摘要
本研究的目的是揭示富氧燃烧过程中的氮氧化物生成机理 ,针对富氧火焰特性探讨NOx 抑制机制机理。文中以对向流扩散火焰为对象 ,利用详细的基元反应动力学模型研究了燃料稀释对富氧空气 /甲烷扩散火焰中氮氧化物生成的影响 ,稀释剂为N2 或CO2 。结果表明 ,随着燃料中稀释组分浓度的变化 ,火焰结构和NO生成的决定机理显著变化 ;同时发现 ,随稀释剂CO2 浓度增大 ,NO的排放指数EINO(E missionIndexofNO)单调减少 ,随稀释剂N2 稀释时EINO存在最大值。
The present study is aimed at revealing the NO_x formation mechanism in an oxygen-rich combustion process. NO_x suppression mechanism is also investigated with the oxygen-rich flame characteristics being taken account of. With a counter-flow diffusion flame serving as an object of research the impact of fuel dilution on the NO_x formation in an oxygen-rich air/methane diffusion flame was studied with the help of a fully developed elementary reaction-dynamics model. The diluent being used is N_2 or CO_2. It is found that with the variation of concentration of dilution constituent elements in fuel there emerged a marked change in flame structure and NO formation mechanism. It is also discovered that with an increase in the concentration of diluent CO_2 the emission index of NO decreases monotonically and the latter index may reach a maximum value when N_2 is used as a diluent.
出处
《热能动力工程》
CAS
CSCD
北大核心
2004年第4期367-371,420,共6页
Journal of Engineering for Thermal Energy and Power
基金
中国科学院"百人计划"项目
广东省自然科学基金 ( 0 3 2 70 3 )
关键词
对向流扩散火焰
燃料稀释
氮氧化物
counter-flow diffusion flame, fuel dilution, NO_x, numerical analysis.
