基于DMC-PID的循环流化床锅炉床层温度控制设计与实现

Control Design and Realization for Bed Temperature in Circulating Fluidized Bed Boiler Based on DMC-PID

首先分析了循环流化床锅炉燃烧部分床层温度多种影响因素,得到在各严重耦合关系影响因素下床层温度变化过程难以建立一个准确的数学模型来描述。针对此特点,设计采用蒸汽负荷作为前馈信号的床层温度-燃料量串级控制方案。其中床层温度控制器采用动态矩阵算法,具体地给出可实现的动态矩阵控制算法过程。介绍了VC通过OPC接口技术与DCS控制系统进行数据交换,实现了VC环境下的DMC-PID控制算法在循环流化床锅炉床层温度中的成功应用,并证明了该算法的实用性、有效性和可靠性。

A variety of factors that were critical for the bed temperature in the circulating fluidized bed boiler were analized, and has reached an important conclusion that the process of bed temperature is complicated and has various influencing factors. So it is difficult to establish an accurate mathematical model for bed temperature. For this characteristic,the bed temperature- fuel cascade control program was designed that uses the steam load as feedforward signal. In this design, dynamic matrix algorithm was used in bed temperature controller, and concrete realization of the process of dynamic matrix control algorithm was given. The data exchange through the OPC interface and DCS by VC was achieved , and had successful bed temperature application in the circulating fluidized bed boiler. The result proves that the algorithm is practical, effective and reliable.