The Performance of the Diesel Engine by the Biomass Fuel and a Study about the Exhaust Characteristic(Thermal Engineering)

Although some countries use esterificated fuel, which is made out of useless vegetable oil, it makes troubles which are emission of white and black smoke, becoming worse of engine start, and so on. Since biofuels are oxygenated fuels, there are concerns abous production of large amounts of aldehydes, which are oxygenated toxic substances. This paper examines the cause of precipitation of solids in fuel at low temperatures, looks at trends in production of aldehydes from biofuels, compares exhaust characteristics when using 3 types of biofuel and gas oil in a diesel engine, and clarifies what effect constituent fatty acids have on exhaust characteristics. As the percentage of saturated fatty acids increases, the cloud point and freezing point rise, and a certain degree of correlation is evident between the cloud point and freezing point. With methyl oleate, production of aldehydes begins to increase around 400, and the produced amount is small in the low temperature range. With methyl ester fuels, there is an increase in NO_x and a decrease in THC, CO and exhaust smoke density, compared to gas oil.