Lng production using dual independent expander refrigeration...

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

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

Patent

CA 2439981

A process for producing a liquified natural gas stream that includes cooling at least a portion of a pressurized natural gas feed stream by heat exchange contact with first and second expanded refrigerants that are used in independent refrigeration cycles. The first expanded refrigerant is selected from methane, ethane and treated and pressurized natural gas. The second expanded refrigerant is nitrogen.

La présente invention concerne un procédé de production d'un flux de gaz naturel liquéfié comportant le refroidissement d'au moins une portion du flux d'alimentation de gaz naturel pressurisé par un contact d'échange thermique avec des premier et deuxième fluides caloporteurs détendus utilisés dans des cycles frigorifiques indépendants. Le premier fluide caloporteur est choisi parmi le méthane, l'éthane et le gaz naturel traité et pressurisé. Le deuxième fluide caloporteur est l'azote. FIG. 1 : A PRODUCTION DE GNL UTILISANT DES CYCLES FRIGORIFIQUES A DOUBLE DETENDEUR INDEPENDANT 92 ALIMENTATION DE METHANE 96 COMPRESSEUR DE RECYCLAGE DE METHANE 90 DETENDEUR DE METHANE 99 UNITE D'ELIMINATION D'AZOTE MOLECULAIRE 77 DETENDEUR DE LIQUIDE 82 ALIMENTATION D'AZOTE 86 COMPRESSEUR DE RECYCLAGE D'AZOTE 80 DETENDEUR D'AZOTE B PRODUIT DE GAZ NATUREL VERS STOCKAGE

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