System and method for high efficiency power generation using a carbon dioxide circulating working fluid
AssigneesPalmer Labs, LLC, 8 Rivers Capital, LLC
InventorsRodney John Allam, Miles R. Palmer, Glenn William Brown, Jr.
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Abstract
The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO2 circulating fluid. Fuel derived CO2 can be captured and delivered at pipeline pressure. Other impurities can be captured.
Claims15
A method of power generation comprising:
- expanding a CO2-containing stream from a pressure of at least about 12 MPa and from a temperature of at least about 750° C. across a series of a first turbine and a last turbine so as to output from the last turbine a last turbine discharge stream comprising CO2;
- passing the last turbine discharge stream though a recuperator heat exchanger to withdraw heat therefrom as a heating source and form a cooled turbine discharge stream;
- isolating at least a portion of the CO2 from the cooled turbine discharge stream to form a recycle CO2 stream;
- compressing the recycle CO2 stream to a pressure of at least about 12 MPa to form a compressed recycle CO2 stream;
- heating a first portion of the compressed recycle CO2 stream with the heat withdrawn from the last turbine discharge stream in the recuperator heat exchanger, heating a second portion of the compressed recycle CO2 stream with heat from a source other than the heat withdrawn from the last turbine discharge stream, and combining the first portion and the second portion to form a combined heated, compressed recycle CO2 stream;
- passing the combined heated, compressed recycle CO2 stream to a combustor wherein a hydrocarbon or carbonaceous fuel is combusted in the presence of an oxidant and the combined heated, compressed recycle CO2 stream to further heat the combined heated, compressed recycle CO2 stream so as to form the CO2-containing stream;
- and
- passing the CO2-containing stream to the first turbine in the series.
Dependencies are inferred from the claim text.