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US 11,174,759 B2Granted
Systems and methods for power production using nested CO2 cycles
Assignee8 Rivers Capital, LLC
InventorsRodney John Allam, Brock Alan Forrest
Life of this patent
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Abstract
The present disclosure relates to systems and methods useful for power production. In particular, a power production cycle utilizing CO2 as a working fluid may be combined with a second cycle wherein a compressed CO2 stream from the power production cycle can be heated and expanded to produce additional power and to provide additional heating to the power production cycle.
Claims7
A method of power production comprising:
- carrying out a first cycle that includes:
- expanding a work stream comprising recycled CO2 across a first turbine to produce a first quantity of power;
- withdrawing heat from the work stream in a recuperative heat exchanger;
- compressing the work stream;
- reheating the work stream using withdrawn heat in the recuperative heat exchanger;
- and
- superheating the compressed work stream in a combustor;
- and
- carrying out a nested cycle wherein compressed work stream from the first cycle is heated with a heat source that is independent of the combustor and the recuperative heat exchanger and is expanded across a second turbine to produce a second quantity of power.
6 more elements
A method for improving the efficiency of a power production cycle, the method comprising:
- operating the power production cycle so that compressed, recycled CO2 is passed through a combustor wherein a carbonaceous fuel is combusted with an oxidant to produce an exhaust stream comprising the compressed, recycled CO2;
- the exhaust stream is expanded across a turbine to produce power and form a turbine exhaust stream comprising the recycled CO2;
- the turbine exhaust stream is cooled in a recuperative heat exchanger;
- the cooled turbine exhaust stream is passed through a separator to separate the recycled CO2;
- the recycled CO2 is compressed;
- and the compressed recycled CO2 is split into a first portion and a second portion with the first portion being heated by passage through the recuperative heat exchanger against the turbine exhaust stream;
- and
- adding further heating to the compressed recycled CO2 above the level of heating that is available from the turbine exhaust stream, the further heating being provided by heating the second portion of the compressed recycled CO2 with a heat source that is independent of the power production cycle and expanding across a second turbine to produce a second quantity of power, and transferring heat from the heated, second portion of the compressed recycled CO2 to the first portion of the compressed recycled CO2 in the power production cycle.
5 more elements
Dependencies are inferred from the claim text.