Patent ID: 8713947

Claim:
A power plant arrangement, comprising: at least one main air compressor for compressing ambient air into a compressed ambient gas flow; and at least one gas turbine assembly, comprising: a turbine combustor, fluidly connected to the at least one main air compressor, for mixing at least a first portion of the compressed ambient gas flow with at least a first portion of a recirculated low oxygen content gas flow and a fuel stream to form a combustible mixture and for burning the combustible mixture and forming the recirculated low oxygen content gas flow; a turbine connected to the turbine combustor and to a turbine shaft, and being arranged to be driven by the recirculated low oxygen content gas flow from the turbine combustor; a turbine compressor, fluidly connected to the turbine combustor, and connected to the turbine shaft and being arranged to be driven thereby; a recirculation loop for recirculating at least a portion of the recirculated low oxygen content gas flow from the turbine to the turbine compressor; a recirculated gas flow extraction path for extracting at least a second portion of the recirculated low oxygen content as flow from the at least one as turbine assembly; and a gas separation system for receiving the at least a second portion of the recirculated low oxygen content gas flow from the recirculated gas flow extraction path and separating the at least a second portion of the recirculated low oxygen content gas flow into a nitrogen portion and a carbon dioxide portion; at least one auxiliary turbine fluidly connected to at least a second portion of the compressed ambient gas flow so that the at least a second portion of the compressed ambient gas flow powers the at least one auxiliary turbine; wherein the power plant arrangement is further configured for substantially stoichiometric combustion; and wherein the at least a second portion of the compressed ambient gas flow is not delivered to the turbine combustor subsequent to delivery to the at least one auxiliary turbine.