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<p>Explored the combined impact of hydrogen (H<sub>2</sub>), nitrogen, and exhaust gas recirculation (EGR) with waste spent lubricant oil (WSLO) blended diesel on the performance, combustion, and emission characteristics of a Common Rail Direct Injection (CRDI) diesel engine under varying loads. H<sub>2</sub> has renewable properties, zero carbon emissions act as promising alternative energy sources and WSLO disposal solutions, such as sludge and wastewater, face practical issues owing to contamination and cost. Results show significant improvements in engine efficiency and emission reductions with optimized fuel blends. Addition of 25% H<sub>2</sub> to WSLO20 (20% WSLO with 80% diesel) achieved a peak brake thermal efficiency (BTE) of 44%, a 17.7% improvement over pure diesel (37.4%) at full load. Exhaust gas temperature also increased with hydrogen enrichment, reaching 483°C compared to 390°C (pure diesel). 13% nitrogen mixed with 25% hydrogen and 20% EGR achieved a 21% reduction in nitrogen oxide emissions compared to hydrogen and EGR-only configurations, although it increased hydrocarbon and carbon monoxide by 22% and 14.4%, respectively. Peak cylinder pressure rose to 74.63 bar with hydrogen addition, compared to 69 bar for pure diesel, indicating enhanced combustion performance. However, higher EGR and nitrogen levels diluted combustion, reducing BTE and increasing ignition delay. This work offers practical solutions for sustainable engine operation by mixing.</p>

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Combined impact of hydrogen fuel, nitrogen, and EGR with waste spent lubricant oil blended diesel on common rail direct injection diesel engine under varying loads

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  • 发表日期：

    2025年6月2日

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  • Abdulmuin M. Abdullah

摘要

Explored the combined impact of hydrogen (H2), nitrogen, and exhaust gas recirculation (EGR) with waste spent lubricant oil (WSLO) blended diesel on the performance, combustion, and emission characteristics of a Common Rail Direct Injection (CRDI) diesel engine under varying loads. H2 has renewable properties, zero carbon emissions act as promising alternative energy sources and WSLO disposal solutions, such as sludge and wastewater, face practical issues owing to contamination and cost. Results show significant improvements in engine efficiency and emission reductions with optimized fuel blends. Addition of 25% H2 to WSLO20 (20% WSLO with 80% diesel) achieved a peak brake thermal efficiency (BTE) of 44%, a 17.7% improvement over pure diesel (37.4%) at full load. Exhaust gas temperature also increased with hydrogen enrichment, reaching 483°C compared to 390°C (pure diesel). 13% nitrogen mixed with 25% hydrogen and 20% EGR achieved a 21% reduction in nitrogen oxide emissions compared to hydrogen and EGR-only configurations, although it increased hydrocarbon and carbon monoxide by 22% and 14.4%, respectively. Peak cylinder pressure rose to 74.63 bar with hydrogen addition, compared to 69 bar for pure diesel, indicating enhanced combustion performance. However, higher EGR and nitrogen levels diluted combustion, reducing BTE and increasing ignition delay. This work offers practical solutions for sustainable engine operation by mixing.