Gas-phase vinyl chloride filtering device

Abstract

The utility model discloses a gas-phase vinyl chloride filtering device which comprises a tank body, a partition plate which divides the tank body into an upper chamber and a lower chamber is arranged in the tank body, a plurality of hollow supporting columns are arranged in the lower chamber, a filter bag is arranged in each supporting column, the upper ends of the supporting columns are connected to the partition plate, and the lower ends of the supporting columns are connected to the upper end of the partition plate. The filter bag is arranged in the tank body and is communicated with the upper chamber, the upper chamber is communicated with a back flushing system for preventing the filter bag from being blocked, and the tank body is provided with a material outlet and a material inlet. The problems that the filter bag of the gas-phase vinyl chloride filter is hardened, blocked and frequently overhauled are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vinyl chloride recovery, in particular to a gas phase vinyl chloride filtering device. Background Art

[0002] In the late stage of vinyl chloride bulk polymerization, unconverted vinyl chloride monomer needs to be recovered. The recovery method adopts gas phase recovery. Vinyl chloride gas carries PVC powder or water vapor droplets, which often clogs the filter bag, reduces the service life of the filter bag, and requires frequent cleaning and maintenance of the filter. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a gas phase vinyl chloride filtering device, which solves the problems of gas phase vinyl chloride filter bag blockage and frequent maintenance.

[0004] The utility model solves the above-mentioned technical problem with the following technical solution: a gas-phase vinyl chloride filtering device, comprising a tank body, wherein the tank body is provided with a partition which divides the tank body into an upper chamber and a lower chamber which are independent of each other, the lower chamber is provided with a plurality of hollow support columns, each of the support columns is provided with a filter bag, the upper ends of the plurality of support columns are connected to the partition and communicated with the upper chamber, the lower ends of the plurality of support columns are open, the upper chamber is communicated with a backflush system which prevents the filter bag from being blocked, the tank body is provided with a discharge port and a feed port, the discharge port is communicated with the upper chamber, and the feed port is communicated with the lower chamber.

[0005] The beneficial effects of adopting the above technical solution are:

[0006] The backflush system installed on the tank body can make the filter bags in the support column vibrate, thus solving the problems of gas phase vinyl chloride filter bag blockage and frequent maintenance.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the back-blowing system includes a back-blowing air pipe and an air storage bag, one end of the back-blowing air pipe is connected to the air outlet of the air storage bag, and the other end thereof passes through the tank body and is connected to the upper chamber.

[0009] The beneficial effect of adopting the above further solution is that a certain amount of gas is stored in the gas storage bag, and then the gas is blown into the tank body through the back-blowing air pipe, thereby causing the filter bag in the support column to shake.

[0010] Furthermore, the backflush system also includes a low-pressure nitrogen main line and a first gas pipeline, one end of the low-pressure nitrogen main line is connected to one end of the first gas pipeline, and the other end of the first gas pipeline is connected to the air inlet of the gas storage bag through a flexible pipeline.

[0011] The beneficial effect of adopting the above further solution is that the low-pressure nitrogen main line transports the low-pressure nitrogen to the gas storage bag through the first gas transmission pipeline, which is convenient for subsequent backflush operations.

[0012] Furthermore, it also includes a displacement pipeline, one end of which is connected to the low-pressure nitrogen main pipeline, and the other end of which is connected to the lower chamber. One end of a safety pipeline is connected to the displacement pipeline, and the other end of the safety pipeline is a vent. A bursting disc and a safety valve are provided on the safety pipeline.

[0013] The beneficial effect of adopting the above further scheme is that the replacement pipeline can replace the harmful gas inside the tank during maintenance. A bursting disc and a safety valve are arranged on the replacement pipeline to prevent excessive pressure in the tank during normal operation.

[0014] Furthermore, the replacement pipeline is also connected to one end of an exhaust pipeline, and the other end of the exhaust pipeline is connected to the other end of the safety pipeline.

