舶用4サイクル中速ディーゼル機関における高硫黄分燃料の燃焼及び排出ガス特性

抄録

The amount of sulfur in fuel directly affects the emission of SOx from diesel engines. It also has an effect on the engine performance and emissions of PM, NOx and others. The object of this study is to investigate the influence of sulfur concentration in a medium-speed engine, which is being used as a main engine or dynamo engine in a lot of ships. The fuel used is of the high sulfur containing substance DBDS (Di-tert-butyl Di-sulfide) at various rates in the same “A” heavy oil. The following results were obtained. As the amount of sulfur concentration increases, the brake fuel consumption ratio increases, causing increase of SO₂, decrease of NOx and no change of CO₂, O₂ and CO. ISF increases almost linearly, and though SOF shows a upward tendency at low load, it does not change at normal 75% load. Therefore PM which is the sum of ISF and SOF increases through 25 to 75% load.