不同氧浓度下煤挥发分燃烧的化学动力学研究  

Chemical kinetic study on coal volatiles combustion for various oxygen concentrations

作　　者：陈晨 杨倩 陈云 张睿 刘冬[1] CHEN Chen;YANG Qian;CHEN Yun;ZHANG Rui;LIU Dong(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;Zhejiang Zheneng Electric Power Limited Company,Hangzhou 310000,Zhejiang,China)

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094 [2]浙江浙能电力股份有限公司,浙江杭州310000

出　　处：《化工学报》2022年第9期4133-4146,共14页CIESC Journal

基　　金：国家自然科学基金项目(52076110);中央高校基本科研业务费专项资金项目(30920031103)。

摘　　要：燃煤有机污染物对人类健康和生态环境存在严重危害,而O_(2)对火焰中有机产物的形成具有明显的调控作用。鉴于煤挥发分燃烧是燃煤过程中至关重要的一环,本文以煤热解气为燃料,通过数值模拟研究了氧化剂侧O_(2)浓度对对冲扩散火焰中碳氢产物生成特性和机制的影响。结果表明,O_(2)浓度升高促进了O和OH的生成,进而提高H浓度,突显了含H和OH参与的反应的重要性。此外,乙炔(C_(2)H_(2))、丙炔(PC_(3)H_(4))、炔丙基(C_(3)H_(3))、乙烯基乙炔(C_(4)H_(4))、苯(C_(6)H_(6))和萘(C_(10)H_(8))的浓度均增大。增加O_(2)浓度促进了C_(2)H_(2)向PC_(3)H_(4)的转化,并使得C_(3)H_(3)更倾向于转化为丁二烯(C_(4)H_(6)),而富烯更倾向于通过苯基(C_(6)H_(5))生成C_(6)H_(6),因此C_(6)H_(5)作为C_(6)H_(6)前体的地位被加强。Coal-burning organic pollutants have serious harm to human health and ecological environment,and O_(2) has a significant regulatory effect on the formation of organic products in flames.In view of the fact that coal volatiles combustion is a crucial part of coal combustion,the effect of O_(2) concentration on hydrocarbon formation characteristics and mechanisms in counterflow diffusion flame was studied by numerical simulation using coal pyrolysis gas as fuel.The results showed that the increase of O_(2) concentration promoted the formation of O and OH,which in turn increased H concentration,highlighting the importance of reactions involving H and OH.In addition,concentrations of acetylene(C_(2)H_(2)),propyne(PC_(3)H_(4)),propargyl(C_(3)H_(3)),vinylacetylene(C_(4)H_(4)),benzene(C_(6)H_(6))and naphthalene(C_(10)H_(8))all increased.Increasing O_(2) concentration promoted the conversion from C_(2)H_(2) to PC_(3)H_(4),and made C_(3)H_(3) more inclined to convert to butadiene(C_(4)H_(6)),while fulvene was more inclined to generate C_(6)H_(6) through phenyl(C_(6)H_(5)).Therefore,the status of C_(6)H_(5) as a precursor of C_(6)H_(6) was strengthened.

关 键 词：热解 氧气浓度 对冲扩散火焰 有机烃类污染物 反应动力学 化学分析 

分 类 号：TK11[动力工程及工程热物理—热能工程]