[0015] The beneficial effect of adopting the above further solution is that the gas in the tank can be discharged through the exhaust pipeline.

[0016] Furthermore, the lower chamber is connected to a hot water circulation system.

[0017] The beneficial effect of adopting the above further solution is to utilize the hot water circulation system to prevent the water vapor impurities from liquefying and wetting the filter bag.

[0018] Furthermore, the hot water circulation system includes a power source pipeline and a return pipeline, the power source pipeline is provided with a regulating valve, one end of the power source pipeline is connected to one end of the water inlet pipeline, and the other end of the water inlet pipeline is connected to the lower chamber, the water inlet pipeline is provided with a circulating pump, one end of the return pipeline is connected to the lower chamber, and the other end thereof is connected to the water inlet pipeline.

[0019] The beneficial effect of adopting the above further scheme is that the power source pipeline brings hot water into the interlayer of the tank body through the water inlet pipeline, the water after heating the tank body flows out from the return pipeline, and the heated water can be circulated using a circulating pump.

[0020] Furthermore, a remote thermometer is provided on the water inlet pipeline.

[0021] The beneficial effect of adopting the above further solution is that the water temperature of the hot water pipeline can be detected.

[0022] Furthermore, the lower chamber is connected to a hot water outlet for connecting to a hot water return tank pipeline, and one end of the water return pipeline is connected to the hot water return tank pipeline.

[0023] The beneficial effect of adopting the above further solution is that when the hot water temperature is not high enough, part of the hot water is recovered to the recovery tank.

[0024] Furthermore, a slag discharge port is provided at the bottom of the tank body.

[0025] The beneficial effect of adopting the above further solution is that during the filtration process of gas-phase vinyl chloride, the filter bag will block the PVC powder and discharge the PVC powder through the slag discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Tank body; 2. Support column; 3. Filter bag; 4. Backflush air pipe; 5. Air storage bag; 6. Discharge port; 7. Feed port; 8. Slag discharge port; 9. Low-pressure nitrogen main pipeline; 10. First gas transmission pipeline; 11. Replacement pipeline; 12. Bursting disc; 13. Safety valve; 14. Drain pipeline; 15. Power source pipeline; 16. Spare pipeline; 17. Regulating valve; 18. Water inlet pipeline; 19. Return water pipeline; 20. Circulation pump; 21. Remote thermometer; 22. Return water tank pipeline; 23. Separation pipeline; 24. Gas-water separation tank; 25. Partition; 26. Hot water outlet. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] Embodiment 1:

[0031] like Figure 1 As shown, in this embodiment, a gas-phase vinyl chloride filtering device includes a tank body 1, wherein a partition 25 is provided in the tank body 1 for dividing the tank body 1 into an upper chamber and a lower chamber which are independent of each other, wherein a plurality of hollow support columns 2 are provided in the lower chamber, wherein a filter bag 3 is provided in each of the support columns 2, wherein the upper ends of the plurality of support columns 2 are connected to the partition 25 and communicated with the upper chamber, and the lower ends of the plurality of support columns 2 are open, wherein the upper chamber is communicated with a back-blowing system for preventing the filter bag 3 from being blocked, and wherein a discharge port 6 and a feed port 7 are provided on the tank body 1, wherein the discharge port 6 is communicated with the upper chamber, and the feed port 7 is communicated with the lower chamber.

[0032] The beneficial effect of this embodiment is that the backflush system arranged on the tank body 1 can make the filter bag 3 in the support column 2 shake, thereby solving the problem of the filter bag of the gas phase vinyl chloride filter being clogged and frequently overhauled.

[0033] When the device is used, the feed port 7 on the tank body 1 is connected to the VC polymerization kettle through a pipeline. At this time, the recovered vinyl chloride gas is entrained with PVC powder. The tank body 1 is divided into an upper chamber and a lower chamber that are independent of each other by a partition 25, so that the gas with impurities can only enter the upper chamber after filtering the PVC powder through the filter bag 3 from the support column 2 inside the lower chamber. Then, the backflush system can be used to shake the filter bag 3 to accumulate the powder at the bottom of the tank body 1, and the filtered gas is discharged from the discharge port 6.

