Patent JPS53137101A successfully refreshed from Google Patents.
US3793002A
Expired / Lapsed
US
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Method of introducing a combustible auxiliary liquid into blast furnace and a tuyere for carrying out the method
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
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Filing: 1971-10-12
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Granted: 1974-02-19
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Expires: 1991-10-12
Abstract
Abstract A method and tuyere for introducing a combustible auxiliary liquid into a blast furnace to partially replace coke used as reduction agent, in which the hot blast necessary for the operation of the blast furnace is fed into a tuyere passage having a convergent inlet portion and a divergent output portion at such pressure so that the hot blast reaches supersonic speed in the passage and forms a shock wave in the divergent outlet portion. The combustible liquid is introduced into the passage upstream of the shock wave forming therein so that the latter will atomize and thoroughly mix the combustible liquid with the hot air to thus cause complete combustion of the mixture.
Inventors
- 👤 D Borgnat
- 👤 H Casa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:22
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
A method as defined in claim 1 wherein said combustible liquid is introduced into the tuyere upstream of the shock wave forming therein.
Claim 2
Dependent Claim
14 words
A method as defined in claim 1, wherein said combustible liquid is fuel oil.
Claim 3
Dependent Claim
61 words
A tuyere as defined in claim 3, wherein said passage is formed in a metal body of generally cylindrical configuration, and wherein said means for introducing the combustible liquid into said passage comprises an annular chamber surrounding said passage and opening into the latter in the region of said sonic neck and conduit means for feeding the liquid into said chamber.
Claim 4
Dependent Claim
40 words
A tuyere as defined in claim 4, and including a cooling jacket surrounding said body at least in the region of said outlet portion of said passage, and means for feeding a cooling fluid into and out of said jacket.
Claim 5
Dependent Claim
20 words
A method as defined in claim 1, wherein said combustible liquid is introduced into said divergent portion of the tuyeres.
Claim 6
Dependent Claim
153 words
A tuyere for introducing a blast into a blast furnace comprising a passage for the blast having a convergent inlet portion, a sonic neck, and a divergent outlet portion axially aligned with each other along a common axis; means for feeding a blast in axial direction only and at such a pressure into said inlet portion of said passage that the blast will move only in axial direction in a region of said divergent outlet portion, spaced from said sonic neck, at supersonic speed and form a shock wave in said region of said divergent outlet portion; and means for feeding a combustible liquid into said divergent outlet portion upstream of said region wherein the shock wave is formed so as to atomize the combustable liquid by said shock wave and to intimately mix it with said blast, thereby causing fast and complete combustion of the mixture without appreciable formation of carbon black.
Claim 7
Dependent Claim
35 words
A tuyere as defined in claim 13, wherein said tuyere is a Laval-type tuyere having a convergent inlet portion and a divergent outlet portion of substantially the same angle of divergence than said inlet portion.
Claim 8
Dependent Claim
167 words
In a blast furnace, a combination comprising a plurality of tuyeres for introducing a blast into the blast furnace, each of said tuyeres comprising a passage for the blast having a convergent inlet portion, a sonic neck, and a divergent outlet portion axially aligned with each other along a common axis; means for feeding a blast in axial direction only and at such a pressure into said inlet portion of said passage that the blast will move only in axial direction and reach in a region of said divergent outlet portion, spaced from said sonic neck, supersonic speed and form a shock wave in said region of said divergent outlet portion; and means for feeding a combustible liquid into said divergent outlet portion upstream of said region wherein the shock wave is formed so as to atomize the combustible liquid by said shock wave and to intimately mix it with the blast, thereby causing fast and complete combustion of the mixture without appreciable formation of carbon black.
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |