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    Energy recovery from waste plastic oils as an alternative fuel source and comparative assessment of engine characteristics at varying fuel injection timings
    (Pergamon-Elsevier Science Ltd, 2023) Mohan, Revu Krishna; Sarojini, Jajimoggala; Agbulut, Umit; Rajak, Upendra; Verma, Tikendra Nath; Reddy, K. Thirupathi
    The present study deals with the experimental results of diesel engine behaviors when using waste plastics oil blend (WPB) as a substitute at volumetrically 20%, 40%, and 100% to conventional diesel fuel. In order to conduct the engine testing, a direct-injection diesel engine with a typical 17.5 of CR and 210 bar was used (higher fuel injection pressure). In the current study, the load on the engine is altered from 0% to 100% at intervals of 25%, and the advanced fuel injection time (AFIT) is changed from 17.5 degrees to 25.0 degrees at intervals of 2.5 degrees. It is shown that the pursuit of optimal AFIT instants enhanced engine performance and permitted more advantageous energy conversions from waste plastics in comparison to those of conventional diesel. While it has been found that blending waste plastic oil with diesel at low concentrations improves engine combustion, performance, and production physiognomies, it has also been found that increasing the concentration of waste plastic oil in the test fuels has a negative impact on the engine characteristics. The WPB20D80 displays a maximum brake thermal efficiency of 26.1% at 22.5 AFITs and 1500 rpm, which is 2.6% higher than the WPB0D100. On the other hand, a reduction of 0.6% in brake-specific fuel consumption is noticed by WPB20D80. In contrast, diesel has a 2.6% higher NOx emission at 22.5 AFITs with 1500 rpm. WPB20D80 was found to have a reduction of 6.3% in smoke level when compared to diesel at 1500 rpm. In the conclusion, the present work shows that waste plastic oils at low concentrations can be used as a fuel substitute for diesel engines, and this case presents a promising solution to waste management.