多孔介质燃烧-换热器NO_x排放的二维数值研究  

TWO-DIMENSIONAL NUMERICAL STUDY OF NO_x EMISSIONS IN POROUS MEDIA COMBUSTOR-HEATER

作　　者：史俊瑞[1] 解茂昭[2] 徐有宁[1] 马金凤[1] 薛治家[1] 

机构地区：[1]沈阳工程学院能源与动力工程系,辽宁沈阳110136 [2]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《工程热物理学报》2011年第2期353-356,共4页Journal of Engineering Thermophysics

基　　金：辽宁省教育厅科学计划资助(No.2008491);辽宁省博士启动基金(No.20081073);国家自然科学基金资助项目(No.50476073)

摘　　要：通过二维单温模型,考虑甲烷燃烧的详细化学反应机理,数值研究多孔介质燃烧-换热器内的燃烧、传热和NO排放规律。研究主要工作参数过量空气系数和燃烧器功率对氮氧化物排放的影响。结果表明,过量空气系数和功率对NO排放有显著的影响。功率一定时,过量空气系数由1.12增大到1.42时,NO体积分数由3.9E-5减少到1.8E-5。随着功率的增大,NO的排放呈线性增长。在宽广的工况范围内,数值预测与实验值取得了定性的一致。Based on a two-dimensional model with detailed combustion chemistry, combustion, heat transfer and NO emission in combustor-heater are numerically investigated. Attention was focused on the influence of the working parameters on the NO emissions. Results revealed that the excess air ratio and firing rate have significant influence on NO emissions in the unit. It is shown that mole fraction of NO decreases from 3.9E 5 to 1.8E-5 with increasing excess air ratio from 1.12 to 1.42 at constant firing rate. In addition, it is indicated that NO increases significantly when increasing the firing rate at constant excess air ratio. Over a wide range of working conditions, the numerical predictions show qualitative agreements with experimental data available from the literature.

关 键 词：多孔介质 燃烧-换热器 氮氧化物 数值研究 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]