment efficiency of polyvinyl chloride centrifugal mother liquor water.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology for polyvinyl chloride (PVC) centrifugal mother liquor, and is a buffer homogenizing device for PVC centrifugal mother liquor. Background Technology

[0002] In the polyvinyl chloride (PVC) production process, vinyl chloride monomer and deionized water in the polymerization reactor undergo a polymerization reaction according to the free radical polymerization mechanism under the action of initiators, dispersants, light, or heat, to produce PVC. The material produced from the polymerization reactor is first centrifuged by a centrifuge before entering the downstream process system to produce the finished PVC product. The centrifuge produces a large amount of mother liquor, which is a chlorinated ether mother liquor containing suspended solids, precipitates, and a large amount of foam.

[0003] Currently, the treatment method for chlorinated ether mother liquor involves first using an equalization tank for buffering and homogenization before proceeding with wastewater treatment. However, the solid waste suspended solids and large amounts of foam in the equalization tank can easily cause blockages or cavitation failures in the subsequent conveying equipment (pumps). In addition, removing sludge from the bottom of the equalization tank is also quite difficult, affecting wastewater treatment efficiency.

[0004] In summary, the problems of excessive suspended solids, excessive foam, and difficulty in removing sludge from solid waste during the homogenization process of PVC centrifugal mother liquor have become urgent technical challenges for enterprises to solve. Summary of the Invention

[0005] This invention provides a buffer homogenization device for polyvinyl chloride centrifugal mother liquor, which overcomes the shortcomings of the prior art and can effectively solve the problems of excessive suspended solids, excessive foam, and difficulty in removing sludge from solid waste in the existing polyvinyl chloride centrifugal mother liquor buffer homogenization process.

[0006] The technical solution of this utility model is achieved through the following measures: a buffer homogenizing device for polyvinyl chloride centrifugal mother liquor, comprising a vertical flow settling tank, a mother liquor pool, a sludge discharge pool, and a waste gas collection tank. The upper inlet of the vertical flow settling tank is fixedly connected to a mother liquor input pipeline, the upper outlet of the vertical flow settling tank is fixedly connected to the top inlet of the mother liquor pool, the lower outlet of the mother liquor pool is fixedly connected to a mother liquor output pipeline, the top outlet of the vertical flow settling tank is fixedly connected to the upper inlet of the waste gas collection tank, and the lower outlet of the vertical flow settling tank is fixedly connected to the top inlet of the sludge discharge pool, and a sludge discharge pipeline is fixedly connected to the top inlet of the sludge discharge pool.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] The aforementioned vertical flow settling tank includes an upper end cap, a cylindrical body, and a base. The bottom of the cylindrical body is vertically fixed to the base, and the upper end cap is fixedly connected to the top of the cylindrical body. A conical hopper, wider at the top and narrower at the bottom, is fitted inside the lower part of the cylindrical body. The bottom end of the conical hopper is fixedly installed at a corresponding position on the upper middle part of the base. A central cylinder is vertically installed in the center of the cylindrical body between the lower part of the upper end cap and the top of the conical hopper. A blind plug is fixedly installed at the top outlet of the central cylinder, and a filter head is installed at the bottom outlet of the central cylinder. A support is fixedly connected between the filter head and the base at the bottom of the conical hopper. The device has an exhaust port on the upper end cap, and symmetrical liquid inlets on the upper part of the cylinder. The liquid inlets on the left and right sides of the cylinder are fixedly connected to the central cylinder by liquid inlet pipes. An overflow device is installed at the highest liquid level in the cylinder. An outlet is installed on the cylinder between the bottom of the overflow device and the liquid inlet. A downflow pipe is fixedly connected between the overflow device and the outlet. A first mud discharge port is opened on the bottom of the hopper wall of the conical hopper, and a second mud discharge port is opened on the bottom of the cylinder wall. A mud discharge pipe is fixedly connected between the first mud discharge port and the second mud discharge port.

