摘要
利用模拟软件Fluent 6.3建立二维模型并进行合理设置,对多孔介质中的煤矿低浓度瓦斯燃烧进行数值模拟,研究了燃烧器端部设置导流板和没有导流板时的速率分布、温度分布和NOx生成情况。结果表明,有导流板的多孔介质燃烧器的速率分布比无导流板的燃烧器更加均匀;加导流板时,可防止回火,提高燃烧器的安全性,一定程度上有利于换热效率的提高;瓦斯流速较小时,无导流板燃烧器中生成的NOx较少,而流速增大一定量后,有导流板的NOx产生量较少,燃烧器设计时,应根据实际燃气速率的情况考虑导流板的设置。
The combustion of low concentration coal mine methane in porous media was numerically simulated through a two- dimensional model and reasonable setting by using software Fluent 6.3. The gas velocity and temperature distributions and the NOx formation in the porous media combustor with or without baffle in its front end were investigated. The results showed that the velocity distribution of the combustor with baffle was more uniform than that of the combustor without baffle; the combustor with baffle could prevent backfiring and improve safety and heat transfer efiqciency; and the formation of NO2 in the combustor without baffle was less at low velocity of methane, but when the velocity of methane increased to some extent, the formation of NO. with baffle was less. The baffle should be considered according to the velocity of methane in the design of combustor.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2012年第4期25-29,共5页
Natural Gas Chemical Industry
基金
科技型中小企业技术创新基金资助项目(11C26213204601)
江苏省科技型企业技术创新资金资助项目(BC2010057)
关键词
煤矿瓦斯
燃烧
导流板
多孔介质燃烧器
当量比
数值模拟
coal mine methane
CMM
combustion
baffle
porous media combustor
equivalence ratio
numerical simulation
