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摘要
Iri order to investigate the size-resolved characteristics of diesel exhaust particles, four size bins particles were collected by electrical low pressure impactor from a diesel engine fueled with diesel and four oxygenated fuels and then studied by the thermogravimetric analysis. The results indicate that the higher oxygen content of fuel leads to the lower total particle and element carbon mass emission of the diesel engine. The element carbon mass fraction of the particles with the diameter of 0.03 similar to 0.10 mu m is lower than that of total particles for all five fuels, especially for high oxygen content fuels. The composition pattern of the particles with the diameter of 0.10 similar to 0.25 mu m and 0.25 similar to 0.99 mu m is similar with that of total particles, whose element carbon fraction decreases and high volatility fraction increases with the increasing fuel oxygen content. For the particles with the diameter of 0.99 similar to 2.46 mu m, the high volatility fraction is higher than that of other size bin particles. The derivative mass loss fraction curves of 4 size bins particles have 3 peaks, which is different from that of total particles having 2 peaks. The soot emitted from oxygenated fuels is easier to be oxidized than that from diesel for different size bin particles and total particles. The research is helpful to understand the interaction of diesel particles with the engine and particle trap.
