燃料型NO在对冲扩散火焰中的生成和还原特性  

NO Formation and Reduction in Fuel-N-Doped CH_4/Air Counterflow Diffusion Flames

作　　者：张海[1] 李金晶[1] 樊融[1] 韩玮[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《燃烧科学与技术》2009年第3期191-195,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50576041);回国人员启动基金资助项目(041501056)

摘　　要：在CH4/空气对冲扩散火焰的燃料侧人为地掺混一定体积分数的NH3或HCN,数值模拟燃料型NO的生成和还原.模拟使用CHEMKIN和GR I3.0反应机理.结果表明,NO的生成和还原集中在火焰锋面,在火焰中心附近体积分数值最大.在燃料侧,NO的体积分数分布与燃料N的含量及NO初始体积分数值相关,而在空气侧主要受燃料N的影响.不加燃料N时,火焰中NO主要为热力型NO,受拉伸的影响大于燃料的影响;加入燃料N时,火焰中的NO主要为燃料型NO,受燃料体积分数的影响大于拉伸的影响,含量相同时NH3比HCN有更明显的促进NO生成的作用.In order to understand the formation and reduction characteristics of fuel-type NO, numerical simulation was conducted in CH4/Air counterflow diffusion flames using CHEMKIN software and GRI3.0 reaction mechanism, by doping fuel-N compounds, NH3 and HCN, in the fuel stream. The results show that NO formation and reduction occur within the flame and the peak NO concentration is located in the middle of the flame. On the fuel side, the axial profile of NO volumetric concentration along the centerline depends on the initial concentrations of NO and fnel-N compound; while on the air side, the axial NO profile mainly depends on the initial concentration of fuel-N compound. When the inlet stream is free of fuel-N, the NO formed within the diffusion flame is mainly of thermal type, and the formation is more sensitive to flow stretch than to fuel concentration. However, when fuel-N is presence in the inlet stream , the NO formed within the flame is chiefly of fuel type, and the formation is more sensitive to fuel concentration than to flow stretch. With the same volumetric concentration, NH3 is more favorable to the formation of NO than HCN.

关 键 词：扩散火焰 NO 燃料氮 对冲火焰 挥发分氮 

分 类 号：TQ038.4[化学工程]