Reliquefaction of boil-off from liquefied natural gas

Details Reliquefaction of boil-off from liquefied natural gas Reliquefaction of boil-off from liquefied natural gas

1988-11-03

1989-07-04

Capossela, Ronald C.

Refrigeration

Storage of solidified or liquified gas

Controlled conversion of solidified gas to another phase

62 511, F17C 1300

Patent

active

048438294

ABSTRACT:
The present invention relates to an improved process for the reliquefaction of boil-off gas containing up to 10% nitrogen resulting from the evaporation of liquefied natural gas (LNG) contained in a storage vessel. In the process, a closed-loop nitrogen refrigeration cycle is utilized wherein the nitrogen is isenthalpically expanded under conditions for generating a liquid and vapor with the liquid being pressurized by pumping and warmed against an initially cooled boil-off stream. The boil-off LNG stream is initially cooled by indirect heat exchange with an isentropically expanded refrigerant stream.

REFERENCES:
patent: 3874185 (1975-04-01), Etzbach
patent: 3889485 (1975-06-01), Swearingen
patent: 3967938 (1976-07-01), Daeschler et al.
patent: 3970441 (1976-07-01), Etzbach et al.
patent: 4055961 (1977-11-01), Admiral
patent: 4267701 (1981-05-01), Toscano
patent: 4437312 (1984-03-01), Newton et al.
patent: 4766741 (1988-08-01), Bartlett et al.

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