Lng production in cryogenic natural gas processing plants

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

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

Patent

CA 2204149

A method and system for liquifying natural gas using a cryogenic process is described. The method is well suited high methane purity natural gas which can be used as a vehicle fuel. The invention utilizes residue gas (210) from a cryogenic plant (1) as a natural gas feedstock. The natural gas feedstock is condensed by heat exchange with the overhead gas (208) from the demethanizer (60) of the cryogenic plant (1). In the preferred embodiment of the invention the pressure of the condensed natural gas is reduced to a level at which it can be readily stored and transported by expansion through one or more Joule- Thomson valves (92, 94, 96).

Un procédé et un système servent à liquéfier du gaz naturel par un processus cryogénique. Le procédé convient bien au gaz naturel très pur à haute teneur en méthane qui peut être utilisé comme carburant de véhicules. L'invention utilise le gaz résiduel (210) d'une usine cryogénique (1) comme gaz naturel d'alimentation. Le gaz naturel d'alimentation est condensé par échange de chaleur avec le gaz de tête (208) du déméthaniseur (60) de l'usine cryogénique (1). Dans le mode préféré de réalisation de l'invention, on réduit la pression du gaz naturel condensé jusqu'à un niveau qui permet de le stocker aisément et de le transporter par expansion à travers une ou plusieurs soupapes de Joule-Thomson (92, 94, 96).

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