EP0019386A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for flame modification to reduce NOx-emissions
Assignee: Atlantic Richfield Co
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Filing: 1980-04-28
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Granted: —
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Expires: 2000-04-28
Abstract
Abstract Method and apparatus for reducing the concentration of NOx emissions of a flame having a temperature above 925°C (1700°F), especially a flame of the oil-fired and air-sustained kind, by causing at least portion of the post ignition combustion products of the flame to flow in a non-turbulent, preferably laminar, pattern. The apparatus may comprise an array of spaced vanes some of which are preferably planar and some of which are preferably shaped to impose a curved flow path on said products.
Inventors
- 👤 Jesse Eugene Sheets
- 👤 Tai Siang Chao
- 👤 Bernard Charles Vitchus
- 👤 Martin Francis Zygowicz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 16:07
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/36; F23D11/40; F23D11/404; F23M; F23M9/00; F23M9/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
53 words
Apparatus for reducing NO emissions in a flame having a temperature above about 925 0 C (1700°F) by modifying the flow pattern of post ignition combustion products of said flame, comprising means for causing at least a portion of the post ignition combustion products of said flame to flow in a non-turbulent pattern.
Claim 2
Dependent Claim
53 words
Apparatus for reducing NO emissions in a flame having a temperature above about 925 0 C (1700°F) by modifying the flow pattern of post ignition combustion products of said flame, comprising means for causing at least a portion of the post ignition combustion products of said flame to flow in a non-turbulent pattern.
Claim 3
Dependent Claim
28 words
Apparatus as claimed in claim 1, wherein said means comprise an array of vanes adapted to cause a laminar flow of at least a portion of said flame.
Claim 4
Dependent Claim
51 words
Apparatus as claimed in claim 2, wherein at least a portion of said vanes are shaped so as to cause a recycle flow of at least a portion of said flame which has been caused to flow in a non-turbulent pattern back into a portion of said flame which is turbulent.
Claim 5
Dependent Claim
78 words
Apparatus to cause a laminar flow pattern in at least a portion of a flame, said apparatus comprising an array of spaced vanes capable of withstanding the environment of a flame and having a plurality of passageways therebetween, at least a first portion of said vanes being substantially planar and a second portion of said vanes being shaped so as to cause a curved flow path upon post emission products of said flow which comes into contact therewith.
Claim 6
Dependent Claim
78 words
Apparatus to cause a laminar flow pattern in at least a portion of a flame, said apparatus comprising an array of spaced vanes capable of withstanding the environment of a flame and having a plurality of passageways therebetween, at least a first portion of said vanes being substantially planar and a second portion of said vanes being shaped so as to cause a curved flow path upon post emission products of said flow which comes into contact therewith.
Claim 7
Dependent Claim
21 words
Apparatus as claimed in claim 4, wherein said first portion is spaced between at least two sections of said second portion.
Claim 8
Dependent Claim
28 words
Apparatus as claimed in claim 4, wherein at least a portion of said second portion is part of at least a portion of the periphery of said array.
Claim 9
Dependent Claim
64 words
Apparatus as claimed in any one of claims 2 to 6, wherein said vanes have thicknesses in the range of about 1.6 mm to 12.7 mm (1/16 to ½ inch), and widths in the range of about 6.35 mm to 51 mm (½ to 3 inches),and the spaces therebetween are in the range of about 4.75 mm to 19 mm (3/16 to % inch.).
Claim 10
Independent Claim
42 words
A method for reducing NO x emissions in a turbulent flame having a temperature in the range of about 925°C to 1925°C (1700°F to 3500°F), s'aid method comprising causing at least a portion of said flame to flow in a non-turbulent pattern.
Claim 11
Independent Claim
42 words
A method for reducing NO x emissions in a turbulent flame having a temperature in the range of about 925°C to 1925°C (1700°F to 3500°F), s'aid method comprising causing at least a portion of said flame to flow in a non-turbulent pattern.
Claim 12
Dependent Claim
13 words
A method as claimed in claim 8, wherein the non-turbulent pattern is laminar.
Claim 13
Dependent Claim
46 words
A method as claimed in claim 8 or claim 9, wherein at least a portion of said flame which has been caused to flow in a non- . turbulent pattern is at least in part recycled back into a portion of said flame which is turbulent.
Claim 14
Independent Claim
55 words
A method for reducing NO x emissions in a turbulent flame having a temperature in the range of about 925°C to 1925°C (1700°F to 3500°F) and having a smoke plane, said method comprising locating in said flame an apparatus as claimed in any one of claims 1 to 7 down stream from said smoke plane.
Claim 15
Dependent Claim
40 words
A method as claimed in claim 11, wherein the distance down stream from said smoke plane, as measured between said smoke plane and a leading edge of said apparatus is up to about sixty percent of the free flame length.
References Cited (Backward Citations)
No citation records indexed.
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