Variations in the chemical composition and morphology of soot induced by the unsaturation degree of biodiesel and a biodiesel blend
Variations in the chemical composition and morphology of soot induced by the unsaturation degree of biodiesel and a biodiesel blend
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DOI：
10.1016/j.combustflame.2011.10.011
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发表时间：
2012-03
影响因子：
4.4
通讯作者：
M. Salamanca;F. Mondragón;J. R. Agudelo;Pedro Benjumea;A. Santamaría
中科院分区：
文献类型：
--
作者：
M. Salamanca;F. Mondragón;J. R. Agudelo;Pedro Benjumea;A. Santamaría
这项工作是关于两种纯生物柴油及其混合物(体积分数为50%)中脂肪酸酯的分子结构对颗粒物排放的影响。试验在一台四缸直喷车用柴油机上进行，在严格控制的工作条件下，性能和排放的差异只受生物柴油组成和性质的影响。结果表明，生物柴油中甲酯的组成和不饱和度对排放颗粒物的化学组成有重要影响。观察到亚麻籽生物柴油(BL100)比棕榈油生物柴油(BP100)产生更多的PM和碳氢化合物(HC)，这是因为其组成中的不饱和化合物更多，这有利于碳烟前体在燃烧区的形成。热重分析(TGA)表明，生物柴油的碳烟中挥发性物质的含量略低于柴油，但不同生物柴油的挥发性物质含量没有显著差异。同样，颗粒物中存在的挥发性物质的碳氢化合物(在文献中称为SOF可溶有机部分)的化学特征表明，随着脂肪酸甲酯不饱和度的增加，脂肪成分增加。此外，研究还发现，即使纯生物柴油的不饱和度有很大的不同，但它们的纳米结构并没有显著的差异。
This work is about the influence of the molecular structure of the fatty acid esters present in two neat biodiesel fuels and their blend (50% by volume) on particulate matter emission. Experiments were performed in a four-cylinder direct injection automotive diesel engine under carefully controlled operating conditions, so that the difference in performance and emissions were affected only by biodiesel fuels composition and properties. The results indicated that the composition and degree of unsaturation of the methyl ester present in biodiesel plays an important role in the chemical composition of particulate matter (PM) emitted. It was observed that linseed biodiesel (BL100) produces more PM and hydrocarbons (HC) than Palm biodiesel (BP100) as a consequence of more unsaturated compounds in its composition, which favor the soot precursor’s formation in the combustion zone. Thermogravimetric analysis (TGA) showed that the amount of volatile material in the soot from biodiesel fuels was slightly lower than that of diesel fuel, but not significant differences were observed among biodiesels. Similarly, the chemical characteristics of the hydrocarbons of volatile material present in the particulate matter (referred in the literature as SOF-soluble organic fraction), showed an increase in the aliphatic component as the unsaturation degree of the fatty acid methyl ester increased. Additionally, it is concluded that there are not significant nano-structural differences in the soot obtained from pure biodiesel fuels, even if they have very different degrees of unsaturation.