Simulation Study On Temperature Control Of Distillation Column Based On Fuzzy Decoupling

Rectification control process plays an important role in the areas of production of Petroleum, Chemical and Pharmaceutical. Distillation process takes up one third of the energy consumption, and the improvement of its control method could significantly improve the efficiency of industrial production. Due to the crisis of the global energy, the development and investment of new separation technology and equipment to reduce energy consumption become inevitable trend in chemical industry. How to improve distillation process, control accuracy and economic efficiency have become popular problems in the research of distillation column control system.Propylene fractionator distillation process is a very complex control process, while the control of distillation temperature directly affects the yield and quality of propylene. On the basis of PID control, conventional distillation column temperature control would ignore the coupling between the loops.Due to the characteristics (large factors, strong coupling, large delay and nonlinear) of the process for the distillation column control, fuzzy decoupling controller is designed in order to control the temperature of the tower, which is based on the coupling of propylene tower and the tower kettle temperature. According to the contrast with traditional decoupling control, it could be confirmed that this method will obtain a nice effect.This paper will describe the current research status, as well as the common control scheme distillation column distillation column. Besides, the control characteristics of various control schemes and research status decoupling control will be compared. Moreover, it will introduce the principles of rectification and distillation process of propylene and propylene distillation column control system disturbance factors. According to the establishment of a mathematical model for propylene tower, it would establish a foundation for the next research of scheme control design. By learning the theory and research of fuzzy decoupling control, combined with a certain energy of ethylene propylene production unit which controls the process of distillation in one chemical company in Yulin, distillation column at both ends of the impact of the distillation column temperature control circuit components will be analyzed, and the paper will focus on the coupling phenomena between them. At last, according to the actual production, a fuzzy decoupling controller dual input dual output would be designed, which will be compared with the traditional decoupling in Matlab/ Simulink environment simulation. By the emulation comparison, fuzzy decoupling could be controlled on response speed, while the effect of control that acquired on steady-state error, which has good robustness and adaptability, will be better than it on overshoot conventional feed forward decoupling control.