Study of alternate engine propulsion systems to reduce Co2 emissions from coastal ships

Abstract

This paper looks into the various engine propulsion systems like conventional reciprocating engines with HFO/LNG dual fuels, direct/electric propulsion with emphasis on reducing CO2 emissions from coastal ships. LNG is quickly emerging as a strong alternative to HFO because 20-30% reduction of CO2 can be achieved using this fuel. This paper also looks into the necessity for considering LNG for coastal shipping. A technical analysis is carried out for the additional expenditure incurred in way of the additional/alternate equipment and the benefits due to complying with IMO’s Tier II and III requirements (no need to install any other emission cleaning equipment 􀃆expenditure saved), reduced carbon foot print, reduced maintenance costs, increase in the thermal efficiency of the engine, etc. Carbon dioxide emissions from all alternatives are also presented.