热力发电2025，Vol.54Issue(2)：57-67,11.DOI:10.19666/j.rlfd.202406134
烟气内循环和燃料分级对天然气低氮燃烧特性的影响
Effects of flue gas internal recirculation and fuel staging on low-nitrogen combustion characteristics of natural gas
摘要
Abstract
An axial tangentially swirl low nitrogen burner is designed based on flue gas internal circulation and staged combustion,and the effects of the burner's load,fuel staging,and recycled high-temperature flue gas on combustion and NOx emission characteristics are studied through industrial experiments and numerical simulations.The results indicate that,the loads and fuel staging ratios have a synergistic effect on NOx generation.Under medium and low load conditions,the NOx emissions increase monotonically with the secondary fuel ratio,large amount of NOx generates in the secondary flame zone.At full load,there exists an optimal primary to secondary fuel ratio(88:12),which minimizes the NOx emissions.When the secondary fuel ratio falls below 12%,the primary flame zone becomes dominant in NOx production.The length of the primary fuel mixing pipe can alter the fuel and air mixing process,thereby affecting NOx generation.When the relative length of primary fuel mixing pipe is shortened to 0.74,the main combustion zone moves upstream in the furnace,and the main flame is anchored in the middle of the furnace,resulting in a more uniform temperature distribution at the rear of the furnace.The NOx emission mass concentration decreases by 10%～20%across all loads,all below 30 mg/m³(with O2 volume fraction of 3.5%,the NOx is calculated as NO2).关键词
烟气内循环/轴切旋流/分级燃烧/低氮燃烧Key words
flue gas internal recirculation/axial vortex flow/staged combustion/low nitrogen combustion引用本文复制引用
彭俊豪,卓建坤,关靖宇,庞振洲,李伟,祝令坤,姚强..烟气内循环和燃料分级对天然气低氮燃烧特性的影响[J].热力发电,2025,54(2):57-67,11.基金项目
国家重点研发计划项目(2022YFB4003900) National Key Research and Development Program(2022YFB4003900) （2022YFB4003900）
