Effects of CO Nanoparticles on the HCCI Engine Fueled with Low-Viscous Alcohol Fuel Blended with Tire Pyrolysis Oil

Abstract

This study focuses on the effects of alcohols on emission, combustion and performance characteristics of a homogeneous charge compression ignition (HCCI) engine operating in the dual fuel mode. The primary fuel was tire pyrolysis oil (TPO) and secondary fuel was alcohols (pentanol). Because of its higher oxygen content, the CO nanoparticle concentration was set at 5 ppm as the constant for each blend in the study. The TPO was extracted by the pyrolysis process and 20% of TPO was blended with varying proportions of pentanol as 5%, 10% and 15% respectively. The brake thermal efficiency of the blend B20 + 5 ppm CO + 15% pentanol was increased by 9% when compared with that of B20 + 5 ppm CO + 5% pentanol, due to the addition of nanoparticles with higher oxygen content. The brake specific fuel consumption of the blend B20 + 5 ppm CO + 15% pentanol showed an increased fuel consumption of approximately 9.5% than pure diesel. The blend B20+5 ppm CO + 15% pentanol showed a 27% decrement in the CO emission when compared to pure diesel. The NOx emission of blends B20 + 5 ppm CO + 5% pentanol was 3.44% lesser when compared to the conventional diesel engine. The drop in unburnt hydrocarbon (UBHC) was 16% for the blend B20 + 5 ppm CO + 15% pentanol when compared with the remaining blends. This was due to the addition of a nano-additive with pentanol.