陶瓷膜中试流程控制系统开发

Development of Control System for Ceramic Membrane Pilotscale Experiment

摘要:

为了满足新型陶瓷膜中试流程各操作参数处于最优值,在分析陶瓷膜中试流程结构与工作原理的基础上,分别对控制系统总体方案和系统软硬件展开设计；提出采用三回路专家PID控制算法,实现对压差、流量的精确控制；系统由PLC为控制器,触摸屏为上位机,压力变送器、流量变送器及温度变送器为反馈单元,电动调节阀为执行机构等部分组成；运行结果显示,对进料泵出口流量、循环泵出口流量跟踪控制时,误差在5%内,对陶瓷膜回路进出口模拟差压跟踪控制时,误差在3.3%内,表明系统控制精度高,且鲁棒性好。

Abstract:

In order to obtain the optimal values of the operating parameters of the new ceramic membrane, on the basis of analysis of the structure and working principle of the ceramic membrane, the overall plan of the control system and the hardware subsystem and software subsystem are designed severally. A method was presented to achieve accurate control of differential pressure and flow through three loop expert PID control algorithm. Control system was designed with PLC for main controller, touch screen as the upper computer, pressure transmitter, flow transmitter and temperature transmitter for feedback device and electricity-controlled ratio valve for actuator. Running results show that when the value of the feed liquid pump outlet flow and circulation pump outlet flow are set, tracking error is within 5%, when the simulated import and export differential pressure value of ceramic membrane loop is set, tracking error is in 3.3%, and the system has the virtue of high control precision and good robustness.