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Control method of sewage discharge and recovery for high-boiling tower of vinyl chloride

A control method and high-boiling tower technology, applied in the direction of distillation adjustment/control, disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of random manual operation, site abnormality, frequent operation, etc., to overcome the problem of product The impact of quality and safe production, the improvement of control accuracy and detection accuracy, and the effect of improving safety and stability

Active Publication Date: 2017-12-22
TIANCHEN CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The operation of blowdown and recovery of the original vinyl chloride high boiling tower is manual operation, and the blowdown interval time, blowdown time, stop time and reference process parameters need to be controlled during the operation process, the operation is frequent and the operation intensity is relatively high;
[0004] 2. The manual operation is random, and the operating curve or artificially recorded time is used as the basis for operation control. Human control is more difficult, and there are many mistakes. It is difficult to achieve the purpose of reasonable operation, and there are potential safety hazards in process operation.
[0005] 3. During the sewage discharge and recovery process of the high boiling tower, operators need to conduct on-site inspections in a timely manner. Sometimes abnormalities can be found on the site, and they can only call the central control operators to operate. There is a lag in operation, which is not conducive to safe production;
[0006] 4. When two high-boiling towers are put into production, operators often perform tower cutting operations, which is prone to operational errors

Method used

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  • Control method of sewage discharge and recovery for high-boiling tower of vinyl chloride
  • Control method of sewage discharge and recovery for high-boiling tower of vinyl chloride
  • Control method of sewage discharge and recovery for high-boiling tower of vinyl chloride

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Effect test

Embodiment 2

[0056] The difference between embodiment 2 and embodiment 1 is: the central control operation of DCS control program [manual] and [automatic], [start], [stop] and [pause] of high boiling tower 2 [drainage] and [recovery] are added Select the button and switch button, the operator can perform [Automatic] and [Start] on the central control operation station to select the linkage operation according to the actual situation on site, or pause or stop the step according to the timely production situation, click [Stop] and then proceed to [Manual 】The valve can be switched on and off during program control implementation.

Embodiment 3

[0057] Embodiment 3 differs from Embodiment 1 in that it is a control method for blowdown and recovery of vinyl chloride high-boiling towers, a newly added on-site operation control panel 21 in the process of blowdown→liquid intake→distillation→recovery→filling, Newly added manual control button 22, automatic control button 23, step-by-step control button 33, linkage control button 34, start control button 35, stop control button 36, pause control button 37, sewage control button 38, liquid inlet control button 39, Distillation control button 40, recovery control button 41, filling control button 42; newly added high boiling tower blowdown valve start and stop control 24, distillation three tower kettle hot water valve start and stop control 25, distillation three tower liquid inlet valve start and stop Control 26, start and stop control of monomer recovery valve of the third distillation tower 27, start and stop control of the circulation reflux valve of the third distillation...

Embodiment 4

[0058] The difference between embodiment 4 and embodiment 1 is that the DCS controls the internal switching value, and the internal switch and valve position start and reset procedures are newly added. Its function is to discharge sewage in the process of automatic operation of all programs→liquid intake→distillation→recovery→ At the end of filling, reset all internal switches and valve positions to the initial state, and finally enter the initial standby stage.

[0059] In the above embodiments, the preset time and liquid level reference values ​​can be multiple based on experience, and the specific values ​​are extremely important to the size, reaction characteristics, and production indicators of the high boiling tower, raffinate storage tank, and three distillation towers. .

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Abstract

The invention discloses a control method of sewage discharge and recovery for a high-boiling tower of vinyl chloride. A process, which includes interval time determination, sewage discharge, liquid feeding, distillation, recovery and filling and is frequently carried out in the high-boiling tower of vinyl chloride, and a manual determination operation are completed through DCS automatic control instead. An on-site auto-control valve, a pump auto-control start device and a third distillation column top recovery check valve are added to the system, and liquid level value and time are preset; when preset logic demand in each program step is satisfied, the method automatically enters the next program step. Meanwhile, according to demand of production, selection between step control and linkage, switching between manual operation and auto-operation, and starting, pause and stopping are carried out; when the program is finished, the internal switches and position of valves are reset to initial positions. Meanwhile, an operation control panel is added to the system in on-site operation. The control method can reach ideal control standard, is convenient to carry out, can overcome influences due to human factors, and achieves auto-control and optimization. The method can be widely applied to control methods for cleaning and alkali dosing of alkali washing columns in different chemical fields.

Description

technical field [0001] The invention relates to a control method for the production process operation of a vinyl chloride high boiling tower in the field of automation control, in particular to a control method for blowdown and recovery of a vinyl chloride high boiling tower. Background technique [0002] The crude vinyl chloride gas sent from the compression station is condensed by the total condenser, and the condensed liquid enters the vinyl chloride storage tank, and after removing part of the water, it enters the low boiling tower. The high boiling matter is removed from the tower, and then cooled by the finished product condenser to become a liquid refined monomer and then enters the monomer storage tank. After the tower is distilled, the monomers in it are recovered to the degassing cabinet, and the high boiling matter is pumped into the dichloroethane storage tank with a dichloroethane pump, and loaded into a car for sale. At present, the recovery and blowdown opera...

Claims

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Application Information

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IPC IPC(8): C07C17/38C07C21/06B01D3/42
CPCB01D3/42C07C17/38C07C21/06
Inventor 宋晓玲朱江军周红燕张良汤建辉程利锋
Owner TIANCHEN CHEM