Exhaust Emissiosn and Performance of Diesel Engine Operating on Waste Food-Oil

Abstract

We experimentally evaluate a performance and exhaust emissions of a single-cylinder, fourstroke direct injection diesel engine operating on diesel fuel containing 50 and 60% volume waste food-oil(blended oil)and also a transesterified vegetable oil(TVO). The combustion characteristics and emissions such as NO_x, CO, HC, HCHO and smoke are compared with data for the case of JIS #2 diesel fuel. We found that(i)the NO_x emissions are similar for blended oil and TVO, though the NO_x with diesel fuel is lower compared to blended oil. The HC and HCHO emissions are similar for all fuels at all load conditions, (ii)smoke emissions are lower with the waste food-oil and much lower with TVO compared to diesel fuel in the whole engine operating range, and (iii)carbon deposits on cylinder head are observed after 400 hours running. Also discussed are the usability of the blended oil and TVO as alternative fuel, as well as availability for a treatment process of the waste food-oil.