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US 9,850,815 B2Granted
Method and system for power production with improved efficiency
Assignee8 Rivers Capital, LLC
InventorsRodney John Allam, Brock Alan Forrest, Jeremy Eron Fetvedt
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to systems and methods that provide power generation using predominantly CO2 as a working fluid. In particular, the present disclosure provides for the use of a portion of the heat of compression from a CO2 compressor as the additive heating necessary to increase the overall efficiency of a power production system and method.
Claims30
A method for heating a recirculating gas stream comprising:
- passing a gas stream G at a pressure P1 and a temperature T1 through a recuperative heat exchanger such that the gas stream G is cooled to a temperature T2 that is less than T1;
- separating the gas stream G into a first fraction G1 and a second fraction G2;
- compressing the gas stream fraction G1 to a pressure P2 that is greater than P1 to form a compressed gas stream fraction G1;
- compressing the gas stream fraction G2 to a pressure P3 that is greater than P1 so as to heat the gas stream fraction G2 to a temperature T3 that is greater than T2 and form a compressed gas stream fraction G2;
- withdrawing an amount of heat from the compressed gas stream fraction G2;
- combining the compressed gas stream fraction G1 and the compressed gas stream fraction G2 to form a combined recirculating gas stream GC;
- pumping the combined recirculating gas stream GC to a pressure P4 that is greater than P2 and greater than P3;
- and
- passing the combined recirculating gas stream GC to the recuperative heat exchanger such that the combined recirculating gas stream GC is heated by the gas stream G;
- wherein at least a portion of the amount of heat withdrawn from the compressed gas stream fraction G2 is added to the combined recirculating gas stream GC after pumping to pressure P4.
7 more elements
A method of generating power, the method comprising:
- combusting a fuel with oxygen in a combustor in the presence of a recycle CO2 stream to produce a CO2 containing combustion stream;
- passing the CO2 containing combustion stream through a turbine to expand the CO2 containing combustion stream, generate power, and form a turbine exhaust stream;
- withdrawing heat from the turbine exhaust stream;
- dividing the turbine exhaust stream to form a first turbine exhaust portion and second turbine exhaust portion;
- separating water from the first turbine exhaust portion to form a main recycle CO2 stream;
- compressing the main recycle CO2 stream;
- compressing the second turbine exhaust portion to form a heated, compressed second turbine exhaust portion;
- withdrawing heat from the heated, compressed second turbine exhaust portion to form a cooled, compressed second turbine exhaust portion;
- separating water from the cooled, compressed second turbine exhaust portion to form a secondary recycle CO2 stream;
- combining the main recycle CO2 stream and the secondary recycle CO2 stream to form a combined recycle CO2 stream;
- compressing the combined recycle CO2 stream;
- heating the combined recycle CO2 stream with heat withdrawn from the turbine exhaust stream;
- and
- further heating the combined recycle CO2 stream with heat withdrawn from the heated, compressed second turbine exhaust portion.
11 more elements
A power generating system comprising:
- a combustor configured to exhaust a combustion stream;
- a power production turbine configured to receive and expand the combustion stream and form a turbine exhaust stream;
- a recuperative heat exchanger configured to receive the turbine exhaust stream to form a cooled turbine exhaust stream;
- a flow separator configured to separate the cooled turbine exhaust stream into a first gas stream and a second gas stream;
- a first compressor configured to receive and compress the first gas stream;
- a second compressor configured to receive and compress the second gas stream;
- a pump configured to pressurize the first gas stream and the second gas stream in combination, the pump positioned downstream from the first compressor and the second compressor;
- a first flow path through the recuperative heat exchanger configured for passage of the turbine exhaust stream;
- a second flow path through the recuperative heat exchanger configured for passage of the pressurized first gas stream and second gas stream in combination;
- a third flow path through the recuperative heat exchanger configured for passage of the compressed second gas stream;
- wherein the first flow path and the third flow path are configured for heating the second flow path.
8 more elements
Dependencies are inferred from the claim text.