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US3672649A
Expired / Lapsed
US
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Shaft or stack furnace and method and apparatus for lining same
Assignee: J E Allen & Associates Inc
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Filing: 1970-09-11
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Granted: 1972-06-27
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Expires: 1990-09-11
Abstract
Abstract A stack portion of a furnace having an outer shell is lined with refractory concrete by casting or gunniting the concrete between the stack outer shell and a heat consumable inner form to build up the lining in horizontal layers of stacked integral rings in the absence of appreciable voids or vertical faults. The resulting lining is a monolithic refractory concrete wall capable of withstanding very high temperatures such as in blast furnace use. A suspended and vertically movable platform is provided for supporting ring-shaped form sections spaced inwardly from the furnace shell while the concrete is poured or gunnited from the platform at each pouring level. Laterally or horizontally extensible support members on the platform are used to bridge across the stack interior to provide interior support for the form during pouring.
Inventors
- 👤 John E Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:29
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/04; C21B7/06
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
264 words
A method of lining a vertically extending portion of the stack of a furnace such as a shaft furnace having an outer structural shell, which method comprises constructing within said stack a concrete pouring form spaced inwardly and generally parallel with said shell, bracing said form across the interior of said stack at a plurality of vertically spaced positions between the top and bottom of the stack, and pouring at each of said plurality of positions a complete vertical extent of the liner within said stack portion extending circumferentially of the form filling all voids between the form and shell to provide a monolithic refractory concrete body throughout said portion Of the stack and in the absence of appreciable vertical faults, said constructing, bracing and pouring steps each comprising a plurality of sequential operations involving constructing a first vertical extent of the form at the bottom of the stack portion, bracing the first vertical extent of the form, constructing a second vertical extent of the form contiguous with said first vertical extent at the top thereof, bracing the second vertical extent and pouring over the lip of the second vertical extent and repeating the constructing, bracing and pouring steps to form sequential contiguous vertical extents of the firm upwardly alternating with the forming of horizontal layers of the line between these extents and the shell during separate pouring steps until the concrete lining is formed as a contiguous incremental vertical lining throughout said vertically extending portion of the stack, and each pouring step comprises delivering the concrete under pressure to form each horizontal layer.
Claim 2
Independent Claim
264 words
A method of lining a vertically extending portion of the stack of a furnace such as a shaft furnace having an outer structural shell, which method comprises constructing within said stack a concrete pouring form spaced inwardly and generally parallel with said shell, bracing said form across the interior of said stack at a plurality of vertically spaced positions between the top and bottom of the stack, and pouring at each of said plurality of positions a complete vertical extent of the liner within said stack portion extending circumferentially of the form filling all voids between the form and shell to provide a monolithic refractory concrete body throughout said portion Of the stack and in the absence of appreciable vertical faults, said constructing, bracing and pouring steps each comprising a plurality of sequential operations involving constructing a first vertical extent of the form at the bottom of the stack portion, bracing the first vertical extent of the form, constructing a second vertical extent of the form contiguous with said first vertical extent at the top thereof, bracing the second vertical extent and pouring over the lip of the second vertical extent and repeating the constructing, bracing and pouring steps to form sequential contiguous vertical extents of the firm upwardly alternating with the forming of horizontal layers of the line between these extents and the shell during separate pouring steps until the concrete lining is formed as a contiguous incremental vertical lining throughout said vertically extending portion of the stack, and each pouring step comprises delivering the concrete under pressure to form each horizontal layer.
Claim 3
Dependent Claim
78 words
The method of claim 1 wherein the bracing steps comprise providing a vertically movable support platform suspended from the top of the stack within the stack bracing each vertical extent of the form outwardly from said platform while pouring the concrete over the lip of the form portion from the platform and thereafter moving the platform upwardly and bracing each additional vertical extent of the form while pouring over the lip of each vertical extent from the platform.
Claim 4
Dependent Claim
21 words
The method of claim 2 including the step of removing old refractory lining within the stack prior to the constructing step.
Claim 5
Dependent Claim
30 words
The method of claim 2 wherein said bracing step comprises extending a plurality of bracing means at positions spaced around said platform and in a direction peripherally of said platform.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein said stack portion is generally cylindrical and where each pouring step provides a horizontal ring of refractory concrete thereby producing a lining of vertically stacked horizontal rings.
Claim 7
Dependent Claim
21 words
The method of claim 5 wherein said form comprises a series of stacked cylindrical sections, one for each of said rings.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the processing step is by gunniting.
Claim 9
Dependent Claim
35 words
The method of claim 1 wherein said form is of a material consumable by burning and including the step after setting of the concrete of burning out the form to expose the refractory concrete lining.
