Ignition and devolatilization of pulverized coals in lower oxygen content O2/CO2 atmosphere

摘要：

High speed camera is employed to capture the transient images of the burning particle in a flatflame entrained flow reactor,Some information of the burning particle,such as the optical intensity and the residence time,are obtained through analysis of transient images.The ignition and devolatilization behavior of different rank coals at 1670K,1770K and 1940K over a range of 2-30％ O2 in both N2 and CO2 diluent gases are researched.The results indicate that the laws of ignition and devolatilization of pulverized coals in low oxygen O2/CO2 atmosphere are consistent with the literature,which focus on the environments of high oxygen contents (10％~30％) or lower temperate (900K-1500K).With the gas temperature and oxygen content increased,the ignition delay time and devolatilization time for the lower oxygen content cases decreased for both N2 and CO2 atmosphere.With the use CO2 in place of N2 in low oxygen conten,the ignition delay was retarded and the duration of devolatilization was increased.The effect of CO2 on coal particle ignition is explained by its higher molar specific heat.And the effect of CO2 on devolatilization results from its effect on the diffusion rates of volatile fuel and oxygen.

关键词： Coal Ignition Devolatilization High speed camera Flat-flame Lower oxygen content O2/CO2

作者: Xiaohong Huang Jing Li Zhaohui Liu Ming Yang Dingbang Wang Chuguang Zheng

作者单位: State Key Laboratory of Coal Combustion,Huazhong University of cience and Technology,Wuhan 430074,Ch State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,C

会议类型: 国际会议

会议名称: The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)

会议地点: 哈尔滨

会议语种:英文

页码: 83-86

在线出版日期: 2011-07-19（万方平台首次上网日期，不代表论文的发表时间）