生物資源由来燃料の含有酸素が排ガス再循環付加ディーゼルエンジンの排ガス特性に及ぼす影響

抄録

BDF (bio diesel fuel) is a vegetable oil-based diesel fuel which contains more oxygen than gas oil. The purpose of research so far was to grasp the effects of the feature of BDF. To this end, performance testing was performed in small diesel engines using gas oil and BDF. The testing confirmed no significant effect on NOX concentration with the use of BDF as compared to the use of gas oil. Elsewhere, it is considered that the oxygen contained in BDF promotes combustion, as PM (particulate matter) emission increases are suppressed in conditions where the oxygen concentration decreases. However, there is very little oxygen contained in BDF compared to the oxygen contained in the engine intake air. Therefore, the effect of the oxygen contained in BDF on the diesel engine exhaust gas components was examined. It was thus found that the BDF oxygen content affects the reduction of unburned fuel, which is particularly related to PM generation, due to changes in HC concentration, CO2 concentration in exhaust gas, and exhaust gas temperature.