燃煤电站锅炉二次风控制系统优化

The Optimizing Control of the Secondary Air Control System of Power Plant

针对二次风控制系统中的风煤比优化问题进行研究。首先,以锅炉热平衡原理为基础,分析了过量空气系数、飞灰含碳量及排烟温度对锅炉效率的影响,建立了热经济性参数在烟气含氧量影响下的计算模型和以锅炉效率为目标的最佳烟气含氧量数学模型。其次,对于二次风控制系统,提出了用Smith模糊PID控制器替换传统的PID控制器的控制方法。最后,通过实验仿真比较两种控制器在被控对象模型匹配和不匹配情况下的控制性能。

The paper addresses the wind coal ratio optimization problem for secondary air control system. Firstly, on the basis of the basic theory of boiler thermal balance, this paper explains the effects of excess air coefficient, unburned carbon content in fly ash and boiler＇s exhaust gas temperature on boiler efficiency, and establishes the mathematical model of boiler＇s thermal economy parameters affected by the flue gas oxygen content and partial differential equation of the optimal oxygen content in flue gas aiming to improve boiler efficiency. Then, for the second air control system, a control approach is proposed by Smith fuzzy PID instead of the traditional PID. Further, control performances are compared between two different controllers under the model is matching and ~matching via simulation experiments.