柴油机燃烧正戊醇/F-T柴油尾气颗粒物分析

Analysis of particulate matter from diesel engine fueled with n-pentanol/F-T diesel

采集不同比例的正戊醇与F-T柴油的混合燃料在柴油机内燃烧后的尾气颗粒物,并采用气相色谱-质谱联用仪、扫描电镜、热重分析仪分析了颗粒物的可溶性有机成分(SOF)、颗粒物粒径和氧化特性.研究结果表明,与F-T柴油相比,混合燃料尾气颗粒物表面SOF中多环芳香烃(PAHs)的相对质量分数显著降低,最高降幅达55%;混合燃料尾气颗粒物粒径集中在20~50nm;且颗粒物失重峰氧化温度降低,氧化活性增强.

The particulate matter emitted from diesel engine fueled w ith different proportions of n-pentanol and F-T diesel s collected for analysis.The soluble organic components(SOF),microstructure and oxidation characteristics of the particles are analyzed by gas chromatography-mass spectrom etry,scanning electron microscopy and thermogravimetric analysis.The results show that the relative mass fraction of polycyclic aromatic hydrocarbons(P A H s)in the SOF of the mixed fuels is signiticantly reduced compared w ith the F-T diesel,w ith the highest drop of 55%.The particulatem atter clusters is in a particle size range of 20?50 nm.And the weight loss peak of the particulate matter is reduced,the oxidation activity is enhanced.