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<p>This research examines the combustion, performance, and emission properties of a compression ignition (CI) engine powered by hydrogen–microalgae biodiesel dual-fuel blends (HORE) at different hydrogen flow rates and cold exhaust gas recirculation (EGR) rates. Three blends, namely H20M80, H30M70, and H40M60, were tested with hydrogen flow rates of 5, 10, and 15 LPM. Fixed pilot and main injection timings of 35 and 25°CA prior to top dead center (bTDC), respectively, were employed in all trials. The experiments were divided into two phases: Phase-<b>I</b> compared the baseline performance without EGR, and Phase<b>-II</b> tested the effect of cold EGR (5 and 10%) on higher hydrogen content blends (15 LPM). During Phase<b>-I</b>, both H30M70 and H40M60 demonstrated improved brake thermal efficiency (BTE), with H30M70 recording 1.03 and 1.20% improvement over diesel and algae biodiesel, respectively, and H40M60 recording 1.19 and 1.02%, respectively. HC and CO emissions were significantly lowered; however, this was accompanied by higher NOx emissions up to 1.57 and 1.62% for H30M70, and 1.07 and 0.97% for H40M60. During Phase<b>-II</b>, use of cold EGR showed that 5% EGR produced additional NOx increases, but 10% EGR substantially suppressed NOx emissions in both blends. A sustainability assessment study is done using Pugh matrix. The best fuel combination is ranked 1 and it is identified as H40M6015LPM with 5% exhaust gas recirculation.</p>

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Combustion and emission analysis of hydrogen–microalgae biodiesel dual-fuel CI engine with cold EGR

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • J. Jayakar,
  • N. Gunasekar,
  • P. V. Elumalai

摘要

This research examines the combustion, performance, and emission properties of a compression ignition (CI) engine powered by hydrogen–microalgae biodiesel dual-fuel blends (HORE) at different hydrogen flow rates and cold exhaust gas recirculation (EGR) rates. Three blends, namely H20M80, H30M70, and H40M60, were tested with hydrogen flow rates of 5, 10, and 15 LPM. Fixed pilot and main injection timings of 35 and 25°CA prior to top dead center (bTDC), respectively, were employed in all trials. The experiments were divided into two phases: Phase-I compared the baseline performance without EGR, and Phase-II tested the effect of cold EGR (5 and 10%) on higher hydrogen content blends (15 LPM). During Phase-I, both H30M70 and H40M60 demonstrated improved brake thermal efficiency (BTE), with H30M70 recording 1.03 and 1.20% improvement over diesel and algae biodiesel, respectively, and H40M60 recording 1.19 and 1.02%, respectively. HC and CO emissions were significantly lowered; however, this was accompanied by higher NOx emissions up to 1.57 and 1.62% for H30M70, and 1.07 and 0.97% for H40M60. During Phase-II, use of cold EGR showed that 5% EGR produced additional NOx increases, but 10% EGR substantially suppressed NOx emissions in both blends. A sustainability assessment study is done using Pugh matrix. The best fuel combination is ranked 1 and it is identified as H40M6015LPM with 5% exhaust gas recirculation.