Gas stream purification method

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

Patent

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F25J 3/00 (2006.01)

Patent

CA 2606332

A method of purifying a gas stream (12) by removing oxygen from the gas stream in which the gas stream (12) is introduced into a series of electrically driven oxygen separation zones (16, 18, 20) that separate the oxygen from the gas stream (12) . Each of the electrically driven oxygen separation zones (16, 18, 20) has an electrolyte (34) that conducts oxygen ions upon the application of the voltage (38, 39, 40) to electrodes (22, 24; 26, 28; 30, 32) sandwiching the electrolyte (34) . The voltage (38, 39, 40) applied to each of the electrodes (22, 24; 26, 28; 30, 32) of the separation zones (16, 18, 20) is selected such that an ionic current induced in the electrolyte (34) within a particular zone (16, 18, 20) that is no greater than a limiting current. When voltage (38, 39, 40) is applied in such manner, the electrical power that is consumed is reduced over the power that would otherwise be consumed had a constant voltage been applied to all zones (16, 18, 20) . The gas stream (12) can be a crude argon stream (60) obtained from a crude argon column or a crude nitrogen stream (90) obtained from a pressure swing adsorption unit or a polymeric membrane unit .

L'invention concerne un procédé permettant d'épurer un flux gazeux (12) en prélevant du flux gazeux de l'oxygène dans lequel ledit flux gazeux (12) est introduit en séries de zones de séparation d'oxygène entraîné électriquement (16, 18, 20) qui séparent l'oxygène du flux gazeux (12). Chacune de ces zones (16, 18, 20) a un électrolyte (34) qui conduit l'oxygène lors de l'application de la tension (38, 39, 40) à des électrodes (22,24; 26, 28; 30, 32) prenant en sandwich l'électrolyte (34). La tension (38, 39, 40) appliquée à chacune des électrodes (22,24; 26, 28; 30, 32) des zones séparées (16, 18, 20) est choisie de façon qu'un courant ionique induit dans l'électrolyte (34) dans une zone particulière (16, 18, 20) n'excède pas un courant de limitation. Lorsque la tension (38, 39, 40) est ainsi appliquée, la puissance électrique consommée est réduite par rapport à la puissance qui aurait été consommée si l'on avait appliqué une tension constante à toutes les zones (16, 18, 20). Le flux gazeux (12) peut être un flux d'argon brut (60) obtenu à partir d'une colonne d'argon brut ou un flux d'azote brut (90) obtenu à partir d'une unité d'adsorption à oscillation en pression ou d'une unité membranaire polymère.

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