空气管出口布置方式对平焰燃烧特性的影响  

Influence of Air Outlet Arrangement on Flat Flame Combustion Characteristics

作　　者：陈伟鹏[1] 韩一庆 张天睿 古旭龙 CHEN Wei-peng;HAN Yi-qing;ZHANG Tian-rui;GU Xu-long(Inner Mongolia Key Laboratory of Clean Combustion,School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学能源与环境学院内蒙古清洁燃烧重点实验室,包头014010

出　　处：《科学技术与工程》2021年第2期563-568,共6页Science Technology and Engineering

基　　金：内蒙古自治区自然科学基金(2018MS05035);内蒙古自治区教育厅项目(NJZZ17161);包头市昆区科技局项目(0903051901)。

摘　　要：为了减少CO和NO的排放,采用不同的空气出口布置方式,对平焰燃烧特性进行分析。实验结果表明:四管切圆和三管切圆两种空气出口布置方式都能形成平焰,空气旋流造成的负压区使回流阻力减少,高温炉气回流到焰心挤压在旋流的中央,也促进气流附壁,使燃烧更稳定;随着空气管至烧嘴中心轴线距离的增加,火焰面逐渐扩展,从而降低了燃烧区峰值温度,进而促使CO和NO含量的降低;在相同空气管距离下,四管切圆比三管切圆具有更大的火焰面和更均匀地分布,且峰值温度和CO、NO含量略低于后者。可见采用四管切圆布置方式,并适当增加空气管至烧嘴中心轴线的距离,更适合平焰燃烧器的低氮燃烧。In order to reduce the emission of CO and NO,the combustion characteristics of flat flame were analyzed by using diffe-rent air outlet arrangements.The experimental results show that both four-pipe and three-pipe air outlet arrangements can form a flat flame.The negative pressure areas caused by the air swirl reduce the return resistance.The high-temperature furnace gas flows back to the flame center and squeezes in the center of the swirl.As the distance from the air tube to the center axis of the burner increases,the flame surface gradually expands,thereby reducing the peak temperature of the combustion zone,which in turn promotes the reduction of CO and NO content;under the same air tube distance,the four-tube tangent circle has a larger flame surface and a more uniform distribution than the three-tube tangent circle,and the peak temperature and the contents of CO and NO are slightly lower than the latter.It is concluded that the four-tube tangential arrangement is adopted,and the distance between the air tube and the central axis of the burner is appropriately increased,which is more suitable for the low-nitrogen combustion of the flat flame burner.

关 键 词：CO、NO排放 平焰燃烧 布置方式 四管切圆 

分 类 号：TK16[动力工程及工程热物理—热能工程]