Cryogenic air separation

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

Patent

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F25J 3/04 (2006.01) F25J 3/00 (2006.01)

Patent

CA 2612311

A cryogenic air separation system wherein nitrogen vapor (10) from a higher pressure column (30) and oxygen liquid from a lower pressure column (31) each pass down through a once-through main condenser (32) in heat exchange relation and some but not all of the oxygen liquid is vaporized such that the oxygen liquid (33) and vapor (34) exit the condenser (32) in a liquid to vapor mass flowrate ratio within the range of from 0.05 to 0.5 whereby the need for a recirculation pump to ensure avoidance of oxygen boiling to dryness is eliminated.

L'invention concerne un système de séparation d'air cryogénique dans lequel la vapeur d'azote (10) produite par une colonne de pression élevée (30) et l'oxygène liquide produit par une colonne de pression basse (31) passent dans un condenseur principal à passage unique (32) par relation d'échange thermique, et dans lequel une partie seulement de l'oxygène liquide est vaporisée de sorte que l'oxygène liquide (33) et la vapeur (34) s'échappent du condenseur (32) selon un rapport de débit massique de liquide sur vapeur allant d'une plage de 0.05 à 0.5, ce qui rend inutile l'utilisation d'une pompe de recirculation pour éviter l'ébullition de l'oxygène jusqu'à siccité.

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