抄録
Effective utilization of waste bio-oil such as fried oil is important for development of low emission engine. Grease trap oil collected from private sewerage system is one of the waste bio-oil and is so dirty and high viscosity that direct applying to the engine is difficult. In this work, however, properties of diesel combustion using mixture of heavy oil and grease trap oil (GTO) was discussed although simply filtration of GTO was carried out. Moreover, environmental burden applying mixture of heavy oil and GTO to commercial diesel generation was investigated. Fuel supply of the mixture differed only slightly with variation of GTO composition. In case of relatively high electric load, the fuel supply decreased when the composition of GTO was more than 30 %. It is thought that the viscosity influences the characteristics of fuel injection. NOx and SO_2 emission decreased with increase in the composition of GTO. On the contrary, concentration of CO in exhaust gas also decrease. The properties of NOx emission give an indication of reduction in temperature with increase in the composition of GTO but that of CO emission shows improvement of combustion state. On the other hand, the properties of SO_2 emission were lower than estimation values calculated from sulfur contents of these fuels.
