Análise de gases de combustão de um motor de ignição por compressão utilizando biodiesel de óleo de macaúba

Abstract

The combustion and emission characteristics of a diesel engine are influenced by the fuel spray characteristics and by the atomization as well as by the fuel properties. The aim of this work was to evaluate the exhaust emissions of a diesel engine when fueled with macaw palm oil biodiesel and different proportions of blends of this biodiesel with metropolitan diesel fuel. The engine performance was evaluated too. For the tests, a Valtra A950 tractor with a AGCO Sisu Power 420DS diesel engine was used. For the emissions the ABNT NBR 14489 Standard was adopted and for the engine performance test the ABNT NBR ISO 1585 Standard was adopted. The opacity values were lower when using biodiesel blends than when diesel fuel. HC values were lower when using a blend of 20% of biodiesel and 80% of diesel fuel, CO2 values were higher and O2 values were lower when using 100% of biodiesel compared to the values when using diesel fuel. The engine power when fueled with macaw palm oil biodiesel blends was lower 18,4 % in average than when it was fueled with diesel fuel. The torque values were in average 17,4 % higher when the engine was fueled with diesel fuel in relation to when using biodiesel blends. In Brazil, nowadays, according to the law, metropolitan diesel fuel is composed of 7% of biodiesel and 93% of diesel fuel (B7).