Hydrogen production process with carbon dioxide capture having reduced carbon intensity
AssigneeUop LLC
InventorsMichael R. Van de Cotte, Lin Jin, Bradley Russell
Life of this patent
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Abstract
Methods which utilize low-grade heat produced in the hydrogen production process to reduce the energy required by the compressor to compress the PSA tail gas stream. The low-grade heat is used to produce a low-pressure steam stream. The low pressure steam stream is introduced to a steam turbine to generate power. The power produced by the turbine reduces the amount of power required to operate the tail gas compressor, thus reducing the overall power requirement for the process.
Claims19
A method of producing a hydrogen-enriched product and recovering CO2 comprising:
- providing a synthesis gas stream comprising hydrogen and carbon dioxide from a hydrogen production process, the hydrogen production process producing low-grade heat;
- producing a low-pressure steam stream from the low-grade heat;
- separating the synthesis gas stream in a hydrogen pressure swing adsorption (PSA) unit into a first high-pressure hydrogen stream enriched in hydrogen and a hydrogen depleted tail gas stream comprising a portion of the hydrogen and the carbon dioxide;
- compressing the hydrogen depleted tail gas stream in a tail gas compressor to form a compressed tail gas stream, or compressing a refrigerant gas stream in a refrigerant gas compressor in a cryogenic fractionation CO2 process, or both;
- introducing the low-pressure steam stream to a turbine to generate power for the tail gas compressor or the refrigerant gas compressor;
- separating the compressed tail gas stream in a CO2 recovery system into a CO2-enriched product stream and an overhead stream comprising the portion of the hydrogen;
- and
- recovering the CO2-enriched product stream.
A method of producing a hydrogen-enriched product and recovering CO2 comprising:
- providing a synthesis gas stream comprising hydrogen and carbon dioxide from a hydrogen production process, the hydrogen production process producing low-grade heat;
- producing a low-pressure steam stream from the low-grade heat;
- separating the synthesis gas stream in a hydrogen pressure swing adsorption (PSA) unit into a first high-pressure hydrogen stream enriched in hydrogen and a hydrogen depleted tail gas stream comprising a portion of the hydrogen and the carbon dioxide;
- compressing the hydrogen depleted tail gas stream in a tail gas compressor to form a compressed tail gas stream, the tail gas compressor requiring a total amount of power to operate, or compressing a refrigerant gas stream in a refrigerant gas compressor in a cryogenic fractionation CO2 process, the refrigerant gas compressor requiring a total amount of power to operate, or both;
- superheating the low-pressure steam stream;
- introducing the superheated low-pressure steam stream to a turbine to generate power, the total amount of power to operate the tail gas compressor, or the refrigerant gas compressor, or both being reduced by 20% or more using the power produced by the turbine;
- separating the compressed tail gas stream in a CO2 recovery system into a CO2-enriched product stream and an overhead stream comprising the portion of the hydrogen;
- and
- recovering the CO2-enriched product stream.
Dependencies are inferred from the claim text.