Claim 10
Dependent Claim
174 words
A shaft furnace having a stack with an open center including a hearth area, a bosh area and a portion extending upwardly therefrom to a dome section, comprising: a foundation, an erect outer structural shell, a base of refractory material covering the foundation beneath the hearth area, a refractory lining for said shell defining the stack lining from the foundation to the dome section including a monolithic refractory concrete body circumscribing at least a portion of the open stack center and defining a vertical extent of the stack lining in the absence of appreciable vertical faults in said body, an inner skin layer defining a pouring form for the concrete, a support platform supported from the top of the shaft and provided with means for holding the inner skin against movement inwardly within the stack during pouring and setting of the concrete, and means for moving the platform through a plurality of vertically spaced positions with the stack, said skin holding means comprising a plurality of radially adjustable means extending peripherally from the platform.
Claim 11
Dependent Claim
174 words
A shaft furnace having a stack with an open center including a hearth area, a bosh area and a portion extending upwardly therefrom to a dome section, comprising: a foundation, an erect outer structural shell, a base of refractory material covering the foundation beneath the hearth area, a refractory lining for said shell defining the stack lining from the foundation to the dome section including a monolithic refractory concrete body circumscribing at least a portion of the open stack center and defining a vertical extent of the stack lining in the absence of appreciable vertical faults in said body, an inner skin layer defining a pouring form for the concrete, a support platform supported from the top of the shaft and provided with means for holding the inner skin against movement inwardly within the stack during pouring and setting of the concrete, and means for moving the platform through a plurality of vertically spaced positions with the stack, said skin holding means comprising a plurality of radially adjustable means extending peripherally from the platform.
Claim 12
Dependent Claim
23 words
The shaft furnace of claim 9 wherein said concrete is pressure poured and fills all voids between the shell and inner skin form.
Claim 13
Dependent Claim
27 words
The shaft furnace of claim 9 wherein said skin is non-structural and is supported by braces internally of the stack during pouring and setting of the concrete.
Claim 14
Dependent Claim
21 words
The shaft furnace of claim 11 wherein said inner skin is consumable by burning at the use temperature of the furnace.
Claim 15
Dependent Claim
97 words
The shaft furnace of claim 9 wherein said skin defines a tube of varying diameter alOng the length of said concrete body, said skin holding means comprises a plurality of radially movable adjustable members mounted on the platform for supporting the skin at the various skin tube diameters, and said moving means comprises hoist driven cables, and including a top platform mounted on the outer shell wall exteriorly of the stack, a supply of mixed refractory concrete on said top of platform and means for delivering the mixed concrete from said top platform to said support platform.
Claim 16
Dependent Claim
17 words
The shaft furnace of claim 9 wherein said refractory concrete body is in the absence of voids.
Claim 17
Dependent Claim
14 words
The shaft furnace of claim 9 including cooling plates extending into the concrete body.
Claim 18
Dependent Claim
19 words
The shaft furnace of claim 9 wherein said refractory concrete body comprises a plurality of stacked horizontal ring pours.
Claim 19
Independent Claim
109 words
A device for use in supporting personnel and equipment in a stack during the construction or replacement of a lining with poured refractory concrete in a stack furnace such as a blast furnace or an air heater for a blast furnace having an outer shell to be lined with poured concrete, said device comprising a support platform, means for supporting, lowering and raising the support platform within the stack from the top thereof, and adjustable means extending peripherally from the platform for holding and bracing concrete pouring forms from inward movement at positions spaced inwardly from the furnace shell during pouring of concrete between the forms and the shell.
Claim 20
Independent Claim
109 words
A device for use in supporting personnel and equipment in a stack during the construction or replacement of a lining with poured refractory concrete in a stack furnace such as a blast furnace or an air heater for a blast furnace having an outer shell to be lined with poured concrete, said device comprising a support platform, means for supporting, lowering and raising the support platform within the stack from the top thereof, and adjustable means extending peripherally from the platform for holding and bracing concrete pouring forms from inward movement at positions spaced inwardly from the furnace shell during pouring of concrete between the forms and the shell.
Claim 21
Dependent Claim
18 words
The device of claim 17 wherein said adjustable means includes removable floor means for extending the platform area.
Claim 22
Dependent Claim
67 words
The device of claim 17 for lining a stack furnace with a lining having a varying cross-section throughout its vertical extent, wherein the support platform is of an appropriate size for bypassing the most restricted area of the pouring forms and wherein said adjustable means comprises means extensible from the support platform periphery to various positions for supporting the forms at each vertical position of different cross-section.
Claim 23
Dependent Claim
16 words
The device of claim 17 wherein said adjustable means comprises a plurality of radially movable members.
Claim 24
Dependent Claim
16 words
The device of claim 17 wherein said supporting, lowering and raising means comprises hoist driven cables.
Claim 25
Dependent Claim
41 words
The device of claim 17 including a top platform secured to the outer shell wall, means defining a supply of mixed refractory concrete on said top platform and means for delivering said mixed concrete from the platform to the support platform.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |