物理化学学报Issue(1)：32-40,9.DOI:10.3866/PKU.WHXB201411051
掺混含氧燃料的柴油替代物部分预混火焰中多环芳香烃的荧光光谱和碳烟浓度
Fluorescence Spectra of Polycyclic Aromatic Hydrocarbons and Soot Concentration in Partially Premixed Flames of Diesel Surrogate Containing Oxygenated Additives
摘要
Abstract
Partial y premixed laminar flames were formed using our purpose-built burner. The soot reduction mechanism of blends of diesel and oxygenated fuel was explored. The mixture of toluene and n-heptane (volume ratio, 20:80) (T20) was used as a diesel surrogate. Methanol, ethanol, n-butanol, methyl butyrate, and 2,5-dimethylfuran (DMF) were blended with T20, whilst retaining a 4% oxygen content. Laser-induced fluorescence (LIF) was used to obtain spatial fluorescence spectra of polycyclic aromatic hydrocarbons (PAHs) in partial y premixed co-flow flames. Laser-induced incandescence (LII) was used to measure soot concentration (volume fraction). The formation and growth of PAHs in flames varied with the fuel blend. Four-ring aromatics (A4) exhibited similar formation and oxidation to soot, so A4 was suitable for estimating soot formation and oxidation. With oxygenated additives, the content of toluene is reduced in T20 fuel, which is the major reason for the reduction of PAH fluorescence spectral intensity and soot concentration. The contribution of different oxygenated additives to PAH formation also affected soot reduction. The PAH-LIF spectral intensity and soot concentration of n-butanol/T20 blends were lower than those of fuels containing methanol, ethanol, methyl butyrate, and DMF. Therefore, n- butanol more effectively reduced PAHs and soot emission during the combustion of the diesel surrogate (T20).关键词
含氧燃料/多环芳香烃/碳烟浓度/激光诱导荧光光谱/激光诱导炽光Key words
Oxygenated fuel/Polycyclic aromatic hydrocarbon/Soot concentration Laser induced fluorescence spectrum/Laser induced incandescence分类
化学化工引用本文复制引用
张鹏,刘海峰,陈贝凌,唐青龙,尧命发..掺混含氧燃料的柴油替代物部分预混火焰中多环芳香烃的荧光光谱和碳烟浓度[J].物理化学学报,2015,(1):32-40,9.基金项目
The project was supported by the National Natural Science Foundation of China (51206120).国家自然科学基金(51206120)资助项目 （51206120）
