摘要
建立了一维非稳态球形煤粉颗粒团的群燃烧模型.数值模拟煤粉颗粒团的着火和燃烧过程,获得了颗粒团燃烧火焰随时间的变迁.分析了煤粉颗粒团内部参数和外部环境参数对颗粒团着火和燃烧的影响.随着颗粒团内煤粉浓度的增加,颗粒团的均相着火延迟先减小后增加.增加煤粉颗粒尺寸和降低外部温度都会明显延迟均相着火.环境氧气含量的增加会减小着火延迟,同时增加颗粒团的燃烧速率.模拟计算和文献试验结果的变化趋势相吻合.
A transient group combustion model was presented for the pulverized coal particles in spherical cloud. Homogeneous and heterogeneous reactions were modeled to take account of the interactions of particles. The variation of flame structure of cloud was obtained. The effects of parameters on cloud ignition and combustion were analyzed. The homogeneous ignition delay was decreased, and then increased with the increase of concentration of particles. The increase of pulverized coal size and decrease of ambient gas temperature delay homogeneous ignition. The delay time was reduced, and the combustion rate was increased with the increase of oxygen concentration. Simulation results were in agreement with published experimental findings.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2007年第2期107-112,共6页
Journal of Combustion Science and Technology
关键词
颗粒群燃烧
煤粉颗粒团
着火
group combustion
pulverized coal cloud
ignition
