基于智能前馈的垃圾焚烧炉脱硝控制策略  

Denitration control strategy for waste incinerator based on intelligent feedforward

作　　者：刘学迅 李峥辉 李志东 易刚 叶育生 张燕星 吴康洛 卢志民[3] 俞祝良[2] 姚顺春[3] LIU Xuexun;LI Zhenghui;LI Zhidong;YI Gang;YE Yusheng;ZHANG Yanxing;WU Kangluo;LU Zhimin;YU Zhuliang;YAO Shunchun(Guangzhou Huantou Conghua Environmental Protection Energy Co.,Ltd.,Guangzhou 510900,China;School of Automation Science and Engineering,South China University of Technology,Guangzhou 510641,China;School of Power,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]广州环投从化环保能源有限公司,广东广州510900 [2]华南理工大学自动化科学与工程学院,广东广州510641 [3]华南理工大学电力学院,广东广州510641

出　　处：《热力发电》2022年第4期112-119,共8页Thermal Power Generation

基　　金：国家重点研发计划政府间国际科技创新合作项目(2019YFE0109700);广东省自然科学基金-杰出青年项目(2021B1515020071)。

摘　　要：针对选择性非催化还原(SNCR)脱硝控制系统大迟延、大惯性的特点,以及垃圾特性不稳定和燃烧状态波动大导致的脱硝控制稳定性差的问题,设计了一套基于智能前馈的垃圾焚烧炉脱硝控制策略。该控制策略以串级PID控制为基础,采用基于偏最小二乘法(PLS)的模型预测前馈和关键变量前馈相结合的智能前馈结构,同时采用模型预测误差自修正方法以保证模型预测的精度和稳定性。将该脱硝智能控制策略应用于某500 t/d垃圾焚烧机组,应用结果表明:脱硝智能控制投入前,NO_(x)排放质量浓度波动较大,统计时间内NO_(x)质量浓度相对标准偏差为19.81%,其中瞬时NO_(x)排放质量浓度小于150 mg/m^(3)的占比为95.62%;脱硝智能控制投入后,NO_(x)排放质量浓度波动显著减小,统计时间内NO_(x)质量浓度相对标准偏差为12.40%,其中瞬时NO_(x)排放质量浓度小于150 mg/m^(3)的占比为99.31%,控制稳定性显著提高,统计时间内日均进氨流量和日均进氨总量较智能控制投入前分别下降38.81%和38.82%,实现了垃圾焚烧炉SNCR脱硝系统的稳定、经济和环保运行。The selective non-catalytic reduction(SNCR)denitrification system in waste incinerator unit has the characteristics of large delay and large inertia,and poor stability of denitration control caused by complex changes in characteristics and composition of waste as well as large fluctuation of combustion conditions.To solve these problems,automatic control strategy of the SNCR denitrification system based on intelligent feedforward is designed.Based on the cascade PID control,this control strategy adopts the intelligent feedforward structure which combines the model prediction feedforward based on partial least squares(PLS)with the key variable feedforward,and uses the model prediction error self-correction method to ensure the accuracy and stability of model prediction.The control strategy is applied to a 500 t/d waste incineration unit,and the application results show that,before the intelligent denitrification control system was put into service,the fluctuation of NO_(x)emission mass concentration was large.The relative standard deviation(RSD)of NO_(x)mass concentration within the statistics period was 19.81%,and the proportion of the instantaneous NO_(x)emission mass concentration less than 150 mg/m^(3) was 95.62%.After the intelligent denitrification control system was put into service,the RSD of NO_(x)mass concentration within the statistics period was 12.40%,and the proportion of the instantaneous NO_(x)emission mass concentration less than 150 mg/m^(3) was 99.31%.The fluctuation of NO_(x)emission mass concentration reduced significantly,and the control stability was significantly improved.The average daily ammonia intake flow rate and the average total ammonia intake decreased by 38.81% and 38.82% in the statistical time,indicating the stable,economic and environmental protection operation of the SNCR denitrification system in waste incinerator were realized.

关 键 词：垃圾焚烧炉 SNCR 脱硝控制 控制策略 串级PID控制 智能前馈 

分 类 号：TK323[动力工程及工程热物理—热能工程] TP273[自动化与计算机技术—检测技术与自动化装置]