Method and apparatus for liquefying natural gas

Details Method and apparatus for liquefying natural gas Method and apparatus for liquefying natural gas

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 1/02 (2006.01) F25J 1/00 (2006.01) F25J 3/02 (2006.01) F25J 3/06 (2006.01)

Patent

CA 2156249

The process for liquefying natural gas according to the invention consists in liquefying at least part of said gas by expanding it using mechanical energy, the gas during said expansion passing from a dense phase to a liquid phase without phase transition. The process comprises at least the two following steps: a) the natural gas comprised of a plurality of constituants is cooled at a pressure not below the critical pressure value of methane and at a temperature such that said gas is in a dense phase at the end of said cooling; b) at least part of a fraction of said dense phase obtained from step a) is expanded and liquefied through a device (T3) designed to reduce the gas pressure by an expansion process using mechanical energy, the passage from the dense phase condition towards a liquid phase condition occurring substantially without phase transition.

Le procédé de liquéfaction d'un gaz naturel selon l'invention consiste à liquéfier au moins en partie ce gaz en le détendant avec fourniture d'énergie mécanique, le gaz au cours de cette détente passant d'une phase dense à une phase liquide sans transition de phase. Le procédé comporte au moins les deux étapes suivantes: a) on refroidit le gaz naturel constitué de plusieurs constituants à une pression au moins supérieure ou égale à la valeur de pression critique du méthane et à une température telle que ledit gaz se présente en phase dense à la fin de ce refroidissement, b) on détend et on liquéfie au moins en partie une fraction de ladite phase dense provenant de l'étape a) à travers un dispositif (T3) adapté à diminuer la pression du gaz selon une détente avec fourniture d'énergie mécanique, le passage de l'état en phase dense vers un état en phase liquide se faisant sensiblement sans transition de phase.

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