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US 10,018,115 B2Granted
System and method for high efficiency power generation using a carbon dioxide circulating working fluid
Assignee8 Rivers Capital, LLC
InventorsRodney John Allam, Miles R. Palmer, Glenn William Brown, Jr., Jeremy Eron Fetvedt, Brock Alan Forrest
Life of this patent
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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.
Claims22
A method of power generation comprising:
- combusting a hydrocarbon or carbonaceous fuel in a first combustor in presence of an oxidant and a recycle CO2 stream so as to form a first combustor exhaust stream at a pressure of at least about 12 MPa and a temperature of at least about 800° C.;
- expanding the first combustor exhaust stream across a first turbine to form a first turbine discharge stream;
- heating the first turbine discharge stream in a second combustor to form a second combustor exhaust stream;
- expanding the second combustor exhaust stream across a second turbine so as to output from the second turbine a second turbine discharge stream such that a pressure ratio of the first combustor exhaust stream relative to the second turbine discharge stream is at least 20;
- cooling the second turbine discharge stream in a recuperator heat exchanger to form a cooled turbine discharge stream;
- isolating at least a portion of CO2 from the cooled turbine discharge stream to form the recycle CO2 stream;
- compressing the recycle CO2 stream;
- and
- passing the recycle CO2 stream to the first combustor.
6 more elements
A power generation system comprising:
- a first combustor adapted to combust a fuel in the presence of a recycle CO2 stream and provide a first combustor exhaust stream at a pressure of at least about 10 MPa;
- a first turbine in fluid communication with the first combustor and comprising an inlet adapted to receive the first combustor exhaust stream and an outlet adapted to output a first turbine discharge stream;
- a second combustor in fluid communication with the first turbine and comprising an inlet adapted to receive the first turbine discharge stream and an outlet adapted to output a second combustor exhaust stream;
- a second turbine in fluid communication with the second combustor and comprising an inlet adapted to receive the second combustor exhaust stream and an outlet adapted to output a second turbine discharge stream at a pressure that is less than about 0.15 MPa;
- a recuperator heat exchanger in fluid communication with the second turbine, the recuperator heat exchanger being adapted to receive the second turbine discharge stream and transfer heat therefrom to the recycle CO2 stream;
- and
- at least one compressor in fluid communication with the recuperator heat exchanger and adapted to pressurize the recycle CO2 stream to a pressure of at least about 10 MPa.
4 more elements
A power generation system comprising:
- a first turbine and a second turbine in series that are adapted to expand a high pressure recycle CO2 stream between a high pressure of about 10 MPa to about 60 MPa over a pressure ratio that is greater than 20 and discharge from the second turbine at a pressure that is less than about 0.15 MPa;
- a combustor in a working arrangement between the first turbine and the second turbine and adapted to heat a discharge stream from the first turbine;
- a recuperator heat exchanger in a working arrangement with the second turbine and adapted to transfer heat between a discharge stream from the second turbine and the high pressure recycle CO2 stream;
- and
- at least one compressor in a working arrangement with the recuperator heat exchanger and adapted to pressurize the high pressure recycle CO2 stream to a pressure of at least about 10 MPa.
2 more elements
A power generation system comprising:
- a first combustor adapted to combust a fuel in the presence of a recycle CO2 stream and provide a first combustor exhaust stream at a pressure of at least about 12 MPa;
- a first turbine in a working arrangement with the first combustor and comprising an inlet adapted to receive the first combustor exhaust stream and an outlet adapted to output a first turbine discharge stream;
- a second combustor in a working arrangement with the first turbine and comprising an inlet adapted to receive the first turbine discharge stream and an outlet adapted to output a second combustor exhaust stream;
- a second turbine in a working arrangement with the second combustor and comprising an inlet adapted to receive the second combustor exhaust stream and an outlet adapted to output a second turbine discharge stream, the first turbine and the second turbine being adapted to expand their respective streams such that the pressure ratio at the inlet of the first turbine to the outlet of the second turbine is at least about 20;
- a recuperator heat exchanger in a working arrangement with the second turbine, the recuperator heat exchanger being adapted to receive the second turbine discharge stream and transfer heat therefrom to the recycle CO2 stream;
- and
- at least one compressor in a working arrangement with the recuperator heat exchanger and adapted to pressurize the recycle CO2 stream to a pressure of at least about 12 MPa.
4 more elements
A power generation system comprising:
- a first turbine and a second turbine in series that are adapted to expand a high pressure recycle CO2 stream between a high pressure of about 10 MPa to about 60 MPa over a pressure ratio that is greater than 20;
- a combustor in a working arrangement with an outlet of the first turbine and an inlet of the second turbine and adapted to heat the high pressure recycle CO2 stream;
- a recuperator heat exchanger in a working arrangement with an outlet of the second turbine and adapted to transfer heat between a discharge stream from the outlet of the second turbine and the high pressure recycle CO2 stream;
- and
- at least one compressor in a working arrangement with the recuperator heat exchanger and adapted to pressurize the recycle CO2 stream to a pressure of at least about 10 MPa.
2 more elements
Dependencies are inferred from the claim text.