[0009] The filter head includes a reducer and a filter plate. The bottom outlet of the central cylinder is fixedly connected to the small end of the reducer. The filter plate is installed inside the reducer. The filter plate has several through-holes. A support device is fixedly installed between the filter plate and the base.

[0010] The aforementioned support device includes a first support pipe and a second support pipe. The first support pipe is provided between the lower part of the outlet of the large and small end pipe fitting and the center of the base at the bottom of the conical hopper. The bottom end of the first support pipe is fixed to the base, and a conical blind plug is fixedly installed at the top end of the first support pipe. The second support pipe is fixedly connected between the bottom surface of the filter plate and the conical blind plug.

[0011] The overflow device includes an annular drainage groove and a support frame. An annular drainage groove with an upward-facing opening is embedded in the inner side of the cylinder wall at the liquid inlet at the top of the liquid pipe. Several support frames are symmetrically arranged at intervals along the circumference of the cylinder between the annular drainage groove and the cylinder. The liquid pipe is fixedly connected between the bottom of the annular drainage groove and the liquid outlet of the cylinder.

[0012] The height of the inner wall of the aforementioned annular drainage trough is lower than the height of the outer wall. Several trapezoidal weir teeth are continuously arranged along the circumference at the top of the inner wall of the annular drainage trough, and a V-shaped overflow port is formed between each adjacent trapezoidal weir tooth.

[0013] The above-mentioned vertical flow settling tank has a mother liquor input pipeline fixedly connected to the upper left inlet. A diversion pipeline is fixedly connected between the mother liquor input pipeline and the upper right inlet of the vertical flow settling tank. A mother liquor buffer pipeline is fixedly connected between the upper outlet of the vertical flow settling tank and the top inlet of the mother liquor pool. An exhaust gas output pipeline is fixedly connected between the top exhaust port of the vertical flow settling tank and the upper inlet of the exhaust gas collection tank. A sludge discharge pipeline is fixedly connected between the lower second sludge discharge port of the vertical flow settling tank and the top inlet of the sludge discharge pool.

[0014] A first delivery pump and a first control valve are fixedly installed sequentially along the medium flow direction on the mother liquor input pipeline between the inlet of the mother liquor input pipeline and the diversion pipeline. A second control valve is fixedly installed on the sludge discharge pipeline, and a second delivery pump is fixedly installed on the mother liquor output pipeline.

[0015] Manholes are provided at the lower part of the hopper wall of the conical hopper and at the lower part of the cylinder of the vertical flow settling tank. The manholes are sealed and fixed by manhole flange covers.

[0016] A level gauge and a temperature gauge are fixedly installed on the upper part of the conical hopper.

[0017] This utility model has a reasonable and compact structure and is easy to use. It can effectively defoam, intercept suspended solids, and remove sludge from the mother liquor of polyvinyl chloride centrifugation before storing it in the mother liquor tank for subsequent wastewater treatment, thereby improving wastewater treatment efficiency. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.

[0019] Appendix Figure 2 This is a schematic diagram of the main structure of the vertical flow settling tank of this utility model.

[0020] Appendix Figure 3 This is a top view of the filter plate structure of this utility model.

[0021] Appendix Figure 4 This is a schematic diagram of the main structure of the annular drainage channel of this utility model.

[0022] Appendix Figure 5 This is a top view of the annular drainage channel of this utility model.

[0023] Appendix Figure 6 This is a schematic diagram of the cross-sectional structure of the annular drainage channel of this utility model.

