| Summary: | For the continuous reduction of the anthropogenic CO2 large diesel engines require the use of alternative fuels such as oxygenated renewable biofuels. These types of fuels will help in fulfilling future standards of regulated pollutant emissions for industrial, railways or marine applications In this sense, a theoretical investigation has been carried out on a four-stroke large marine diesel engine (nominal power of 2870kW at the rated speed of 1100 rpm). Different mixtures were investigated different mixtures of diesel–ethanol with ethanol volumetric fractions of 5%, 15%, 30%. The same ethanol fractions have been considered while replacing the diesel fuel with biodiesel B20 (20% rapeseed biofuel and 80% diesel fuel in volumetric fractions). The study covers two engine operating conditions characterized by full-load operation at the rated speed of 1100rpm and at mid-speed of 700rpm. It was found that a reasonable compromise can be achieved for an acceptable loss in power of 5% by using the diesel–ethanol15 mixture, which reduces NOx by 9.69%. Using the B20–ethanol05 mixture, will reduces Soot by 19.28% but increases NOx by 21.94% at low speed 700 rpm. At a high engine speed of 1100rpm, for the same both fuels diesel–ethanol15 and B20–ethanol05, Soot increases by 7.84% while NOx decreases by 10.91%, respectively Soot decreases by 17.65% and NOx increases by 37.27%.
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