Patent ID: 9689309
Date: 2017-06-27
CPC Classifications: B01D,F02C,F05D,Y02C,Y02E,Y02P,Y02T

Claim:
1. A method for generating power comprising: compressing one or more oxidants in a first compressor to generate a compressed oxidant; supplying a first portion of the compressed oxidant, at least one first fuel, and a first diluent to a first combustion chamber; substantially stoichiometrically combusting the first portion of the compressed oxidant and the at least one first fuel in the first combustion chamber to generate a first exhaust stream; expanding the first exhaust stream in a first expander to generate a first gaseous exhaust stream; using one or more sensors to measure one or more components of the first gaseous exhaust stream; controlling a flow of the first portion of the compressed oxidant into the first combustion chamber by adjusting a metering valve based on one or more measurements from the one or more sensors in order to maintain substantially stoichiometric combustion conditions in the first combustion chamber, wherein substantially stoichiometric combustion is a combustion reaction having an equivalence ratio in a range of 0.9:1 to 1.1:1; compressing a cooled recycle stream in a second compressor to generate a compressed recycle stream; supplying a second portion of the compressed oxidant, at least one second fuel, and a second diluent to a second combustion chamber; combusting the second portion of the compressed oxidant and the at least one second fuel in the second combustion chamber to generate a second exhaust stream; expanding the second exhaust stream in a second expander to generate a second gaseous exhaust stream; recovering heat from the first and second gaseous exhaust streams; combining the first and second gaseous exhaust streams to form a combined exhaust stream; cooling the combined exhaust stream to generate the cooled recycle stream; splitting the compressed recycle stream into a first portion and a second portion of the compressed recycle stream; and separating the first portion of the compressed recycle stream to generate an effluent stream primarily comprising carbon dioxide and a product stream primarily comprising at least one of nitrogen, oxygen, and argon; wherein the first diluent comprises a first portion of the product stream and the second diluent comprises at least a portion of the second portion of the compressed recycle stream.