DCS control method for acid production process in hydrogen chloride production

Abstract

The invention relates to a DCS control method of an acid making process in hydrogen chloride production. In hydrogen chloride production, hydrogen chloride gas produced by a synthetic furnace is guided out via a hydrogen chloride outlet from the bottom of a cooler of the synthetic furnace and then enters a hydrogen chloride distribution table, a DCS control approach is adopted for an acid making process based on hydrogen chloride, and a one-key acid making start button is set on a display device of an hydrogen chloride DCS control system operator station. The invention provides a DCS control method of a one-key automatic acid making process in hydrogen chloride production. The method has the advantages of simple operation, high degree of automation, high safety coefficient, and good stability. Automatic control of an acid making process based on hydrogen chloride is truly realized. The labor intensity and the production cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical automation control, in particular to a DCS control method for an acid production 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 relatively low. pneumatic control valve). The existing technology has the following defects: First, the adjustment of the furnace pressure of the synthesis furnace is not timely, resulting in an imbal...

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. The chlorine content in the tail gas tower exceeds the standard, and the absorption is incomplete, which will cause air pollution; 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 main pipe of the hydrogen chloride synthesis, which is very easy. Explosion accidents occurred; third, the degree of automation of the hydrogen chloride acid production process is relatively backward, the labor intensity is high, the accident rate is high, 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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