Performance and Emission Analysis of CI Engine Fueled with Waste Cooking Biodiesel Blends at Different Compression Ratios

Biofuels can be considered as one of the alternative to replace the conventional liquid fuels partially as they can be used as blends in IC engines. Due to continuous use of petroleum sources in automobiles, it causes the depletion of world petroleum reserves, and it is expected to last for few years. Many active researches are in progress in finding the alternative for this conventional fuel. One of the alternative fuels whose use is rapidly growing is biodiesel. In the present work, biodiesel is produced from waste cooking oil which is obtained from local hotels and restaurants by using transesterification process. Various properties of diesel, biodiesel, and its blends are found. Experiments are carried out at various loads to study the performance of a single-cylinder, multi-fuel engine at two different compression ratios. The compression ratios used are 17.5 and 19.0. Different performance and emission parameters are evaluated for different blends and are compared with each other. Among all the results, B20 biodiesel blends show the best performance as compared to other biodiesel blends. And with 30% waste cooking oil biodiesel blend, lowest emissions of oxides of nitrogen (NO_x) were observed. For B20 blend, CO was reduced by 35%, CO₂ by 29.5%, and fuel consumption was reduced by 10%. Same time, 8.5% more in efficiency was observed. When B30 was used increased by 15.1%, fuel consumption reduced by 10%, and HC reduced by 20% and CO₂ was reduced by 16%.