US3596894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of blowing furnances and system for the carrying out of the method
Assignee: LA SOC DE WENDEL
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Filing: 1968-12-11
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Granted: 1971-08-03
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Expires: 1988-12-11
Abstract
Abstract A method has been provided for the operation of a blast furnace wherein air is introduced in the blast furnace through a tuyere zone and an air flow maintained at high velocity. This method comprises of introducing the supplemental fuel into said tuyere zone and admixing the same with the air flowing through the tuyere zone; maintaining at least one lower velocity turbulent zone in said tuyere zone, said lower velocity being in respect to the velocity of the flowing air and supplemental fuel admixture, said lower velocity turbulent zone initiating and sustaining the combustion of said fuel; and controlling the amount of supplemental fuel consumed in the tuyere by varying the distance of the turbulent zone in respect to the zone at which the air flow exists from said tuyere. Apparatus illustrating various flow retarding devices and thus flame source and fuel combustion control means also have been disclosed.
Inventors
- 👤 Louis Duthion
- 👤 Arsene Marzouvanlian
- 👤 Robert Augustin Chaube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:06
CPC Classifications
B; B41; B41J; B41J23/00; B41J23/02; B41J23/04; B41J23/08; C; C21; C21B; C21B5/00; C21B5/001; C21B5/003; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/143
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A tuyere for a blast furnace having means for introduction of supplemental fuel and a convergent-divergent section formed by the walls thereof comprising in combination in a section thereof, downstream of the means for introduction of supplemental fuel and upstream from the downstream, furnace exit end of the tuyere, a turbulence introducing obstruction or constriction means, a section of said means defining an initial flame point for the supplemental fuel, the initial flame point defining section of said constriction means, in reference to the furnace exit of tuyere being located at a distance based on amount of supplemental fuel burned in the tuyere.
Claim 2
Dependent Claim
103 words
A tuyere for a blast furnace having means for introduction of supplemental fuel and a convergent-divergent section formed by the walls thereof comprising in combination in a section thereof, downstream of the means for introduction of supplemental fuel and upstream from the downstream, furnace exit end of the tuyere, a turbulence introducing obstruction or constriction means, a section of said means defining an initial flame point for the supplemental fuel, the initial flame point defining section of said constriction means, in reference to the furnace exit of tuyere being located at a distance based on amount of supplemental fuel burned in the tuyere.
Claim 3
Dependent Claim
18 words
The tuyere according to claim 1 wherein the obstruction or constriction means is an axial flow constriction means.
Claim 4
Dependent Claim
36 words
The tuyere according to claim 2 wherein the axial flow constriction means consist of a number of individual constrictions of axial and concentric solid, conical annuli attached to the walls of the tuyere by holding means.
Claim 5
Dependent Claim
27 words
The tuyere according to claim 2 wherein the axial flow constriction means consist of solid cones supported by holding means attached to the walls of the tuyere.
Claim 6
Dependent Claim
13 words
THe tuyere according to claim 1 wherein the constriction means is internally cooled.
Claim 7
Dependent Claim
38 words
The tuyere according to claim 1 and wherein a complementary, circumferentially , and longitudinally extending wall suspended from the tuyere''s wall is within the tuyere at a distance providing air flow between the same and the tuyeres wall.
Claim 8
Dependent Claim
25 words
The tuyere according to claim 1 and wherein the constriction is defined by supplemental fuel introduced into the tuyere through circumferentially spaced apart orifice means.
Claim 9
Dependent Claim
29 words
The tuyere according to claim 1 wherein the constriction means is a constriction means having a divergent-convergent section protruding axially and upstream from the flame point defining constriction means.
Claim 10
Dependent Claim
22 words
The tuyere according to claim 1 wherein a convergent-divergent section is formed therein from the walls thereof upstream from the constriction means.
Claim 11
Dependent Claim
68 words
The tuyere according to claim 1 wherein the position of obstruction means in the tuyere are defined by the relationship 0 1 L - lambda in which 1is the distance from the downstream end of the obstruction to the downstream exit of the tuyere; L is the distance from a discharge orifice of the supplemental fuel to the dowNstream exit of the tuyere; lambda is the spray distance.
Claim 12
Dependent Claim
112 words
The tuyere according to claim 1 wherein the positions of the obstruction means in the tuyere are defined by the relationship 0 1 (R-r) Ve/Vn 1-(Vn/Ve)2 in which: 1 is the distance from the downstream end of the obstruction to the downstream exit end of the tuyere; L is the distance from the discharge orifice of the addition fuel to the downstream exit end of the tuyere; lambda is the spray distance; Ve is the axial velocity of flow of the blast gases; Vn is the normal combustion velocity at the flame front; R is half the hydraulic diameter of the tuyere; r is half the outer hydraulic diameter of the obstruction.
References Cited (Backward Citations)
US982244A
Cited
US1870511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |