US5209656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion system for high velocity gas injection
Assignee: Praxair Technology Inc
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Filing: 1991-08-29
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Granted: 1993-05-11
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Expires: 2011-08-29
Abstract
Abstract High velocity gas injection system wherein high velocity and low velocity gases are injected into a cavity in a defined relationship such that the low velocity gas forms a protective barrier from combustion zone damage due to the flow dynamics caused by the high velocity gas.
Inventors
- 👤 Hisashi Kobayashi
- 👤 Arthur W. Francis, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:08
CPC Classifications
F; F27; F27D; F27D99/00; F27D99/0001; F27D99/0033; F23; F23C; F23C7/00; F23C7/02; C; C03; C03B; C03B5/00; C03B5/16; C03B5/235; C03B5/2353; F02; F02B; F02B31/00; F02B31/08; F23C9/00; F23C9/006; F23D; F23D14/00; F23D14/46; F23D14/72; F23D14/76; F02B2275/00; F02B2275/18; F23C2900/00; F23C2900/07021; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
A combustion system comprising at least one gas injection means for injecting fuel and at least one gas injection means for injecting oxidant into a combustion zone at least one of said gas injection means comprising: (A) a cavity having an opening with a diameter D communicating with the combustion zone; (B) a nozzle for injecting high velocity main gas into the cavity toward the opening positioned at a recess from the opening, said recess having a length L such that L/D is not more than 3.0; and (C) means for providing low velocity protective gas having a composition substantially the same as that of the high velocity main gas into the cavity at a point further recessed from the opening than is the nozzle, for flow of protective gas around and past the nozzle.
Claim 2
Dependent Claim
135 words
A combustion system comprising at least one gas injection means for injecting fuel and at least one gas injection means for injecting oxidant into a combustion zone at least one of said gas injection means comprising: (A) a cavity having an opening with a diameter D communicating with the combustion zone; (B) a nozzle for injecting high velocity main gas into the cavity toward the opening positioned at a recess from the opening, said recess having a length L such that L/D is not more than 3.0; and (C) means for providing low velocity protective gas having a composition substantially the same as that of the high velocity main gas into the cavity at a point further recessed from the opening than is the nozzle, for flow of protective gas around and past the nozzle.
Claim 3
Dependent Claim
28 words
The combustion system of claim 1 wherein each of said fuel gas injection means and said oxidant gas injection means comprises the elements of (A), (B) and (C).
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 wherein the cavity has a cylindrical configuration.
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 wherein the cavity has a conical configuration.
Claim 6
Dependent Claim
20 words
The apparatus of claim 1 wherein the opening has a diameter within the range of from 0.25 to 10 inches.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein L/D is within the range of from 0.5 to 3.0.
Claim 8
Dependent Claim
21 words
The apparatus of claim 1 wherein the nozzle has a diameter less than 0.5 times the diameter D of the opening.
Claim 9
Dependent Claim
36 words
The apparatus of claim 1 further comprising a conduit for supplying main gas to the nozzle wherein the protective gas provision means comprises a conduit coaxial with the main gas conduit terminating upstream of the nozzle.
Claim 10
Dependent Claim
39 words
The apparatus of claim 1 further comprising a conduit for supplying main gas to the nozzle wherein the protective gas provision means comprises a bleed line upstream of the nozzle within the main gas conduit communicating with the cavity.
References Cited (Backward Citations)
US2206070A
Cited
US3676060A
Cited
US3748087A
Cited
US3836315A
Cited
DE2449986A1
Cited
SU779737A1
Cited
US4373205A
Cited
US4541796A
Cited
US4541798A
Cited
US4693680A
Cited
US4878829A
Cited
US4907961A
Cited
US5000677A
Cited
US4892475A
Cited
US4969814A
Cited
US4946382A
Cited
US4988285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |