| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for reliquefying BOG (boil-off gas), in which nitrogen gas can be separated/removed efficiently from the BOG, the amount of LPG, which is used for adjusting calorie, to be mixed can be reduced effectively and nitrogen gas can be removed by a separation and removal unit as small-sized as possible and to provide a method for removing nitrogen from the reliquefied BOG. SOLUTION: The apparatus 100 for reliquefying BOG is constituted so that the first BOG to be generated in an LNG storage tank 1 is introduced into a heat exchanger 2, withdrawn LNG is also introduced into the heat exchanger 2 from the LNG storage tank 1, the first BOG introduced into the heat exchanger 2 is cooled and reliquefied by the withdrawn LNG and the reliquefied BOG is sent to a vaporizer 3. A re-vaporization vessel 5 is arranged between the heat exchanger 2 and the vaporizer 3 so that second BOG is generated in the re-vaporization vessel 5 and sent to a nitrogen removal unit 6 through a line L3 to remove nitrogen gas in the second BOG. COPYRIGHT: (C)2010,JPO&INPIT |
