An Optimalized Computer Control System of Polyvinyl Chloride Polymerized (PVC) Reactor

Abstract Basic principles and system constitution as well as functions and industry effeciency of an optimal control system with a SDS-1 microcomputer are presented, in which a PVC enamel reactor is controlled using model reference adaptive prediction strategy. Interlock and start up between different stages of PVC process (including quantity measurement, temperature elevation, temperature stabilization and pressure reduction) are performed automatically by corresponding control programs. The mathematical model is established by statistical regression and heater equilibrium analyses with characteristic parameters of the process and regulating parameters got through computer simulation, making a good remedy to the affection on the control quality of the control system by nonlinearity, unstability as well as time varying and dead time of the object. Using the control system, temperature of the PVC reactor waves within the interval of The sequencial control and closed-loop control of the whole production process which consists of stages including measurement, feed-in, cool-stir, elevation of temperature, transition, temperature regulation and reduction of pressure etc. Fig.1 is realized by the control system by possesing distributed control and centralized monitoring. Additionally, functions like CRT display monitoring, parameter modification, judging and warning of the first failure, print of data and curves, process display, manual and automatic activities and remote-controlled non-interference alternation etc. are installed. The technical materials and constitutional devices of the system are ready to supply to factories and corporations as a completed technology if needed.