电力科技与环保2026，Vol.42Issue(2)：223-233,11.DOI:10.19944/j.eptep.1674-8069.2026.02.005
低负荷下循环流化床全炉膛脱硝数值模拟研究
Numerical simulation of full-furnace denitration in a circulating fluidized bed under low-load conditions
摘要
Abstract
[Objective]At low load,the circulating fluidized bed has the problem of low denitration efficiency in the furnace.In order to solve this problem,it is necessary to study the law of ammonia injection and denitrification in circulating fluidized bed at a specific low load.[Methods]Computational Fluid Dynamics(CFD)numerical simulation was employed to investigate the effectiveness and feasibility of in-furnace denitration within a 350 MW supercritical CFB boiler.The research primarily consisted of three parts:firstly,comparing and analyzing the impact of ammonia injection via nozzles installed at different locations-the coal feed port,upper/lower secondary air ports(front wall),and return material port on denitration efficiency to determine the optimal injection location;secondly,studying the influence of the ammonia-to-nitrogen molar ratio(NSR)on both denitration efficiency and ammonia slip;finally,analyzing the effect of the injection velocity on denitration performance.[Results]The results show that:(1)The coal feeding port is the best ammonia injection position,and its denitration efficiency is 4.4％,2.4％and 12.9％higher than that of the upper secondary air outlet,the lower secondary air outlet and the return port,respectively.(2)When the molar ratio of ammonia to nitrogen increased from 1.0 to 1.5,the denitrification efficiency increased by 13 percentage points.At this time,the denitrification efficiency was 58.5％,and the ammonia escape was 7.6 mg/m3.When the molar ratio of ammonia nitrogen is further improved,the improvement of denitrification efficiency tends to be stable,and the ammonia escape concentration exceeds the standard.(3)The denitrification efficiency increases with the increase of ammonia injection speed.When the injection speed increases to 80 m/s,the NOx concentration decreases to 45.8 mg/m3,and the denitrification effect is the best.[Conclusion]Through full-furnace CFD simulation of the 350 MW supercritical CFB boiler under low-load conditions,this study identified the optimal ammonia injection location,NSR,and injection velocity.It provides a new approach and theoretical foundation for achieving efficient and stable denitration in CFB boilers operating under low-load conditions.关键词
循环流化床锅炉/数值模拟/炉内脱硝/氨氮摩尔比/脱硝优化Key words
circulating fluidized bed boiler/numerical simulation/in-furnace denitrification/NH3/NOx molar ratio/denitrification optimization分类
能源科技引用本文复制引用
梅佳伟,闫高程..低负荷下循环流化床全炉膛脱硝数值模拟研究[J].电力科技与环保,2026,42(2):223-233,11.基金项目
山西省基础研究计划资助项目(202403021212327) （202403021212327）
