(19)
(11) EP 3 514 466 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.11.2019 Bulletin 2019/45

(43) Date of publication A2:
24.07.2019 Bulletin 2019/30

(21) Application number: 19150672.4

(22) Date of filing: 08.01.2019
(51) International Patent Classification (IPC): 
F25J 1/00(2006.01)
 F25J 1/02(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 17.01.2018 JP 2018005304

(71) Applicant: L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE
75007 Paris (FR)

(72) Inventors:
  • KHAN, Oumar
    94503 CHAMPIGNY SUR MARNE (FR)
  • HIROSE, Kenji
    KOBE, Hyogo 651-0087 (JP)
  • RANCHOUX, Maxime
    KOBE, Hyogo 651-0087 (JP)
  • JOLY, Loic
    KOBE, Hyogo 651-0087 (JP)

(74) Representative: Grout de Beaufort, François-Xavier 
L'Air Liquide Direction Propriété Intellectuelle 75, quai d'Orsay
75321 Paris Cedex 07
75321 Paris Cedex 07 (FR)

   


(54) BOIL OFF GAS RELIQUEFYING APPARATUS AND LNG SUPPLY SYSTEM PROVIDED WITH THE SAME


(57) Provided is a boil off gas reliquefying apparatus which is applicable to new and existing liquefied natural gas tanks, and attains an extremely inexpensive investment cost.
A boil off gas reliquefying apparatus has a first line (L10), a first heat exchanger (10) for heat-exchanging BOG, a first return line (LI2) that is branched from the first line (L10) in the first heat exchanger, and joins an intermediate position of a compression process line, an expander (13) that expands BOG which passes through a part of the first heat exchanger (10), a booster (14) that pressurizes BOG which is expanded by the expander (13) to pass through the first heat exchanger (10), a second heat exchanger (11) for heat-exchanging BOG which passes through the first heat exchanger (10), at least one expansion valve (16) for subjecting BOG which passes through the second heat exchanger (11) to free expansion to perform reliquefaction, and a gas-liquid separator (12) that separates BOG expanded by the expansion valve (16) into BOG and LNG.







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