[0024] The codes in the attached diagram are as follows: 1 is the vertical flow settling tank, 2 is the mother liquor tank, 3 is the sludge discharge tank, 4 is the waste gas collection tank, 5 is the mother liquor input pipeline, 6 is the mother liquor buffer pipeline, 7 is the mother liquor output pipeline, 8 is the waste gas output pipeline, 9 is the sludge discharge pipeline, 10 is the upper end cap, 11 is the cylinder body, 12 is the base, 13 is the conical hopper, 14 is the central cylinder, 15 is the blind plug, 16 is the exhaust port, 17 is the liquid inlet, 18 is the liquid inlet pipe, 19 is the liquid outlet, 20 is the lower liquid pipe, 21 is the first sludge discharge port, 2 2 is the second sludge discharge port, 23 is the hopper sludge discharge pipe, 24 is the reducer fitting, 25 is the filter plate, 26 is the filter hole, 27 is the first support pipe, 28 is the second support pipe, 29 is the conical blind plug, 30 is the annular drainage trough, 31 is the support frame, 32 is the weir tooth, 33 is the diversion pipeline, 34 is the first conveying pump, 35 is the first control valve, 36 is the second control valve, 37 is the second conveying pump, 38 is the manhole, 39 is the manhole flange cover, 40 is the level gauge, 41 is the thermometer, and 42 is the overflow port. Detailed Implementation

[0025] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0026] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0027] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 , 2 The layout is described using the methods of numbers 1, 2, 3, 4, 5, and 6. The positional relationships, such as front, back, top, bottom, left, and right, are based on the instructions attached. Figure 1 , 2 The orientation of the layout is determined by the directions of numbers 3, 4, 5, and 6.

[0028] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0029] Example 1: As shown in the attached document Figure 1 As shown, the buffer homogenization device for PVC centrifugal mother liquor includes a vertical flow settling tank 1, a mother liquor pool 2, a sludge discharge pool 3, and a waste gas collection tank 4. The upper inlet of the vertical flow settling tank 1 is fixedly connected to a mother liquor input pipeline 5. The upper outlet of the vertical flow settling tank 1 is fixedly connected to the top inlet of the mother liquor pool 2 via a mother liquor buffer pipeline 6. The lower outlet of the mother liquor pool 2 is fixedly connected to a mother liquor output pipeline 7. The top outlet of the vertical flow settling tank 1 is fixedly connected to the upper inlet of the waste gas collection tank 4 via a waste gas output pipeline 8. The lower outlet of the vertical flow settling tank 1 is fixedly connected to the top inlet of the sludge discharge pool 3 via a sludge discharge pipeline 9.

[0030] The mother liquor from PVC centrifugation contains suspended solids, solid sediments, and a large amount of foam. After defoaming, interception of suspended solids, and sludge removal by this invention, it is stored in the mother liquor tank for subsequent wastewater treatment, thereby improving wastewater treatment efficiency.

[0031] The buffer homogenizing device for the mother liquor of polyvinyl chloride centrifugation can be further optimized and / or improved according to actual needs:

[0032] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 2 As shown, the vertical flow settling tank 1 includes an upper end cap 10, a cylindrical body 11, and a base 12. The bottom of the cylindrical body 11 is vertically fixed to the base 12, and the upper end cap 10 is fixedly connected to the top of the cylindrical body 11. A conical hopper 13, which is wider at the top and narrower at the bottom, is fitted inside the lower part of the cylindrical body 11. The bottom end of the conical hopper 13 is fixedly installed at a corresponding position on the upper middle part of the base 12. A central cylinder 14 is vertically arranged in the center of the cylindrical body 11 between the lower part of the upper end cap 10 and the top of the conical hopper 13. A blind plug 15 is fixedly installed at the top outlet of the central cylinder 14, and a filter head is provided at the bottom outlet of the central cylinder 14. The filter head is fixedly connected to the base 12 at the bottom of the conical hopper 13. The support device has an exhaust port 16 on the upper end cap 10, and liquid inlets 17 symmetrically arranged on the upper part of the cylinder 11. The liquid inlets 17 on the left and right sides of the cylinder 11 are fixedly connected to the central cylinder by liquid inlet pipes 18. An overflow device is provided at the highest liquid level inside the cylinder 11. An outlet 19 is provided on the cylinder 11 between the bottom of the overflow device and the liquid inlet 17. A lower liquid pipe 20 is fixedly connected between the overflow device and the outlet 19. A first mud discharge port 21 is opened on the bottom of the hopper wall of the conical hopper 13, and a second mud discharge port 22 is opened on the bottom of the cylinder wall. A hopper mud discharge pipe 23 is fixedly connected between the first mud discharge port 21 and the second mud discharge port 22.

