Lng production in cryogenic natural gas processing plants

F - Mech Eng,Light,Heat,Weapons – 25 – J

Patent

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Details

F25J 1/00 (2006.01) F25J 3/00 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2516785

A process for liquefying natural gas in conjunction with processing natural gas to recover natural gas liquids (NGL) is disclosed. In the process, the natural gas stream to be liquefied is taken from one of the streams in the NGL recovery plant and cooled under pressure to condense it. A distillation stream is withdrawn from the NGL recovery plant to provide some of the cooling required to condense the natural gas stream. A portion of the condensed stream is expanded to an intermediate pressure and then used to provide some of the cooling required to condense the natural gas stream, and thereafter routed to the NGL recovery plant so that any heavier hydrocarbons it contains can be recovered in the NGL product. The remaining portion of the condensed stream is expanded to low pressure to form the liquefied natural gas stream.

L'invention concerne un procédé pour liquéfier du gaz naturel, en combinaison avec le traitement du gaz naturel pour récupérer des liquides du gaz naturel (LGN). Selon ce procédé, le flux de gaz naturel à liquéfier provient d'un flux dans l'installation de récupération de LGN et refroidi sous pression, de façon à le condenser. Un flux de distillation est retiré de l'installation de récupération de LGN pour fournir le refroidissement nécessaire à la condensation du gaz naturel. Une partie du flux condensé est expansé à une pression intermédiaire, puis utilisée pour produire le refroidissement nécessaire à la condensation du gaz naturel, puis dirigée vers l'installation de récupération de LGN, de sorte que les hydrocarbures lourds contenus dans le flux soient récupérés dans le produit LGN. La partie restante du flux condensé est expansée à basse pression pour former le flux de gaz naturel liquéfié.

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