Mixed refrigerant liquefaction process

Details Mixed refrigerant liquefaction process Mixed refrigerant liquefaction process

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 1/00 (2006.01)

Patent

CA 2567052

A method for liquefying a natural gas stream is provided. In one embodiment, the method includes placing a mixed component refrigerant in a heat exchange area with a process stream; separating the mixed component refrigerant at one or more pressure levels to produce a refrigerant vapor and a refrigerant liquid; bypassing the refrigerant vapor around the heat exchange area to a compression unit; and passing the refrigerant liquid to the heat exchange area. In another embodiment, the method further includes partially evaporating the refrigerant liquid stream within the heat exchange area to retain a liquid fraction of at least 1% by weight.

L'invention concerne un procédé de liquéfaction de flux de gaz naturel. Selon une variante, on place un réfrigérant à composants mixtes dans une zone d'échange thermique en contact avec un flux de traitement ; on sépare le réfrigérant à un ou plusieurs niveaux de pression pour donner une vapeur réfrigérante et un liquide réfrigérant ; on dérive la vapeur autour de la zone d'échange thermique vers une unité de compression ; et on transfère le liquide vers la zone d'échange thermique. Selon une autre variante, on évapore partiellement le flux liquide dans la zone d'échange thermique pour maintenir une fraction de liquide d'au moins 1 % en poids.

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