The effect of the mixing characters of primary and secondary air on NOx formation in a swirling pulverized coal flame
The effect of the mixing characters of primary and secondary air on NOx formation in a swirling pulverized coal flame
复制标题
DOI：
10.1016/j.fuel.2005.04.019
复制
发表时间：
2005-11
期刊：
影响因子：
7.4
通讯作者：
M. Gu;Mingchuan Zhang;W. Fan;Lei Wang;Fengguo Tian
中科院分区：
文献类型：
--
作者：
M. Gu;Mingchuan Zhang;W. Fan;Lei Wang;Fengguo Tian
采用数值模拟的方法研究了旋流煤粉燃烧器内煤粉燃烧运动特性和燃烧过程，分析了NOx生成与气流运动和煤粉燃烧运动的关系。在三种旋流数s= 0.5，1.03和1.2时，得到了颗粒进入IRZ的深度Ldav和IRZ的有效时间τ eav。结果表明，NOx排放量最小值出现在最大Ldav和最大τ eav处，NOx排放量最小值出现在最大Ldav和最大τ eav处，最大Ldav和最大τ eav同时出现（s=1.03）。研究还发现，随着煤粉粒径的增大，颗粒在IRZ内的停留时间τ先增大后减小。
The characteristics of burning pulverized coal motion and the combustion process are investigated by numerical simulation to analyze the relations between the NOxformation and the gas flow and burning pulverized coal moving in a swirl pulverized coal burner. The depth of particle penetration into the IRZ Ldavand the effective time of IRZ τeavare obtained under three swirl numbers s=0.5, 1.03 and 1.2, respectively. The results show that the minimum outlet NOxemission appears at the maximum Ldavand τeavand the minimum outlet NO emission, the maximum Ldavand the maximum τeavoccur at the same time (s=1.03). It is also found that, the diameter of pulverized coal first increases, but then decreases the particle residence time τintin IRZ.