摘要
针对PID调节的常规喷氨控制策略难以较好地解决由于大时延、外扰等因素造成的选择催化还原(Selective Catalytic Reduction,SCR)出口NOx浓度大幅波动的问题,设计了一套基于多模型动态矩阵的喷氨优化装置,利用动态矩阵控制算法提高喷氨调节速度以改善出口NOx浓度波动,通过设置多个动态矩阵控制器及加权输出环节提高了该装置的鲁棒性。最后,在某660 MW超临界机组上实现了该装置的整体应用。应用结果表明:各种工况下出口NOx浓度控制平稳,喷氨控制效果得到有效改善。
Since typical ammonia injection control strategy based on PID regulator cannot solve the unacceptable outlet NOx concentration fluctuation caused by the large time delay and external disturbance in the selective catalytic reduction flue gas denitration system,an ammonia injection optimization device based on multiple dynamic matrix control is developed.Based on dynamic matrix control,regulation rate of ammonia injection can be increased to improve control performance of outlet NOx concentration.Then multiple dynamic matrix controllers and their linear-weighting strategy are introduced to improve robustness of the control system.Finally,the device is applied to a 660 MW supercritical thermal power unit.The application result indicates that outlet NOx concentration of SCR can be stable and the control performance is clearly improved under all kinds of operating conditions.
作者
黄德胜
王忠凯
邓继军
张磊
HUANG De-sheng;WANG Zhong-kai;DENG Ji-jun;ZHANG Lei(Guodian Hunan Baoqing Coal Power Co.Ltd.,Shaoyang,422000,China;National Energy Investment Group Co.Ltd.,Beijing,100011,China)
出处
《热能动力工程》
CAS
CSCD
北大核心
2020年第6期280-286,共7页
Journal of Engineering for Thermal Energy and Power
关键词
选择催化还原
大时延
外扰
多模型动态矩阵
加权输出
出口NO_x浓度
selective catalytic reduction
large time delay
external disturbance
multiple dynamic matrix control
linear-weighting strategy
outlet NOx concentration
