| 摘要 |
PCT No. PCT/DE96/00643 Sec. 371 Date Oct. 6, 1997 Sec. 102(e) Date Oct. 6, 1997 PCT Filed Apr. 6, 1996 PCT Pub. No. WO96/32181 PCT Pub. Date Oct. 17, 1996A process for reducing pollutants, particularly nitrogen oxides from combustion gases during a combustion process that takes place while oxygen is supplied, includes providing oxygen needed for the combustion process by separating oxygen from a gas mixture containing oxygen and nitrogen in a two-step process including (a) enriching the gas mixture with oxygen in a first step to provide an enriched gas mixture; and (b) separating oxygen out of the enriched gas mixture in a second step, wherein, during at least one step oxygen depleted gas mixture is removed via an outlet provided with permeability means that cause the outlet to have a higher permeability for nitrogen than oxygen. A device for carrying out this process includes a device for separating oxygen out of a gas mixture containing oxygen and nitrogen including a housing having an inlet for the gas mixture; an outlet for the oxygen separated out of the gas mixture; and first and second apparatuses which have a respectively different permeability for oxygen and nitrogen, and which divide the device into first, second, and third chambers, wherein at least the second chamber is connected to an outlet provided with a permeability device that cause the outlet to have a higher permeability for nitrogen than for oxygen.
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