US4299086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Utilization of energy obtained by substoichiometric combustion of low heating value gases
Assignee: Chevron USA Inc
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Filing: 1978-12-07
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Granted: 1981-11-10
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Expires: 1998-12-07
Abstract
Abstract The combustible component of a gas stream of low heating value is combusted using less than a stoichiometric amount of oxygen in the presence of an oxygenation catalyst and the heat energy in the combusted gas is utilized, for example, by expansion in a gas turbine.
Inventors
- 👤 Ajay M. Madgavkar
- 👤 Roger F. Vogel
- 👤 Harold E. Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:51
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/40; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J38/00; B01J38/04; B01J38/12; F02; F02C; F02C3/00; F02C3/20; F02C3/22; F02C6/00; F02C6/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
126 words
A method for the recovery of energy from a gas stream which has a heating value that varies with time and has an average heating value in the range of about 5 to about 200 Btu/scf. and comprising a combustible component selected from carbon monoxide and up to about 50 mol percent hydrogen, the method which comprises the steps passing said gas stream admixed with a substantially constant rate of air for combustion at an overall average air equivalence ratio of between about 0.2 and about 0.9 in contact with an oxidation catalyst in at least one combustion zone at a temperature high enough to initiate and maintain combustion of said gas stream, and utilizing the heat energy produced in said gas stream by said combustion.
Claim 2
Independent Claim
126 words
A method for the recovery of energy from a gas stream which has a heating value that varies with time and has an average heating value in the range of about 5 to about 200 Btu/scf. and comprising a combustible component selected from carbon monoxide and up to about 50 mol percent hydrogen, the method which comprises the steps passing said gas stream admixed with a substantially constant rate of air for combustion at an overall average air equivalence ratio of between about 0.2 and about 0.9 in contact with an oxidation catalyst in at least one combustion zone at a temperature high enough to initiate and maintain combustion of said gas stream, and utilizing the heat energy produced in said gas stream by said combustion.
Claim 3
Dependent Claim
33 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the combustible component comprises a mixture of carbon monoxide and hydrogen in equal molar amounts.
Claim 4
Dependent Claim
30 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the gas stream contains up to about two weight percent hydrogen sulfide.
Claim 5
Dependent Claim
33 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the catalyst contains between about 0.005 and about ten weight percent platinum on a support.
Claim 6
Dependent Claim
33 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the catalyst contains between about 0.01 and about seven weight percent platinum on a support.
Claim 7
Dependent Claim
35 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the average heating value of said gas stream is between about 15 Btu/scf. and about 150 Btu/scf.
Claim 8
Dependent Claim
34 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the average heating value of said gas stream is between about 30 and about 100 Btu/scf.
Claim 9
Dependent Claim
37 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the gas stream to the combustion zone is heated to combustion temperature by heat exchange with the combusted gas.
Claim 10
Dependent Claim
35 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the gas stream following combustion is expanded in a gas turbine for the delivery of mechanical energy.
Claim 11
Dependent Claim
36 words
A method for the recovery of energy from a gas stream in accordance with claim 9 in which the pressure of the combusted gas stream fed to the gas turbine is at least about 75 psi.
Claim 12
Dependent Claim
47 words
A method for the recovery of energy from a gas stream in accordance with claim 9 in which the said gas stream and a portion of the air required for partial combustion is passed in contact with each of two oxidation catalysts in series in two stages.
Claim 13
Dependent Claim
37 words
A method for the recovery of energy from a gas stream in accordance with claim 11 in which at least one-third of said combustion air is added to the gas stream prior to combustion in each stage.
Claim 14
Dependent Claim
31 words
A method for the recovery of energy from a gas stream in accordance with claim 12 in which about fifty percent of said combustion air is added prior to each stage.
Claim 15
Dependent Claim
39 words
A method for the recovery of energy from a gas stream in accordance with claim 1 in which the air feed rate will not result in a substantial stoichiometric excess of oxygen during a period of minimum heating value.
References Cited (Backward Citations)
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Cited
GB741506A
Cited
US3731485A
Cited
US3928961A
Cited
US3982879A
Cited
US4054407A
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US4191733A
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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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |