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Design of Sequential Control System for Continuous Chemical Reaction Process Based on PCS7

Taking the common continuous chemical reaction process in industry as the research object, this paper analyzes the function of instruments and equipment, system process flow and sequence control requirements of each part of chemical reaction process. Combined with the object control circuit and operation experience, taking safety, stability and energy saving as the production goal, the start-up and stop sequence control system of chemical reaction process is designed, and the flow chart is given. Based on SIMATIC PCS7 control platform and SMPT-1000 as an object, the experiment was carried out. The experimental results show that the operation of the system is stable and the performance indexes are controlled within the requirements of safe and efficient operation of the system, i.e. the flow of final product, product concentration, reactor temperature, reactor liquid level, flash tank pressure, flash tank liquid level, mixing tank liquid level and preheater temperature are all kept within the safe production range, which can meet the requirements of sequence control of chemical reaction process.