(19)
(11) EP 1 959 217 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.08.2012 Bulletin 2012/31

(43) Date of publication A2:
20.08.2008 Bulletin 2008/34

(21) Application number: 07121837.4

(22) Date of filing: 29.11.2007
(51) International Patent Classification (IPC): 
F25J 1/02(2006.01)
 F17C 5/04(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 13.02.2007 KR 20070014682

(71) Applicant: DAEWOO SHIPBUILDING & MARINE ENGINEERING CO., LTD
Seoul 100-180 (KR)

(72) Inventors:
  • Yu, Jin Yeol
    656-050, Geoje-si, Gyeongsangnam-do (KR)
  • Park, Bong Woon
    656-220, Geoje-si, Gyeongsangnam-do (KR)
  • Kim, Hyun Jin
    502-774, Gwangju (KR)
  • Park, Hyun Ki
    656-806, Geoje-si, Gyeongsangnam-do (KR)

(74) Representative: Intès, Didier Gérard André et al
Cabinet Beau de Loménie 158, rue de l'Université
75340 Paris Cedex 07
75340 Paris Cedex 07 (FR)

   


(54) Apparatus and method for reliquefying boil-off gas capable of operating with variable refrigeration load


(57) The invention relates to an apparatus and a method for reliquefying boil-off gas in which the refrigeration load of a refrigeration system (20) can be changed when the reliquefaction load of the apparatus for reliquefying boil-off gas is changed. The boil-off gas reliquefaction apparatus according to the present invention, which supercools and reliquefies the boil-off gas generated in an LNG storage tank (1) by allowing the boil-off gas to pass through a cryogenic heat exchanger (11) via a boil-off gas discharge line (L1), and then to pass through a gas-liquid separator (13) installed at a rear end of the cryogenic heat exchanger (11), so as to return the boil-off gas to the LNG storage tank (1), is characterized in that the cryogenic heat exchanger (11) is connected to a refrigeration system (20) for compressing and expanding a refrigerant, in that the refrigerant system (20) comprises a multi-stage compressor (21a, 21b, 21c, 22a, 22b, 22c), an expander, (23) and a motor (M), and in that the motor is connected to an inverter (60).







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