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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