Abstract No.F171201-034

Author name(s): Youhei Takimoto, Shinya Yuasa, Nakata Takashi

Company: Mitsui E&S shipbuilding Co., Ltd., Japan

High pressure gas compressors and/or excess boil off gas (hereinafter: B.O.G.) handling systems, such as B.O.G. re-liquefaction system, are installed on LNG carriers propelled by the slow speed dual fuel diesel engine(s). Although slow speed dual fuel diesel engine itself achieves high efficiency, these gas compressors or re-liquefaction systems need large amount of electrical power. In this paper, it was investigated to hold all of the B.O.G. in the LNG tank. Estimation of tank pressure and temperature during voyage showed that 5 days B.O.G. holding can be available by MOSS type low pressure tank. It was found that the high pressure LNG pump system with B.O.G. hold achieves approximately 10% reduction of total energy consumption from the high pressure gas compressor system.

KEY WORDS: LNG carrier; MOSS tank; B.O.G. holding; fuel gas supply system; high pressure gas compressor; high pressure LNG pump; middle range trade

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