The Effects of High Biodiesel Blend Ratios of Waste Plastic Pyrolysis Oil in ompression Ignition Engine Load
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Abstract
This work had three main objectives, to use waste plastic pyrolysis oil (WPPO) blends to determine the effects of high blend ratios on idling speed load in a diesel engine, the impact of high blend ratios of WPPO at low and intermediate engine conditions on brake specific fuel consumption (BSFC), also known as high idling condition. Lastly, the study aimed to find the effect of using high blend ratios of WPPO on engine performance and emission characteristics at high idling. The Findings show that at all engine loads (from idling to full load) the emissions of carbon monoxide (CO), unburnt hydrocarbon (UHC) and carbon dioxide (CO2) were low compared to conventional diesel (PD). However, the emissions of NOX were higher in all the high blend ratios compared to PD. The brake specific fuel consumption (BSFC) for the high ratio blends dropped while the brake thermal efficiency (BTE) increased with load for all high blend ratios until intermediate load, showing a decreasing trend in the values recorded. Notable results showed that WPPO high blend ratios had higher viscosity compared to PD. For example, CO emissions for blend ratio 80/WPPO20 at all engine idling, intermediate and high-speed modes were 345ppm, 365 ppm, 380 ppm, and 455 ppm while PD emissions were 270 ppm, 295 ppm, 315 ppm and 365 ppm respectively. The values for UHC for blend ratio 80/WPPO20 at all engine experimental modes were 34ppm, 26ppm, 21ppm, and 16ppm compared to PD fuel with 20 ppm, 25 ppm, 30 ppm, and 40 ppm respectively. The NOX emissions for PD fuel at all engine experimental modes were 175 ppm, 225 ppm, 300 ppm and 375 ppm compared to blend 80/WPPO20 at 215 ppm, 285 ppm, 378 ppm, and 475 ppm. The BSFC values for blend 80/WPPO5 at all engine experimental modes were 0.48 kg/kW.h, 0.41 kg/kW.h, 0.35 kg/kW.h and 0.4 kg/kW.h respectively, compared to PD at 0.45 kg/kW.h, 0.39 kg/kW.h, 0.33 kg/kW.h and 035 kg/kW.h respectively.