[0033] As needed, the conical hopper 13 can promote the settling of solid waste in the liquid in the vertical flow settling tank 1, making it easier to discharge the sediment in the vertical flow settling tank 1.

[0034] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 2 , 3 As shown, the filter head includes a reducer fitting 24 and a filter plate 25. The bottom outlet of the central cylinder 14 is fixedly connected to the small end of the reducer fitting 24. The filter plate 25 is provided in the inner cavity of the reducer fitting 24. Several vertically penetrating filter holes 26 are provided on the filter plate 25. A support device is fixedly installed between the filter plate 25 and the base 12.

[0035] As needed, the solution entering the vertical flow settling tank 1 is chlorinated ether mother liquor that has been treated with surfactant. The chlorinated ether mother liquor contains a large number of bubbles. The chlorinated ether mother liquor enters the central cylinder 14 through the inlet pipe 18, and then enters the vertical flow settling tank 1 for solid waste settling after being filtered and defoamed by the filter plate 25.

[0036] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 2 As shown, the support device includes a first support pipe 27 and a second support pipe 28. The first support pipe 27 is provided between the lower part of the bottom outlet of the reducer fitting 24 and the center of the base 12 at the bottom of the conical hopper 13. The bottom end of the first support pipe 27 is fixed to the base 12. A conical blind plug 29 is fixedly installed at the top end of the first support pipe 27. The second support pipe 28 is fixedly connected between the bottom surface of the filter plate 25 and the conical blind plug 29.

[0037] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 2 , 4 As shown in Figures 5 and 6, the overflow device includes an annular drainage groove 30 and a support frame 31. An annular drainage groove 30 with an upward-facing opening is embedded in the inner side of the cylinder 11 at the highest liquid level. Several support frames 31 are symmetrically arranged at intervals along the circumference of the cylinder 11 between the annular drainage groove 30 and the cylinder 11. A downpipe 20 is fixedly connected between the bottom of the annular drainage groove 30 and the liquid outlet 19 of the cylinder 11.

[0038] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 2 , 4 As shown in Figures 5 and 6, the height of the inner wall of the annular drainage trough 30 is lower than the height of the outer wall. Several trapezoidal weir teeth 32 are continuously arranged along the circumference at the top of the inner wall of the annular drainage trough 30, and a V-shaped overflow port 42 is between each adjacent trapezoidal weir tooth 32.

[0039] As required, the solution entering the vertical flow settling tank 1 contains a large amount of solid waste floating matter. The highest liquid level in the vertical flow settling tank 1 shall not be higher than the top of the trapezoidal weir tooth 32. The trapezoidal weir tooth 32 can intercept solid waste floating matter. The clear liquid in the upper part of the vertical flow settling tank 1 overflows into the annular drainage trough 30 through the V-shaped overflow port. The solution in the annular drainage trough 30 flows out of the vertical flow settling tank 1 through the lower liquid pipe 20.

[0040] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 , 2As shown, the mother liquor input pipeline 5 is fixedly connected to the upper left inlet 17 of the vertical flow settling tank 1. A diversion pipeline 33 is fixedly connected between the mother liquor input pipeline 5 and the upper right inlet 17 of the vertical flow settling tank 1. A mother liquor buffer pipeline 6 is fixedly connected between the upper outlet 19 of the vertical flow settling tank 1 and the top inlet of the mother liquor pool 2. A waste gas output pipeline 8 is fixedly connected between the top exhaust port 16 of the vertical flow settling tank 1 and the upper inlet of the waste gas collection tank 4. A sludge discharge pipeline 9 is fixedly connected between the lower second sludge discharge port 22 of the vertical flow settling tank 1 and the top inlet of the sludge discharge pool 3.