[0034] Among them, Figure 1 As shown, a feed port 7 is disposed at the lower portion of the tank body 1, and a discharge port 6 is disposed at the upper portion, and both the discharge port 6 and the feed port 7 are communicated with the lower chamber.

[0035] Furthermore, the filter bag 3 is a polyester filter bag coated with polytetrafluoroethylene, which has strong water-repellent and oil-repellent properties and good anti-clogging performance.

[0036] Furthermore, the support column 2 plays the role of supporting the filter bag 3 and serving as a backwash gas channel.

[0037] Example 2

[0038] Preferably, based on Example 1, the backblowing system includes a backblowing air pipe 4 and an air storage bag 5, one end of the backblowing air pipe 4 is connected to the air outlet of the air storage bag 5, and the other end thereof passes through the tank body 1 and is connected to the upper chamber.

[0039] The beneficial effect of this embodiment is that a certain amount of gas is stored in the gas storage bag 5, and then the gas is blown into the tank body 1 through the back-blowing air pipe 5, so that the filter bag 3 in the support column 2 is shaken.

[0040] Furthermore, there can be multiple back-blowing air pipes 4, which correspond one-to-one to the number of support columns 2. The air outlet ends of the multiple back-blowing air pipes 4 extend downward through the top of the tank body 1 into the upper chamber, and the air outlet end of each corresponding back-blowing air pipe 4 is located vertically above the upper end of the support column 2.

[0041] Furthermore, a plurality of through holes are annularly arranged on the partition 25, and the lower ends of the plurality of through holes are connected to the upper ends of the corresponding support columns 2 through Venturi tubes to increase the circulation speed of the gas, and the upper ends of the plurality of through holes are located vertically below the outlet ends of the corresponding backblowing air pipes 4.

[0042] Furthermore, each back-blowing air pipe 4 is provided with a corresponding solenoid valve, which is controlled by an existing timing controller, is easy to operate, and improves the efficiency of cleaning the filter bag 3 .

[0043] Example 3

[0044] Preferably, on the basis of Example 2, the backflush system also includes a low-pressure nitrogen main line 9 and a first gas pipeline 10, one end of the low-pressure nitrogen main line 9 is connected to one end of the first gas pipeline 10, and the other end of the first gas pipeline 10 is connected to the air inlet of the gas storage bag 5 through a flexible pipeline.

[0045] The beneficial effect of this embodiment is that the low-pressure nitrogen main pipeline 9 transports the low-pressure nitrogen to the gas storage bag 5 through the first gas pipeline 10, which is convenient for subsequent backflush operation.

[0046] It should be noted that the flexible pipeline can be replaced during the maintenance of the tank body 1. A metal hose or a plastic pipe can be selected. A valve is provided on the flexible pipeline to facilitate the adjustment of the flow rate of nitrogen.

[0047] Example 4

[0048] Preferably, on the basis of Example 3, it further includes a displacement pipeline 11, one end of the displacement pipeline 11 is connected to the low-pressure nitrogen main pipeline 9, and the other end thereof is connected to the lower chamber, one end of a safety pipeline is connected to the displacement pipeline 11, the other end of the safety pipeline is a vent, and a bursting disc 12 and a safety valve 13 are provided on the safety pipeline.

[0049] The beneficial effect of this embodiment is that the replacement pipeline 11 can replace harmful gases in the replacement pipeline 11 when the tank body 1 is being repaired. A bursting disc 12 and a safety valve 13 are arranged on the replacement pipeline 11 to prevent accidents caused by excessive pressure in the tank body 1 during normal operation.

[0050] Furthermore, a pressure gauge may be provided on the tank body 1 to facilitate monitoring of the pressure inside the tank body 1 .

[0051] Example 5

[0052] Preferably, on the basis of Embodiment 4, the replacement pipeline 11 is further connected to one end of an exhaust pipeline 14, and the other end of the exhaust pipeline 14 is connected to the other end of the safety pipeline.

