摘要
对从中间段——燃烧管中上游段多孔泡沫陶瓷与下游段多孔泡沫陶瓷之间的一段间隙结构 ,引入二次空气的多孔介质燃烧器的 CO和 NO排放浓度进行了实验测试 ,较系统地研究了化学当量比、混合气流率和不同比率二次空气对天然气 /空气燃烧排放的影响。结果表明 ,加入适当比率的二次空气 ,不仅能够在相当宽的流速范围内使火焰很好地稳定在中间段 ,而且能得到低水平的 CO排放浓度 ,特别对较低当量比效果更为明显。同时 ,当火焰定位在中间段或近旁时 ,在化学当量比为 0 .4 5~ 0 .8范围内 NO的排放值能够低于 6× 10 - 6 。
WT5”BZ]Emissions of CO and NO for a porous medium burner adding the secondary air from the middle section were studied experimentally.The middle section is formed of a gap between the upstream section and the downstream section of the porous foam ceramic in the burner with a middle hoop,into which the air can be poured from all around.The effects of equivalence ratios,flow rates of the mixture,and various fractions of secondary air on the emissions of natural gas/air combustion were examined systematically.The results show that a proper fraction of the secondary air could make the flame highly stable in the middle section within a wide range of flow rates,and have low emission of CO,specially for lower lean equivalence ratios.Values of NO emissions for the flames in,or around the middle zone could be perfectly low,smaller than 6×10 -6 at an equivalence ratio of 0.45~0.8. [WT5”HZ]
出处
《燃烧科学与技术》
EI
CAS
CSCD
2000年第2期124-128,共5页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目 !(5 95 76 0 2 1 )
关键词
多孔介质
燃烧器
燃烧排放
火焰稳定性
porous medium
burner
combustion emission
flame stability