Exergetic performance optimization and thermoeconomic analysis of a variable compression ratio diesel engine fueled with distilled plastic oil and diesel doped with nanographene

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Pub Date : 2024-02-07 DOI:10.1177/09544089241229563

Amar Kumar Das, Taraprasad Mohapatra

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Abstract

Due to the fast depletion of fossil fuels, enormous concerns about environmental pollution, and advocacy for waste-to-energy drives from the global perspective, compression ignition engines need a sustainable alternative fuel source. Enormous plastic wastes were generated in health sectors, particularly during post-pandemic. In this context, the study intends to introduce a reasonable solution for such waste plastics recycling by converting them into liquid oil by pyrolysis followed by the distillation process. Distilled waste plastic oil (DPO) extracted from medical plastic waste is a potential alternative diesel source. The performance of the engine significantly increases when nanographene is added with DPO/diesel blends, which act as a combustion improviser. The energy efficiency (η1), exergy efficiency (η2), and brake-specific fuel consumption (BSFC), which are regarded as key performance indicators, exhibited promising results when operated with 20% DPO +100 ppm nanographene (20DPO100G) emulsified fuel mixture as compared to normal diesel. When compared to diesel and other fuel combinations, the energy efficiency (η1) and exergy efficiency (η2) for 20DPO100G fuel mixture were found enhanced by 5.78% and 10.9%, respectively, and lowest by 14.7% for BSFC in comparison to diesel. The optimum energy efficiency, exergy efficiency, and minimum BSFC were obtained for the test engine from response surface methodology multi-objective optimization analysis as 31.44%, 22.12%, and 0.32 kg/kW-hr, respectively, for the composite desirability, D of 0.974. The 100 ppm nanographene emulsified distilled waste plastic pyrolysis oil and diesel blend has the lowest relative cost variation of −14.583.

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以蒸馏塑料油和掺杂纳米石墨烯的柴油为燃料的可变压缩比柴油发动机的能效优化和热经济分析

由于化石燃料的快速枯竭、对环境污染的巨大担忧，以及从全球角度倡导废物变能源，压燃式发动机需要一种可持续的替代燃料来源。卫生部门产生了大量塑料废物，特别是在大流行病后。在这种情况下，本研究打算为此类废塑料的回收利用引入一个合理的解决方案，通过热解后的蒸馏过程将其转化为液态油。从医疗塑料废弃物中提取的蒸馏废塑料油（DPO）是一种潜在的替代柴油来源。将纳米石墨烯添加到 DPO/柴油混合物中，可作为燃烧改进剂，从而显著提高发动机的性能。与普通柴油相比，当使用 20% DPO +100 ppm 纳米石墨烯（20DPO100G）乳化混合燃料时，能效（η1）、放能效率（η2）和制动油耗（BSFC）这些被视为关键性能指标的指标都表现出良好的效果。与柴油和其他燃料组合相比，20DPO100G 燃料混合物的能效（η1）和放能效（η2）分别提高了 5.78% 和 10.9%，而 BSFC 则比柴油低 14.7%。通过响应面方法多目标优化分析，在复合可取性 D 为 0.974 时，试验发动机的最佳能效、放能效率和最低 BSFC 分别为 31.44%、22.12% 和 0.32 kg/kW-hr。100 ppm 纳米石墨烯乳化蒸馏废塑料热解油和柴油混合物的相对成本变化最小，为 -14.583。

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Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering

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