[0053] The beneficial effect of this embodiment is that the gas in the tank body 1 can be discharged through the exhaust pipe 14 .

[0054] Example 6

[0055] Preferably, based on embodiments 1-5, the lower chamber is connected to a hot water circulation system.

[0056] The beneficial effect of this embodiment is that the hot water circulation system is used to prevent the vinyl chloride or water vapor impurities from liquefying when the temperature is too low, and to wet the filter bag 3.

[0057] Example 7

[0058] Preferably, on the basis of Example 6, the hot water circulation system includes a power source pipeline 15 and a return pipeline 19, the power source pipeline 15 is provided with a regulating valve 17, one end of the power source pipeline 15 is connected to one end of a water inlet pipeline 18, the other end of the water inlet pipeline 18 is connected to the lower chamber, the water inlet pipeline 18 is provided with a circulating pump 20, one end of the return pipeline 19 is connected to the lower chamber, and the other end thereof is connected to the water inlet pipeline 18.

[0059] The beneficial effect of this embodiment is that the power source pipeline 15 brings hot water into the interlayer of the tank body 1 through the water inlet pipeline 18, and the water after heating the tank body 1 flows out from the return pipeline 19, and the heated water can be circulated by the circulation pump 20.

[0060] Furthermore, a backup pipeline 16 is connected in parallel to the power source pipeline 15 , and a valve is provided on the backup pipeline 16 . When the regulating valve 17 fails, hot water can be supplied to the water inlet pipeline 18 through the backup pipeline 16 .

[0061] Example 8

[0062] Preferably, based on Example 7, a remote thermometer 21 is provided on the water inlet pipeline 18 .

[0063] The beneficial effect of this embodiment is that the water temperature of the hot water pipeline 18 can be detected, so that the heating temperature in the tank body 1 can be adjusted at any time to improve the heating effect.

[0064] Example 9

[0065] Preferably, on the basis of Embodiments 7-8, the tank body 1 is provided with a hot water outlet 26 for communicating with a heat return tank pipeline 22 , and one end of the return water pipeline 19 is connected to the heat return tank pipeline 22 .

[0066] The beneficial effect of this embodiment is that when the hot water temperature is not high enough, part of the hot water is recovered to the recovery tank.

[0067] The heat return tank pipeline 22 is also connected to a separation pipeline 23 , and a gas-water separation tank 24 is provided on the separation pipeline 23 .

[0068] Example 10

[0069] Preferably, based on embodiments 1-9, a slag discharge port 8 is provided at the bottom of the tank body 1.

[0070] The beneficial effect of this embodiment is that during the filtration of gaseous vinyl chloride, the filter bag will block the PVC powder and discharge the PVC powder through the slag discharge port.

[0071] Furthermore, the slag discharge port 8 is trumpet-shaped, which facilitates the rapid discharge of waste from the tank body 1.

[0072] The tank body 1 includes an upper head and a barrel. The barrel is cylindrical, the upper head is hemispherical, and the bottom of the barrel is conical, which is convenient for removing the filtered PVC powder during maintenance.

[0073] The workflow of this utility model:

[0074] 1. Vinyl chloride gas (containing PVC, water vapor and other impurities) from the polymerization kettle enters the vinyl chloride degassing tank 1, is filtered by the polyester filter bag 3, and the solid impurities are intercepted and attached to the filter bag 3. The vinyl chloride gas and water vapor enter the VC recovery system through the automatic valve control. The PVC powder and other solid impurities attached to the filter bag 3 fall off and enter the bottom of the tank 1 through backblowing. The gas in the tank 1 is replaced by nitrogen and discharged regularly through the slag discharge port 8.

