分布式燃气热水供热PLC控制系统

摘要

分布式燃气热水供热系统具有灵活、经济、环保等特点.将自动化技术、控制技术和现场总线通信技术应用于分布式燃气热水供热系统,可以提高供热质量、节约能源.介绍了S7-1200系列PLC应用于分布式燃气热水供热系统的实现技术.阐述了控制系统结构、测控点设计、PLC硬件配置、控制器与变频器和室温传感器等智能设备通信连接.重点讨论了供热系统供水温度室外温度补偿质调节控制模型、室温反馈修正的质调节控制模型,以及供暖供水温度控制、供热循环泵压差变频控制、定压补水控制和供水管道泄压控制策略.根据确定的控制策略,设计了PLC供暖系统控制程序.实际运行表明,该控制系统运行稳定、操作智能简便,保证了供热质量,节约了能源,降低了供热运行成本,具有广泛的应用前景.%Distributed gas hot water heating system has the characteristics of flexibility,economy and environmental protection. Combining automation technology,control technology and fieldbus communication technology into the distributed gas hot water heating control system will improve the heating quality and save energy. The application of S7-1200 series PLC in the distributed gas hot water heating system was introduced. the communication connection between the controller,and the frequency converter and the temperature sensor are described. The structure of the control system,the design of measurement and control points, the hardware configuration of PLC,the heating system water temperature of the outdoor temperature compensation quality adjustment control model,and temperature feedback correction quality adjustment control model,heating water temperature control,heating circulating pump pressure frequency control,constant pressure water control and water supply pipeline pressure control strategy were mainly discussed. According to the control strategy,the PLC heating system control program was designed .The actual operation shows that the control system is stable,the operation is Intelligence and convenient,the heating quality is ensured,the energy is saved,and the heating operation cost is reduced,and the utility model has wide application prospects.