聚氯乙烯气流干燥过程的仿真研究

Simulation Study on Drying Process of Polyvinyl Chloride

以聚氯乙烯湿物料为例,应用Aspen plus软件,将聚氯乙烯湿物料与空气在气流干燥塔和旋风干燥器中进行传质传热,生产合格的聚氯乙烯,平均直径为101.55μm,含水量为2.53 g/kg,能耗为2664.45 kW。通过灵敏度分析确定泵的压力对气流干燥过程有很大影响。针对传统聚氯乙烯气流干燥控制系统存在的问题,通过MATLAB仿真建立以压力为变量对压力泵进行调节的闭环压力控制系方案,对PID控制、模糊控制和模糊PID控制的控制结果进行对比,得出模糊PID控制系统具有良好的性能,适合在聚氯乙烯气流干燥控制过程中推广。

Taking polyvinyl chloride(PVC)wet materials as an example,the Aspen plus software was used to carry out mass transfer and heat transfer of PVC wet materials and air in a gas drying tower and a cyclone dryer to produce qualified PVC.The qualified PVC was produced with an average diameter of 101.55μm,water content of 2.53 g/kg and energy consumption of 2664.45 kW.Sensitivity analysis determines that the pump pressure has a large effect on the airflow drying process.Aiming at the problems existing in the traditional PVC airflow drying control system,the closed-loop pressure control system with pressure as the variable to adjust the pressure pump is established by MATLAB simulation,and the control results of PID control,fuzzy control and fuzzy PID control were compared.The results show that the fuzzy PID control system has good performance and is suitable for promotion in the process of PVC airflow drying control.