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Waste Cooking Oil (WCO): An Imperious Substitute Fuel for DI Diesel Engines

L. Karikalan and M. Chandrasekaran

The objective of this work was to optimize CI engine with WCO (waste cooking oil) biodiesel as fuel through experimental investigation through brake power, fuel economy and smoke emissions. Performance and discharge features were studied using the different WCOB blends and standard diesel. The result shows that the maximum BTE for WCOB 40 at maximum load is 34.48%, which is 2.9% more than diesel fuel. High BSFC noticed for higher percentage of WCO blends due to lower heating value, density and viscosity of the fuel. The exhaust gas temperature attained for diesel is 306oC at maximum load, whereas for WCOB20 and WCOB40 blends it is 278oC and 263oC. The HC emission for WCO blends increases with rise in load. WCOB20, WCOB60, WCOB80 and WCOB100 produce less HC emissions than WCOB40 and diesel. The CO emission of WCOB40 is closer to diesel, moderate at medium load and higher at part loads. CO2 emission for WCOB blend is lesser than diesel due to incomplete combustion and inadequate supply of oxygen at high load. The NOX emission for diesel and WCOB40 are 642 ppm and 428 ppm, respectively at part load. The smoke opacity features for diesel and WCOB100 are small and upper in the case of all other WCOB blends. From this study, it is clear that WCOB could replace the fossil fuel in the case of shortages in the near future.