抄録
A feasibility study was made on the application of the waste edible oil-ethyl ester fuel to diesel engines. The waste edible oil methyl ester fuel is known as the fuel which emits clean exhaust gas. however, the waste edible oil ethyl ester fuel has not been investigated elsewhere. We prepared the waste edible oil ethyl ester fuel, and tried to apply it to diesel engines. In the experiment described in this paper, the waste edible oil-ethyl ester fuels with 30, 35 and 40% in weight of the ethyl alcohol were prepared in order to decide the amount of the alcohol. The lower calorific value, density, surface tension and kinematic viscosity of the waste edible oil-ethyl ester fuels were measured. It was found that the thermophysical properties of the waste edible oil-ethyl ester fuels are lower than the waste edible oil. In addition, the ignition temperature and the ignition time were measured and found that the ignitionability was improved by the esterification and all ethyl ester fuels are almost the same. Finally the waste edible oil-ethyl ester fuel was burned in a conventional 273-cc diesel engine. Although the specific fuel consumption was a little higher, the smoke scale and NOx in the exhaust gas were lower than the gas oil. Especially, the smoke scale of EE40 (made from 40% in weight of the ethyl alcohol) was reduced drastically, and it was less than half of the gas oil.
