火电厂DCS系统信号抗干扰研究及实例

摘要

For the problems of the poor combustion stability, low combustion efficiency and severely slagging in W flame boiler split burner, based on the analysis of combustion principle and the numerical simulation experiment, a new type split direct flow burner was designed. The exhaust gas fire nozzle was laid in two secondary air areas next to the furnace center. A secondary air nozzle was laid in a primary air nozzle next to water wall. The results show that new type split burner enhance the combustion stability and combustion efficiency of the boiler, and slagging can be effectively controlled.%为解决影响火电厂安全稳定运行的DCS(分散控制系统)信号干扰问题,分析了DCS的5类干扰来源:系统内扰、电源干扰、传导干扰、接地干扰、辐射干扰,提出6种抗干扰措施:隔离设备、选择电源、选择电缆、敷设电缆、有效滤波、正确接地.并以某电厂2×300 MW机组为例,系统分析了该机组汽包水位和汽包压力信号非正常波动的原因及解决方法.最后提出火电厂DCS系统抗干扰设计、施工及运行过程中应注意的3点要求,为电厂相关技术人员提供参考和借鉴.