Emissions from Marine Engines and NOx Reduction Methods

Abstract

The main theme of this paper is to analyze emissions from marine engines and the process of pollutant formation. As current legislation is more restrictive about nitrogen oxides (NOx), special attention was given to these components. In this regard, a state of the art of the most important NOx reduction methods is given and the conclusions of the main studies are exposed. It was concluded that the most efficient method in NOx reduction is SCR (selective catalytic reduction). Nevertheless, for marine engines there are more appropriate alternatives such as exhaust gas recirculation and water addition because these measures are less expensive, complex and bulky.