顶烧炉内燃烬风对NO减排影响的数值分析  

Numerical analysis of effects of over-fired air on NO reduction in a down-fired furnace

作　　者：张俊霞[1] 沈鉴彪[2] 李皓栋 李鹏腾 

机构地区：[1]榆林学院能源工程学院,陕西榆林719000 [2]北京科技大学机械工程学院,北京100083

出　　处：《洁净煤技术》2015年第5期85-90,共6页Clean Coal Technology

基　　金：陕西省科技厅工业攻关项目(2015GY099)

摘　　要：为了研究燃烬风对顶烧炉内煤粉燃烧中NOx生成的影响,采用计算流体力学软件Fluent6.3.26对顶烧炉中煤粉燃烧进行数值分析,分别计算了3种燃烬风位置时炉内温度场、速度场和组分场的分布。结果表明:顶烧炉中一二风下方的钝体和燃烬风的互相配合在炉膛内有效形成了贫氧区,会抑制燃料型NO的生成。随燃烬风位置下移,炉内温度较低,会形成较大的煤粉回流区,炉膛出口的NO排放量也相应较低。将炉膛出口的NO含量计算结果与文献中实验数据比较,误差小于18.4%。To investigate effects of over- fired air on NO reduction in a down- fired furnace,Fluent6. 3. 26 which was used to calculate fluid mechanics was adopted to simulate the combustion process of pulverized coal in a down- fired furnace. Parameters in the furnace were obtained at three kinds of over- fire air position,including temperature fields,velocity fields and concentration fields. The interaction of bluff body and over- fire air formed a lean- oxygen area which prohibited the formation of NO. As the over- fire air moved downward,and a larger recirculating zone of pulverized coal appeared. NO content at the outlet of the furnace reduced. The NO at the outlet of the furnace were compared to the experimental data in reference,the error were less than 18. 4%.

关 键 词：顶燃式热风炉 煤粉燃烧 NO 炉内温度场 速度场 组分场 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]