摘要
针对低NOx排放的多气种燃烧器研发需求,利用详细化学反应机理开展了数值模拟工作,深入探究了H_(2)、H_(2)/CO、H_(2)/CH_(4),以及H_(2)/NH_(3)预混火焰中NO的生成机理。计算结果表明:H_(2)火焰中NO的生成机理包括NNH机理及热力型机理,后者起主导作用;添加CO强化O的生成从而加剧热力型NO的生成;H_(2)/CH_(4)火焰中NO的生成机理与CH_(4)火焰相似,包括火焰内的快速型机理和火焰后的热力型机理,H_(2)占比的改变引起NO排放浓度的变化量不超过15 ppm;H_(2)/NH_(3)火焰中NO主要来源于NH_(3)的氧化,贫燃条件下,H_(2)/NH_(3)火焰尾部NO排放浓度比H_(2)火焰高两个数量级,NO的生成对H+O_(2)=O+OH反应高度敏感,该反应的强化引起NO生成加剧。
Due to the demand on the research and development of low-NOx multi-gas burner,comprehensive numerical work with a detailed kinetic model was conducted on the NO formation mechanisms in the premixed flames of H_(2),H_(2)/CO,H_(2)/CH_(4),and H_(2)/NH_(3).Calculation results indicated:The NO formation mechanism in H_(2) flame includes the NNH mechanism and the thermal mechanism,and the latter is predominant;CO addition in the H_(2) flame enhances the thermal NO mechanism;The NO formation mechanism in H_(2)/CH_(4) flame is similar to that in CH_(4) flame,including the prompt mechanism and the thermal mechanism,and the change of the outlet NO mole fraction is less than 15ppm at various H_(2) blending ratios;NO in the H_(2)/NH_(3) flame mainly comes from NH_(3),with the outlet mole fraction two orders of magnitude larger than that in the H_(2) flame under the fuel lean condition,and the NO formation is most positively sensitive to the H+O_(2)=O+OH reaction.
作者
陈钧
王杜佳
杨章宁
范卫东
CHEN Jun;WANG Dujia;YANG Zhangning;FAN Weidong(Shanghai Jiao Tong University School of Mechanical Engineering,200240,Shanghai,China;Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province,611731,Chengdu,China;Dongfang Boiler Co.,Ltd,643001,Zigong,Sichuan,China)
出处
《东方电气评论》
2023年第1期20-27,共8页
Dongfang Electric Review
