Abstract
The amount of nitrogen oxide (NOx) emitted from marine diesel engines is limited by the regulation 13 of Annex VI of MARPOL 73/78. It is provided in the regulation that NOx emissions of marine diesel engines are to be checked when manufactured or installed or remodeled. This regulation seems to have been enacted on the assumption that the emissions have the maximum at manufacturing or remodeling and decrease with ship's ages.To confirm this, authors have measured NOx emissions of an actual vessel for five years. And, the changing trend in NOx emissions with ship's ages was examined based on the measured data. In addition, the relation between NOx emissions and engine parameters was investigated in order to determine what factors have a significant effect on NOx emissions.
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