煤炭转化2025，Vol.48Issue(5)：13-24,12.DOI:10.19726/j.cnki.ebcc.202505002
基于水侧调控的超临界锅炉宽负荷SCR入口烟温控制研究
Investigation on the improvement of flue gas temperature in the inlet of SCR reactor within wide load range for supercritical coal-fired boiler based on water-side regulation method
摘要
Abstract
The flue gas temperature at the exit of the economizer during low load operation of thermal power units often deviates from the temperature window of SCR denitrification,leading to a series of issues such as reduced denitrification efficiency.This phenomenon is commonly observed in current coal-fired power plants.In this research,a full-flow model of a 350 MW supercritical coal-fired boiler applicable to 20%-50%deep peaking conditions was established based on Aspen plus,and the model was validated using field test data.Based on this model,three water-side regulation techniques for wide-load denitrification efficiency improvement were studied:feedwater bypass,hot water recirculation,and composite hot water recirculation.The effects of each technique on the increase in inlet flue gas temperature to the SCR denitrification device were analyzed.The results show that under the composite hot water recirculation scheme,the maximum temperature rise of the flue gas at the inlet of the SCR denitrification device reaches 33.5℃(20%THA)and 35.4℃(30%THA)in wet-mode operation and 28.6℃(50%THA)in dry-mode operation,respectively,demon-strating a significantly better temperature enhancement effect compared to the other two water-side regulation techniques.At a 20%THA load condition,the flue gas temperature at the inlet of the SCR denitrification device increases to 323.3℃when the share of composite hot water recirculation reaches 80%.Among the three water-side control schemes,the composite hot water recirculation scheme can ensure the safe and stable operation of the SCR denitrification system under the boiler's 20%-50%deep peaking regulation,and is significant for the control of low load NOx emission.关键词
SCR脱硝/烟温/水侧调控/流程模拟/超临界锅炉Key words
KEYWOEDS SCR denitrification/flue gas temperature/water-side regulation/process simu-lation/supercritical boiler分类
资源环境引用本文复制引用
田永丰,张鹏威,刘梁,何建乐,金燕,黄中,吕俊复,柯希玮..基于水侧调控的超临界锅炉宽负荷SCR入口烟温控制研究[J].煤炭转化,2025,48(5):13-24,12.基金项目
"十四五"国家重点研发计划项目(2022YFB4100805). （2022YFB4100805）
