US3630508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical shaft furnace system
Assignee: ANDCO INCORPORATED A CORP OF NY
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Filing: 1969-09-05
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Granted: 1971-12-28
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Expires: 1989-09-05
Abstract
Abstract A vertical shaft furnace in which the burden or charge is supported at the base of the furnace with an open annular space surrounding the charged material within the hearth, one or more angularly or tangentially disposed downwardly inclined tuyeres for introducing preheated air, with or without added fuel, into the annular space, a bypass line which connects with the base to vent the open annular space and thereby control the degree of heating and location of heating of the burden or charge according to its location within the vertical furnace, the bypass line including valve means for controlling the outlet flow through the bypass line in accordance with the prevailing conditions of the operations, an intermediate takeoff in the vertical shaft furnace for removing volatiles and gaseous byproducts at subatmospheric pressures for subsequent processing or treatment, and valved means for introducing fluxes or other additives into the annular space at the hearth on a controlled or metered continuous basis.
Inventors
- 👤 Kenneth W Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:41
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/10; F27B1/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
A metallurgical furnace having a base, a vertical shaft portion and at the base thereof a large cross section hearth which defines an open, annular space completely surrounding the charged stock within the hearth, a plurality of tuyeres, one disposed at each of a plurality of circumferentially spaced intervals disposed at the base of said furnace and inclined downwardly and directed angularly so that the respective outflows are complementary in effecting both agitation and swirling action within the annular space surrounding the charged stock, bypass means for controllably throttling an outflow of gaseous combustion product from within said annular open space to regulate the distribution of heat between said space and the overhead burden within said furnace, means for directing a combustible flow into said open annular space through said tuyeres, and means for adding materials to the annular open space surrounding the charged stock to be dispersed by the blast from the tuyeres.
Claim 2
Dependent Claim
154 words
A metallurgical furnace having a base, a vertical shaft portion and at the base thereof a large cross section hearth which defines an open, annular space completely surrounding the charged stock within the hearth, a plurality of tuyeres, one disposed at each of a plurality of circumferentially spaced intervals disposed at the base of said furnace and inclined downwardly and directed angularly so that the respective outflows are complementary in effecting both agitation and swirling action within the annular space surrounding the charged stock, bypass means for controllably throttling an outflow of gaseous combustion product from within said annular open space to regulate the distribution of heat between said space and the overhead burden within said furnace, means for directing a combustible flow into said open annular space through said tuyeres, and means for adding materials to the annular open space surrounding the charged stock to be dispersed by the blast from the tuyeres.
Claim 3
Dependent Claim
57 words
The furnace in accordance with claim 1 wherein the means for adding materials to said annular open space comprises an opening in said hearth wall positioned above the horizontal line of the tuyeres, a conduit connecting said opening to a closed chamber, and valve means for controlling the rate of flow from said chamber to said opening.
Claim 4
Dependent Claim
19 words
The furnace in accordance with claim 2 wherein the chamber for feeding material to the furnace hearth is pressurized.
Claim 5
Dependent Claim
31 words
The furnace in accordance with claim 1 including means intermediate of the top and bottom ends of the vertical shaft portion for withdrawing the hot gases of combustion and generated volatiles.
Claim 6
Dependent Claim
23 words
The furnace in accordance with claim 4 in which the withdrawal means on the vertical shaft comprises a collection ring surrounding said shaft.
Claim 7
Dependent Claim
20 words
The furnace in accordance with claim 5 including means for maintaining a negative or subatmospheric pressure at said collection ring.
Claim 8
Dependent Claim
32 words
The furnace in accordance with claim 5 including control means operable to maintain a subatmospheric pressure sufficient to cause a substantial portion of the outflow gases to flow through said collection ring.
Claim 9
Dependent Claim
207 words
A metallurgical furnace having a base, a vertical shaft portion and at the base thereof a large cross section hearth which defines an open, annular space completely surrounding the charged stock within the hearth, a plurality of tuyeres, one disposed at each of a plurality of circumferentially spaced intervals disposed at the base of said furnace and inclined downwardly and directed angularly so that the respective outflows are complementary in effecting both agitation and swirling action within the annular space surrounding the charged stock, bypass means for controllably throttling an outflow of gaseous combustion product from within said annular open space to regulate the distribution of heat between said space and the overhead burden within said furnace, means for directing a combustible flow into said opEn annular space through said tuyeres, an opening in said hearth wall positioned above the horizontal line of the tuyeres, a conduit connecting said opening to a closed chamber, and valve means for controlling the rate of flow from said chamber to said opening, a collection ring intermediate of the top and bottom ends of the vertical shaft portion for withdrawing the hot gases of combustion and generating volatiles, and means for maintaining a negative or subatmospheric pressure at said collection ring.
Claim 10
Dependent Claim
207 words
A metallurgical furnace having a base, a vertical shaft portion and at the base thereof a large cross section hearth which defines an open, annular space completely surrounding the charged stock within the hearth, a plurality of tuyeres, one disposed at each of a plurality of circumferentially spaced intervals disposed at the base of said furnace and inclined downwardly and directed angularly so that the respective outflows are complementary in effecting both agitation and swirling action within the annular space surrounding the charged stock, bypass means for controllably throttling an outflow of gaseous combustion product from within said annular open space to regulate the distribution of heat between said space and the overhead burden within said furnace, means for directing a combustible flow into said opEn annular space through said tuyeres, an opening in said hearth wall positioned above the horizontal line of the tuyeres, a conduit connecting said opening to a closed chamber, and valve means for controlling the rate of flow from said chamber to said opening, a collection ring intermediate of the top and bottom ends of the vertical shaft portion for withdrawing the hot gases of combustion and generating volatiles, and means for maintaining a negative or subatmospheric pressure at said collection ring.
Claim 11
Dependent Claim
19 words
The furnace in accordance with claim 8 wherein the chamber for feeding material to the furnace hearth is pressurized.
Claim 12
Dependent Claim
32 words
The furnace in accordance with claim 9 including control means operable to maintain a subatmospheric pressure sufficient to cause a substantial portion of the outflow gases to flow through said collection ring.
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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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |