Patent ID: 7895822

Claim:
A power generation system comprising: at least one turbine system comprising: a compressor section comprising at least one stage, and configured to supply a compressed oxidant; a combustion chamber configured to combust said compressed oxidant and a fuel stream comprising carbon-based fuels and to generate a hot flue gas; an expander section having an inlet for receiving said hot flue gas, said expander section comprising at least two stages, said at least two stages comprising a high pressure expander configured to generate an expanded exhaust gas rich in CO 2 , said high pressure expander fluidly coupled to a low pressure expander configured to generate a final exhaust and electrical energy; and a CO 2 separation system directly coupled to said high pressure expander for receiving the expanded exhaust gas from said high pressure expander and providing a CO 2 lean gas, that is then fed to said low pressure expander.