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对比研究了燃用普通柴油和低硫柴油其排气超细颗粒数量浓度分布及化学成分特征.结果表明,相对于燃用普通柴油,燃用低硫柴油其排气总颗粒质量浓度略有降低,而数量浓度显著降低,且降幅随负荷和转速增大.燃用普通柴油和低硫柴油其排气微粒数浓度粒径分布曲线形状基本相似,同一测试工况下,相对于燃用普通柴油,燃用低硫柴油其排气积聚模态微粒数量浓度变化较小,而核模态微粒排放显著降低.发动机排气微粒主要由C,O,Cl,S,Si,Ca,Na,Al,K元素组成,燃用普通柴油和低硫柴油其排气微粒元素组成基本相似,但燃用低硫柴油排气微粒中没有发现S元素.排气微粒中挥发性有机物(SOF)主要成分有饱和烷烃(碳原子数为C15~C26)、有机酸酯和多环芳烃等.燃用低硫柴油时微粒采样中未发现多环芳烃.
The results showed that compared with the ordinary diesel fuel, the total exhaust gas mass concentration slightly decreased with the use of low-sulfur diesel fuel , While the concentration decreased significantly with the increase of load and speed.The shape of particle size distribution curve of exhaust gas particle number of common diesel fuel and low sulfur diesel fuel was basically the same.Under the same test condition, , The emission and concentration of modal particles in combustion of low-sulfur diesel fuel changed little, while the emission of nuclear modal particles decreased significantly.The engine exhaust particles mainly consisted of C, O, Cl, S, Si, Ca, Na, Al, K element, the emission of particulate matter in diesel fuel is similar to that of low-sulfur diesel fuel, but no S element is found in the exhaust gas of low-sulfur diesel fuel.The main components of volatile organic compounds (SOF) in the exhaust gas particles are saturated Alkanes (C15 ~ C26), organic acid esters and polycyclic aromatic hydrocarbons, etc. Polycyclic aromatic hydrocarbons (PAHs) were not found in the sample particles when burning low-sulfur diesel.