US3829073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices blowing-in oxygen through the bottoms of metallurgical converters
Assignee: Centre de Recherches Metallurgiques CRM ASBL
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Filing: 1972-12-08
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Granted: 1974-08-13
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Expires: 1992-12-08
Abstract
Abstract An arrangement for preventing hydrocarbon from forming an accumulation in the region adjacent to the outlet end of the dual tube tuyere utilized for blowing-in oxygen and a liquid hydrocarbon through the bottom of a metallurgical converter.
Inventors
- 👤 C Courard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:33
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/48
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
179 words
A device for blowing-in through the bottom of a metallurgical converter, provided with a dual, coaxial tubes tuyere of which the inner tube serves for oxygen and the outer tube for a liquid protecting fluid, for instance a hydrocarbon, thus characterized that, it comprises a tubular enclosure (1) surrounding along its entire height that part (2) of the dual, coaxial tubes tuyere which is located in the refractory mass (3) forming the converter bottom, that said enclosure is constituted of an annular base (4) which is hollow and welded onto bottom plate (5) and of a casing (6) fastend on said annular base (4), that said casing (6) is filled with a refractory substance (7) which is well tamped, and that the wall of annular base (4) touching casing (6) and the wall of bottom plate (5) touching annular base (4) are provided with at least one orifice of communication each, resp. (8) and (9), so as to allow subjecting said enclosure (1) to a pressure meant to prevent downward hydrocarbon flow through refractory substance (7) of casing (6).
Claim 2
Independent Claim
179 words
A device for blowing-in through the bottom of a metallurgical converter, provided with a dual, coaxial tubes tuyere of which the inner tube serves for oxygen and the outer tube for a liquid protecting fluid, for instance a hydrocarbon, thus characterized that, it comprises a tubular enclosure (1) surrounding along its entire height that part (2) of the dual, coaxial tubes tuyere which is located in the refractory mass (3) forming the converter bottom, that said enclosure is constituted of an annular base (4) which is hollow and welded onto bottom plate (5) and of a casing (6) fastend on said annular base (4), that said casing (6) is filled with a refractory substance (7) which is well tamped, and that the wall of annular base (4) touching casing (6) and the wall of bottom plate (5) touching annular base (4) are provided with at least one orifice of communication each, resp. (8) and (9), so as to allow subjecting said enclosure (1) to a pressure meant to prevent downward hydrocarbon flow through refractory substance (7) of casing (6).
Claim 3
Dependent Claim
26 words
A device according to claim 1, thus characterized that the axis of the tubular enclosure (1) coincides with the axis of the dual, coaxial tubes tuyere.
Claim 4
Dependent Claim
20 words
A device according to claim 1, thus characterized that the outer casing wall is constituted by a thin metal sheet.
Claim 5
Dependent Claim
15 words
A device according to claim 3, thus characterized that the metal sheet is of steel.
Claim 6
Dependent Claim
22 words
A device according to claim 3, thus characterized that the thickness of the metal sheet is of the order of 1 mm.
Claim 7
Dependent Claim
34 words
A device according to claim 1, thus characterized that the refractory substance filling the space between the outer casing wall and the dual tuyere''s outer wall is the same as constituting the converter bottom.
Claim 8
Dependent Claim
31 words
A device according to claim 1, thus characterized that the clearance between the two coaxial tubes is equal to that permitting slight-friction insertion of the inner tube into the outer tube.
Claim 9
Dependent Claim
27 words
A device according to claim 1 wherein at least one tube surface in the space between the inner tube and the outer tube is provided with grooves.
Claim 10
Dependent Claim
42 words
A device according to claim 7, thus characterized that the outer wall of the inner tube comprises several uniformly distributed zones along which takes place the slight friction with respect to the outer tube, these zones being separated by flattened rectilinear areas.
Claim 11
Dependent Claim
101 words
A device according to claim 1, thus characterized that it further comprises: a. A tuyere-support (10) fastened to the lower side (11) of bottom plate (5) of the converter at the proper tuyere emplacement, b. an annular flange (12) fastened to the outer joint (13) from the tuyere to the injection fluids supply channels, c. at least four pressure-screws (14) passing through threaded supports (15) in the annular flange (12) and coming to a stop against the tuyere-support (10) so that said tuyere is subjected to a force from those screws which is meant to remove the two coaxial tubes together.
Claim 12
Dependent Claim
54 words
A device according to claim 10, thus characterized that it comprises a refractory substance channel (16) resting on the bottom plate (5) and the axis of which coincides with that of the injection tuyere, the channel inner diameter being such as to permit high-friction insertion of the outer tube into said tuyere''s inner part.
References Cited (Backward Citations)
US3602435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |