内蒙古电力技术2023，Vol.41Issue(6)：26-34,9.DOI:10.19929/j.cnki.nmgdljs.2023.0081
燃煤锅炉SCR脱硝系统及其流场优化研究
Research on SCR Denitrification System and Its Flow Field Optimization for Coal-Fired Boilers
摘要
Abstract
In order to address the difficulty of precise ammonia injection in the Selective Catalytic Reduction(SCR)system during the transient process of coal-fired power units,the author optimizes the outlet flue guide plate and SCR top guide plate of the economizer of a coal-fired boiler based on numerical calculation results,establishes a controlled system and dynamic response model,and improves the model online using artificial intelligence algorithms to achieve precise ammonia injection.After the renovation,the flue gas flow rates on the A and B sides of the SCR inlet flue are 9.0 m/s and 9.2 m/s respectively,with relative standard deviation(CV)values of 11.4%and 10.7%.The average concentrations of NOx on the A and B sides of the SCR inlet flue are 250.7 mg/m3 and 260.5 mg/m3 respectively,with CV values of 4.8%and 5.0%.The average NOx on the A and B sides of the SCR outlet flue are 47.1 mg/m3 and 51.6 mg/m3 respectively,with CV values of 12.3%and 12.5%.These values meet the requirements of ultra-low emissions.The unit consumption of liquid ammonia decreases from 0.2783 kg per MWh before the renovation to 0.2152 kg per MWh,with a decrease of 27.8%.关键词
燃煤锅炉/SCR优化/精准喷氨/流场优化/脱硝系统Key words
coal-fired boiler/SCR optimization/precise ammonia injection/flow field optimization/denitrification system分类
信息技术与安全科学引用本文复制引用
王轶,张健,樊雄飞,顾超,何宝晶,李伟,李兵,伍力拓,杨浩,杨祖旺..燃煤锅炉SCR脱硝系统及其流场优化研究[J].内蒙古电力技术,2023,41(6):26-34,9.基金项目
青铜峡铝业发电有限责任公司科技项目"2号机组SCR脱硝系统智能测控及调平系统技术研究及应用"(QIOLED-JG-2022-08-29) （QIOLED-JG-2022-08-29）
