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NO〖HT5”〗x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NO〖HT5”〗x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NO〖HT5”〗x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.

TM621

广东省质量技术监督局科技项目（2018CT30）