煤层气燃烧NO_x生成特性及影响因素数值模拟  

Numerical simulation on NO_x formation characteristics during coalbed methane combustion and the influencing factors

作　　者：张清叶[1] 李建雄[1] 

机构地区：[1]河南机电高等专科学校,河南新乡453002

出　　处：《热力发电》2013年第9期59-62,共4页Thermal Power Generation

摘　　要：采用非预混燃烧模型对煤层气燃烧及NOx生成进行了数值模拟,研究了煤层气中甲烷浓度、过量空气系数及射流角度等因素对NO生成的影响。结果表明:随着甲烷浓度的增大,NOx生成量增大,CH4浓度从25%增大到45%时,燃烧室出口面上NO质量分数提高8倍左右;过量空气系数为1.00时,出口面上平均NO质量分数最大,过量空气系数在1.00以上增大时,生成NOx量降低;射流角度变化对燃烧温度及NOx生成的影响较小。On the basis of non-premixed combustion model,the combustion process and NOx formation characteristics of coalbed methane were numerically simulated,to investigate the effect of factors like the methane concentration,the excess air ratio and the jetting angle on NOxformation.The results showed that,when the methane concentration increased from 25%to 45%,the mass fraction of NO at outlet surface of the combustion chamber increased by above 8times,it showed a peak when the excess air ratio was 1.00and decreased when the excess air ratio was larger than 1.00.The change of jetting angle had little influence on the combustion temperature and NOx formation.

关 键 词：煤层气 燃烧 NOx生成 甲烷浓度 过量空气系数 射流角度 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]