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US 11,891,950 B2Granted
Systems and methods for power production with integrated production of hydrogen
Assignee8 Rivers Capital, LLC
InventorsRodney John Allam, Navid Rafati
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 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.
Claims21
A method for hydrogen production from a carbonaceous fuel with capture of carbon dioxide derived from the carbonaceous fuel, the method comprising:
- reacting a first portion of the carbonaceous fuel from a carbonaceous fuel stream in a first reactor with oxygen under conditions effective to produce a first reaction stream comprising hydrogen and carbon monoxide;
- reacting a second portion of the carbonaceous fuel from the carbonaceous fuel stream in a second reactor with steam under conditions effective to produce a second reaction stream comprising hydrogen and carbon monoxide, wherein the reacting in the second reactor is endothermic, and wherein exhaust heat from the first reactor is transferred to the second reactor to provide at least a portion of the heating needed to carry out the reacting in the second reactor;
- combining the first reaction stream comprising hydrogen and carbon monoxide with the second reaction stream comprising hydrogen and carbon monoxide to provide a total reaction stream comprising hydrogen and carbon monoxide;
- processing the total reaction stream comprising hydrogen and carbon monoxide through a unit or units effective to provide a stream of substantially pure hydrogen and a waste stream comprising at least carbon dioxide;
- providing the waste stream comprising the at least carbon dioxide to a combustor in a power production cycle configured for capture of the carbon dioxide in combination with power production, the combustor being configured for combusting a third portion of the carbonaceous fuel from the carbonaceous fuel stream with oxygen under conditions effective to produce a combustor exhaust stream comprising at least carbon dioxide;
- and
- processing the combustor exhaust stream comprising the at least carbon dioxide so that the carbon dioxide from the combustor exhaust stream is provided as a compressed, substantially pure stream.
4 more elements
A method for hydrogen production from a carbonaceous fuel with capture of carbon dioxide derived from the carbonaceous fuel, the method comprising:
- reacting a first portion of the carbonaceous fuel from a carbonaceous fuel stream in a first reactor with oxygen under conditions effective to produce a first reaction stream comprising hydrogen and carbon monoxide;
- reacting a second portion of the carbonaceous fuel from the carbonaceous fuel stream in a second reactor with steam under conditions effective to produce a second reaction stream comprising hydrogen and carbon monoxide;
- combining the first reaction stream comprising hydrogen and carbon monoxide with the second reaction stream comprising hydrogen and carbon monoxide to provide a total reaction stream comprising hydrogen and carbon monoxide;
- processing the total reaction stream comprising hydrogen and carbon monoxide through one or more catalytic shift reactors where carbon monoxide present in the total reaction stream comprising hydrogen and carbon monoxide reacts with steam present in the total reaction stream comprising hydrogen and carbon monoxide to produce carbon dioxide and hydrogen and thus produce a shift stream comprising at least carbon dioxide and hydrogen;
- passing the shift stream comprising at least carbon dioxide and hydrogen through one or more shift stream heat recovery heat exchangers so that heat from the shift stream comprising at least carbon dioxide and hydrogen is used to heat one or more of the fuel from the carbonaceous fuel stream that is input to the first reactor, the fuel from the carbonaceous fuel stream that is input to the second reactor, and feed-water that forms the steam that is input to the second reactor;
- processing the shift stream comprising at least carbon dioxide and hydrogen through a unit or units effective to provide a stream of substantially pure hydrogen and a waste stream comprising at least carbon dioxide;
- providing the waste stream comprising the at least carbon dioxide to a combustor in a power production cycle configured for capture of the carbon dioxide in combination with power production, the combustor being configured for combusting a third portion of the carbonaceous fuel from the carbonaceous fuel stream with oxygen under conditions effective to produce a combustor exhaust stream comprising at least carbon dioxide;
- and
- processing the combustor exhaust stream comprising the at least carbon dioxide so that the carbon dioxide from the combustor exhaust stream is provided as a compressed, substantially pure stream.
6 more elements
Dependencies are inferred from the claim text.