PVC (polyvinyl chloride) polymerization stripping tower tray flushing device

Abstract

The utility model relates to the technical field of chemical production, in particular to a PVC (Polyvinyl Chloride) polymerization stripping tower tray flushing device, and aims to solve the problem that the flushing cost of a polymerization stripping tower tray is higher due to the fact that a mode of circularly flushing the tray by desalted water is generally adopted in the process of flushing the PVC polymerization stripping tower tray at present. According to the device, centrifugal mother liquor conveying structures such as a centrifugal mother liquor control valve, a centrifugal mother liquor pipeline, a centrifugal mother liquor filter, a plate heat exchanger, an automatic control valve and a mass flow meter are additionally arranged in a PVC (Polyvinyl Chloride) polymerization stripping tower, so that tower tray washing water of the stripping tower is changed into the centrifugal mother liquor from desalted water during operation of the PVC polymerization stripping tower, the centrifugal mother liquor is pretreated in advance, and the production efficiency of the PVC polymerization stripping tower is improved. Therefore, the efficient flushing of the centrifugal mother liquor to the tray of the stripping tower is ensured, the flushing mode of the stripping tower is optimized, the consumption of desalted water is reduced, and the overall operation cost of the stripping tower is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to a PVC polymerization stripping tower tray flushing device. Background Art

[0002] During the PVC chemical production process, preheated slurry enters the top of the stripping tower, where it undergoes mass and heat transfer with steam entering the tower's bottom to remove the VCM monomer from the slurry. The vaporized VCM is then cooled and pumped to a recovery gas tank via a vacuum pump. The stripper discharge pump then pumps the de-monomerized slurry into the slurry tank. To prevent material buildup on the stripping tower trays, desalinated water is commonly used for tray flushing. However, the extensive use of desalinated water over long periods of operation can lead to a rapid increase in PVC production costs. Utility Model Content

[0003] The utility model provides a PVC polymerization stripping tower tray flushing device to solve the problems existing in the above background.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A PVC polymerization stripping tower tray flushing device includes a stripping tower condenser, the inlet of the stripping tower condenser is connected to a hot water tank, the outlet of the hot water tank is connected to the stripping tower, the top of the stripping tower is connected to a stripping tower condenser, and pipelines are connected between the stripping tower condenser and the hot water tank and the stripping tower condenser. The inlet of the stripping tower condenser is also connected to a plate heat exchanger, and the inlet of the plate heat exchanger is connected to a centrifugal mother liquor control valve.

[0006] Furthermore, a centrifugal pump is provided on the pipeline between the hot water tank and the stripping tower, and a slurry inlet and a slurry outlet are respectively provided on the side of the stripping tower.

[0007] Furthermore, a mass flow meter and an automatic control valve are sequentially provided on the connecting pipe from the stripping tower condenser to the plate heat exchanger, and a centrifugal mother liquor filter is also provided on the pipe between the plate heat exchanger and the centrifugal mother liquor control valve.

[0008] Furthermore, the side of the stripping tower condenser is connected to the gas cabinet, and the bottom of the stripping tower condenser is connected to the wastewater tank.

[0009] The utility model has the following beneficial effects:

[0010] The utility model provides a PVC polymerization stripping tower tray flushing device. By adding a centrifugal mother liquor control valve, a centrifugal mother liquor pipeline, a centrifugal mother liquor filter, a plate heat exchanger, an automatic control valve, a mass flow meter and other centrifugal mother liquor conveying structures in the PVC polymerization stripping tower, during the operation of the PVC polymerization stripping tower, the stripping tower tray flushing water is changed from desalted water to centrifugal mother liquor, thereby achieving early pretreatment of the centrifugal mother liquor, thereby ensuring efficient flushing of the stripping tower tray by the centrifugal mother liquor, and at the same time optimizing the flushing mode of the stripping tower, reducing the consumption of desalted water, further reducing the overall operating cost of the stripping tower, and solving the problem of high flushing cost of the polymerization stripping tower tray due to the common use of a desalted water circulation flushing method in the current process of flushing the PVC polymerization stripping tower tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0012] The meanings of the reference numerals are as follows:

[0013] 1. Stripping tower condenser; 2. Desalted water control valve; 3. Desalted water; 4. Centrifuged mother liquor; 5. Centrifuged mother liquor control valve; 6. Centrifuged mother liquor filter; 7. Plate heat exchanger; 8. Automatic control valve; 9. Mass flow meter; 10. Stripping tower condenser; 11. Stripping tower; 12. Hot water tank; 13. Centrifugal pump; 14. Steam; 15. Slurry inlet; 16. Slurry outlet; 17. Gas holder; 18. Wastewater tank. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1 As shown, a PVC polymerization stripping tower tray flushing device includes a stripping tower condenser 1, the inlet of the stripping tower condenser 1 is connected to a hot water tank 12, the outlet of the hot water tank 12 is connected to a stripping tower 11, the top of the stripping tower 11 is connected to a stripping tower condenser 10, and the stripping tower condenser 10 is connected to the hot water tank 12 and the stripping tower condenser 1 through pipelines. The inlet of the stripping tower condenser 10 is also connected to a plate heat exchanger 7, and the inlet of the plate heat exchanger 7 is connected to a centrifugal mother liquor control valve 5.

[0016] A centrifugal pump 13 is provided on the pipeline between the hot water tank 12 and the stripping tower 11 , and a slurry inlet 15 and a slurry outlet 16 are provided on the side of the stripping tower 11 .

[0017] A mass flow meter 9 and an automatic control valve 8 are sequentially provided on the connecting pipe from the stripping tower condenser 10 to the plate heat exchanger 7 , and a centrifugal mother liquor filter 6 is also provided on the pipe between the plate heat exchanger 7 and the centrifugal mother liquor control valve 5 .

[0018] The side of the stripping tower condenser 1 is connected to the gas cabinet 17 , and the bottom of the stripping tower condenser 1 is connected to the waste water tank 18 .

[0019] In a specific application of the present invention, the centrifugal mother liquor 4 is obtained by filtration after centrifugation of the slurry. The water quality itself can replace the desalted water 3 as the flushing water of the stripping tower 11. However, the centrifugal mother liquor 4 still contains a small amount of PVC, which will clog the tower tray and cause self-polymerization and clogging of the pipeline if used for a long time. In addition, the temperature of the centrifugal mother liquor 4 is relatively high. Direct use of the centrifugal mother liquor 4 will lead to a poor cooling effect of the stripping tower condenser 10, resulting in an increase in the load of the stripping tower full condenser 1, which in turn affects the normal operation of the stripping system. Therefore, a centrifuge mother liquor 4 pipeline is incorporated into the original desalted water 3 pipeline, and a centrifuge mother liquor control valve 5 is added to ensure that the centrifuge mother liquor 4 and the desalted water 3 can be freely switched for use. Considering that the centrifuge mother liquor 4 contains a small amount of PVC particles, a centrifuge mother liquor filter 6 is added before entering the stripping tower condenser 10, and then a plate heat exchanger 7 is added to reduce the temperature of the centrifuge mother liquor 4, thereby ensuring that the temperature of the centrifuge mother liquor 4 meets the condensation requirement of the stripping tower condenser 10. Finally, an automatic control valve 8 and a mass flow meter 9 are added to achieve timely adjustment of the flow rate according to the operating status of the stripping tower 11, thereby achieving early pretreatment of the centrifuge mother liquor 4, thereby ensuring that the centrifuge mother liquor 4 efficiently flushes the stripping tower 11 tray. At the same time, the flushing mode of the stripping tower 11 is optimized, the consumption of desalted water 3 is reduced, and the overall operating cost of the stripping tower 11 is further reduced. Therefore, the device has good practicality.

Claims

1. A PVC polymerization stripping tower tray flushing device, characterized by: The invention comprises a stripping tower condenser (1), wherein the inlet of the stripping tower condenser (1) is connected to a hot water tank (12), the outlet of the hot water tank (12) is connected to a stripping tower (11), the top of the stripping tower (11) is connected to a stripping tower condenser (10), and the stripping tower condenser (10) is connected to the hot water tank (12) and the stripping tower condenser (1) by pipelines, the inlet of the stripping tower condenser (10) is also connected to a plate heat exchanger (7), and the inlet of the plate heat exchanger (7) is connected to a centrifugal mother liquor control valve (5).

2. A PVC polymerization stripping tower tray flushing device according to claim 1, characterized in that: A centrifugal pump (13) is provided on the pipeline between the hot water tank (12) and the stripping tower (11), and a slurry inlet (15) and a slurry outlet (16) are respectively provided on the side of the stripping tower (11).

3. A PVC polymerization stripping tower tray flushing device according to claim 1, characterized in that: A mass flow meter (9) and an automatic control valve (8) are sequentially provided on the connecting pipe from the stripping tower condenser (10) to the plate heat exchanger (7), and a centrifugal mother liquor filter (6) is also provided on the pipe between the plate heat exchanger (7) and the centrifugal mother liquor control valve (5).

4. A PVC polymerization stripping tower tray flushing device according to claim 1, characterized in that: The side of the stripping tower condenser (1) is connected to the gas cabinet (17), and the bottom of the stripping tower condenser (1) is connected to the waste water tank (18).

Images