基于现场数据的中速磨煤机动态建模研究

A Study of the Dynamic Modeling of a Medium Speed Pulverizer Based on On-site Data

基于现场数据 ,结合电厂磨煤机系统的工作原理 ,通过对其控制系统分析 ,建立了磨煤机出口温度和磨煤机入口空气流量的状态空间动态数学模型。在不同的变工况过程中 ,以磨煤机冷风门和热风门开度为输入 ,所建立的磨煤机出口温度和入口空气流量的动态模型精确度较高 ,比较真实地反映了磨煤机的实际运行状况。由于系统本身具有强耦合性 。

On the basis of on-site data and in conjunction with the working principle of a power plant coal-pulverizer system a state-space dynamic mathematical model has been set up of the coal pulverizer outlet temperature and pulverizer inlet-air flow rate through an analysis of the coal pulverizer control system. During the process of various off-design operating conditions with the coal-pulverizer cold air port and hot air port opening degree serving as an input a dynamic model was built for the coal-pulverizer outlet temperature and inlet air flow rate. This dynamic model features relatively high precision and can quite truly reflect the actual operating condition of the coal pulverizer. Due to a strong coupling effect of the system itself the created coal pulverizer model can lay a good foundation for the optimized configuration of the control system and for enhancing the quality of control.