2005 年 40 巻 6 号 p. 781-786
The exhaust gas emitted from the marine diesel engines creates air pollution problems. Also, the quantity of petroleum fuel resources is decreasing, so a substitute for conventional petroleum fuel is needed. The thermal heat efficiency of diesel engine is high when their compression ratios are higher. Various types of fuel are widely used in diesel engines. Such fuels as light oil (diesel oil), A-heavy fuel oil, recycled bio-oil (soybean oil), fish oil, and waste plastic oil are recently substituted for diesel fuel oil., so we investigated the resulting efficiency and combustion characteristics. S.F.C. (specific fuel consumption) and concentrations of O2, CO2, CO, and NOx in the exhaust gas were measured on loads of 10 to 50%. The properties and characteristics of each fuel are discussed as a substitute fuel of diesel engine.