Combustion and Emission Characteristics of Emulsified Biofuel Used for Diesel Engines

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Other Title
  • バイオエマルション燃料がディーゼル機関の燃焼と排気特性に及ぼす影響
  • バイオエマルション ネンリョウ ガ ディーゼル キカン ノ ネンショウ ト ハイキ トクセイ ニ オヨボス エイキョウ

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<p>In April 2018, the International Maritime Organization (IMO) adopted its Initial GHG Strategy, which defined goals for the international shipping sector to achieve by 2050: reducing CO2 emissions per transport work by 70% and total GHG emissions by at least 50% compared to 2008. As for SOx emissions from ships, the 0.5% global cap on the sulfur content of any fuel oil on board ships took effect on 1 January 2020. Biofuel is described as carbon neutral and, in general, has low levels of sulfur. For these reasons, it is expected to be more commonly used as a marine fuel in the future. However, biofuel emits more NOx from diesel engines, because its oxygen content is higher than that of gas oil. </p><p>In this study, the authors conducted experiments to see how the use of emulsified biofuel can contribute to reducing NOx emissions. The experiments were conducted in a small high-speed four-cycle diesel engine using Fatty Acid Methyl Ester (FAME) made from palm oil, gas oil, FAME-based and gas oil-based emulsion fuels, both of which contain 30% of water. The results found that the NOx reduction rate of the FAME emulsion fuel is higher than that of the gas oil emulsion fuel, and that ignition delay times for the FAME emulsion fuel are shorter than those of the gas oil emulsion fuel. </p>

Journal

  • Marine Engineering

    Marine Engineering 55 (5), 644-650, 2020-09-01

    The Japan Institute of Marine Engineering

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