US3771473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuyere for a blast furnace and a method for operating the tuyere to atomize combustible material fed into the tuyere by a shock wave
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
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Filing: 1972-01-19
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Granted: 1973-11-13
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Expires: 1992-01-19
Abstract
Abstract A method and an arrangement for operating a supersonic tuyere having a convergent and a divergent passage portion separated by a neck in such a manner so as to produce in the divergent passage portion a shock wave to atomize a combustible material fed in the region of the neck into the tuyere. The shock wave is produced by more or less restricting the open cross section of the neck, preferably by adjusting the axial position of a solid body in the convergent portion of the tuyere with respect to the neck, to maintain the pressure of a combustion sustaining material fed into the tuyere upstream of the convergene portion, during variation of the fed amount of such material within predetermined limits, at such a magnitude to assure production of a shock wave at the divergent portion.
Inventors
- 👤 D Borgnat
- 👤 Casa H Della
- 👤 N Jusseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:01
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/34; C; C21; C21B; C21B7/00; C21B7/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
227 words
In a supersonic tuyere having a convergent passage portion and a divergent passage portion separated by a neck, a combination comprising means for feeding a combustion sustaining material at an amount, which may vary between predetermined limits, upstream of said convergent portion into said tuyere; means for feeding a combustible material in the region of said neck into the tuyere; a solid body coaxially arranged in the said convergent passage portion and axially movable with respect thereto; motor means connected to said body for adjusting the position thereof relative to said neck; means to detect the pressure in said tuyere upstream of said convergent portion; means to furniSh a reference pressure; means to compare said upstream pressure with said reference pressure and to produce a signal corresponding to the difference between said pressures; and means to transmit said signal to said motor means for adjusting the axial position of said body in order to displace the latter as a function of the magnitude of said signal in order to maintain the pressure in said tuyere upstream of the convergent portion during variations, within said predetermined limits, of the amount of combustion sustaining material fed into said tuyere, at such a pressure to produce a shock wave in said divergent portion so as to atomize the combustible material fed into the tuyere in the region of said neck.
Claim 2
Dependent Claim
227 words
In a supersonic tuyere having a convergent passage portion and a divergent passage portion separated by a neck, a combination comprising means for feeding a combustion sustaining material at an amount, which may vary between predetermined limits, upstream of said convergent portion into said tuyere; means for feeding a combustible material in the region of said neck into the tuyere; a solid body coaxially arranged in the said convergent passage portion and axially movable with respect thereto; motor means connected to said body for adjusting the position thereof relative to said neck; means to detect the pressure in said tuyere upstream of said convergent portion; means to furniSh a reference pressure; means to compare said upstream pressure with said reference pressure and to produce a signal corresponding to the difference between said pressures; and means to transmit said signal to said motor means for adjusting the axial position of said body in order to displace the latter as a function of the magnitude of said signal in order to maintain the pressure in said tuyere upstream of the convergent portion during variations, within said predetermined limits, of the amount of combustion sustaining material fed into said tuyere, at such a pressure to produce a shock wave in said divergent portion so as to atomize the combustible material fed into the tuyere in the region of said neck.
Claim 3
Dependent Claim
80 words
A combination as defined in claim 1, wherein said means to compare said upstream pressure with said reference pressure comprises an enclosure, a membrane extending transversely through said enclosure and dividing the latter into two separate compartments, and means for applying said upstream pressure to one face of said membrane and for applying said reference pressure to the other face of said membrane so as to deflect a portion of the latter in correspondence to the difference between said pressures.
Claim 4
Dependent Claim
34 words
A combination as defined in claim 1, wherein said body is of substantially conical configuration tapering towards said divergent portion and having an outer maximum diameter smaller than the inner diameter of said neck.
Claim 5
Dependent Claim
176 words
A combination as defined in claim 1, wherein said means to compare said upstream pressure with said reference pressure comprises an enclosure, a membrane extending transversely through said enclosure and dividing the same into two separate compartments, and means for applying said upstream pressure to said one face of said membrane and for applying said reference pressure to the other face of said membrane so as to deflect a portion of said membrane in correspondence with the difference of said pressures, and wherein said motor means to adjust the axial position of said body as a function of the deflection of said portion of said membrane comprises a cylinder and a piston reciprocatable in said cylinder and connected to said body for moving the same in axial direction, and means connected to said portion of said membrane for feeding pressure fluid into said cylinder to one or the other side of the piston therein to move the latter and the body connected thereto in axial direction and in correspondence with the deflection of said membrane portion.
Claim 6
Dependent Claim
14 words
A combination as defined in claim 1, and including means for cooling said body.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |