US3833337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flarestacks
Assignee: BP PLC
•
Filing: 1972-04-18
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Granted: 1974-09-03
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Expires: 1992-04-18
Abstract
Abstract A flare stack burner tip using the Coanda effect, the bore of the Coanda body is used as a feed line for high pressure gas and the Coanda director surface is positioned across the outlet of the high pressure gas line so as to cause entrainment of air into the fuel gas stream. The feature of the invention is a self adjusting slot between the Coanda surface and gas inlet which adjusts itself automatically to the flow rate of high pressure gas so that a substantially constant pressure is maintained.
Inventors
- 👤 D Desty
- 👤 C Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:58
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/06; F23G7/08; Y; Y10; Y10S; Y10S239/00; Y10S239/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
A flarestack burner tip, comprising: a high pressure gas conduit line terminating in a generally vertical portion; a Coanda body positioned over the upper end of said high pressure gas conduit Line, said Coanda body having an external deflector surface positioned adjacent to and extending completely across the upper end of said high pressure gas conduit line, said deflector surface including a substantially horizontal portion adapted to form a circumferentially extending slot with the upper end of said high pressure gas conduit upon said Coanda body being spaced therefrom and a curved portion extending outwardly from said high pressure gas conduit line and tangentially to said horizontal portion, said slot adapted to direct high pressure gas over said curved portion of said Coanda deflector surface; and wherein said Coanda body is fixedly mounted with respect to said high pressure gas conduit line and the latter includes a flexible bellows section pemitting the upper end of said high pressure gas conduit line to freely move toward and away from said Coanda body responsive to the pressure of the flow of said high pressure gas to thereby maintain a substantially constant pressure on the gas passing through said slot.
Claim 2
Dependent Claim
197 words
A flarestack burner tip, comprising: a high pressure gas conduit line terminating in a generally vertical portion; a Coanda body positioned over the upper end of said high pressure gas conduit Line, said Coanda body having an external deflector surface positioned adjacent to and extending completely across the upper end of said high pressure gas conduit line, said deflector surface including a substantially horizontal portion adapted to form a circumferentially extending slot with the upper end of said high pressure gas conduit upon said Coanda body being spaced therefrom and a curved portion extending outwardly from said high pressure gas conduit line and tangentially to said horizontal portion, said slot adapted to direct high pressure gas over said curved portion of said Coanda deflector surface; and wherein said Coanda body is fixedly mounted with respect to said high pressure gas conduit line and the latter includes a flexible bellows section pemitting the upper end of said high pressure gas conduit line to freely move toward and away from said Coanda body responsive to the pressure of the flow of said high pressure gas to thereby maintain a substantially constant pressure on the gas passing through said slot.
Claim 3
Dependent Claim
238 words
A flarestack burner tip, comprising: a high pressure gas conduit line terminating in a generally vertical portion; a Coanda body positioned over the upper end of said high pressure gas conduit line, said Coanda body having an external deflector surface positioned adjacent to and extending completely across the upper end of said high pressure gas conduit line, said deflector surface including a substantially horizontal portion adapted to form a circumferentially extending slot with the upper end of said high pressure gas conduit upon said Coanda body being spaced therefrom, a curved portion extending outwardly from said high pressure gas conduit line and tangentially to said horizontal portion, and terminating in a tapered portion extending in a general vertical direction tangentially to said curved deflector surface portion, said slot adapted to direct high pressure gas over said curved portion of said Coanda deflector surface; said Coanda body further including a low pressure fuel gas conduit line extending internally through said Coanda body adapted to supply a low pressure fuel gas into the flow of high pressure fuel gas and entrained atmospheric air from the external surface of said Coanda body; and means mounting said Coanda body for free vertical movement with respect to the upper end of said high pressure gas conduit line responsive to the pressure of the flow of said high pressure gas to thereby maintain a substantially constant pressure on the gas passing through the slot.
Claim 4
Dependent Claim
238 words
A flarestack burner tip, comprising: a high pressure gas conduit line terminating in a generally vertical portion; a Coanda body positioned over the upper end of said high pressure gas conduit line, said Coanda body having an external deflector surface positioned adjacent to and extending completely across the upper end of said high pressure gas conduit line, said deflector surface including a substantially horizontal portion adapted to form a circumferentially extending slot with the upper end of said high pressure gas conduit upon said Coanda body being spaced therefrom, a curved portion extending outwardly from said high pressure gas conduit line and tangentially to said horizontal portion, and terminating in a tapered portion extending in a general vertical direction tangentially to said curved deflector surface portion, said slot adapted to direct high pressure gas over said curved portion of said Coanda deflector surface; said Coanda body further including a low pressure fuel gas conduit line extending internally through said Coanda body adapted to supply a low pressure fuel gas into the flow of high pressure fuel gas and entrained atmospheric air from the external surface of said Coanda body; and means mounting said Coanda body for free vertical movement with respect to the upper end of said high pressure gas conduit line responsive to the pressure of the flow of said high pressure gas to thereby maintain a substantially constant pressure on the gas passing through the slot.
Claim 5
Dependent Claim
41 words
A flarestack burner tip as claimed in claim 1, wherein said curved portion of said Coanda deflector surface comprises a surface of revolution formed by the rotation of a quadrant of a circle about the longitudinal axis of the Coanda body.
Claim 6
Dependent Claim
47 words
A flarestack burner tip as claimed in claim 1, wherein said Coanda body includes a generally centrally disposed spindle member extending downwardly from said horizontal portion of said deflector surface into telescoping freely slidable movement with guide means fixedly mounted within said high pressure gas conduit line.
Claim 7
Dependent Claim
30 words
A flarestack burner tip as claimed in claim 1, including spring means adapted to provide an external load to said flexible bellows section of said high pressure gas conduit line.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |