Research On Pvc Polymerizer Temperature Control Based On Predictive Fuzzy PID Control

Petrochemical industry is a leading industry of our national economics, as a kind of chemical products, polyvinyl chloride (PVC) is the largest production and consumption of plastic product in the world. PVC polymerization plays a very important role in industrial production, the reaction temperature,container pressure,medium flow,medium velocity all have effects on the polymerization reaction, in which the greatest influence on product quality is the temperature. Therefore, control precisely to temperature of PVC polymerization is very essential.The polymerization reaction's mechanism is very complex, there is strong nonlinearity, large inertia and delay and other characteristics in this process, model parameters are time-varying, depending on the accurate mathematical model of the controlled object-one kind of traditional control methods can not achieve satisfactoring control effect. So, seeking an efficient control method to enhance the effection of polymerization's temperature control is necessary.Model predictive control and fuzzy control are all less precision to the controlled object model, MPC have some characteristices such as strong robustness, can eliminate the system static error, at the same time the fuzzy control have strong online adjustment, real-time well, can enhance the system anti-jamming capability. So in the link of the polymerization reactor's jacket cooling system, combined with predictive control and fuzzy control technology, design a predictive fuzzy controller to further enhance the control effect.This paper outlines the process of PVC production and related processes, based on in-depth analysis of polymerization dynamics, combined with Model Predictive Control and the fuzzy control technology, presents a corresponding control algorithm, and design a predictive fuzzy PID controller, theoretical analysis and simulation results shows: this control strategy has small overshoot,response rapidly, it is a effective method to improve the effection of temperature control of polyvinyl chloride reactor.