VCM device compression process system

Abstract

The utility model discloses a VCM device compression process system, and relates to the technical field of chemical production. The device comprises a VCM compressor unit, an inlet of the VCM compressor unit is connected with a compressor inlet header pipe, an outlet of the VCM compressor unit is connected with a compressor outlet header pipe, an inlet of an after-machine cooler is connected with a compressor outlet header pipe, an outlet of the after-machine cooler is connected with a gas-liquid separator, and material gas flows through the after-machine cooler in an upper-inlet and lower-outlet mode. According to the VCM waste water treatment and recovery device, accumulated liquid generated in the operation process is prevented from being deposited in the after-machine cooler, convenience is provided for liquid drainage of the after-machine cooler, the accumulated liquid of a lower sealing head of the after-machine cooler automatically flows into the gas-liquid separator, and a liquid drainage opening of the gas-liquid separator is connected with the VCM waste water treatment and recovery device. An exhaust port of the gas-liquid separator is respectively connected with the monomer dehydration plant and one end of the compressor return valve group, and the other end of the compressor return valve group is connected with the compressor inlet header pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to a compression process system of a VCM device. Background Art

[0002] Vinyl chloride (VCM) is mainly used to manufacture homopolymers and copolymers of polyvinyl chloride and is an important raw material in the PVC chemical production process.

[0003] After being compressed by the compressor, the raw vinyl chloride gas enters the aftercooler for cooling. The cooled vinyl chloride gas then enters the monomer dehydration unit. Existing aftercoolers are mostly installed horizontally. Horizontal units have a low heat transfer coefficient, resulting in high return temperatures, high overall compressor temperatures, poor internal oil-gas separator effectiveness, and increased oil mist entrainment in the gas phase. Furthermore, the condensed oil and water in horizontal units are temporarily stored at the bottom of the unit and are easily re-entrained into the monomer dehydration system at the outlet. This shortens the life of the packing in the drying tower of the monomer dehydration system, causes caking, and accelerates corrosion of the load-bearing wire mesh. Utility Model Content

[0004] In response to the above technical problems, the utility model provides a VCM device compression process system, which is used to solve the problem that the oil and water condensed in the existing after-cooler are easily entrained into the monomer dehydration system at the outlet, resulting in a shortened life of the packing in the drying tower of the monomer dehydration system, the formation of lumps, and accelerated corrosion of the load-bearing wire mesh.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0006] A VCM device compression process system includes a VCM compressor unit, wherein the inlet of the VCM compressor unit is connected to the compressor inlet main pipe, and the outlet of the VCM compressor unit is connected to the compressor outlet main pipe. The system also includes an aftercooler, a gas-liquid separator, a monomer dehydration plant and a compressor return valve group. The inlet of the aftercooler is connected to the compressor outlet main pipe, the outlet of the aftercooler is connected to the gas-liquid separator, the discharge port of the gas-liquid separator is connected to the VCM wastewater treatment and recovery device, the exhaust port of the gas-liquid separator is respectively connected to the monomer dehydration plant and one end of the compressor return valve group, and the other end of the compressor return valve group is connected to the compressor inlet main pipe.

[0007] Furthermore, an HP type wire mesh foam catcher is provided at the upper end of the gas-liquid separator.

[0008] Furthermore, a remote level gauge is installed on the gas-liquid separator, the input detection end of the remote level gauge is located in the gas-liquid separator, the output control end of the remote level gauge is connected to an automatic control valve, and the automatic control valve is installed on the discharge port of the gas-liquid separator.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: the material gas output by the VCM compressor unit flows through the aftercooler in an upper inlet and lower outlet manner, thereby preventing the accumulated liquid generated during operation from accumulating inside the aftercooler, providing convenience for the drainage of the aftercooler, and allowing the accumulated liquid in the lower head of the aftercooler to flow into the gas-liquid separator by gravity. Since the operating temperature of the gas-liquid separator is 50~55°C, even if the accumulated liquid contains liquid vinyl chloride, the liquid vinyl chloride will be completely vaporized and enter the monomer dehydration plant after long-term operation at this temperature, and the temporary storage of condensed oil and water will not occur; the liquid phase separated in the gas-liquid separator is detected in real time by a remote liquid level gauge. When the liquid phase inside it reaches the set threshold value of the remote liquid level gauge, the automatic control valve is automatically controlled to open, and the liquid phase inside it is discharged from the equipment and transported to the VCM wastewater treatment and recovery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] In the picture:

