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<p>Biodiesel is typically produced through the transesterification of various feedstocks, including animal fats, plant oils, algae, and even used cooking oil. This process effectively utilizes natural resources and helps mitigate the issues of depleting oil reserves and environmental pollution. The current study considered the biodiesel production from <i>Scenedesmus</i> sp. microalgae and evaluated its fuel as an alternative to diesel in running diesel engines. Characteristics such as performance and emissions were evaluated for a 4-stroke, 4-cylinder diesel engine with algal biodiesel blended at 20% (A20) and 30% (A30) by volume with diesel. The engine speed was constant at 2500&#xa0;rpm, although load conditions varied from zero to full load. The data analysis demonstrated that at lower loads, brake thermal efficiencies of A20 and A30 blends were 3.1% and 6.3% lower than diesel, respectively. However, at higher loads, the efficiencies of the biodiesel blends, mainly A20, approached those of diesel. The biodiesel blends peak pressure was found to be slightly higher than the diesel fuel due to enhanced oxygen content. Similarly, the rate of heat release during premixed combustion improved due to a shorter ignition delay. Emissions were also observed to be reduced significantly, such as NOx reduced by 12.1% for A20 and by 7.26% for A30, while smoke emissions reduced by 36.7% and 58.9% for A20 and A30, respectively. In a nutshell, biodiesel from <i>Scenedesmus</i> sp. showed some promising results in engine performance and emissions as a diesel substitute.</p>

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Systematic evaluation of blends of biodiesel from Scenedesmus sp. on diesel engine performance metrics, combustion efficiency, and emission levels

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Suchit Deshmukh,
  • Ritunesh Kumar,
  • Kiran Bala

摘要

Biodiesel is typically produced through the transesterification of various feedstocks, including animal fats, plant oils, algae, and even used cooking oil. This process effectively utilizes natural resources and helps mitigate the issues of depleting oil reserves and environmental pollution. The current study considered the biodiesel production from Scenedesmus sp. microalgae and evaluated its fuel as an alternative to diesel in running diesel engines. Characteristics such as performance and emissions were evaluated for a 4-stroke, 4-cylinder diesel engine with algal biodiesel blended at 20% (A20) and 30% (A30) by volume with diesel. The engine speed was constant at 2500 rpm, although load conditions varied from zero to full load. The data analysis demonstrated that at lower loads, brake thermal efficiencies of A20 and A30 blends were 3.1% and 6.3% lower than diesel, respectively. However, at higher loads, the efficiencies of the biodiesel blends, mainly A20, approached those of diesel. The biodiesel blends peak pressure was found to be slightly higher than the diesel fuel due to enhanced oxygen content. Similarly, the rate of heat release during premixed combustion improved due to a shorter ignition delay. Emissions were also observed to be reduced significantly, such as NOx reduced by 12.1% for A20 and by 7.26% for A30, while smoke emissions reduced by 36.7% and 58.9% for A20 and A30, respectively. In a nutshell, biodiesel from Scenedesmus sp. showed some promising results in engine performance and emissions as a diesel substitute.