DCS control method for gas supply process in hydrogen chloride production

Abstract

The invention relates to a DCS control method for a gas supply process in hydrogen chloride production. In hydrogen chloride production, hydrogen chloride gas produced in a synthetic furnace is exported from the bottom of a cooler of the synthetic furnace through a hydrogen chloride outlet pipe, and enters a hydrogen chloride distributing table, the hydrogen chloride gas supply process adopts a DCS control mode, and a one-key gas supply start button is arranged on a display device of hydrogen chloride DCS control system operator station. The invention provides the DCS control method for one-key completion of the gas supply process in the hydrogen chloride production, and the method is simple and convenient to operate, high in degree of automation and safety factor, and good in stability, thereby truly realizing automated control of the hydrogen chloride gas supply process, the labor intensity is reduced, and the production cost is also reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical automation control, in particular to a DCS control method for the gas delivery process in hydrogen chloride production. Background technique [0002] In the production of polyvinyl chloride, the chlorine and hydrogen after hydrogen chloride treatment are burned in the graphite synthesis furnace, and the hydrogen chloride gas generated is cooled and sent to the vinyl chloride workshop. Falling film absorption system, the process is commonly known as acid production or modified absorption. Dangerous gases such as hydrogen, chlorine, and hydrogen chloride are involved in the production process of the hydrogen chloride synthesis process. The degree of automation in the traditional production mode is low, and the gas supply operation has gone through on-site pure manual (the operating valve is a manual control valve)-remote manual (the operating valve is pneumatic Control valve). The existing techno...

AI Technical Summary

Problems solved by technology

The existing technology has the following defects: First, the adjustment of the furnace pressure of the synthesis furnace is not timely, resulting in an imbalance in the proportion of hydrogen and chlorine gas entering the furnace. If the hydrogen gas is excessive during gas supply, the conversion rate of the subsequent section will be affected, and even an explosive gas mixture will be formed after exceeding the standard seriously, which will affect the equipment. Safety; if the chlorine gas is excessive during gas supply and the free chlorine exceeds the standard, it will inevitably affect the production safety of the vinyl chloride synthesis section; second, the hydrogen chloride gas in the main pipe is higher than the furnace pressure, causing the hydrogen chloride gas in the main pipe to return to the synthesis furnace and the absorption tower, and even the acetylene gas is reversed to the The supervisor of synthetic hydrogen chloride is prone to explosion accidents; third, the degree of automation of the hydrogen chloride gas supply process is relatively backward, with high labor intensity and high accident rate, and production accidents caused by improper operation of workers occur from time to time

[0005] Although the technologies discussed in the above two papers have added automatic control transformation, DCS personnel still need to manually adjust the control parameters, and the disadvantages mentioned above still exist

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