Exergy-energy, and sustainability index assessment of oxy-acetylated enriched-TiO2-Scenedesmus obliquus biodiesel fuel blends in a diesel engine

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2025-03-12 DOI:10.1016/j.renene.2025.122870

Olusegun Stanley Tomomewo, Babalola Aisosa Oni

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Abstract

Biodiesel, prepared by transesterification of Scenedesmus-obliquus as a feedstock blended with acetylene-air at different flowrates is used to fuel a diesel engine. An Exergy-energy analysis compares baseline diesel at various engine design variables. The fuel samples were tested for sustainability, combustion efficiency, emissions, useful work energy, and engine performance, through exhaust gases in a Rainbow-186 Diesel engine at different loads. Data analysis provides optimal operating conditions for the efficient combustion of the fuel blends. Optimal performance was obtained at a compression ratio of 17.5 and injection pressure of 210 bar, with energy efficiency observed as 37.00 % for Scenedesmus-obliquus-biodiesel-TiO₂ +200g/h-acetylene-air which is the most suitable fuel blends relative to the diesel fuel at 30.9 %. The biodiesel-acetylene-air addition reduces the NOx, CO₂ and UHC emissions with an average of 17.23 %, 9.04 % and 12.77 % when compared with diesel fuel. While such reductions may demonstrate technological advancements, their real-world impact depends on operating conditions, which can vary significantly in practical applications. Under full load, the exergy efficiencies and sustainability index values of the blends are 6.83, and 1.57 % higher, compared to diesel at full load. The highest sustainability index for the fuel blends is 1.6 at 100 % engine load in Scenedesmus-obliquus-biodiesel-TiO₂ +200 g/h acetylene-air fuel.

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生物柴油的制备方法是以 Scenedesmus-obliquus 为原料，与乙炔-空气以不同的流速混合后进行酯交换反应，用于柴油发动机的燃料。能耗分析比较了不同发动机设计变量下的基准柴油。在不同负荷下，通过 Rainbow-186 柴油发动机中的废气，对燃料样本的可持续性、燃烧效率、排放量、有用功能和发动机性能进行了测试。数据分析为混合燃料的高效燃烧提供了最佳操作条件。在压缩比为 17.5 和喷射压力为 210 巴的条件下，生物柴油-二氧化钛 +200 克/小时乙炔-空气混合燃料获得了最佳性能，能量效率为 37.00%，与 30.9%的柴油相比，这是最适合的混合燃料。与柴油相比，生物柴油-乙炔-空气混合燃料平均减少了 17.23%、9.04% 和 12.77%的氮氧化物、二氧化碳和 UHC 排放。虽然这种减排效果可以证明技术的进步，但其实际影响取决于运行条件，而实际应用中的运行条件可能会有很大差异。在满负荷情况下，与柴油相比，混合燃料的放能效率和可持续性指数值分别高出 6.83% 和 1.57%。在 Scenedesmus-obliquus-biodiesel-TiO2 +200 g/h 乙炔-空气燃料中，当发动机负荷达到 100%时，混合燃料的最高可持续性指数为 1.6。

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来源期刊

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

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