中国激光, 2019, 46 (4): 0411001, 网络出版: 2019-05-09
扩散火焰中燃料种类对碳烟演变过程的影响 下载: 1269次
Effects of Fuel Types on Soot Evolution in Diffusion Flames
光谱学 燃烧诊断 激光诱导炽光 碳烟 激光诱导荧光 多环芳烃 增长速率 spectroscopy combustion diagnostics laser-induced incandescence soot laser-induced fluorescence polycyclic aromatic hydrocarbon growth rate
摘要
采用激光诱导炽光和激光诱导荧光技术研究了燃料种类对碳烟演变过程的影响。以CH4、C2H4、C3H8的扩散火焰为研究对象,测量了碳烟的体积分数、粒径、颗粒数浓度以及多环芳烃相对浓度的二维分布。结果表明: CH4、C2H4、C3H8火焰的碳转化因子分别为0.0058、0.144、0.043;碳烟颗粒的平均粒径为9.2,20.8,14.7 nm,对应的颗粒数浓度分别为6.9×10
21,8.7×10
21,7.8×10
21 m
-3;对于含有较多碳原子或不饱和键的燃料,碳烟和环芳烃的生成演变过程更为迅速;比表面增长速率和生长时间的综合变化导致C2H4火焰中碳烟颗粒的粒径最大,C3H8次之,CH4最小。
Abstract
The effects of fuel types on the soot evolution are studied using laser-induced incandescence (LII) and laser-induced fluorescence (LIF) technologies. The diffusion flames from methane, ethylene and propane are selected as research objectives, and the two-dimensional distributions of volume fraction, primary particle size, and particle number concentration of soot as well as the relative concentration of polycyclic aromatic hydrocarbon (PAH) are measured. The measurement results show that the carbon conversion factors in methane, ethylene and propane flames are 0.0058, 0.144 and 0.043; the average particle sizes of soot are 9.2, 20.8 and 14.7 nm, and the corresponding particle number concentrations are 6.9×10
21, 8.7×10
21 and 7.8×10
21 m
-3, respectively. It is found that the PAH and soot formation are fast in the flame for the fuel with the unsaturated bond or more carbon atoms. The comprehensive changes in both specific surface growth rate and growth time for the soot result in the largest soot particle size in ethylene flame and followed by the propane flame and methane flame.
吴建, 陈玲红, 周剑武, 张健夫, 吴学成, 岑可法. 扩散火焰中燃料种类对碳烟演变过程的影响[J]. 中国激光, 2019, 46(4): 0411001. Jian Wu, Linghong Chen, Jianwu Zhou, Jianfu Zhang, Xuecheng Wu, Kefa Cen. Effects of Fuel Types on Soot Evolution in Diffusion Flames[J]. Chinese Journal of Lasers, 2019, 46(4): 0411001.