[0075] 2. Hot water enters the interlayer of the tank body 1 through the circulation pump 20 to heat the tank body 1. After being discharged from the hot water outlet 26 on the tank body 1 and passing through the gas-liquid separation tank 24, a part of the hot water returns to the inlet of the circulation pump 20, and the excess hot water overflows to the return water tank through the high level. The remote thermometer 21 and the regulating valve 17 form a temperature regulating loop. The heating temperature is set, and the regulating valve 17 automatically controls the amount of hot water added to ensure that the gaseous vinyl chloride and water vapor in the tank body 1 are not liquefied.

[0076] The beneficial effects of the utility model are:

[0077] The problem of gas phase vinyl chloride filter bag blockage and frequent maintenance is solved.

[0078] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0079] In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0080] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas phase vinyl chloride filtering device, characterized in that: The invention comprises a tank body (1), wherein a partition (25) is provided in the tank body (1) for dividing the tank body (1) into an upper chamber and a lower chamber which are independent of each other, wherein a plurality of hollow support columns (2) are provided in the lower chamber, wherein each of the support columns (2) is provided with a filter bag (3), wherein the upper ends of the plurality of support columns (2) are connected to the partition (25) and are communicated with the upper chamber, wherein the lower ends of the plurality of support columns (2) are open, wherein the upper chamber is communicated with a back-blowing system for preventing the filter bag (3) from being blocked, and wherein a discharge port (6) and a feed port (7) are provided on the tank body (1), wherein the discharge port (6) is communicated with the upper chamber, and the feed port (7) is communicated with the lower chamber.

2. A gas phase vinyl chloride filtering device according to claim 1, characterized in that: The back-blowing system comprises a back-blowing air pipe (4) and an air storage bag (5); one end of the back-blowing air pipe (4) is connected to the air outlet of the air storage bag (5), and the other end thereof passes through the tank body (1) and is connected to the upper chamber.

3. A gas phase vinyl chloride filtering device according to claim 2, characterized in that: The backflush system further comprises a low-pressure nitrogen main line (9) and a first gas supply line (10), one end of the low-pressure nitrogen main line (9) being connected to one end of the first gas supply line (10), and the other end of the first gas supply line (10) being connected to the gas inlet of the gas storage bag (5) via a flexible pipeline.

4. A gas phase vinyl chloride filtering device according to claim 3, characterized in that: It also comprises a displacement pipeline (11), one end of which is in communication with the low-pressure nitrogen main pipeline (9), and the other end of which is in communication with the lower chamber; one end of a safety pipeline is in communication with the displacement pipeline (11); the other end of the safety pipeline is a vent; and a bursting disc (12) and a safety valve (13) are provided on the safety pipeline.

5. A gas phase vinyl chloride filtering device according to claim 4, characterized in that: The replacement pipeline (11) is also connected to one end of an exhaust pipeline (14), and the other end of the exhaust pipeline (14) is connected to the other end of the safety pipeline.

6. A gas phase vinyl chloride filtering device according to claim 1, characterized in that: The lower chamber is connected to a hot water circulation system.

7. A gas phase vinyl chloride filtering device according to claim 6, characterized in that: The hot water circulation system comprises a power source pipeline (15) and a return water pipeline (19); the power source pipeline (15) is provided with a regulating valve (17); one end of the power source pipeline (15) is connected to one end of a water inlet pipeline (18); the other end of the water inlet pipeline (18) is connected to the lower chamber; the water inlet pipeline (18) is provided with a circulation pump (20); one end of the return water pipeline (19) is connected to the lower chamber, and the other end thereof is connected to the water inlet pipeline (18).

8. A gas phase vinyl chloride filtering device according to claim 7, characterized in that: The water inlet pipeline (18) is provided with a remote thermometer (21).

9. A gas phase vinyl chloride filtering device according to claim 7, characterized in that: The lower chamber is connected to a hot water outlet (26) for communicating with a hot water return tank pipeline (22), and one end of the water return pipeline (19) is connected to the hot water return tank pipeline (22).

10. A gas phase vinyl chloride filtering device according to any one of claims 1 to 7, characterized in that: The bottom of the tank body (1) is provided with a slag discharge port (8).

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