US3861859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling of rotary furnace shell burner pipes and method
Assignee: Individual
•
Filing: 1972-07-31
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Granted: 1975-01-21
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Expires: 1992-07-31
Abstract
Abstract Overheating of rotary kiln shell burner pipes has resulted in serious deterioration and severely limited service life in a number of operating furnace installations. Various measures have been applied in attempts to solve this problem, but with only limited success. This invention provides a positive solution by use of forced cooling employing an array of high-velocity air jets directed to impinge directly on the inner burner pipe walls. The apparatus includes an assembly of internal cooling header ducting within the burner pipe in an annular configuration, supplied with air under pressure, and equipped with an array of spaced jet nozzle openings through which cooling air jets are directed to impinge on the inner pipe surface, thereby effecting accelerated and continuous cooling of the burner pipe as it operates in the hot furnace atmosphere.
Inventors
- 👤 William Lyon Sherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:48
CPC Classifications
F; F23; F23C; F23C99/00; C; C21; C21B; C21B13/00; C21B13/08; F23D; F23D14/00; F23D14/46; F23D14/72; F23D14/78; F23M; F23M5/00; F23M5/08; F23M5/085; F27; F27B; F27B7/00; F27B7/20; F27B7/34; F23C2700/00; F23C2700/02; F23C2700/023
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
In a rotary furnace in which blowing media for combustion is supplied through a shell burner pipe projeCting radially into the furnace interior, the method for cooling the burner pipes comprising the steps of: a. positioning cooling header ducting within the shell burner pipe adjacent the inner burner pipe walls and supplying gaseous cooling media to said cooling header ducting; maintaining said gaseous cooling media under a greater positive pressure within said cooling header ducting than the pressure of said blowing media for combustion within said shell burner pipe; c. directing jets of said gaseous cooling media at substantial velocity in an array of cooling media jets impinging directly against the inner side walls of said burner pipe, said jets issuing from an array of jet nozzle openings in said cooling header ducting.
Claim 2
Dependent Claim
133 words
In a rotary furnace in which blowing media for combustion is supplied through a shell burner pipe projeCting radially into the furnace interior, the method for cooling the burner pipes comprising the steps of: a. positioning cooling header ducting within the shell burner pipe adjacent the inner burner pipe walls and supplying gaseous cooling media to said cooling header ducting; maintaining said gaseous cooling media under a greater positive pressure within said cooling header ducting than the pressure of said blowing media for combustion within said shell burner pipe; c. directing jets of said gaseous cooling media at substantial velocity in an array of cooling media jets impinging directly against the inner side walls of said burner pipe, said jets issuing from an array of jet nozzle openings in said cooling header ducting.
Claim 3
Dependent Claim
21 words
The method according to claim 1 in which the impingement velocity of said gaseous cooling media exceeds 100 feet per second.
Claim 4
Dependent Claim
39 words
The method according to claim 1 in which said pressure of the gaseous cooling media within said header ducting is at least twice as great as the average pressure of said blowing media for combustion within the burner pipe.
Claim 5
Dependent Claim
57 words
The method according to claim 1 in which said positive pressure and thereby the impingement velocity of said gaseous cooling media is maintained substantially constant, independently of the velocity of the blowing media for combustion flowing through said burner pipe, to maintain the forced cooling effect regardless of the firing rate of said blowing media for combustion.
Claim 6
Dependent Claim
129 words
In a rotary kiln furnace employing at least one shell burner pipe projecting radially into the furnace interior through which blowing media is introduced for combustion, forced cooling apparatus comprising: a. cooling header ducting positioned within and along the length of said burner pipe adjacent to and at a selected distance from, those portions of the inner burner pipe walls subject to overheating; b. gaseous cooling media supply means, for supplying and maintaining gaseous cooling media under pressure within said cooling header ducting; c. an array of spaced cooling jet nozzle openings in the walls of said cooling header ducting for directing said gaseous cooling media in the form of an array of directly impinging multiple high velocity jets directly against the inner side walls of said burner pipe.
Claim 7
Dependent Claim
129 words
In a rotary kiln furnace employing at least one shell burner pipe projecting radially into the furnace interior through which blowing media is introduced for combustion, forced cooling apparatus comprising: a. cooling header ducting positioned within and along the length of said burner pipe adjacent to and at a selected distance from, those portions of the inner burner pipe walls subject to overheating; b. gaseous cooling media supply means, for supplying and maintaining gaseous cooling media under pressure within said cooling header ducting; c. an array of spaced cooling jet nozzle openings in the walls of said cooling header ducting for directing said gaseous cooling media in the form of an array of directly impinging multiple high velocity jets directly against the inner side walls of said burner pipe.
Claim 8
Dependent Claim
41 words
An apparatus according to claim 5 in which said cooling header ducting is fixed in relation to the shell burner only at the inlet end of said burner, allowing free differential thermal expansion of said ducting axially of said burner pipe.
Claim 9
Dependent Claim
45 words
The apparatus according to claim 5 in which the composite area of said jet nozzle openings is in the range of 1 to 5 per cent of the total area of the interior surface of said burner pipe covered by the array of cooling jets.
Claim 10
Dependent Claim
40 words
The apparatus according to claim 5 in which the distance between the jet nozzle openings and the interior walls of said burner pipe is in the range of four to 15 times the diameter of the individual jet nozzle openings.
Claim 11
Dependent Claim
54 words
The apparatus according to claim 5 in which said header ducting comprises a plurality of internal cooling header ducts positioned longitudinally in a concentric annular arrangement and substantially parallel to the inner burner pipe walls, each internal cooling header duct being equipped with a portion of said array of spaced cooling jet nozzle openings.
Claim 12
Dependent Claim
118 words
An apparatus according to claim 9 in which said internal cooling header ducts are joined together with at least one set of annular spacing rings within the burner pipe, and said ducts communicate with and join in a common external supply header pipe ring fixed rigidly at the burner inlet, which is supplied with pressurized cooling media via a separate cooling media supply duct, said internal cooling header ducts, annular spacing rings and header pipe ring comprising an integral assembly which is fastened in fixed relation to the burner at the burner inlet, and along the burner pipe interior length allows for free longitudinal movement as caused by differential thermal expansion between said integral assembly and burner pipe.
References Cited (Backward Citations)
US2063233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |