Automatic drainage cooling device used in vinyl chloride synthesis

Abstract

The utility model discloses an automatic drainage cooling device for vinyl chloride synthesis, belongs to the technical field of chemical production, and solves the problems that the sewage treatment efficiency is influenced and equipment and workers are easily and greatly influenced when hot water in an existing hot water tank is directly discharged to a sewage treatment station. The system comprises a hot water tank, a sewage station, a cooler and a PLC, the hot water input end of the cooler is connected to the hot water tank, the hot water output end of the cooler is connected to the sewage station, the cold water input end of the cooler is provided with a cooling water pipe, and the cooling water pipe is provided with a cooling water adjusting valve. And the PLC is respectively connected with the outlet thermometer and the cooling water regulating valve. The device is stable in operation, effectively solves the influence of direct discharge of hot water in the hot water tank on workers, equipment and environment, and has very high popularization value.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and in particular relates to an automatic drainage cooling device used in vinyl chloride synthesis. Background Art

[0002] In the production of polyvinyl chloride by the calcium carbide method, during the synthesis of vinyl chloride (VCM), hydrogen chloride and acetylene are converted into vinyl chloride monomer via a mercuric chloride catalyst. This reaction is exothermic and requires the circulation of hot water in the shell side of the converter. On the one hand, this can remove the heat of the converter reaction and ensure high temperatures during the reaction to avoid the loss of mercury content in the mercuric chloride catalyst; on the other hand, the use of hot water can ensure that the converter reaction temperature is controlled between 110-180°C. In view of the above two reasons, hot water needs to be introduced into the shell side of the converter for heat removal. Usually, a hot water pump is used to transport hot water in the hot water tank. After the heat removal is completed, the hot water continues to return to the hot water tank to form a closed cycle. The hot water system needs to start heating 10 hours before the device is started, and the heating requires steam heating in the hot water tank.

[0003] At present, during the daily production heating process, due to the continuous influx of steam condensate into the hot water tank, the liquid level of the hot water tank is too high, and hot water needs to be discharged regularly. However, the injection of hot water may cause thermal stress on the equipment of the sewage treatment station, especially components made of non-metallic materials such as plastic and rubber. Long-term contact with high-temperature water may accelerate aging, deformation or damage; high temperature may change the equilibrium state of certain chemical reactions in sewage treatment, such as flocculation and precipitation, thereby affecting the use effect of coagulants and flocculants and the sludge settling performance; if the operation is improper, it may cause safety hazards such as burns to the staff. Utility Model Content

[0004] The utility model provides an automatic drainage cooling device for vinyl chloride synthesis, which solves the problem that hot water from an existing hot water tank is directly discharged into a sewage treatment station, which affects the efficiency of sewage treatment and easily causes great impact on equipment and workers.

[0005] The technical solution of the utility model is: an automatic drainage cooling device for vinyl chloride synthesis, comprising: a hot water tank, a sewage station, a cooler and a PLC controller, the hot water input end of the cooler is connected to the hot water tank, the hot water output end of the cooler is connected to the sewage station, the cold water input end of the cooler is provided with a cooling water pipe, the cooling water pipe is provided with a cooling water regulating valve, and the PLC controller is respectively connected to an outlet thermometer and the cooling water regulating valve.

[0006] As a further improvement of the present invention, a drain valve is provided at the hot water input end of the cooler, a hot water tank level gauge is installed in the hot water tank, and a PLC controller is connected to the drain valve and the hot water tank level gauge respectively.

[0007] The beneficial effects of this utility model are as follows: It forms an interlocking system using a PLC controller, a drain valve, a hot water tank level gauge, an outlet thermometer, and a cooling water regulating valve. The cooling water regulating valve is constantly adjusted based on the cooler outlet thermometer to ensure the cooling water temperature meets the specified standard. Simultaneously, a hot water tank level gauge is provided to regulate the cooling water circulation volume and control the outlet water temperature, achieving automatic drainage and cooling of the hot water tank. This utility model operates stably, effectively addressing the impact of direct hot water discharge from the hot water tank on personnel, equipment, and the environment, and has strong promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic structural diagram of the utility model.

[0009] In the figure: 1-hot water tank, 2-drain valve, 3-cooler, 4-hot water circulation pump, 5-hot water tank level gauge, 6-outlet thermometer, 7-cooling water regulating valve, 8-hot water tank return pipe, 9-water supply valve, 10-steam valve, 11-cooling water valve, 12-sewage station, 13-PLC controller, 14-cooler outlet valve. DETAILED DESCRIPTION

[0010] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0011] like Figure 1 As shown, an automatic drainage cooling device for vinyl chloride synthesis includes: a hot water tank 1 and a sewage station 12.

[0012] An automatic drainage cooling device for vinyl chloride synthesis also includes a cooler 3 and a PLC controller 13. The hot water input end of the cooler 3 is connected to a hot water tank 1, and the hot water output end of the cooler 3 is connected to a sewage station 12. The cold water input end of the cooler 3 is provided with a cooling water pipe, and the cooling water pipe is provided with a cooling water regulating valve 7. The PLC controller 13 is respectively connected to an outlet thermometer 6 and the cooling water regulating valve 7.

[0013] A drain valve 2 is provided at the hot water input end of the cooler 3 , a hot water tank level gauge 5 is installed in the hot water tank 1 , and a PLC controller 13 is connected to the drain valve 2 and the hot water tank level gauge 5 respectively.

[0014] When in use, all pipes and fittings need to be pressurized for leak testing first, with a pressure of about 1.0 MPA to prevent hot water leakage in the pipes. Open the water filling valve 9 on the top of the hot water tank 1 to replenish water. When the liquid level of the hot water tank 1 reaches more than 80%, start the hot water circulation pump 4 for circulation. The outlet of the hot water circulation pump 4 is connected to several converter shells through pipelines for heat exchange. After heat exchange, water is replenished to the hot water tank through the hot water tank return pipe 8. When the liquid level of the hot water tank 1 is stable at 70%-80%, open the top steam valve 10 to heat the hot water tank, and open the cooler outlet valve 14 and the cooling water valve 11. When the hot water tank level gauge 5 detects that the liquid level exceeds 85%, the PLC controller 13 controls the drain shut-off valve 2 to open. Under the control of the PLC controller 13, the cooling water regulating valve 7 automatically adjusts the switch size according to the temperature of the outlet thermometer 6 and starts to adjust the cooling water volume. The outlet temperature of the hot water cooler is set between 25℃ and 40℃. The cooling water regulating valve 7 adjusts the cooling water circulation volume and controls the outlet water temperature according to this temperature range. When the hot water tank level gauge 5 monitors that the water level of the hot water tank 1 is lower than 70%, the drain shut-off valve 2 is closed, and the PLC controller 13 controls the cooling water regulating valve 7 to automatically close after 10 seconds.

Claims

1. An automatic drainage cooling device for vinyl chloride synthesis, comprising: A hot water tank (1) and a sewage station (12) are characterized in that they further include a cooler (3) and a PLC controller (13), wherein the hot water input end of the cooler (3) is connected to the hot water tank (1), the hot water output end of the cooler (3) is connected to the sewage station (12), the cold water input end of the cooler (3) is provided with a cooling water pipe, and the cooling water pipe is provided with a cooling water regulating valve (7), and the PLC controller (13) is respectively connected to the outlet thermometer (6) and the cooling water regulating valve (7).

2. The automatic drainage cooling device for vinyl chloride synthesis according to claim 1, characterized in that: A drain valve (2) is provided at the hot water input end of the cooler (3), a hot water tank level gauge (5) is installed in the hot water tank (1), and the PLC controller (13) is connected to the drain valve (2) and the hot water tank level gauge (5), respectively.

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