掺烧氨燃料对煤挥发分火焰特性及颗粒物生成的影响  

Effect of Co-firing Ammonia on Coal Volatile Flame Characteristics and Particulate Matter Formation Behaviours

作　　者：朱京冀 徐义书[1] 徐静颖[1] 王华坤 刘小伟[1] 于敦喜[1] 马晶晶 徐明厚[1] ZHU Jingji;XU Yishu;XU Jingying;WANG Huakun;LIU Xiaowei;YU Dunxi;MAJingjing;XU Minghou(State Key Laboratory of Coal Combustion(Huahzong University of Science and Technology),Wuhan 430074,Hubei Province,China;State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,Ningxia Univeristy,Yinchuan 750021,Ningxia Hui Autonomous Region,China)

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北省武汉市430074 [2]省部共建煤炭高效利用与绿色化工国家重点实验室(宁夏大学),宁夏回族自治区银川市750021

出　　处：《发电技术》2022年第6期908-917,共10页Power Generation Technology

基　　金：国家自然科学基金项目(51806075)。

摘　　要：掺烧“零碳、富氢、高氮”的氨气(NH3)燃料是实现燃煤电站CO_(2)减排的重要技术路径。为探究氨燃料的引入对煤燃烧及污染物生成行为的影响,基于McKenna平面火焰燃烧系统开展了煤掺氨燃烧实验,结合可见光相机、烟气分析仪及热泳探针取样分析系统,探究了掺烧氨燃料对煤挥发分火焰形态与温度特征、气态污染物及碳烟等细颗粒物生成的影响。研究结果表明:氨燃料先于煤着火,并加热促进煤热解及挥发分的生成与释放,促使挥发分着火燃烧,导致挥发分火焰长度和温度增加。掺烧的NH3在挥发分火焰中部分转化为NO,导致火焰中NO浓度显著升高。掺烧NH3提升了气相燃料当量比,促进了挥发分向碳烟的转化,促使碳烟颗粒生成量增加。Co-firing“zero-carbon,hydrogen rich,high nitrogen”ammonia(NH3)fuel in coal-fired power plant is an important technical route to mitigate CO_(2) emission.To explore the impacts of co-firing ammonia fuel on coal combustion and pollutant formation behaviour,the coalammonia co-firing experiments were carried out on a McKenna type flat-flame burner system.Combined with visible-light camera,flue gas analyser and thermophoresis probe sampling system,the influence of co-firing ammonia on the flame properties,gaseous pollutant and particulate matter formation was explored.The results show that the ammonia fuel ignites ahead of coal,and the additional heat released from ammonia combustion promotes the pyrolysis of coal and the release of volatile.Thereafter,it promotes the ignition and combustion of volatile,resulting in the increase of flame height and temperature.The added NH3 is partially converted into NO in the volatile flame,resulting in a notable increase in NO concentration.Adding NH3 improves the equivalent ratio of gaseous fuel,which promotes the conversion of volatile to soot,and finally increases the yield of soot particles.

关 键 词：燃煤电厂 碳排放 氨燃料 挥发分火焰 颗粒物 碳烟 

分 类 号：TK16[动力工程及工程热物理—热能工程]