Technologies to Comply with Exhaust Emission Regulation Using Alternative Marine Fuels

Abstract

The use of alternative marine fuels such as methane, ethane, methanol, ethanol, LPG and DME has been highlighted as a means to comply with the exhaust gas emission regulation (MARPOL Annex VI). Recently, two kinds of 2-stroke dual-fuel marine diesel engines that use such alternative marine fuels, namely, the Mitsui-MAN B&W ME-GI engine and the Mitsui-MAN B&W ME-LGI engine, came into market. This paper explains the design features and measurement results of both Mitsui-MAN B&W ME-GI and ME-LGI engines. Lower NOx emissions have been obtained when using such alternative fuels, and with further performance optimization a reduction in fuel consumption was achieved.