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Stability of diesel-bioethanol blends for use in diesel engines

机译：用于柴油发动机的柴油-生物乙醇混合物的稳定性

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摘要

Bioethanol is an attractive fuel due to its renewable origin and its oxygen content, but it is unable to be used directly in diesel engines. Although biodiesel can be produced with bioethanol through ethanolisis, direct blending of ethanol and diesel fuel, called e-diesel, has at least the same potential to reduce particulate emissions, despite their much lower production cost. The main drawback is that ethanol is immiscible with diesel fuel over a wide range of temperatures, leading to phase separation. Consequently, in many cases the presence of a surfactant and cosolvent additive in the e-diesel blend becomes necessary. In this paper the conditions in which the e-diesel blends are stable have been studied. The stability of samples is affected by three factors mainly: temperature, water content and initial ethanol content. The results show that the presence of water in the blends, low temperatures and high ethanol contents favour the phase separation whereas the presence of the additive leads to the opposite effect. These effects have been quantified through level curve maps for stability and for separation time.
机译：生物乙醇由于其可再生来源和氧气含量而成为有吸引力的燃料，但不能直接用于柴油发动机。尽管生物乙醇可以通过乙醇化法与生物乙醇一起生产，但是乙醇和柴油的直接混合燃料（称为电子柴油）至少具有相同的减少微粒排放的潜力，尽管它们的生产成本要低得多。主要缺点是乙醇在很宽的温度范围内不能与柴油混合，导致相分离。因此，在许多情况下，在电子柴油混合物中必须存在表面活性剂和助溶剂添加剂。在本文中，已经研究了电子柴油混合物稳定的条件。样品的稳定性主要受三个因素影响：温度，水含量和初始乙醇含量。结果表明，共混物中水的存在，低温和高乙醇含量有利于相分离，而添加剂的存在导致相反的效果。这些效果已通过水平曲线图进行了定量，以确保稳定性和分离时间。

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