摘要
针对垃圾焚烧锅炉半干法脱酸系统自动控制投运率低、控制效果差的问题,在分析脱酸系统运行特性的基础上,设计了一种以PID控制和模型预测前馈相结合的HCl-SO_(2)协同控制策略。采用以HCl排放浓度作为主要控制目标,SO_(2)排放浓度作为次要目标的串级PID协同控制策略。在串级PID控制的基础上,基于时间差分偏最小二乘法(TD—PLS)建立HCl排放浓度预测模型作为控制前馈。该控制策略应用于某500 t/d垃圾焚烧机组脱酸系统,实际应用效果表明:脱酸控制投入前,HCl排放浓度波动变化较大,小时排放均值范围20~40 mg/m^(3),小时排放均值浓度相对标准偏差(RSD)为15.95%。脱酸自动控制投入后,HCl小时排放均值范围在25~30 mg/m^(3),小时排放均值浓度RSD为6.22%。在协同控制作用下,HCl小时排放均值波动显著减小,单位锅炉蒸发量的石灰浆液消耗量由0.034 m^(3)/t降低到0.027 m^(3)/t,相比投运前降低了21%,在保证出口HCl和SO_(2)浓度符合标准的情况下,提高了脱酸系统运行的稳定性和经济性。
The automatic control of the semi-dry de-acidification system in the waste incinerators has the problems of a low operation rate and poor control effect.In this paper,a cooperative HCl-SO_(2) control strategy combining PID control and model prediction feedforward is designed based on the analysis of the operating characteristics of the de-acidification system.A cascade PID cooperative control strategy with HCl emission concentration as the primary control objective and SO_(2) emission concentration as the secondary objective is proposed.Then,an HCl emission concentration prediction model based on time difference-partial least squares(TD-PLS)was developed as a control feedforward.This control strategy was applied to the de-acidification system of a 500 t/d waste incineration,and the actual application effect shows that:before the control strategy was implemented,the HCl emission concentration fluctuated greatly,the hourly emission average value varied in the range of 20-40 mg/m^(3),and the hourly emission average concentration relative standard deviation(RSD)was 15.95%.After the control strategy was implemented,the average hourly HCl emission varied from 25 mg/m^(3) to 30 mg/m^(3),and the RSD of the average hourly emission concentration was 6.22%.Under the coordinated control,the hourly HCl emission means value fluctuation was significantly reduced,and the lime slurry consumption per unit of boiler evaporation was reduced from 0.034 m^(3)/t to 0.027 m^(3)/t,which was 21%lower than before.A stable and economical operation of the waste incinerator de-acidification system was achieved while the outlet HCl and SO_(2) concentrations meet the standards.
作者
李志东
陈达
刘学迅
张燕星
易刚
叶育生
刘岸青
李文鹏
王领
姚顺春
LI Zhidong;CHEN Da;LIU Xuexun;ZHANG Yanxing;YI Gang;YE Yusheng;LIU Anqing;LI Wenpeng;WANG Ling;YAO Shunchun(Guangzhou Huantou Conghua Environmental Protection Energy Co.,Ltd.,Guangzhou 510900,China;School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,China)
出处
《锅炉技术》
北大核心
2024年第1期23-28,49,共7页
Boiler Technology
基金
国家重点研发计划政府间国际科技创新合作项目(2019YFE0109700)。
关键词
垃圾焚烧锅炉
半干法脱酸
自动控制
关键变量模型前馈
协同控制
waste incinerator
semi-dry deacidification
automatic control
key variable model feedfoward
coordinated control
作者简介
李志东(1978-),男,高级工程师,主要从事工业控制及脱酸方面工作。E-mail:lizhidong@gzepi.com.cn。
