Patent US5035727A successfully refreshed from Google Patents.
US5035727A
Expired / Lapsed
US
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Oxygen extraction from externally fired gas turbines
Assignee: Air Products and Chemicals Inc
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Filing: 1990-05-24
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Granted: 1991-07-30
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Expires: 2010-05-24
Abstract
Abstract A process is provided for recovering oxygen from an externally fired power generating gas turbine system in which a hot, compressed air stream from a compressor to be expanded through a turbine expander to generate power is first passed over the feed side of a solid electrolyte membrane selective to the permeation of oxygen over other components of the air while a positive oxygen ionic potential is maintained on the membrane to separate oxygen from the stream, and removing the oxygen from the permeate side of the membrane before the residual air is expanded through the turbine expander to generate power.
Inventors
- 👤 Michael S. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:58
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0251; B; B01; B01D; B01D53/00; B01D53/22; B01D53/32; B01D53/326; C01B2210/00; C01B2210/0043; C01B2210/0046; C01B2210/0078; C01B2210/0082
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
A process for recovering oxygen from an externally fired power generating gas turbine system in which a hot, compressed air stream from a compressor is expanded through a turbine expander to generate power, which process comprises compressing air to make a hot, compressed air stream, further heating the air stream from the compressor with a hot combustion effluent from an external combustor, passing the hot, compressed air from the compressor over the feed side of a solid electrolyte membrane selective to the permeation of oxygen over other components of the air, maintaining a positive oxygen ionic potential on the membrane to separate oxygen from the air stream by situating the membrane between two electrodes positioned to apply external voltage across the membrane surface, removing oxygen from the permeate side of the membrane before expanding the residual air through the turbine expander to generate power and combusting the air expanded through the turbine expander with fuel in the external combustor and feeding the hot combustion effluent to a heat exchanger to further heat the hot compressed air stream.
Claim 2
Dependent Claim
177 words
A process for recovering oxygen from an externally fired power generating gas turbine system in which a hot, compressed air stream from a compressor is expanded through a turbine expander to generate power, which process comprises compressing air to make a hot, compressed air stream, further heating the air stream from the compressor with a hot combustion effluent from an external combustor, passing the hot, compressed air from the compressor over the feed side of a solid electrolyte membrane selective to the permeation of oxygen over other components of the air, maintaining a positive oxygen ionic potential on the membrane to separate oxygen from the air stream by situating the membrane between two electrodes positioned to apply external voltage across the membrane surface, removing oxygen from the permeate side of the membrane before expanding the residual air through the turbine expander to generate power and combusting the air expanded through the turbine expander with fuel in the external combustor and feeding the hot combustion effluent to a heat exchanger to further heat the hot compressed air stream.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein the hot compressed air stream passing over the solid electrolyte membrane is at a temperature of about 1960° F. and a pressure of about 230 psig.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein from about 23% of the oxygen in the air stream is recovered.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the partial pressure of oxygen on the feed side is lower than that one the permeate side.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein the air stream is passed over two or more membranes.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein the membrane is made of mixed conductors with mixed conductivity for oxygen ions and electrons.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein the air stream is passed over a doped zirconia membrane.
Claim 9
Dependent Claim
17 words
The process of claim 6 wherein the air stream is passed over a doped bismuth oxide membrane.
Claim 10
Dependent Claim
23 words
The process of claim 1 which comprises feeding the effluent from the heat exchanger to a steam generating unit to recover additional power.
Claim 11
Dependent Claim
18 words
The process of claim 1 which comprises passing a sweep gas over the permeate side of the membrane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |