The Research Of Optimizing Control Of VCM Production Process

Vinyl chloride monomer (VCM) is the main material of PVC produce. The produce process of VCM has complicated mechanism, it is nonlinear, uncertainty and time-varying, so it has typical character of a series of complex chemical reaction process. Currently, the automation level of VCM production is very low in China, most of device is in a manual or semi-automatic control, and most of research of VCM production technique focus on production technology, it has not been combined effectively with research of control. How to improve the level of control and optimize the production process have become the important methods of improving production efficiency and product quality.Based on understanding and analyzing the mechanics of VCM production process and production flow, according to the request of technology and control, the production process optimization solution and the project of the integrated control system of VCM production process are proposed. In this project, the 3-layer distributed control system is presented by assembling PLC, industrial PC, field bus I/O modules and the industrial Ethernet. Aimed at the "gas-tank" problem in acetylene station, the PFC-PID cascade control solution is designed. Aimed at the problems of building up model and controlling translation temperature difficulty, a modeling method of nonlinear systems using support vector machines is proposed. And the modeling of SVM is applied to nonlinear predictive control. A kind of nonlinear predictive control scheme based on the SVM model is gave out. Finally, the human machine interface of VCM production is designed based on Rsview32.The results of simulation show that the advanced control solutions have good control quality, it could revolved successfully the control problems of VCM production process, realize the purpose of improving produce quality, reducing consume and improving production efficiency.