生物資源由来燃料を用いたディーゼルエンジンにおいてEGRが排ガス特性に及ぼす影響

抄録

The effects that Bio Diesel Fuel (BDF) has on the state of combustion and the exhaust gas characteristic of diesel engines are not clear. Previous performance test of the diesel engine using BDF has shown that the PM exhaust characteristic has been improved through increased net thermal efficiency with a larger fuel supply and a rise in fuel injection pressure. However, the NO_X density in the exhaust gas increased in that case as well with the rise of combustion temperature. In this research, effective Exhaust Gas Recirculation (EGR) for NO_X decrease is applied and the effect on exhaust gas characteristics of the engine is investigated. The results make it clear that superior exhaust gas characteristics during BDF use can be obtained in comparison to the use of gas oil, in operating conditions with a decreased excess air factor.