生物柴油发动机尾气中的颗粒物特性分析

运用扫描电镜和X射线能谱仪对柴油机燃烧生物柴油和0＃柴油尾气排放中收集的颗粒物样品进行检测和分析。研究结果表明，生物柴油因含氧而减少燃烧过程中燃料碳缺氧的几率，颗粒物中碳烟成分少，颗粒物粒径较小，在聚集状态的表面形貌上表现得更致密。而0＃柴油燃烧后产生的颗粒物样品因碳烟成分多，颗粒物粒径较大，在聚集状态的表面形貌上表现为葡萄球状的粘结。元素分析结果表明，两个样品的差别在于在0＃柴油颗粒物样品中检测到硫，而在生物柴油的颗粒样品中未检测到硫。生物柴油是石化柴油的一种优质替代燃料。

Analysis of the features of the particulate matters generated from diesel engine fueled with biodiesel

Scanning electronic microscope and X-ray energy spectrometer were used to detect the surface structure and chemical component of particulate matter samples from the exhausts of diesel engine fueled with biodiesel and No.0 diesel fuel respectively. The particulate matter from biodiesel engine has less component of dry soot and the diameter is small, so the surface appearance of the conglomerated status looks more compact. While the surface appearance of particulate matter from No.0 diesel exhibits the grape-shaped cohering. Results of elemental analysis reveal that there is only sulfur element in the particulate matter from No.0 diesel. Therefore, biodiesel plays a good role as an alternate to the petrolic diesel.