循环流化床高氧气浓度下煤燃烧和氮氧化物排放特性  

Coal Combustion and Nitrogen Oxide Emission at Oxygen-enriched Atmosphere in Circulating Fluidized Bed

作　　者：段翠九[1,2] 赵科[1] 谭力[1,2] 吕清刚[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《锅炉技术》2011年第6期24-27,36,共5页Boiler Technology

基　　金：国家自然科学基金项目(50906084);中国博士后科学基金(20090450578);中国科学院知识创新工程重要方向项目(KGCX2-YX-399+3)

摘　　要：在燃烧室直径100mm、高3 000mm的循环流化床热态实验系统上,进行了高氧浓度的O2/N2气氛下的煤燃烧实验。实验结果表明,当氧气浓度32.2%～33.1%、二次风氧气浓度52%的情况下,循环流化床可稳定运行;实验中一次风比例和一次风氧气浓度在51.1%～83.5%和28.0%～36.0%范围内变化时,循环流化床燃烧室流动和换热状况良好;采用较低的一次风比例和一次风氧气浓度都可有效降低NOx生成量,但对N2O生成量的影响不大;通过优化配风,煤的燃烧效率可以达到98.67%。In order to investigate the characteristics of coal combustion and nitrogen oxide emission at oxygen-enriched O2/N2 atmosphere,experiments were carried out in the bench-scale circulating fluidized bed（CFB） facility with an inner diameter of 100 mm and a height of 3000 mm.The results show that the coal could combust stably in CFB with the oxygen concentration at 32.2% ~33.1% and the oxygen concentration of secondary air at 52%.When the primary air flux ratio ranges at 51.1%~83.5% and the oxygen concentration of the primary air at 28.0%~36.0%,the flow of bed meterials and heat transfer in CFB combustor have no transparent difference from that of coal combustion at air atmosphere.It is also presented that NOx emission could be reduced through lowering the primary air flux ratio and its oxygen concentration,however,it has no obvious effect on N2O emission.Coal combustion efficiency could reach 98.67% with the optimization of the air distribution.

关 键 词：循环流化床 燃烧 NOx N2O 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]