ASU nitrogen sweep gas in hydrogen separation membrane for production of HRSG duct burner fuel
AssigneePraxair Technology, Inc.
InventorsGregory J. Panuccio, Troy M. Raybold, Agil Jamal, Raymond Francis Drnevich
Life of this patent
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Abstract
The present invention relates to the use of low pressure N2 from an air separation unit (ASU) for use as a sweep gas in a hydrogen transport membrane (HTM) to increase syngas H2 recovery and make a near-atmospheric pressure (less than or equal to about 25 psia) fuel for supplemental firing in the heat recovery steam generator (HRSG) duct burner.
Claims25
A process for H2 recovery from a H2-containing gas stream from a gasifier, the process comprising:
- feeding the H2-containing gas stream to a first hydrogen transport membrane (HTM);
- feeding a first portion of nitrogen produced in an air separation unit (ASU) to the first HTM as a HTM permeate sweep stream;
- recovering a first H2-N2 fuel mixture from the first HTM and supplied to a gas turbine generator;
- feeding a retentate stream from the first HTM to a second hydrogen transport membrane (HTM);
- feeding a second portion of nitrogen produced in the ASU to the second HTM for use as a HTM permeate sweep stream;
- and
- recovering a second H2-N2 fuel mixture from the second HTM and supply as a fuel to a duct burner of a heat recovery steam generator.
An apparatus for increasing H2 recovery from a H2-containing gas stream from a gasifier, the apparatus comprising:
- an air separation unit (ASU) configured to provide a source of nitrogen;
- a first hydrogen transport membrane (HTM) configured to receive a portion of the ASU nitrogen as a first HTM permeate sweep stream and the H2-containing stream to produce an H2 fuel mixture and provide it as a fuel to a gas turbine engine;
- and
- a second hydrogen transport membrane (HTM) configured to receive a second portion of the ASU nitrogen as a second HTM permeate sweep stream and configured to receive retentate from the first HTM to produce a second H2 fuel mixture to supply a burner of a heat recovery steam generator.
A process for H2 recovery from a H2-containing gas stream from a gasifier in power and H2 co-production plants, the process comprising:
- feeding a gas stream to a first hydrogen transport membrane (HTM);
- recovering H2 permeate from the first HTM;
- feeding retentate from the first HTM to a second hydrogen transport membrane;
- feeding a first portion of nitrogen produced in an air separation unit (ASU) to the second HTM as a HTM permeate sweep stream;
- recovering a first H2-N2 fuel mixture from the second HTM and supplied to a gas turbine engine;
- feeding retentate from the second HTM to a third HTM;
- feeding a second portion of nitrogen produced in the ASU to the third HTM for use as a HTM permeate sweep stream;
- and
- recovering a second H2-N2 fuel mixture from the third HTM for use a duct burner fuel.
A process for H2 recovery from a H2-containing gas stream from a gasifier in power and H2 co-production plants, the process comprising:
- feeding a first portion of the H2-containing gas stream to a first hydrogen transport membrane (HTM);
- feeding a second portion of the H2-containing gas stream to a second hydrogen transport membrane;
- feeding a first portion of nitrogen produced in an air separation unit (ASU) to the second HTM as a HTM permeate sweep stream;
- recovering H2 permeate from the first HTM;
- recovering a first H2-N2 fuel mixture from the second HTM for use as a gas turbine fuel;
- feeding retentate from the first and second HTMs to a third HTM;
- feeding a second portion of nitrogen produced in the ASU to the third HTM for use as a HTM permeate sweep stream;
- and
- recovering a second H2-N2 fuel mixture from the third HTM for use a duct burner fuel.
Dependencies are inferred from the claim text.