中文摘要：

为研究氧化催化转化器(DOC)对柴油机燃用不同调合生物柴油(B0、B10、B20)后排气颗粒物粒径分布及组分的影响规律,利用MOUDI对颗粒物进行分级采样,对分级颗粒称重得到质量浓度分布,利用热重分析仪分析颗粒物热重特性及组分变化.结果表明:未加装DOC时,随着生物柴油比例的增加,各粒径级颗粒物质量浓度均降低,B20降幅最大;颗粒物质量浓度峰值范围内的粒径大小处于0.18~0.32μm,SOF质量分数依次升高,无机盐和Soot质量分数依次降低.加装DOC后,颗粒物质量浓度降低,DOC对粒径大于1μm颗粒转化效果不明显,聚集态颗粒质量浓度转化效率明显高于粗粒子态颗粒,B20聚集态转化效率最高,可达61.6%.随着转速的升高,转化效率明显降低,颗粒中SOF质量分数降低,H2O、Soot、无机盐质量分数均增大.

英文摘要：

In order to reveal the effects of diesel oxidation catalyst(DOC)on size distribution and components ofparticulate matter emitted from diesel-biodiesel dual fuel(B0,B10,B20),an experimental study was carried on a dieselengine.Particle samples from different size grades were got from MOUDI and distribution of the mass concentration wasobtained by weighting the particle.Beside,thermogravimetric characteristics of particle and varieties of components wereanalyzed by using thermogravimetric analyzer.Results showed that with the increase of biodiesel percentage,the massconcentration of every size grade decrease and it was especially obvious when B20was used.The mass concentration peakvalue of particulate matter emitted from three fuels all range from0.18μm to0.32μm.In addition,with the increasementof biodiesel percentage,the mass concentration of SOF increased while mineral salt and soot decreased.When DOC wasused,the mass concentration of particulate matter decreased and the convert efficiency was not evident for particle above1μm.The convert efficiency of accumulation state particles higher than that of coarse particle.Moreover,with theincreasing of speed,the mass concentration of SOF decreased,while H2O,soot and mineral salt increased.