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Predicting cetane number, kinematic viscosity, density and higher heating value of biodiesel from its fatty acid methyl ester composition

机译:从脂肪酸甲酯的组成预测生物柴油的十六烷值,运动粘度,密度和较高的热值

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摘要

Biodiesel is a renewable bio-fuel derived from natural fats or vegetable oils, and it is considered as a promising alternative to substitute diesel fuels. Cetane number, viscosity, density, and higher heating value are important properties to affect the utilization of biodiesel fuels, because they are involved in the definition of fuel quality and are required as input data for predictive engine combustion models. This work presents the characterization of two biodiesel samples made from beef tallow and soybean oil through their fatty acid methyl esters (FAMEs) profile. Empirical equations were developed to estimate four physical properties of methyl esters; and an average absolute deviation (AAD) of 5.95%, 2.57%, 0.11% and 0.21% for the cetane number, kinematic viscosity, density, and higher heating value were founded. Cetane number, viscosity, and higher heating value increases because of the increase of molec ular weight and these physical properties decrease as the number of double bonds increases. Unlike that of above properties, density decreases as molecular weight increases and density increases as the degree of unsaturation increases. Two general mixing rules and five biodiesel samples were used to study the influence of FAMEs over the physical properties of biodiesel. The prediction of the cetane number, kine matic viscosity, density and higher heating value of biodiesel is very close to the experimental values.
机译:生物柴油是一种源自天然脂肪或植物油的可再生生物燃料,被认为是替代柴油燃料的有前途的替代品。十六烷值,粘度,密度和较高的发热量是影响生物柴油燃料利用的重要属性,因为它们参与了燃料质量的定义,并且是预测性发动机燃烧模型的输入数据。这项工作通过其牛油脂肪酸和大豆油的脂肪酸甲酯(FAMEs)图谱表征了两种生物柴油样品的特性。建立了经验方程以估算甲基酯的四种物理性质。十六烷值,运动粘度,密度和较高的热值的平均绝对偏差(AAD)为5.95%,2.57%,0.11%和0.21%。十六烷值,粘度和较高的发热量由于分子量的增加而增加,并且这些物理性质随着双键数目的增加而降低。与上述特性不同,密度随着分子量的增加而降低,密度随着不饱和度的增加而增加。使用两个通用混合规则和五个生物柴油样品来研究FAME对生物柴油物理性质的影响。生物柴油的十六烷值,运动粘度,密度和较高发热量的预测与实验值非常接近。

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