火电厂石子煤钢带输送系统的PLC控制实现

PLC Control Implementation of Steel Belt Coal Mill Rejects Conveying System in Thermal Power Plant

钢带输送机用于石子煤输送具有节能减排、节水环保及自动化程度高等优点,在石子煤量较大的电厂应用广泛.由于PLC具有抗干扰能力强、逻辑处理能力强、稳定性好等优点,常被选为电厂设备的控制器.以石子煤钢带输送系统的PLC自动化控制为研究对象,分析了工艺系统的组成,根据工艺系统I/O点需求,配置相应的PLC控制网络和硬件,通过分步实现各个子程序功能的方式进行PLC编程和调试,最后通过主程序将各个子程序进行整合,实现了系统的全自动化运行.

The steel belt conveyor is used for coal mill rejects transportation,which has the advantages of energy saving,emission reduction,water saving,environmental protection and high automation.It has been applied widely in power plants with large coal mill rejects.Because PLC has the advantages of strong anti-interference ability,strong logic processing ability and good stability,it is often selected as the controller of power plant equipment.Taking PLC automatic control of steel belt coal mill rejects conveying system as the research subject,the composition of the process system was analyzed;the corresponding PLC control network and hardware were configured according to the I/O point requirements of the process system;PLC was mainly programmed and debugged in a step-by-step manner to realize the functions of each subroutine.Finally,the system was fully automated by integrating the subroutines together with the main program.