采用辐射能信号的电站锅炉燃料调节对象建模及控制仿真研究

Model Establishment of Fuel Controlled Objective in Utility Boilers Based on Signal of Radiative Energy from Furnaces and Simulation on Its Control

针对目前电站锅炉燃料调节对象基本上采用蒸汽参数进行控制的特点，本文采用全炉膛看火电视装置加上计算机图象采集与处理系统获取代表炉内辐射能水平的火焰辐射图象，将其平均灰度值作为中间被调量，与蒸汽压力一起，建立电站锅炉燃料调节对象的数学模型，并通过现场测试，初步确定了模型的参数。在此基础上．构成一种将火焰辐射图象的平均灰度值作为中间被调量的串级燃料控制系统，仿真研究表明该系统能有效地克服燃料侧内扰对蒸汽压力的影响，提高燃烧控制的效率。

In view of the features of the existing fuel control systems of utility boilers by steam parameters in general, a full furnace flame TV equipment and a computer image capturing and processing system are adopted to capture the flame radiative images representative of the radiative energy level in furnaces. The average grey-scale of the images is taken as an intermediate controlled parameter, and together with the steam pressure parameter, a new model of the fuel controlled objective is established for utility boilers. Through in-situ measurement, the parameters of the model are determined preliminarally. Based on this model, a two loop fuel control system,which takes the average grey-scale of the flame radiative images as an intermediate controlled parameter, is set up.Simulation results show that this control system can overcome efficiently the influence of the fuel disturbance on the steam pressure, and the efficiency of combustion control will be improved.