燃烧器钝体扩展角度对半焦/烟煤混燃及NOx排放的影响  

Effect of different blunt body extensive angles on semi-coke/bituminous coal co-combustion and NOx emission

作　　者：孙刘涛 闫永宏[1] 陈登科 彭政康 孙锐[1] SUN Liutao;YAN Yonghong;CHEN Dengke;PENG Zhengkang;SUN Rui(Institute of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《华电技术》2020年第7期20-27,共8页HUADIAN TECHNOLOGY

基　　金：国家重点研发计划项目(2017YFB0602002)。

摘　　要：在300 kW热态中试试验炉上,通过测量燃烧器下游主燃区不同轴向、径向位置的炉膛温度以及O2,CO,NOx等气体的含量来研究直流燃烧器钝体扩展角度对神木半焦与神华烟煤混合燃烧(半焦、烟煤质量比为45∶55)时着火特性以及NOx排放的影响。研究结果表明:随着直流燃烧器钝体扩展角的增大,着火逐渐向炉膛上游移动,O2体积分数谷值和CO质量浓度峰值(即强还原性气氛)在径向逐渐向炉膛壁移动;扩展角度为29°时,炉膛的整体温度较高,稳燃和NOx减排效果较好。The content of O2,CO,NOx and other gases,and the furnace temperature at different axial and radial positions in the downstream main combustion zone of a burner were measured in a 300 kW thermal pilot test furnace.Accordingly,the influence of the extensive angle of an once-through boiler's blunt body on the ignition characteristics of Shenmu semi-coke and Shenhua bituminous coal co-combustion(semi-coke and bituminous coal were blended with a mass ratio of 45∶55)and NOx emissions was investigated.The results show that with the enlarging of the extensive angle,the ignition position gradually moves towards the upper chamber of the furnace,and the valley value of O2 volume fraction and the peak value of CO mass concentration,namely the strong reducing atmosphere,gradually move towards the furnace wall along the radical direction.When the extensive angle is 29°,the overall temperature of the furnace is considerably high,and the combustion is stable and the NOx emission is reduced.

关 键 词：半焦 烟煤 混燃 钝体燃烧器 扩展角度 着火特性 NOX排放 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]