乙烯/氧气预混火焰中燃空当量比对碳烟表面官能团和氧化活性的影响  

Effect of Equivalence Ratio on the Surface Functional Groups and Oxidation Reactivity of Soot in an Ethylene/Oxygen Premixed Flame

作　　者：王强[1] 韩伟[2] 宋崇林[1] 刘野[1] 汪晓伟[1] 吕刚[1] 李娜[1] Wang Qiang Han Wei Song Chonglin Liu Ye Wang Xiaowei Lü Gang Li Na(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China National Automobile Quality Supervision Test Center,Xiangyang 441004,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]国家汽车质量监督检验中心,襄阳441004

出　　处：《燃烧科学与技术》2016年第5期446-452,共7页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB228502);国家自然科学基金资助项目(51476115)

摘　　要：采用乙烯/氧气/氩气预混燃烧系统和毛细管取样系统并结合多种先进分析技术,研究了预混火焰燃空当量比对碳烟颗粒表面官能团及其氧化活性的影响.结果表明,随燃空当量比的增加,碳烟颗粒表面脂肪族C—H官能团和含氧官能团(C—OH和C=O官能团)的摩尔分数均呈下降趋势;而碳烟颗粒的氧化反应特征温度和表观活化能呈增大趋势,表明在较大燃空当量比下所生成碳烟颗粒的氧化活性较低;碳烟颗粒表面官能团对氧化活性有着直接作用,表面官能团含量越多,其氧化反应活性越高.碳烟颗粒表面脂肪族C—H官能团对其氧化活性影响相对较大,而含氧官能团影响相对较小.In this paper,the effect of equivalence ratio on the surface functional groups and oxidation reactivity ofsoot and the correlations between surface functional groups and oxidation reactivity of soot were studied.Experimentswere performed in a burner-stabilized ethylene/oxygen /argon premixed flame,and the soot was collected by an insitucapillary system and analyzed using several advanced technologies.Research results suggest that as the equivalenceratio increases,the relative content of aliphatic C-H decreases due to a gradual decrease in the peak area ratioof aliphatic C-H to aromatic C=C.Simultaneously,a general decrease is found in the molar percentage of oxygenatedsurface functional groups（C-OH and C=O）.By contrast,the oxidation reactivity temperature and apparentactivation energies increase with an increase in the equivalence ratio,indicating a decreased oxidation reactivity ofsoot.Surface functional groups have an effect on the oxidation reactivity of soot.The more surface functional groupsthere are,the higher oxidation reactivity for the soot is.The aliphatic C-H functional groups act as a more importantfactor than the two oxygenated functional groups in governing soot oxidation.

关 键 词：碳烟 乙烯/氧气/氩气预混火焰 当量比 表面官能团 氧化活性 

分 类 号：TF055[冶金工程—冶金物理化学]