Process and installation for producing high pressure oxygen

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

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F25J 3/02 (2006.01) F25J 3/04 (2006.01)

Patent

CA 2197156

This process is of the type in which the gaseous oxygen is produced directly at the desired high pressure by pumping liquid oxygen drawn off in the vessel of the low-pressure column (11). The air to be distilled is split into three flows: a flow at the medium pressure of the double distillation column (1), a flow at a high pressure, higher than approximately 60 bars, and a flow at an intermediate pressure which, after partial cooling, is expanded to the medium pressure in a turbine (8). The intermediate pressure is chosen so that the air treated in the turbine is near its dew point at the entry of the turbine wheel. Liquid product is simultaneously drawn off (at 24) from the plant. Application to plants producing large quantities of gaseous oxygen at a pressure higher than 30 bars.

La présente invention vise une méthode permettant de produire directement de l'oxygène gazeux à la pression élevée souhaitée par pompage de l'oxygène liquide soutirée du réservoir de la colonne basse pression (11). L'air à distiller est divisé en trois veines : une veine à la pression moyenne de la double colonne de distillation (1), une veine à haute pression, supérieure à environ 60 bars, et une veine à une pression intermédiaire, laquelle après refroidissement partiel, est détendue dans une turbine (8) jusqu'à atteinte de la pression moyenne. La pression intermédiaire est déterminée pour qu'à son entrée dans la turbine, l'air qui doit y être traité soit près de son point de rosée. Le produit liquide est simultanément soutiré (à 24) de l'installation. L'invention s'applique aux installations de distillation conçues pour produire de grandes quantités d'oxygène gazeux à une pression supérieure à 30 bars.

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