Method and apparatus for producing liquid products from air...

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

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F25J 3/04 (2006.01)

Patent

CA 2206649

A cryogenic method and apparatus using a liquefier and a two stage distillation column capable of operating in two modes, namely a first mode of operation during which only liquid nitrogen is produced and a second mode of operation during which liquid nitrogen and liquid oxygen are produced. By adjusting the time of operation in each mode, any ratio of liquid nitrogen to liquid oxygen greater than the ratio achieved during the second mode of operation can be achieved. In the first mode of operation, a condenser is used to condense the lower pressure stage gaseous nitrogen into lower pressure stage nitrogen condensate. To condense the lower pressure stage gaseous nitrogen, either at least a portion of the crude oxygen liquid from the higher pressure stage, at least a portion of the oxygen-enriched liquid from the lower pressure stage, at least a portion of the liquefied air, or mixtures thereof, are introduced to the condenser. In the second mode of operation, the top condenser is not used; instead, all of the crude oxygen liquid is introduced into the lower pressure stage, which produces a bottom liquid oxygen stream and a low pressure overhead waste stream containing nitrogen. The system includes fluid flow lines and valves for directing the flow of certain fluids, particularly the crude oxygen liquid and the oxygen-enriched liquid, during the two modes of operation.

Méthode et appareil cryogénique utilisant un condenseur et une colonne de distillation à deux étages pouvant fonctionner selon deux modes, soit un premier mode où seul de l'azote liquide est produit, et un second mode dans lequel de l'azote liquide et de l'oxygène liquides sont produits. En ajustant la période de fonctionnement de chaque mode, on peut atteindre un rapport azote liquide/oxygène liquide supérieur au rapport atteint dans le second mode de fonctionnement. Dans le premier mode, un condenseur sert à condenser l'azote gazeux de l'étage basse pression en un condensat d'azote d'étage basse pression. Pour condenser l'azote gazeux basse pression, on introduit dans le condenseur soit au moins une partie de l'oxygène liquide brut provenant de l'étage haute pression, soit au moins une partie du liquide enrichi en oxygène provenant de l'étage basse pression, soit au moins une partie de l'air liquéfié, soit leurs mélanges. Dans le second mode, on n'utilise pas le condenseur supérieur; au lieu de cela, tout l'oxygène liquide brut est introduit dans l'étage basse pression, ce qui donne un flux d'oxygène liquide de queue, et, en tête un flux résiduel basse pression renfermant de l'azote. Le système comprend des conduites d'écoulement de fluides et des régulateurs d'écoulement de certains fluides, notamment l'oxygène liquide brut et le liquide enrichi en oxygène, dans les deux modes de fonctionnement.

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