燃煤锅炉炉内能量监测方法

Monitoring methods of radiative energy signal in a coal-fired boiler

基于火焰检测系统和图像处理技术,直接由火焰辐射图像的灰度值计算辐射能信号,提出一种以机组功率为基准对辐射能信号进行动态补偿的构建方法.该方法获取的辐射能信号不受测量条件的影响,具有较高的准确性,其值与机组功率具有相同的量程范围,减小两者的差异是当前炉内燃烧调整的方向.在一亚临界燃煤锅炉进行了辐射能信号准确性的动态验证试验,结果发现:该方法构建的辐射能信号较机组原系统中的热量信号更快速、准确地反映出炉内燃烧率的变化,并在此基础上讨论了辐射能信号应用于锅炉燃烧及机组协调优化控制的可行性.

A systematic method to construct the RES（radiative energy signal）was proposed based on flame monitoring system and image processing techniques.The value of RES was directly calculated from the image gray scale and then dynamically modified by the load.In this method,the RES has high accuracy and it can calibrate the signal of monitoring system covered by slag and/or soot deposit.Its value and power units have the same scale range,and decrease the difference between the RES and the measured power output is the foundation of combustion adjusting.A verification experiment was carried out in subcritical coal-fired boiler.The results show that RES constructed by this method is more rapid and accurate than the heat value signal.On this basis,the application potential of RES to improve the boiler-turbine control systems was also discussed.