US5310337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration-resistant low NOx burner
Assignee: John Zink Co LLC
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Filing: 1993-05-27
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Granted: 1994-05-10
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Expires: 2013-05-27
Abstract
Abstract A low NO x burner includes a burner plate having a plurality of slots from which fuel gas jets and combustion air are discharged. A plurality of fuel tubes are aligned with the slots for discharging the fuel gas therethrough. The fuel tubes are spaced from the slots so that combustion air, provided by a wind box, also can flow through the slots. The fuel gas and combustion air are discharged at high velocity, thereby generating very high turbulence in the combustion chamber downstream from the burner. The slots are arranged such that the width of the recirculation zones between adjacent slots substantially varies between the central region of the burner plate and its perimeter. With this construction, the local ignition patterns vary such that local oscillations of flame front occur at different frequencies and are not synchronized so that vibrations are greatly dampened and resonance problems in the furnace minimized or eliminated. Preferably a gas nozzle is arranged at the center of the burner plate and is provided with fuel gas discharge ports to direct fuel gas in a direction tangential to the nozzle so as to induce gas exiting therefrom to swirl downstream from the burner plate. A spinner also is arranged around this central gas nozzle to cause combustion air channeled around the nozzle to swirl downstream from the nozzle. In this way, flame stability without air preheat is achieved with up to 110% excess air.
Inventors
- 👤 Vladimir Lifshits
- 👤 Steve B. Londerville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:10
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23C; F23C6/00; F23C6/04; F23C6/045; F23C6/047; F23C9/00; F23D14/20; F23D14/22; F23C2201/00; F23C2201/20; F23D2210/00; Y; Y02; Y02E; Y02E20/00; Y02E20/34
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
112 words
A burner comprising: a burner plate having a plurality of nonparallel, radically extending slots formed therethrough and arranged in a circular pattern adjacent a central region of said plate for introducing air and fuel gas into combustion chamber, the ratio of the distance between outer end portions of adjacent slots and inner end portions of adjacent slots is at least about 2:1 substantially varying between the central region and perimeter; and a plurality of burner tubes adapted to be coupled to a fuel source, each tube including a plurality of discharge openings and being oriented such that its discharge openings are aligned with one of said slots for directing fuel gas therethrough.
Claim 2
Dependent Claim
112 words
A burner comprising: a burner plate having a plurality of nonparallel, radically extending slots formed therethrough and arranged in a circular pattern adjacent a central region of said plate for introducing air and fuel gas into combustion chamber, the ratio of the distance between outer end portions of adjacent slots and inner end portions of adjacent slots is at least about 2:1 substantially varying between the central region and perimeter; and a plurality of burner tubes adapted to be coupled to a fuel source, each tube including a plurality of discharge openings and being oriented such that its discharge openings are aligned with one of said slots for directing fuel gas therethrough.
Claim 3
Dependent Claim
23 words
The burner of claim 1 wherein the ratio of the greatest and least distances between adjacent burner slots is at least about 2.5:1.
Claim 4
Dependent Claim
45 words
The burner of claim 1 wherein the ratio between the distance from each burner plate slot, measured from the outer surface of the burner plate, and the burner tube openings aligned therewith and the width of the burner plate slot is about 1.5:1 to 4:1.
Claim 5
Dependent Claim
38 words
The burner of claim 1 further including means for providing fuel gas to said tubes such that fuel gas is discharged from said tubes at a velocity sufficient to generate very high turbulence downstream from said burner plate.
Claim 6
Dependent Claim
15 words
The burner of claim 4 further including means or discharging combustion air from said slots.
Claim 7
Dependent Claim
130 words
A burner comprising: a burner plate having an outer surface for facing a combustion chamber, an inner surface, and a plurality of circumferentially arranged generally radially extending slots formed therethrough for introducing air and fuel gas into a combustion chamber; and a plurality of circumferentially arranged generally radially extending burner tubes each having an inner end portion adapted to be coupled to a fuel gas source and an outer end portion, each tube including a plurality of discharge openings and being oriented such that its discharge openings are aligned with one of said slots for directing fuel gas therethrough, said burner tubes further being oriented such that the ratio of the distance between outer end portions of adjacent slots and inner end portions of adjacent slots is at least 2:1.
Claim 8
Dependent Claim
130 words
A burner comprising: a burner plate having an outer surface for facing a combustion chamber, an inner surface, and a plurality of circumferentially arranged generally radially extending slots formed therethrough for introducing air and fuel gas into a combustion chamber; and a plurality of circumferentially arranged generally radially extending burner tubes each having an inner end portion adapted to be coupled to a fuel gas source and an outer end portion, each tube including a plurality of discharge openings and being oriented such that its discharge openings are aligned with one of said slots for directing fuel gas therethrough, said burner tubes further being oriented such that the ratio of the distance between outer end portions of adjacent slots and inner end portions of adjacent slots is at least 2:1.
