Method and device for the production of variable amounts of...

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

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F25J 3/04 (2006.01)

Patent

CA 2227050

In the method proposed, charge air is fed to a cryogenic rectifying system (15, 16) where it is split up into its constituent gases, and a liquid fraction (31, 32) is taken off and passed into a first storage tank (33). The pressure of any suitable amount of the liquid fraction (34) is increased (35). The liquid fraction (36) is then evaporated under the increased pressure by indirect heat exchange (12) and converted into a pressurized gaseous product (37). A heat-transfer fluid circulates in a refrigeration circuit fitted with a compressor (41, 42). Part (45) of the flow of heat-transfer fluid (44) compressed in the compressor (41, 42) is fed to the indirect heat-exchange unit (12) where the liquid fraction (36) is evaporated and the heat-transfer fluid (44) at least partly liquefied. Another part (59) of the flow of heat- transfer fluid (44) compressed in the compressor (41, 42) is allowed to expand (43), doing useful work. Liquefied heat-transfer fluid (45, 48) is stored in a buffer storage tank (49).

L'invention concerne un procédé selon lequel l'air utilisé est acheminé jusqu'à un système de rectification (14, 15) en vue d'une décomposition à température cryogénique, d'où une fraction liquide (31, 32) est prélevée pour être introduite dans un premier réservoir de stockage (33). La pression d'un volume variable de la fraction liquide (34) est augmentée. La fraction liquide (36) est vaporisée par échange de chaleur (12) indirect sous l'effet de l'élévation de la pression et est obtenue sous forme de produit gazeux comprimé (37). Un caloporteur circule dans un circuit frigorifique qui comporte un compresseur (41, 42). Un premier courant partiel (45) du caloporteur (44) comprimé dans le compresseur (41, 42) est acheminé jusqu'au système d'échange de chaleur indirect (12) en vue de la vaporisation de la fraction liquide (36), et est de ce fait liquéfié, au moins en partie. Un second courant partiel (5) du caloporteur (44) comprimé dans le compresseur (41, 42) est détendu (43), produisant ainsi de l'énergie. Le caloporteur liquide (45, 48) est tamponné dans un second réservoir de stockage (49).

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