Patent ID: 9005335
Filing Date: 2015-04-14
Classification: B01D,F02C,F23C,F23J,F23L,Y02A,Y02C,Y02E

Abstract:
1. A process for controlling carbon dioxide exhaust from a combustion process, comprising: (a) performing a combustion process by combusting a mixture of a fuel and air, oxygen-enriched air, or oxygen, thereby creating an exhaust stream comprising carbon dioxide and nitrogen; (b) performing a carbon dioxide capture step to remove a portion of carbon dioxide in concentrated form from a first portion of the exhaust stream, thereby creating an off-gas stream from the capture step that is less concentrated in carbon dioxide than the exhaust stream; (c) providing a membrane having a feed side and a permeate side, and being selectively permeable to carbon dioxide over nitrogen and to carbon dioxide over oxygen; (d) passing a second portion of the exhaust stream and at least a portion of the capture step off-gas stream across the feed side; (e) passing air, oxygen-enriched air, or oxygen as a sweep stream across the permeate side; (f) withdrawing from the feed side a carbon-dioxide depleted vent stream; (g) withdrawing from the permeate side a permeate stream comprising oxygen and carbon dioxide; (h) passing the permeate stream to step (a) as at least part of the air, oxygen-enriched air, or oxygen used in step (a).