Thermal flame spectroscopy of various diesel fuels and their blends with waste cooking oil through using coaxial burner

Abstract

Flame spectroscopy for conventional fuels and their blends with waste cooking oil (WCO) wasn’t carried out yet. In this research, WCO was blended with both light diesel oil (LDO) and heavy diesel oil (HDO) by 20% by mass, B1 and B2 respectively where no chemicals were added. Combustion processes were done by swirled vane burner inside and outside the water boiler at different heat loads. Axial plane flame temperatures were measured. The results showed that the highest peak thermal energy was achieved by HDO at all heat loads. Blend B2 produced lower heat energy than HDO by nearly average 7.5%. B2 produced lower heat energy transferred to water boiler than HDO by nearly 12.2%, 2.1%, 8.2 and 7.6% while B1 supplied 17%, 13.6%, 29.4% and 6.1% lower compared to LDO. LDO atoms are excited for long period along the flame length while WCO took short one. Both flame temperature and emission radicals of B1 were lower than that of LDO at the same condition and position. Fuel droplets size controlled the absorption of radiation energy for atom excitation.