The distribution features of soot concentration in an inverse diffusion flame
Concerns about the health effects of breathing soot and other fine particles are motivating global researchers to control the amount of soot emitted from the incomplete combustion process.Although several steps are believed to occur during the life-time of soot,particle inception is one of the least understood steps.This paper dedicates to the study on optical properties of nuclei soot nanoparticles after inception in the flame.In this study,an inverse diffusion flame burner(IDF)was employed to produce a stable 60mm-high flame by using ethylene and air,a photoacoustic analyzer(PA)linked with a sampler was employed to detect the mass concentration of soot nanoparticles after inception in the flame based on its optical features.The soot samples were gotten along the flame front from 2 mm up to the height of 60mm above the burner surface at the lateral axis with an interval spacing of 5mm.The results have been shown that the soot concentration increased along the flame direction at the lower part of the flame and inclined to a maximum value,and kept at a comparatively higher value at the middle part and decreased greatly along the flame in the upper part of the flame.Compared with the distribution of soot concentration and gas temperature,it illustrated that soot nanoparticles incepted in multitude at the lower part of the flame,where gas temperature was relatively lower,but generated very small amount at the point of higher temperature.Soot generation and soot oxidation existed simultaneously along the flame,soot concentration decreased due to soot destruction.
Soot nanoparticles Optical features Photoacoustic analyzer (PA) Inverse diffusion flame (IDF) Concentration distribution
Jianyi Lu
School of Environmental Science and Engineering.North China Electric Power University,Baoding,China
国际会议
桂林
英文
1-6
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）