Integrated multiple-loop refrigeration process for gas...

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

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F25J 1/02 (2006.01)

Patent

CA 2519212

A gas (1) is liquefied by cooling successively through at least two temperature ranges by vaporization of respective refrigerants (117, 213 & 315) with additional refrigeration being provided by vaporization (357; 379), at temperatures above the highest temperature in the coldest heat exchange zone (312), of an auxiliary refrigerant (373, 377) derived from the refrigerant (315) vaporized in said zone (312). The auxiliary refrigerant may have the same composition as the refrigerant vaporized in the coldest 10 heat exchange zone but is vaporized at a different pressure or can have a different composition.

On peut liquéfier un gaz (1) par refroidissement au travers d'une succession d'au moins deux plages de températures, par vaporisation de réfrigérants respectifs (117, 213 & 315), un effet réfrigérant supplémentaire étant apporté par la vaporisation (357, 379), à des températures supérieures à la température la plus élevée régnant dans la zone d'échange thermique la plus froide (312), d'un réfrigérant auxiliaire (373, 377) dérivé du réfrigérant (315) vaporisé dans ladite zone (312). Le réfrigérant auxiliaire peut avoir la même composition que le réfrigérant vaporisé dans la zone d'échange thermique la plus froide, mais il est vaporisé à une pression différente ou peut avoir une composition différente.

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