Claim 9
Dependent Claim
29 words
The burner of claim 6 wherein the ratio between said distance between the outer end portions and said distance between the inner end portions is at least about 2.5:1.
Claim 10
Dependent Claim
45 words
The burner of claim 6 wherein the ratio between the distance from each burner plate slot, measured from the outer surface of the burner plate, and the burner tube openings aligned therewith and the width of the burner plate slot is about 1.5:1 to 4:1.
Claim 11
Dependent Claim
38 words
The burner of claim 6 further including means for providing fuel gas to said tubes such that fuel gas is discharged from said tubes at a velocity sufficient to generate very high turbulence downstream from said burner plate.
Claim 12
Dependent Claim
15 words
The burner of claim 9 further including means for discharging combustion air from said slots.
Claim 13
Dependent Claim
32 words
The burner of claim 6 wherein the openings in each of said burner tubes are arranged in a row which is substantially parallel to the center axis of the slot aligned therewith.
Claim 14
Dependent Claim
19 words
The burner of claim 6 wherein said burner plate is annular and the slots extend toward the perimeter thereof.
Claim 15
Dependent Claim
23 words
The burner of claim 6 wherein the width of each slot increases as the slot approaches the outer perimeter of said burner plate.
Claim 16
Dependent Claim
51 words
The burner of claim 6 further including a central gas nozzle arranged at the center of said burner plate, said gas nozzle having fuel gas discharge ports oriented to direct fuel gas in a direction tangential to the nozzle to induce gas exiting therefrom to swirl downstream from the burner plate.
Claim 17
Dependent Claim
15 words
The burner of claim 14 further including a spinner arranged about said central gas nozzle.
Claim 18
Dependent Claim
51 words
The burner of claim 6 including at least 3 of said burner tubes, the angle formed between one burner tube and the burner tube adjacent thereto in the clockwise direction substantially differing from the angle formed between said one burner tube and the burner tube adjacent thereto in the counterclockwise direction.
Claim 19
Dependent Claim
90 words
A burner comprising: a burner plate having a plurality of generally circumferentially arranged radially extending slots formed therethrough for introducing air and fuel gas into a combustion chamber; and a plurality of generally circumferentially arranged radially extending burner tubes, each having a plurality of discharge openings aligned with one of said slots, the angle formed between one burner tube and the burner tube adjacent thereto in the clockwise direction substantially differing from the angle formed between said one burner tube and the burner tube adjacent thereto in the counterclockwise direction.
Claim 20
Dependent Claim
90 words
A burner comprising: a burner plate having a plurality of generally circumferentially arranged radially extending slots formed therethrough for introducing air and fuel gas into a combustion chamber; and a plurality of generally circumferentially arranged radially extending burner tubes, each having a plurality of discharge openings aligned with one of said slots, the angle formed between one burner tube and the burner tube adjacent thereto in the clockwise direction substantially differing from the angle formed between said one burner tube and the burner tube adjacent thereto in the counterclockwise direction.
Claim 21
Dependent Claim
38 words
The burner of claim 17 further including means for providing fuel gas to said tubes such that fuel gas is discharged from said tubes at a velocity sufficient for generating very high turbulence downstream from the burner plate.
Claim 22
Dependent Claim
13 words
The burner of claim 17 including at least 3 of said burner tubes.
Claim 23
Dependent Claim
45 words
The burner of claim 17 wherein the ratio between the distance from each burner plate slot, measured from the outer surface of the burner plate, and the burner tube openings aligned therewith and the width of the burner plate slot is about 1.5:1 to 4:1.
Claim 24
Dependent Claim
19 words
The burner of claim 17 wherein the openings in each of said burner tubes are aligned in a row.
Claim 25
Dependent Claim
21 words
The burner of claim 21 wherein each row of openings is substantially parallel to the center axis of the corresponding slot.
Claim 26
Dependent Claim
19 words
The burner of claim 17 wherein said burner plate is annular and the slots extend toward the perimeter thereof.
Claim 27
Dependent Claim
23 words
The burner of claim 17 wherein the width of each slot increases as the slot approaches the outer perimeter of said burner plate.
Claim 28
Dependent Claim
54 words
The burner of claim 17 further including a central gas nozzle arranged at the center of said burner plate, said gas nozzle having fuel gas discharge ports oriented to direct fuel gas in a direction tangential to the nozzle to induce gas exiting therefrom to swirl in the region downstream from the burner plate.
Claim 29
Dependent Claim
15 words
The burner of claim 25 further including a spinner arranged about said central gas nozzle.
Claim 30
Dependent Claim
46 words
The burner of claim 17 wherein each burner tube includes an outer end portion and an inner end portion, the outer end portions of adjacent burner tubes being spaced apart a distance substantially greater than the distance between the inner end portions of said adjacent tubes.
References Cited (Backward Citations)
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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) | 1997-05-09 | 1997-11-08 | 1998-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-09 | 2001-11-08 | 2002-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-09 | 2005-11-08 | 2006-05-10 | $7700.00 | Window Closed / Lapsed |