低温等离子体处理VOCs的控制系统设计

Design of control system for low temperature plasma treatment of VOCs

为解决低温等离子体处理VOCs容易爆炸、低温等离子体状态不能直接检测等问题,设计了一种基于S7-1200PLC的废气处理装置控制系统,并给出具体的工艺流程、控制系统总体结构及硬软件设计。该系统利用MCGS软件开发上位机管理界面,既能实现远程监控与管理的目的,又能通过预测模型控制算法间接预测低温等离子体的状态能量并把数据传给下位机。下位机由S7-1200PLC实现回流防爆、VOCs含量达标的控制。在MATLAB仿真下,上位机预测模型控制算法最大误差为5.57%,最小误差为0.07%,具有较好的预测效果。该系统在处理VOCs过程中的安全性和稳定性较高,具有良好的应用前景。

In order to solve the problems that low temperature plasma treatment VOCs are easy to explode and low temperature plasma state cannot be directly detected,a control system of exhaust gas treatment device based on S7-1200 PLC is designed,and the specific process flow chart,overall structure of control system and hardware and software design are given.The system uses MCGS software to develop the upper computer management interface,which can not only achieve the purpose of remote monitoring and management,but also indirectly predict the state energy of the low temperature plasma and transmit the data to the lower computer through the predictive model control algorithm.The lower machine is controlled by S7-1200 PLC for reflux explosion protection and VOCs content compliance.Under MATLAB simulation,the maximum error of the host computer predictive model control algorithm is 4.57%,and the minimum error is 0.07%,which has a good prediction effect.The system has high security and stability in the process of processing VOCs and has a good application prospect.