Method of rejecting nitrogen from a hydrocarbon stream to...

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

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

Patent

CA 2741970

Method of, and apparatus (1) for, rejecting nitrogen from a hydrocarbon stream (10) to provide a fuel gas stream (510). A hydrocarbon stream (10) is at least partially liquefied and subsequently expanded. The expanded hydrocarbon stream (110) is fractionated in a fractionation column (150) to provide an nitrogen- rich hydrocarbon stream (160) and a nitrogen-lean hydrocarbon stream (170). The nitrogen-rich hydrocarbon stream (160) is partially condensed in a condenser (200) by cooling against a refrigerant circulated in a dedicated first refrigerant circuit (800), and phase-separated to provide a nitrogen-rejection stream (260) and a nitrogen-lean reflux stream (270) which is returned to the fractionation column (150). The nitrogen-lean hydrocarbon stream (170) is partially vaporized and phase-separated to provide a vapour stream (360) that is returned to the fractionation column (150) and a liquefied nitrogen-lean hydrocarbon stream (370) that is subjected to sub- cooling. The fuel gas stream (510) is generated from the sub-cooled nitrogen-lean hydrocarbon stream (410).

L'invention concerne un procédé et un appareil (1) permettant de rejeter l'azote d'un flux d'hydrocarbure (10) pour produire un flux de gaz combustible (510). Un flux d'hydrocarbure (10) est au moins partiellement liquéfié et, par la suite, détendu. Le flux d'hydrocarbure détendu (110) est fractionné dans une colonne de fractionnement (150) pour produire un flux d'hydrocarbure riche en azote (160) et un flux d'hydrocarbure pauvre en azote (170). Le flux d'hydrocarbure riche en azote (160) est partiellement condensé dans un condenseur (200) par refroidissement contre un réfrigérant que l'on fait circuler dans un premier circuit réfrigérant spécialisé (800), et qui est séparé en phase pour produire un flux de rejet d'azote (260) et un flux de reflux pauvre en azote (270) que l'on retourne vers la colonne de fractionnement (150). Le flux d'hydrocarbure pauvre en azote (170) est partiellement vaporisé et séparé en phase pour produire un flux de vapeur que l'on retourne à la colonne de fractionnement (150) et un flux d'hydrocarbure pauvre en azote (370) que l'on soumet à un sous-refroidissement. Le flux de gaz combustible (510) est généré à partir du flux d'hydrocarbure pauvre en azote (410).

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