[0012] 1. VCM compressor unit; 2. Compressor inlet manifold; 3. Compressor outlet manifold; 4. Aftercooler; 5. Gas-liquid separator; 6. Compressor return valve group; 7. VCM wastewater treatment and recovery device; 8. Monomer dehydration plant; 9. HP wire mesh foam collector; 10. Remote liquid level gauge; 11. Automatic control valve. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0014] A VCM device compression process system includes a VCM compressor unit 1, the inlet of the VCM compressor unit 1 is connected to the compressor inlet main pipe 2, and the outlet of the VCM compressor unit 1 is connected to the compressor outlet main pipe 3. The system also includes an aftercooler 4, a gas-liquid separator 5, a monomer dehydration plant 8 and a compressor return valve group 6. The inlet of the aftercooler 4 is connected to the compressor outlet main pipe 3, the outlet of the aftercooler 4 is connected to the gas-liquid separator 5, the discharge port of the gas-liquid separator 5 is connected to the VCM wastewater treatment and recovery device 7, the exhaust port of the gas-liquid separator 5 is respectively connected to the monomer dehydration plant 8 and one end of the compressor return valve group 6, and the other end of the compressor return valve group 6 is connected to the compressor inlet main pipe 2.

[0015] An HP type wire mesh mist collector 9 is provided at the upper end of the gas-liquid separator 5 . After the gas phase passes through the HP type wire mesh mist collector 9 for secondary oil mist removal, the gas phase is transported to the monomer dehydration workshop 8 .

[0016] A remote level gauge 10 is installed on the gas-liquid separator 5 , the input detection end of the remote level gauge 10 is located inside the gas-liquid separator 5 , and the output control end of the remote level gauge 10 is connected to an automatic control valve 11 , which is installed on the discharge port of the gas-liquid separator 5 .

[0017] When using:

[0018] After compression by VCM compressor unit 1, crude vinyl chloride gas is cooled in aftercooler 4. The cooled oil and water automatically condense at the lower end of the equipment and flow through the drain port to gas-liquid separator 5. After cooling, the gas phase enters the gas-liquid separator 5 along a tangential direction of the cylinder, forming a cyclone and achieving cyclonic separation. After secondary oil mist removal by HP-type wire mesh mist collector 9 at the top of the separator, the gas phase is then transported to the monomer dehydration plant 8. The liquid phase separated in gas-liquid separator 5 is monitored in real time by a remote level gauge 10. When the liquid phase reaches the set threshold of remote level gauge 10, automatic control valve 11 is automatically controlled to open, discharging the liquid phase from the equipment and transporting it to VCM wastewater treatment and recovery unit 7.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A VCM device compression process system, comprising a VCM compressor unit (1), wherein the inlet of the VCM compressor unit (1) is connected to a compressor inlet main pipe (2), and the outlet of the VCM compressor unit (1) is connected to a compressor outlet main pipe (3), characterized in that: The invention also includes an aftercooler (4), a gas-liquid separator (5), a monomer dehydration plant (8) and a compressor return valve group (6). The inlet of the aftercooler (4) is connected to the compressor outlet main pipe (3), the outlet of the aftercooler (4) is connected to the gas-liquid separator (5), the discharge port of the gas-liquid separator (5) is connected to the VCM wastewater treatment and recovery device (7), the exhaust port of the gas-liquid separator (5) is respectively connected to the monomer dehydration plant (8) and one end of the compressor return valve group (6), and the other end of the compressor return valve group (6) is connected to the compressor inlet main pipe (2).

2. A VCM device compression process system according to claim 1, characterized in that: An HP type wire mesh foam catcher (9) is provided at the upper end of the gas-liquid separator (5).

3. A VCM device compression process system according to claim 2, characterized in that: A remote level gauge (10) is installed on the gas-liquid separator (5). The input detection end of the remote level gauge (10) is located inside the gas-liquid separator (5). The output control end of the remote level gauge (10) is connected to an automatic control valve (11). The automatic control valve (11) is installed on the discharge port of the gas-liquid separator (5).

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