电热锅炉温度-液位双回路控制系统

以PLC 作控制器，结合温度变送器、液位变送器以及晶闸管和变频器等执行元件，组成电热锅炉温度-液位双回路控制系统，详细介绍了控制系统的构成原理、硬件配置和软件控制流程。系统中的PID 调节功能用PLC 集成的PID 指令实现。在实验室进行了系统
调试，收到了比较满意的控制效果。系统安全、可靠、易于实现、维修方便。
关键词：PLC；电热锅炉；PID；双回路控制
Double-loop control system of electrothermal boiler’ s temperature and level
REN JUNJIE LI HONGXING LI YONGXIA ZHANG YINONG (Beijing Union University，Beijing，China) Abstract: Based on PLC, combined with temperature transmitter, level transmitter, thyristor and frequency converter, a double-loop control system of electrothermal boiler’ s temperature and level is composed。The structure and control principle are introduced in details. The hardware configuration and software control flowchart are also described. The PID function is achieved with the PID instruction integrated in PLC. The system is debugged in the laboratory and a satisfactory control can be received.
Key words： PLC Eectrothermal boiler PID Double-loop control