US3917243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supersonic shock wave tuyere
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
•
Filing: 1974-01-09
•
Granted: 1975-11-04
•
Expires: 1994-01-09
Abstract
Abstract A supersonic shockwave tuyere for injecting a mixture of fuel into a shaft furnace. The tuyere has a convergent and a divergent portion and a sonic throat at the junction of the two portions. The convergent portion, the sonic throat and the first part of the divergent portion are formed in a first member which is releasably connected to a second member which forms a second part of the divergent portion, whereby upon change in the rate of the supply medium for support of the combustion, the first part may be exchanged against another part to modify the sonic throat as a function of such change.
Inventors
- 👤 Daniel Borgnat
- 👤 Guy Forestier
- 👤 Georges Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:58
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/16; F; F23; F23D; F23D11/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A supersonic shock wave tuyere for injecting a mixture of fuel and a combustion-supporting medium into a shaft furnace, said tuyere having an unobstructed passage including a convergent portion and a divergent portion with a sonic throat at the junction of said portions, said tuyere comprising a first member forming said convergent portioN, said sonic throat and a first part of said divergent portion; a fixed, hollow internally cooled second member forming a second part of said divergent portion; and means for removably connecting said first member to said second member so that said first and second parts of said divergent portion are joined to form extensions of each other whereby upon change of the rate of the supply medium for support of combustion, said first member may be exchanged for a different first member having a different throat area and adapted to be placed against the original second member to modify the sonic throat as a function of said change.
Claim 2
Dependent Claim
161 words
A supersonic shock wave tuyere for injecting a mixture of fuel and a combustion-supporting medium into a shaft furnace, said tuyere having an unobstructed passage including a convergent portion and a divergent portion with a sonic throat at the junction of said portions, said tuyere comprising a first member forming said convergent portioN, said sonic throat and a first part of said divergent portion; a fixed, hollow internally cooled second member forming a second part of said divergent portion; and means for removably connecting said first member to said second member so that said first and second parts of said divergent portion are joined to form extensions of each other whereby upon change of the rate of the supply medium for support of combustion, said first member may be exchanged for a different first member having a different throat area and adapted to be placed against the original second member to modify the sonic throat as a function of said change.
Claim 3
Dependent Claim
37 words
A tuyere as defined in claim 1, and including means incorporated in said first member for injecting fuel into the tuyere, and means connected to said first member for passing a gaseous combustion-supporting medium into the tuyere.
Claim 4
Dependent Claim
24 words
A tuyere as defined in claim 2, wherein said combustion-supporting medium is taken from a supply circuit of hot blast to a blast furnace.
Claim 5
Dependent Claim
66 words
A tuyere as defined in claim 2, wherein said divergent and convergent portions are constituted by coaxial surfaces of revolution, wherein said first and said second part of said divergent portion have the same cone angle, and wherein said sonic throat is constituted by the intersection of said surfaces constituting said divergent and convergent portions in a plane normal to the common axis of said portions.
Claim 6
Dependent Claim
64 words
A tuyere as defined in claim 2, wherein said means for injecting fuel into said tuyere comprises an annular chamber formed in said first member, passage means for feeding fuel into said annular chamber, and a plurality of passages communicating at opposite ends with said annular chamber and with the interior of said first part of said divergent portion downstream of said sonic throat.
Claim 7
Dependent Claim
52 words
A tuyere as defined in claim 2, wherein said second member comprises a support plate provided with a central opening defined by a frustoconical surface and a hollow body coaxially joined to said support plate and defining a frustoconical passage of the same cone angle as said opening in said support plate.
Claim 8
Dependent Claim
60 words
A tuyere as defined in claim 6, wherein said hollow body is formed from a material having high thermal conductivity, and including a jacket arranged in said hollow body spaced from the inner surface thereof, and means for circulating a cooling fluid through said jacket and through the space between the latter and the inner surface of said hollow body.
Claim 9
Dependent Claim
53 words
A tuyere as defined in claim 6, wherein said support plate has an external frustoconical bearing surface, and including an annular support member adapted to be mounted in an opening of the shaft furnace, said support member having an internal frustoconical surface tightly engaged by said external frustoconical surface of said support plate.
Claim 10
Dependent Claim
20 words
A tuyere as defined in claim 6, wherein said connecting means removably connect said first member to said support plate.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |