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الثلاثاء، 5 أغسطس، 2014

New Design Approaches for Propulsion System for Liquefied Natural Gas Carriers


Author        : Walid Mohamed Bahgat
Degree        : M.Sc. Marine
Title: New Design Approaches for Propulsion System for Liquefied Natural Gas Carriers
 Abstract
Throughout the history of LNG marine transportation, the key challenge too often has been how to select the best propulsion system. In this research, study the effect of changing the prime mover of LNG carrier with other propulsion alternatives and discuss in details the effect of replacing steam turbine with other prime movers at the same power. Also, the research will include comparison between steam turbine, slow speed diesel engine, gas turbine, combined diesel and steam cycle and combined gas and steam cycle with respect to the thermal efficiency, specific fuel consumption and the specific fuel consumption by using boil-off gas of each one in order to apply the best propulsion system for LNG carrier.In conclusion, it could be noticed that the steam turbine and gas turbine propulsion systems are almost equal in thermal efficiency. After words, there is a slight increase in thermal efficiency by applying the combined cycle gas and steam. Moreover, by using diesel engine propulsion system the thermal efficiency went up to 52.26 and the thermal efficiency value of the combined cycle diesel and steam climbed to 58.36 which is the highest point. Finally, by knowing the fuel consumption for each propulsion system, it can be determine which one is the best propulsion system in order to be selected to apply it instead of the steam turbine propulsion system.

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