锅炉原煤仓自燃预警与惰化防火装置

Device of spontaneous combustion warning and fire protection for boiler coal bunker

原煤仓存煤自燃是电站锅炉安全运行的重要隐患,长时间以来缺少有效监测和控制手段。通过PLC模块对原煤仓仓壁敏感区域进行连续测温,辅以CO传感器和烟气感应器信号联合判断自燃趋势,避免了人工测量判断的主观误差的弊端。监测信号达到阈值时,自动控制电磁阀喷CO2灭火,实现全过程自动监测和灭火。对于未发生自燃的原煤仓也可自动定期进行气体惰化防火,降低存煤自燃概率,提高了整个系统的安全性。

Lack of effective monitoring and controlling methods makes coal bunker spontaneous combustion into a big risk facor for the power boiler safety operation in a long time.By continuously measuring coal bunker wall sensitive regions temperature,and assisted with CO sensor and gas sensor signals,the PLC module can accurately judge the spontaneous combusiton tendency,which avoids the disadvantages of the human subjective error.Once the monitoring signals reach a threshold,the PLC contorller automatically opens the solenoid valve to spray CO2 into coal bunker to extinguish fire,and the whole process realizes the automatic control.For unspontaneous combustion coal bunker,the device can also set program to conduct CO2 inert at fixed intervals,which reduces the probability of spontaneous combustion and improves the security of the whole system.