Method for subcooling a lng stream obtained by cooling by...

Details Method for subcooling a lng stream obtained by cooling by... Method for subcooling a lng stream obtained by cooling by...

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 1/02 (2006.01)

Patent

CA 2604263

The invention concerns a method which consists in subcooling a LNG stream (11) with a coolant (41) in a first heat exchanger (19). Said coolant (41) is subjected to a closed refrigerating cycle (21). The closed cycle (21) comprises a phase for heating the coolant (42) in a second heat exchanger (23), and a phase for compressing the coolant (43) in a compression apparatus (25) up to a pressure higher than its critical pressure. It further includes a phase for cooling the coolant (45) from the compression apparatus (25) in the second heat exchanger (23) and a phase of dynamic expansion of part (47) of the refrigerating fluid derived from the second heat exchanger (23) in a turbine (31). The coolant (41) comprises a mixture of nitrogen and methane.

Dans ce procédé, on sous-ref roidit le courant de GNL (11) avec un fluide réfrigérant (41) dans un premier échangeur thermique (19). Ce fluide réfrigérant (41) subit un cycle de réfrigération (21) fermé. Le cycle fermé (21) comprend une phase de réchauffage du fluide réfrigérant (42) dans un deuxième échangeur thermique (23), et une phase de compression du fluide réfrigérant (43) dans un appareil de compression (25), jusqu'à une pression supérieure à sa pression critique. Il comprend en outre une phase de refroidissement du fluide réfrigérant (45) provenant de l'appareil de compression (25) dans le deuxième échangeur thermique (23) et une phase de détente dynamique d'une partie (47) du fluide réfrigérant issu du deuxième échangeur thermique (23) dans une turbine (31). Le fluide réfrigérant (41) comprend un mélange d'azote et de méthane.

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