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《Journal of Combustion Science and Technology》 2006-02
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Influence of Volatile Flame on Combustion of Char Particle

YU Juan, ZHANG Ming-chuan, ZHOU Yue-gui, FAN Wei-dong, FAN Hao-jie (Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China)  
The programs for simulating pulverized-coal particle combustion, which take chemical reactions, and heat and mass transfer into account, were established in spherical coordinate system. Through contrastive experiment and numerical simulation between pulverized coal and devolatilized char, the influences of volatile flame on the CO gas reaction and char particle combustion were studied. The FTIR temperature-measuring experiment and numerical simulation on the dynamic process of pulverized coal combustion prove not only that the phenomenon of elevated particle temperature induced by CO flame in the initial period of ignition exists, but also that volatile flame induces the combustion of the primary product of surface reaction, CO. Due to the function of volatile flame, char particle may be ignited at temperature lower than its heterogeneous ignition temperature. It shows the physical essence of joint hetero-homogeneous ignition mode suggested by Juntgen.
【Fund】: 国家自然科学基金资助项目(50476018) 国家重点基础研究发展规划(973)资助项目(2004CB21770304).
【CateGory Index】: TQ534
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