Abstract
To meet stringent nitrogen oxides (NOx) regulations, a miller cycle with high-pressure turbo-charging is applied to all Niigata-manufactured four stroke diesel engines. At the same time, injection rate and compression ratio are optimized. In this paper, a practical study of NOx emission reduction for low-speed diesel engines is introduced. NOx reduction was attained through thermodynamic simulation as well as engine tests. Such technical countermeasures which are described in this paper are applied to all Niigata marine diesel engines and comply with IMO tier II.
