Dual stage nitrogen rejection from liquefied natural gas

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

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

Patent

CA 2605545

Nitrogen is removed from a liquefied natural gas feed (41 ) by a two stage separation in which the liquefied natural gas (41 ) is first fractionated (23) to provide a first nitrogen-enriched overhead vapour stream (46) and a nitrogen- containing bottoms liquid stream (19) and then at least a portion of said bottoms liquid stream (19) is fractionated (25) to provide a second nitrogen-enriched overhead vapour stream (36) that is of lower purity than said first overhead vapour stream (46) and a purified liquefied natural gas stream (50). The first fractionation is conducted in a distillation column (23) refluxed (45) with nitrogen overhead (43) condensed in a condenser (24) located in a flash drum (25) in which the second fractionation is conducted. The provision of two nitrogen-containing streams (26, 36) of different concentration permits control of the nitrogen content of fuel gas for use in the natural gas liquefaction plant.

Selon l~invention, de l'azote est éliminé d'une alimentation en gaz naturel liquéfié (41) par une séparation en deux étages dans laquelle le gaz naturel liquéfié (41) est tout d'abord fractionné (23) pour fournir un premier flux de vapeur de tête enrichi en azote (46) et un flux liquide résiduel contenant de l~azote (19) et ensuite, au moins une partie desdits flux liquides résiduels (19) est fractionnée (25) pour fournir un second flux de vapeur de tête enrichi en azote (36) qui est d~une pureté inférieure à celle du premier flux de vapeur de tête (46) et un flux de gaz naturel liquéfié purifié (50). Le premier fractionnement est effectué dans une colonne de distillation (23) chauffée au reflux (45), le flux d~azote (43) étant condensé dans un système réfrigérant (24) situé dans un ballon de détente (25) où le second fractionnement est effectué. La fourniture de deux flux contenant de l'azote (26, 36) de concentrations différentes permet de réguler la teneur en azote du gaz de carburant destiné à une utilisation dans une installation de liquéfaction de gaz naturel.

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