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<p>The global energy crisis and environmental concerns have intensified the quest for alternative fuel sources, leading to the investigation of waste plastic oil (WPO) as a renewable energy resource. However, WPO’s lower cetane number and high viscosity present combustion challenges, necessitating innovative solutions, such as hydrogen enrichment and the optimization of injection timing. This study examines the impact of variations in injection timing (19°bTDC, 23°bTDC, and 25°bTDC) on the performance and emissions of a hydrogen-enriched WPO-diesel blend (B20) within a single-cylinder, four-stroke PCCI engine. The research utilizes (RSM) to assess (BTE), BSFC), and emissions comprising NOx, CO, HC, and smoke opacity. The results indicate that an injection timing of 23°bTDC yields the optimal balance, achieving a peak BTE of 45.2%, representing a 16.53% improvement compared to diesel, while maintaining moderate NOx emissions. Advancing the injection timing to 25°bTDC leads to an increase in NOx formation, whereas retarding it to 19°bTDC diminishes efficiency. These findings underscore the significance of precise injection timing in maximizing fuel efficiency and controlling emissions. Future research should endeavor to investigate higher levels of hydrogen enrichment and the application of exhaust gas recirculation (EGR) for further emission reduction while preserving high engine performance.</p>

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Physiochemical Analysis of Hydrogen-Enriched Waste Plastic Oil: Implications for Injection Timing and Combustion Efficiency

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Rakesh Varma Kadupu,
  • K. Syed Jafar,
  • P. V. Elumalai

摘要

The global energy crisis and environmental concerns have intensified the quest for alternative fuel sources, leading to the investigation of waste plastic oil (WPO) as a renewable energy resource. However, WPO’s lower cetane number and high viscosity present combustion challenges, necessitating innovative solutions, such as hydrogen enrichment and the optimization of injection timing. This study examines the impact of variations in injection timing (19°bTDC, 23°bTDC, and 25°bTDC) on the performance and emissions of a hydrogen-enriched WPO-diesel blend (B20) within a single-cylinder, four-stroke PCCI engine. The research utilizes (RSM) to assess (BTE), BSFC), and emissions comprising NOx, CO, HC, and smoke opacity. The results indicate that an injection timing of 23°bTDC yields the optimal balance, achieving a peak BTE of 45.2%, representing a 16.53% improvement compared to diesel, while maintaining moderate NOx emissions. Advancing the injection timing to 25°bTDC leads to an increase in NOx formation, whereas retarding it to 19°bTDC diminishes efficiency. These findings underscore the significance of precise injection timing in maximizing fuel efficiency and controlling emissions. Future research should endeavor to investigate higher levels of hydrogen enrichment and the application of exhaust gas recirculation (EGR) for further emission reduction while preserving high engine performance.