Systems and methods for power production with integrated production of hydrogen
Assignee8 Rivers Capital, LLC
InventorsRodney John Allam, Navid Rafati
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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 configured for simultaneous hydrogen production. Beneficially, substantially all carbon arising from combustion in power production and hydrogen production is captured in the form of carbon dioxide. Further, produced hydrogen (optionally mixed with nitrogen received from an air separation unit) can be input as fuel in a gas turbine combined cycle unit for additional power production therein without any atmospheric CO2 discharge.
Claims16
A method for combined power production and hydrogen production, the method comprising:
- carrying out the power production in a power production unit comprising:
- combusting a first hydrocarbon fuel in a first combustor with an oxidant in the presence of a recycled CO2 stream at a combustion pressure to provide a combustion product stream including CO2;
- expanding the combustion product stream including CO2 across a turbine to produce power and form a turbine discharge stream including CQ2;
- cooling the turbine discharge stream including CO2, in a recuperative heat exchanger;
- separating the CO2 from any further components of the turbine discharge stream to provide a stream comprising the recycled CO2;
- compressing the stream comprising the recycled CO2 to substantially the combustion pressure to provide a compressed recycled CO2 stream;
- heating the compressed recycled CO2 stream in the recuperative heat exchanger, with heat withdrawn from the turbine exhaust stream to provide a heated stream comprising the recycled CO2;
- and
- passing the heated stream comprising the recycled CO2 to the first combustor;
- and carrying out the hydrogen production in a hydrogen production unit comprising:
- passing a stream of a second hydrocarbon fuel through a partial oxidation reactor to form a synthesis gas stream;
- processing the synthesis gas stream to provide a stream of substantially pure hydrogen and a waste stream comprising at least carbon monoxide;
- and
- passing at least the carbon monoxide from the waste stream to the first combustor.
A method for combined power production and hydrogen production, the method comprising:
- carrying out the power production in a power production unit comprising:
- combusting a first hydrocarbon fuel in a first combustor with an oxidant in the presence of a recycled CO2 stream at a combustion pressure to provide a combustion product stream including CO2;
- expanding the combustion product stream including CO2 across a turbine to produce power and form a turbine discharge stream including CQ2;
- cooling the turbine discharge stream including CO2 in a recuperative heat exchanger;
- separating the CO2 from any further components of the turbine discharge stream to provide a stream comprising the recycled CO2;
- compressing the stream comprising the recycled CO2 to substantially the combustion pressure to provide a compressed recycled CO2 stream;
- heating the compressed recycled CO2 stream in the recuperative heat exchanger, with heat withdrawn from the turbine exhaust stream to provide a heated stream comprising the recycled CO2;
- and
- passing the heated stream comprising the recycled CO2 to the first combustor;
- and carrying out the hydrogen production in a hydrogen production unit comprising:
- passing a stream of a second hydrocarbon fuel through a partial oxidation reactor to form a synthesis gas stream;
- and
- processing the synthesis gas stream to provide a stream of substantially pure hydrogen and a waste stream comprising at least carbon monoxide;
- wherein the waste stream is compressed to a pressure suitable for input to the combustor.
Dependencies are inferred from the claim text.