温度对准东煤燃烧碱金属释放特性影响的激光测量研究  

Effects of temperature on the release of sodium and potassium during combustion of zhundong coal using laser-induced breakdown spectroscopy

作　　者：李涛[1] 许东相 景雪晖[1] 何勇[2] 张彦威[2] 王智化[2] 周俊虎[2] 

机构地区：[1]国网新疆电力公司电力科学研究院,新疆乌鲁木齐830000 [2]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《能源工程》2015年第3期8-11,19,共5页Energy Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(2013FZA4010);中国博士后科学基金项目(2014M551732)

摘　　要：针对煤燃烧过程中释放的碱金属引起锅炉换热面沾污和腐蚀的问题,通过在线标定,利用激光诱导击穿光谱(LIBS)技术定量测量了准东煤燃烧过程中钠和钾随时间的动态释放特性;实验中利用一个自制的多射流燃烧器模拟真实火焰环境,在线测量得到准东煤燃烧过程中碱金属释放过程。实验发现煤燃烧过程的挥发分阶段、焦炭阶段、灰分阶段可以通过测得的碱金属释放曲线进行时间划分;随着温度升高,煤燃烧挥发分阶段、焦炭阶段、灰分阶段的Na、K释放速率均显著增加。During coal combustion,the released alkali species,mainly sodium（ Na） and potassium（ K） compounds,may cause severe problems like fouling and corrosion of the heat transfer surface in industrial furnaces. The time-resolved amounts of sodium and potassium release simultaneously from burning coal were quantitatively measured,using the Laser-induced breakdown spectroscopy technique. A specially designed laminar burner was employed to provide real fame environment,in which the in-situ measurement of Na and K release of Zhundong coal was carried out. The research showed that the three stages of coal combustion,devolatilization stage,char stage and ash stage,can be distinguished by the measured release curve. The release rate of Na and K increased with the increasing temperature in all three stages.

关 键 词：准东煤 LIBS 碱金属释放 温度 

分 类 号：TK16[动力工程及工程热物理—热能工程]