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Effect of waste plastic oil diesel blend on variant injection pressure of a diesel engine

Effects of mixing waste plastic oil (WPO) with diesel on the performance of diesel engine have been studied. The waste plastic oil was extracted through catalytic cracking process using lignite fly ash as a catalyst. The cat/pol ratio used was 0.1 so that maximum oil could be obtained. Waste plastic oil (WPO) from low density poly ethylene (LDPE) was blended with diesel in the following proportion such as 25%, 50% and 75%. Blends are designated as B25, B50 and B75. The physical properties of fuel blends were found through IS standards and compared with conventional diesel. The investigation was carried out in a single cylinder, water cooled, four stroke Kirloskar TV 1 engine and coupled with an eddy current dynamometer as loading device. This study was carried in two stages. In stage I, the blends were tested on a diesel engine for various load conditions to analyse the performance and emission attributes. From the results it was observed that B25 has the performance and emission attributes very close to sole fuel. In stage II, the investigation was done using optimum blend of B25 by varying the injection pressures from customary pressure 220 bar to 210, 230 and 240 bar and comparing with diesel at customary injection pressure of 220 bar. From this study it was found that for B25 with 240 bar injection pressure, the brake thermal efficiency was increased and SFC was gradually decreased. The emission such as CO, HC and smoke density are decreased by 12, 13.37 and 6.32 %. The NOx emissions increase by 6.3% when compared to diesel.