CH4/CO2非预混射流火焰燃烧特性实验研究  

Experimental Study on Combustion Characteristics of CH4/CO2 Non-premixed Jet Flames

作　　者：陈钰方 张孝春 李星 张京[2,3,4] 汪小憨[2,3,4] 赵黛青[2,3,4] Chen Yufang;Zhang Xiaochun;Li Xing;Zhang Jing;Wang Xiaohan;Zhao Daiqing(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Key Laboratory of Renewable Energy,Chinese Academy of Sciences,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou 510640,China)

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]中国科学院广州能源研究所,广州510640 [3]中国科学院可再生能源重点实验室,广州510640 [4]广东省新能源和可再生能源研究开发与应用重点实验室,广州510640

出　　处：《燃烧科学与技术》2019年第6期542-548,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51506204);广东省自然科学基金资助项目(2016A030310125);中国科学院先导专项基金资助项目(XDA 21060102);广东省新能源和可再生能源研究开发与应用重点实验室开放基金资助项目(y809jh1001)

摘　　要：为了掌握含杂质生物沼气在工业燃烧装置中非预混射流火焰燃烧特性,对CH4/CO2非预混射流火焰在300 K和600 K伴流空气中的火焰形态、火焰高度以及推举高度进行了实验研究,并与CH4/N2非预混射流火焰燃烧特性进行对比.实验结果表明:在相同工况下,CH4/CO2火焰高度较低,但其推举高度高于CH4/N2火焰;两种火焰推举高度随伴流温度升高而降低.采用预混火焰模型对火焰推举高度进行了理论分析,得到了两种非预混火焰无量纲火焰推举高度与无量纲燃料流速的关联式.基于预混火焰模型的理论分析表明,预混气层流火焰速度及燃料和氧化剂密度比对非预混火焰的推举高度的影响较为显著.To understand the combustion characteristics of non-premixed jet flames of biogas in an industrial combustor,the shape,height and liftoff height of CH4/CO2 non-premixed jet flames with co-flow air at 300 K and 600 K were studied experimentally.In addition,the combustion characteristics of CH4/N2 non-premixed jet flames were also compared.Experimental results show that under the same working condition,the flame height of CH4/CO2 flame was lower than that of CH4/N2 flame,but its liftoff height was higher.Moreover,the liftoff heights of both flames decreased with the increase in co-flow temperature.A premixed flame model was employed to analyze the liftoff height theoretically,and the relationship between the dimensionless liftoff height and dimensionless fuel velocity in these two non-premixed flames was obtained.The theoretical analysis based on the premixed flame model shows that the laminar flame velocity of premixed gas and the density ratio of fuel to air have significant effects on the liftoff height of non-premixed flame.

关 键 词：非预混射流火焰 燃料稀释 高温伴流 火焰推举 

分 类 号：TK16[动力工程及工程热物理—热能工程]