US5174866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen recovery from turbine exhaust using solid electrolyte membrane
Assignee: Air Products and Chemicals Inc
•
Filing: 1992-02-12
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Granted: 1992-12-29
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Expires: 2012-02-12
Abstract
Abstract A process is provided for extracting high purity oxygen from a gas generator turbine exhaust stream by passing the turbine exhaust over the feed side of solid electrolyte membrane selective to the permeation of oxygen over other components of the exhaust stream to separate the oxygen from the exhaust stream, and removing the oxygen product stream from the permeate side of the membrane. The reject exhaust stream is then passed through a power generating turbine to recover net power.
Inventors
- 👤 Michael S. Chen
- 👤 William P. Hegarty
- 👤 William A. Steyert, deceased
- 👤 executrix by Lila O. Steyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:15
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0251; B; B01; B01D; B01D53/00; B01D53/32; B01D53/326; C01B2210/00; C01B2210/0043; C01B2210/0046
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
139 words
A process for oxygen coproduction and net power generation, comprising: (a) combusting a fuel with air to produce a combustion product stream, (b) expanding the combustion product stream through a turbine of a gas generator, (c) recovering oxygen from a resulting about 850° to about 1800° F. temperature and about 0.2 to about 100 psig pressure exhaust stream from said gas generator turbine which stream contains from about 5 to about 18% by volume of oxygen, which recovery comprises passing the exhaust stream over a feed side of a solid electrolyte membrane selective to the permeation of oxygen over other components of the stream to separate oxygen from the exhaust stream and removing the oxygen from the permeate side of the membrane, and (d) then further expanding the exhaust stream through a power generating turbine to recover net power.
Claim 2
Dependent Claim
139 words
A process for oxygen coproduction and net power generation, comprising: (a) combusting a fuel with air to produce a combustion product stream, (b) expanding the combustion product stream through a turbine of a gas generator, (c) recovering oxygen from a resulting about 850° to about 1800° F. temperature and about 0.2 to about 100 psig pressure exhaust stream from said gas generator turbine which stream contains from about 5 to about 18% by volume of oxygen, which recovery comprises passing the exhaust stream over a feed side of a solid electrolyte membrane selective to the permeation of oxygen over other components of the stream to separate oxygen from the exhaust stream and removing the oxygen from the permeate side of the membrane, and (d) then further expanding the exhaust stream through a power generating turbine to recover net power.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the gas turbine exhaust stream passes over a solid electrolyte membrane having a temperature of from about 1000° to about 1800° F.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein from about 2 to about 80% of the oxygen in the gas turbine exhaust stream is recovered.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the oxygen ionic potential is maintained on the membrane by situating the membrane between two electrodes positioned to apply external voltage across the membrane surface.
Claim 6
Dependent Claim
29 words
The process of claim 4 wherein the partial pressure of oxygen on the feed side of the membrane is lower than that on the permeate side of the membrane.
Claim 7
Dependent Claim
26 words
The process of claim 4 wherein a current density of 0.05 to 2 amperes/cm2 is applied across a 10 to 1000 micron thick solid electrolyte membrane.
Claim 8
Dependent Claim
15 words
The process of claim 4 wherein the exhaust gas stream contacts two or more membranes.
Claim 9
Dependent Claim
14 words
The process of claim 7 wherein the membranes are connected in series or parallel.
Claim 10
Dependent Claim
21 words
The process of claim 2 wherein the membrane is made of mixed conductors with mixed conductivity for oxygen ions and electrons.
Claim 11
Dependent Claim
23 words
The process of claim 9 wherein the partial pressure of oxygen on the permeate side is lower than that on the feed side.
Claim 12
Dependent Claim
20 words
The process of claim 2 wherein an oxygen-depleted exhaust stream of step (d) is fed through a heat recovery system.
Claim 13
Dependent Claim
20 words
The process of claim 2 wherein the gas turbine exhaust stream contacts a doped zirconia membrane for separation of oxygen.
Claim 14
Dependent Claim
22 words
The process of claim 2 wherein the gas turbine exhaust stream passes over a doped bismuth oxide membrane for separation of oxygen.
Claim 15
Dependent Claim
23 words
The process of claim 2 wherein the gas turbine exhaust stream passes over a Co--Sr--Bi oxide mixed conductor membrane for separation of oxygen.
Claim 16
Dependent Claim
23 words
The process of claim 2 wherein the gas turbine exhaust stream passes over a Co--La--Bi oxide mixed conductor membrane for separation of oxygen.
Claim 17
Dependent Claim
23 words
The process of claim 2 wherein the gas turbine exhaust stream passes over a Co--Sr--Ce oxide mixed conductor membrane for separation of oxygen.
Claim 18
Dependent Claim
23 words
The process of claim 2 wherein the gas turbine exhaust stream passes over a Co--La--Ce oxide mixed conductor membrane for separation of oxygen.
Claim 19
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) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |