摘要
对改进前后两种低热值煤层气燃烧器进行了全尺寸的三维数值模拟,给出了两种燃烧器速度场、温度场和浓度场的分布情况,结果表明,改进后的燃烧器在产生中心回流区和外回流区的同时,还能具有较好的射流刚性;具有较宽的甲烷体积浓度调节比,在燃烧甲烷浓度较低(20%,体积分数)的煤层气时,还能保持较高的燃烧温度,高温区域分布较广,燃烧效率高.
The full-size three-dimensional numerical simulation study on two kinds of low calorific value coal-bed gas burner before and after improvement is conducted.Two kinds of bur-ner＇s velocity field,temperature field and concentration field distribution are presented.The results show that the improved burner not only produces central backflow region and outer backflow region,but also has good jet flow rigidity.The improved burner has a wide ratio for regulating the concentration of methane when combusts the gas which mechane volume concentration is low about 20 percent,can also maintain a high combustion temperature,and has a wide region of high temperature distribution,and has high combustion efficiency.
出处
《煤炭转化》
CAS
CSCD
北大核心
2010年第4期47-51,60,共6页
Coal Conversion
基金
重庆市自然科学基金重点资助项目(CSTC,2009BA6067)
关键词
低甲烷体积浓度
煤层气燃烧器
数值模拟
low-volume concentration of methane
coal bed gas burner
numerical simulation
