工业锅炉的燃烧控制策略研究与应用

Combustion control strategy for industrial boilers

采用PID控制难以实现工业锅炉燃烧有效控制。在分析工业锅炉燃烧过程的动态特性的基础上提出新的控制策略。针对蒸汽压力控制存在的有自衡过程与无自衡过程,分别采用三阶最佳工程设计方法设计多个控制器,根据蒸汽流量出现的扰动,以及给煤量的变化情况,通过切换选择不同的控制器,从而实现蒸汽压力的有效控制。通过测量烟气含氧量和炉膛温度来准确地判断燃烧情况,同时根据热效率与风/煤比之间的特性,利用专家经验自动寻找最佳风/煤比,从而保证完全燃烧。实际运行效果表明该控制策略适用于一般工业锅炉控制。

It which a new vapor pressure designed with disturbance of pressure. The temperature of based on its boilers. is difficult to effectively control the combustion process of industrial boiler by PID,for control strategy is presented based on the analysis of its dynamic characteristics. For the control has both automatic and non-automatic balancing processes,several controllers are the third-order optimal engineering method,one of which is selected according to the vapor flow and the variation of coal feeding to realize the effective control of vapor combustion condition can be accurately determined by the O2 content in flue-gas and the furnace. The expert system is used to find the best wind-coal ratio for complete burning thermal efficiency characteristic. Practical operation shows it is applicable to industrial