摘要
采用数值模拟方法探究某天然气隧道窑炉内NO生成路径及主要基元反应速率,分析过剩空气系数和喷嘴的布置方式(喷嘴相错布置、喷嘴相对布置)对NO生成路径的影响。结果表明:当过剩空气系数为1.1时生成NO的主要基元反应速率较过剩空气系数为6.0小,生成NO较少。过剩空气系数从6.0增加到9.0时,生成NO主要基元反应R251、R236、R235的反应速率降低,NO生成减少。当喷嘴相错布置时,虽然生成NO的R216反应方向与喷嘴相对布置相反,但是炉内气流扰动增强,生成NO的主要基元反应速率增大,NO生成增加。
Numerical simulation is employed to study the NO generation path and key elementary reaction rates in a natural gas tunnel kiln. The influences of excess air coefficient and arrangements of nozzles( staggered arrangement of nozzles and relative arrangement of nozzles) on the NO generation path are analyzed. The results show that the main elementary reaction rates at excess air coefficient of 1. 1 are lower than that of excess air coefficient of 6. 0,resulting in less generation of NO. When excess air coefficient increases from 6. 0 to 9. 0,the reaction rate of the main elements for NO generation R251,R236,and R235 decreases and the NO generation decreases. When the nozzles are arranged in a staggered way,although the reaction direction of the R216 generating NO is opposite to the relative arrangement of the nozzles,the disturbance of the airflow in the kiln is enhanced,the main elementary reaction rate for NO generation increases,and the NO generation increases.
作者
王舸
曹艳光
贺天智
蔡磊
WANG Ge;CAO Yanguang;HE Tianzhi;CAI Lei
出处
《煤气与热力》
2020年第4期34-38,J0043,J0044,共7页
Gas & Heat
关键词
隧道窑
数值模拟
NO生成路径
过剩空气系数
喷嘴布置方式
tunnel kiln
numerical simulation
NO generation path
excess air coefficient
arrangement of nozzles
