华电技术 ›› 2020, Vol. 42 ›› Issue (7): 20-27.

• 半焦与煤混合燃烧 • 上一篇    下一篇

燃烧器钝体扩展角度对半焦/烟煤混燃及NOx排放的影响

  

  1. 哈尔滨工业大学 能源科学与工程学院,哈尔滨 150001
  • 出版日期:2020-07-24 发布日期:2020-07-24

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

  1. Institute of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China
  • Online:2020-07-24 Published:2020-07-24

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。

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

Abstract: 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.

Key words: semi-coke, bituminous coal, co-combustion, burner with blunt body, extensive angle, ignition characteristics, NOx emission