Effects of fuel properties on particulate emissions of diesel cars equipped with diesel particulate filters
Effects of fuel properties on particulate emissions of diesel cars equipped with diesel particulate filters
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DOI：
10.1016/j.fuel.2019.115879
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发表时间：
2019-11
期刊：
影响因子：
7.4
通讯作者：
A. Kontses;Athanasios Dimaratos;C. Keramidas;R. Williams;H. Hamje;L. Ntziachristos;Z. Samaras
中科院分区：
文献类型：
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作者：
A. Kontses;Athanasios Dimaratos;C. Keramidas;R. Williams;H. Hamje;L. Ntziachristos;Z. Samaras
本研究调查柴油燃料密度，十六烷值（CN），多环芳烃（PAH）和脂肪酸甲酯（FAME）含量的质量，粒径分布和化学成分的颗粒物排放的现代轻型车辆的效果。在一辆（非DPF）欧4和两辆配备DPF的欧5和6车辆的底盘测功机测试中，对十三种测试燃料与参考燃料进行了评估。所有车辆（包括两辆装有DPF的车辆）之间的颗粒物质量（PM）和颗粒数（PN）排放量存在统计学显著差异。燃油特性显著影响颗粒物排放和粒径分布，在几乎所有的情况下，欧4汽车，而很少有统计学上的显着趋势，观察到欧5和6车辆。高燃料密度降低了DPF汽车冷启动试验的PN排放量，而随着FAME含量的增加，在相同的循环中观察到欧6的PN增加。这些影响可归因于密度和FAME对发动机排放的影响以及再生后DPF过滤效率的后续增长率。在DPF中积累了足够的烟灰后，在热启动测试中没有观察到这些趋势。最后，PM的化学成分被发现是不敏感的燃料性能在所有车辆。这些结果表明，DPF在很大程度上掩盖了柴油燃料特性对颗粒物排放的作用，但仍有优化的空间，特别是在PN排放的车辆与频繁的再生。
The current study investigates the effect of diesel fuel density, cetane number (CN), polycyclic aromatic hydrocarbons (PAH) and fatty acid methyl ester (FAME) content on the mass, size distribution, and chemical composition of particulate matter emissions from modern light-duty vehicles. Thirteen test fuels were evaluated against a reference one on chassis dynamometer tests of a (non-DPF) Euro 4 and two DPF-equipped Euro 5 and 6 vehicles. Statistically significant differences in particulate mass (PM) and particle number (PN) emissions were observed between all vehicles, including the two DPF-equipped ones. Fuel properties significantly affected particulate emissions and size distribution in almost all cases of the Euro 4 car, while few statistically significant trends were observed for the Euro 5 and 6 vehicles. High fuel density decreased PN emissions of DPF cars over a cold-start test, while a PN increase was observed for the Euro 6 over the same cycle with increasing FAME content. These effects can be attributed to the impact of density and FAME on engine-out emissions and the subsequent rate of DPF filtration efficiency built-up, following regeneration. Those trends were not observed in hot-start testing after sufficient soot had accumulated in the DPF. Finally, PM chemical composition was found to be insensitive to fuel properties in all vehicles. These results imply that DPFs have to a large extent masked the role of diesel fuel properties on particulate emissions, but there is still room for optimization, especially in PN emissions of vehicles with frequent regenerations.