Method and plant for liquefying natural gas

Details Method and plant for liquefying natural gas Method and plant for liquefying natural gas

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 1/02 (2006.01) F25J 3/02 (2006.01) F25J 3/06 (2006.01)

Patent

CA 2177599

A method for liquefying pressurised natural gas including at least one refrigeration cycle using a coolant mixture, and comprising at least the following steps: (a) said coolant mixture is at least partially condensed by compression (K1) and cooling (C1), e.g. by means of an external cooling fluid, to give at least one vapour fraction (5) and a liquid fraction (6); (b) each of the vapour and liquid fractions is at least partially decompressed (T1, V1) separately to form a light fluid (M1) mainly consisting of a vapour phase, and a heavy fluid (M2) mainly consisting of a liquid phase; (c) the fluids (M1, M2) are at least partially mixed together to form a low-temperature mixture (10); and (d) the pressurised natural gas (1) is liquefied and sub-cooled by means of a heat exchange with the low-temperature mixture from step (c).

On liquéfie un gaz naturel sous pression comprenant au moins un cycle de réfrigération à l'aide d'un mélange de fluides réfrigérants en procédant au moins aux étapes suivantes: a) on condense au moins en partie ledit mélange réfrigérant en le comprimant (K1) et en le refroidissant (C1), par exemple, à l'aide d'un fluide externe de refroidissement, pour obtenir au moins une fraction vapeur (5) et une fraction liquide (6), b) on détend séparement (T1, V1) au moins en partie chacune des fractions vapeur et liquide pour obtenir un fluide léger M1 composé on majorité d'une phase vapeur et un fluide lourd M2 composé en majorité d'une phase liquide, c) on mélange au moins en partie les fluides M1 et M2 pour obtenir un mélange (10) à basse température, et d) on liquéfie et on sous-refroidit le gaz naturel sous pression (1) par échange thermique avec le mélange à basse température obtenu au cours de l'étape c).

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