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以一辆国III柴油公交车为试验样车,在重型底盘测功机上运行中国典型城市公交车循环(CCBC),分析了该车分别燃用不同体积分数的生物柴油混合燃料的颗粒物组分排放特性.结果表明:颗粒物测得的可溶性有机组分(SOF)主要是脂肪酸和直链烷烃,藿烷和PAHs占比低于7%.生物柴油对各组分影响较大,随着生物柴油掺混比例增加,颗粒物EC减小而OC/EC增加,SOF总量也增加.其中脂肪酸的C18:2和C18:1明显增加,C12:0和C14下降,直链烷烃总量和藿烷各组分均下降;PAHs的质量集中在三,四环的中小分子量,毒性集中在四环及以上的中高分子量.使用生物柴油后,PAHs总量下降,其中Pyr,FL和PA下降较明显,而总PAHs毒性无明显变化.“,”Based on a diesel bus certified to ChinaIIIemission standards, thecomposition of particulates emission with different proportions of biodiesel was investigated during China city bus cycle (CCBC) on a heavy chassis dynamometer. The results show that soluble organic fraction (SOF) was mainly consists of fatty acid and N-alkanes, while Hopanes and PAHs account for less than 7%. Biodiesel has a significant impact on the compositions, with the proportion of biodiesel going up, EC decreased while OC/EC and SOF increased, C18:2 and C18:1 of fatty acids increased apparently while C12:0 and C14 decreased, N-alkanes and Hopanes components also decreased. The mass of PAHs is concentrated in medium and small molecular with 3 or 4 Benzene rings, while the toxicity of PAHs concentrated in medium and high molecular with more than 4 Benzene rings. When using biodiesel, the mass of PAHs decreased apparently, especially Pyr, FL and PA, while the toxicity changedlittle.