PURPOSE: To effectively utilize the energy of the evaporated gas as a portion of the propulsion power by driving a propulsion assisting electric motor by combusting the generated gas generated in an LNG cargo tank in an LNG heavy oil type mixed combustion type auxiliary boiler.
CONSTITUTION: A main engine for propelling an LNG transport vessel is an oil-burn type main Diesel engine 1. The evaporated gas generated in an LNG cargo tank is combusted in a mixed combustion type auxiliary boiler 2. When the boiler 2 can not feed LNG, heavy oil combustion is carried out. In a steam turbine power generator 6, a turbine is driven by using the steam generated in the boiler 2, and electric power is generated. The electric power is supplied into all regions of a vessel, and the excessive electric power is supplied into a propulsion assisting electric motor 7 through a controller 8. The controller 8 performs the control for feeding electric power having the cycle suitable for the electric motor 7. The electric motor 7 is directly connected with a main shaft 5, and driven by the electric power generated in the power generator 6, and the load of the main Diesel engine 1 is reduced by the output portion of the electric motor 7. Accordingly, the energy of the evaporated gas is effectively utilized as a portion of the propulsion power.
HIGUCHI TETSURO
MIYAGAWA KOICHI
