US4969814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple oxidant jet combustion method and apparatus
Assignee: Praxair Technology Inc
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Filing: 1989-05-08
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Granted: 1990-11-13
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Expires: 2009-05-08
Abstract
Abstract Method and apparatus to carry out combustion in a burner (10) with more uniform temperature distribution and with reduced NOx generation comprising oxidant injection through a nozzle (1) having straight (12) and angled (13) orifices with aspiration of gas into the angled oxidant (20) and downstream (23) consolidation of the oxidant streams (20, 22).
Inventors
- 👤 Min-Da Ho
- 👤 Paul J. Liszewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:24
CPC Classifications
F; F23; F23D; F23D11/00; F23C; F23C7/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
122 words
A method for combusting fuel and oxidant to achieve more uniform temperature distribution and reduced NO x emissions comprising: (A) passing a fuel stream through a combustion zone; (B) injecting oxidant into the combustion zone in at least two streams, at least one such oxidant stream being injected substantially parallel to the fuel stream and at least one such oxidant stream being injected at an outward angle to the parallel injected oxidant stream(s); (C) aspirating gas from within the combustion zone into the angularly injected oxidant stream(s) and thereafter flowing the angularly injected stream(s) into at least one of the parallel injected oxidant stream(s); and (D) mixing the resulting oxidant stream(s) with fuel to form a combustible mixture and combusting the mixture.
Claim 2
Independent Claim
122 words
A method for combusting fuel and oxidant to achieve more uniform temperature distribution and reduced NO x emissions comprising: (A) passing a fuel stream through a combustion zone; (B) injecting oxidant into the combustion zone in at least two streams, at least one such oxidant stream being injected substantially parallel to the fuel stream and at least one such oxidant stream being injected at an outward angle to the parallel injected oxidant stream(s); (C) aspirating gas from within the combustion zone into the angularly injected oxidant stream(s) and thereafter flowing the angularly injected stream(s) into at least one of the parallel injected oxidant stream(s); and (D) mixing the resulting oxidant stream(s) with fuel to form a combustible mixture and combusting the mixture.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the oxidant comprises at least 25 percent oxygen.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the angle of the angularly injected oxidant is within the range of from 10 to 45 degrees.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein the angularly injected oxidant is injected at a velocity within the range of from 150 to 1000 feet per second.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein the parallel injected oxidant is injected at a velocity within the range of from 150 to 1000 feet per second
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the angularly injected oxidant is injected in a plurality of streams.
Claim 8
Dependent Claim
20 words
The method of claim 6 wherein the injection angle of each of the angularly injected oxidant streams is the same.
Claim 9
Dependent Claim
18 words
The method of claim 6 wherein the angularly injected oxidant streams have at least two different injection angles.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein the angularly injected oxidant and parallel injected oxidant are injected with an intervening distance not exceeding ten diameters of the largest diameter injected stream.
Claim 11
Dependent Claim
24 words
The method of claim 1 wherein the fuel is injected into the combustion zone and passed through the combustion zone as an aerodynamic stream.
Claim 12
Dependent Claim
26 words
The method of claim 10 wherein the fuel stream is injected into the combustion zone as a centrally located stream within a ring of oxidant streams.
Claim 13
Dependent Claim
26 words
The method of claim 1 wherein the oxidant is injected into the combustion zone spaced from the point where fuel is introduced into the combustion zone.
Claim 14
Dependent Claim
102 words
Apparatus for combusting fuel and oxidant to achieve more uniform temperature distribution and reduced NO x emissions comprising: (A) means for passing a fuel stream through a combustion zone; and (B) means for injecting oxidant into the combustion zone, said oxidant injection means comprising a nozzle having at least three orifices, at least one such orifice oriented so as to inject an oxidant stream substantially parallel to the passing direction of the fuel passing means, and a plurality of orifices each oriented so as to inject an oxidant stream at an outward angle to the injection direction of said parallel oriented orifice.
Claim 15
Dependent Claim
102 words
Apparatus for combusting fuel and oxidant to achieve more uniform temperature distribution and reduced NO x emissions comprising: (A) means for passing a fuel stream through a combustion zone; and (B) means for injecting oxidant into the combustion zone, said oxidant injection means comprising a nozzle having at least three orifices, at least one such orifice oriented so as to inject an oxidant stream substantially parallel to the passing direction of the fuel passing means, and a plurality of orifices each oriented so as to inject an oxidant stream at an outward angle to the injection direction of said parallel oriented orifice.
Claim 16
Dependent Claim
16 words
The apparatus of claim 13 wherein the angle of each angularly oriented orifice is the same.
Claim 17
Dependent Claim
18 words
The apparatus of claim 13 wherein the angularly oriented orifices are oriented at at least two different angles.
Claim 18
Dependent Claim
27 words
The apparatus of claim 13 wherein the distance between the parallel oriented orifice and an angularly oriented orifice does not exceed ten diameters of the largest orifice.
Claim 19
Dependent Claim
23 words
The apparatus of claim 13 wherein the angle of the angularly oriented orifice is within the range of from 10 to 45 degrees.
Claim 20
Dependent Claim
15 words
The apparatus of claim 13 wherein the fuel passing means comprises a fuel injection nozzle
Claim 21
Dependent Claim
23 words
The apparatus of claim 18 comprising a plurality of oxidant nozzles arranged in a circular pattern around a centrally located fuel injection nozzle.
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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) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |