Patent ID: 9457313
Filing Date: 2016-10-04
CPC Classification: B01D,F01K,F02C,F05D,F23C,F23L,Y02C,Y02E

Claim Text:
1. A process for controlling carbon dioxide exhaust from combustion of a gaseous fuel, comprising: (a) performing a combustion step by combusting a mixture comprising a gaseous fuel and an oxygen-containing gas in a combustor, thereby generating a combustor exhaust stream comprising carbon dioxide and nitrogen; (b) routing the combustor exhaust stream as at least a portion of a working gas stream to a gas turbine, thereby generating electrical power and creating a turbine exhaust stream; (c) providing a first membrane having a first feed side and a first permeate side, and being selectively permeable to carbon dioxide over nitrogen and to carbon dioxide over oxygen; (d) passing at least a portion of the turbine exhaust stream across the first feed side; (e) withdrawing from the first permeate side a partially concentrated carbon dioxide first permeate stream; (f) withdrawing from the first feed side a carbon dioxide-depleted first residue stream; (g) providing a second membrane having a second feed side and a second permeate side, and being selectively permeable to carbon dioxide over nitrogen and to carbon dioxide over oxygen; (h) passing the first residue stream across the second feed side; (i) passing air, oxygen-enriched air, or oxygen as a sweep stream across the second permeate side; (j) withdrawing from the second feed side a second residue stream that is depleted in carbon dioxide compared to the first residue stream; (k) withdrawing from the second permeate side a second permeate stream comprising oxygen and carbon dioxide; and (l) passing at least a portion of the second permeate stream to a location between the combustor and the gas turbine as part of the working gas stream.