[0041] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figure 1 As shown, a first delivery pump 34 and a first control valve 35 are fixedly installed sequentially along the medium flow direction on the mother liquor input pipeline 5 between the inlet of the mother liquor input pipeline 5 and the diversion pipeline 33. A second control valve 36 is fixedly installed on the sludge discharge pipeline 9. A second delivery pump 37 is fixedly installed on the mother liquor output pipeline 7.

[0042] Example 9: It differs from Examples 1 to 8 in that: as shown in the appendix Figure 2 As shown, manholes 38 are provided on the lower part of the hopper wall of the conical hopper 13 and the lower part of the cylinder 11 of the vertical flow settling tank 1. The manholes 38 are sealed and fixed by manhole flange covers 39.

[0043] If any component in the vertical flow settling tank 1 malfunctions due to long-term operation, the liquid in the vertical flow settling tank 1 can be drained, the manhole flange cover 39 can be opened, and maintenance personnel can enter the vertical flow settling tank 1 through the manhole 38 to carry out maintenance and troubleshooting.

[0044] Example 10: It differs from Examples 1 to 9 in that, as shown in the appendix... Figure 2 As shown, a level gauge 40 and a temperature gauge 41 are fixedly installed on the upper part of the cylindrical body 11 of the conical hopper 13.

[0045] Depending on the needs, the pipelines and equipment of the PVC centrifugal mother liquor buffer homogenization device may also be equipped with conventional valves, thermometers and pressure gauges known in the art, as required by production.

[0046] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0047] The usage process of this utility model embodiment is as follows: First, the chlorinated ether mother liquor discharged from the upstream centrifuge device enters the central cylinder 14 sequentially through the mother liquor input pipeline 5 and the liquid inlet pipe 18. The liquid in the central cylinder 14 is filtered and defoamed by the filter plate 25 before entering the vertical flow settling tank 1. The solid waste sediment in the liquid in the vertical flow settling tank 1 settles to the bottom of the conical hopper 13. Then, the sedimented sludge at the bottom of the conical hopper 13 enters the sludge discharge pool 3 for buffering sequentially through the sludge discharge pipe 23 and the sludge discharge pipeline 9. Next, the liquid in the vertical flow settling tank 1... The exhaust gas emitted by the body enters the exhaust gas collection tank 4 through the exhaust gas output pipeline 8 for buffering; finally, when the liquid level in the vertical flow settling tank 1 rises to the overflow port 42, the solid waste floating on the liquid surface is intercepted by the weir teeth 32, and the clear liquid after interception flows into the annular drainage trough 30 through the overflow port 42. The liquid in the annular drainage trough 30 enters the mother liquor pool 2 through the liquid outlet pipe 20 and the mother liquor buffer pipeline 6 for buffering. The chlorinated ether mother liquor water in the mother liquor pool 2 enters the downstream process system for waste liquid treatment through the mother liquor output pipeline 7.

Claims

1. A buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water, characterized in that... It includes a vertical flow settling tank, a mother liquor tank, a sludge discharge tank, and a waste gas collection tank. The upper inlet of the vertical flow settling tank is fixedly connected to a mother liquor input pipeline. The upper outlet of the vertical flow settling tank is fixedly connected to the top inlet of the mother liquor tank, and the lower outlet of the mother liquor tank is fixedly connected to a mother liquor output pipeline. The top outlet of the vertical flow settling tank is fixedly connected to the upper inlet of the waste gas collection tank, and the lower outlet of the vertical flow settling tank is fixedly connected to the top inlet of the sludge discharge tank, and a sludge discharge pipeline is fixedly connected to the top inlet of the sludge discharge tank.

2. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 1, characterized in that... The vertical flow settling tank includes an upper head, a cylindrical body, and a base. The bottom of the cylindrical body is vertically fixed to the base, and the upper head is fixedly connected to the top of the cylindrical body. A conical hopper, wider at the top and narrower at the bottom, is fitted inside the lower part of the cylindrical body. The bottom of the conical hopper is fixedly installed at a corresponding position on the upper middle of the base. A central cylinder is vertically installed in the center of the cylindrical body between the lower part of the upper head and the top of the conical hopper. A blind plug is fixedly installed at the top outlet of the central cylinder, and a filter head is installed at the bottom outlet of the central cylinder. A support is fixedly connected between the filter head and the base at the bottom of the conical hopper. The device has an exhaust port on the upper end cap, and symmetrical liquid inlets on the upper part of the cylinder. The liquid inlets on the left and right sides of the cylinder are fixedly connected to the central cylinder by liquid inlet pipes. An overflow device is installed at the highest liquid level in the cylinder. An outlet is installed on the cylinder between the bottom of the overflow device and the liquid inlet. A drain pipe is fixedly connected between the overflow device and the outlet. A first mud discharge port is opened on the bottom of the hopper wall of the conical hopper, and a second mud discharge port is opened on the bottom of the cylinder wall. A mud discharge pipe is fixedly connected between the first mud discharge port and the second mud discharge port.

3. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 2, characterized in that... The filter head includes a reducer and a filter plate. The bottom outlet of the central cylinder is fixedly connected to the small end of the reducer. The filter plate is installed inside the reducer, and the filter plate has several through-holes. A support device is fixedly installed between the filter plate and the base.

4. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 2 or 3, characterized in that... The support device includes a first support pipe and a second support pipe. The first support pipe is provided between the lower part of the outlet of the large and small end fitting and the center of the base at the bottom of the conical hopper. The bottom end of the first support pipe is fixed to the base, and a conical blind plug is fixedly installed at the top end of the first support pipe. The second support pipe is fixedly connected between the bottom surface of the filter plate and the conical blind plug.

5. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 4, characterized in that... The overflow device includes a circular drainage groove and a support frame. A circular drainage groove with an upward-facing opening is embedded in the inner side of the cylinder wall at the liquid inlet at the top of the liquid pipe. Several support frames are symmetrically arranged at intervals along the circumference of the cylinder between the circular drainage groove and the cylinder. The liquid pipe is fixedly connected between the bottom of the circular drainage groove and the liquid outlet of the cylinder.

6. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 5, characterized in that... The height of the inner wall of the annular drainage trough is lower than that of the outer wall. Several trapezoidal weir teeth are continuously arranged along the circumference at the top of the inner wall of the annular drainage trough, and a V-shaped overflow port is formed between each adjacent trapezoidal weir tooth.

7. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 2, 3, 5, or 6, characterized in that... A mother liquor input pipeline is fixedly connected to the upper left inlet of the vertical flow settling tank. A diversion pipeline is fixedly connected between the mother liquor input pipeline and the upper right inlet of the vertical flow settling tank. A mother liquor buffer pipeline is fixedly connected between the upper outlet of the vertical flow settling tank and the top inlet of the mother liquor pool. A waste gas output pipeline is fixedly connected between the top exhaust port of the vertical flow settling tank and the upper inlet of the waste gas collection tank. A sludge discharge pipeline is fixedly connected between the lower second sludge discharge port of the vertical flow settling tank and the top inlet of the sludge discharge pool.

8. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 7, characterized in that... A first delivery pump and a first control valve are fixedly installed sequentially along the medium flow direction on the mother liquor input pipeline between the mother liquor input pipeline inlet and the branch pipeline. A second control valve is fixedly installed on the sludge discharge pipeline. A second delivery pump is fixedly installed on the mother liquor output pipeline.

9. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 8, characterized in that... Manholes are provided at the lower part of the hopper wall of the conical hopper and at the lower part of the cylinder of the vertical flow settling tank. The manholes are sealed and fixed by manhole flange covers.

10. The buffer homogenizing device for polyvinyl chloride centrifuged mother liquor water according to claim 9, characterized in that... A level gauge and a temperature gauge are fixedly installed on the upper part of the conical hopper.

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