Patent ID: 7739864

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