US3794308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for injecting hot gases into a shaft furnace
Assignee: Centre de Recherches Metallurgiques CRM ASBL
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Filing: 1972-11-30
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Granted: 1974-02-26
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Expires: 1992-11-30
Abstract
Abstract The device has a longitudinal unit comprising an outer metal tube and an inner refractory tube. A liquid-cooled nozzle at one end of the unit converges to a narrow outlet. A terminal element at the other end of the unit serves to connect the device to the outer furnace wall, to connect the bore of the longitudinal unit to a hot gas supply, and to connect the device to a cooling liquid supply.
Inventors
- 👤 N Ponghis
- 👤 C Vanosmael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:28
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B7/00; C21B7/16
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
167 words
A device for injecting hot gases into a shaft furnace, the device comprising: a. a longitudinal unit comprising two co-axial tubes, the outer tube being of a metallic substance having satisfactory mechanical strength and chemical resistance at high temperatures, and the inner tube being of non-metallic refractory substance and having a central bore of constant diameter and an internal surface of uniform smoothness; b. a terminal liquid-cooled nozzle extending in the longitudinal unit and constituting an outlet for the hot gases to be injected, the internal bore of the nozzle having a convergent portion followed by a parallel-sided neck. c. a terminal element on the end of the longitudinal unit opposite to the nozzle, the terminal element compriSing a collar adapted for fastening to the outer wall of a shaft furnace, and a connector adapted to connect the bore of the longitudinal unit to a hot gas supply and having an inlet and an outlet for circulation of cooling liquid, and d. a cooling liquid circulation unit.
Claim 2
Independent Claim
167 words
A device for injecting hot gases into a shaft furnace, the device comprising: a. a longitudinal unit comprising two co-axial tubes, the outer tube being of a metallic substance having satisfactory mechanical strength and chemical resistance at high temperatures, and the inner tube being of non-metallic refractory substance and having a central bore of constant diameter and an internal surface of uniform smoothness; b. a terminal liquid-cooled nozzle extending in the longitudinal unit and constituting an outlet for the hot gases to be injected, the internal bore of the nozzle having a convergent portion followed by a parallel-sided neck. c. a terminal element on the end of the longitudinal unit opposite to the nozzle, the terminal element compriSing a collar adapted for fastening to the outer wall of a shaft furnace, and a connector adapted to connect the bore of the longitudinal unit to a hot gas supply and having an inlet and an outlet for circulation of cooling liquid, and d. a cooling liquid circulation unit.
Claim 3
Dependent Claim
19 words
A device as claimed in claim 1, wherein the metallic substance of the outer tube is an alloy steel.
Claim 4
Dependent Claim
14 words
A device as claimed in claim 2, wherein the alloy steel is stainless steel.
Claim 5
Dependent Claim
27 words
A device as claimed in claim 1, wherein the non-metallic substance of the inner tube is a fine-graded castable refractory concrete possessing great strength at high temperature.
Claim 6
Dependent Claim
27 words
A device as claimed in claim 1, wherein the nozzle is made of the same metallic substance as that of the outer tube of the longitudinal unit.
Claim 7
Dependent Claim
20 words
A device as claimed in claim 1, wherein the nozzle is made of a metallic substance possessing high thermal conductivity.
Claim 8
Dependent Claim
14 words
A device as claimed in claim 6, wherein the nozzle is made of copper.
Claim 9
Dependent Claim
20 words
A device as claimed in claim 1, wherein the collar of the terminal element is made of a metallic substance.
Claim 10
Dependent Claim
27 words
A device as claimed in claim 8, wherein the collar is made of the same metallic substance as that of the outer tube of the longitudinal unit.
Claim 11
Dependent Claim
26 words
A device as claimed in claim 8, wherein the collar is secured to the outer tube by means of a frustoconical connecting piece made of metal.
Claim 12
Dependent Claim
21 words
A device as claimed in claim 1, wherein the connector of the terminal element is made of a non-metallic refractory substance.
Claim 13
Dependent Claim
28 words
A device as claimed in claim 11, wherein the connector is made of the same non-metallic refractory substance as that of the inner tube of the longitudinal unit.
Claim 14
Dependent Claim
21 words
A device as claimed in claim 11, wherein the connector forms an extension of the inner tube of the longitudinal unit.
Claim 15
Dependent Claim
19 words
A device as claimed in claim 13, wherein the connector is in a single piece with the inner tube.
Claim 16
Dependent Claim
20 words
A device as claimed in claim 1, wherein the connector of the terminal element is made of a metallic substance.
Claim 17
Dependent Claim
18 words
A device as claimed in claim 15, wherein the connector is in a single piece with the collar.
Claim 18
Dependent Claim
49 words
A device as claimed in claim 1, wherein the cooling liquid circulation circuit comprises a liquid inlet and a liquid outlet on the periphery of the terminal element, a circular part within the terminal element, a rectilinear part traversing the longitudinal unit, and a terminal part in the nozzle.
Claim 19
Dependent Claim
59 words
A device as claimed in claim 17, wherein the circular part of the cooling circuit comprises two separate annular chambers, one connected to the liquid inlet and the other connected to the liquid outlet, the first and second chambers being connected by the rectilinear part of the circuit traversing the longitudinal unit and the terminal circuit of the nozzle.
Claim 20
Dependent Claim
31 words
A device as claimed in claim 17, wherein the circular part of the cooling circuit is independent of the remaining parts, having a water inlet and outlet which are also separate.
Claim 21
Dependent Claim
42 words
A device as claimed in claim 1, wherein the cooling circuit traverses the longitudinal unit and comprises pipes partially housed within the thickness of the wall of the outer tube and partially within the thickness of the wall of the inner tube.
Claim 22
Dependent Claim
33 words
A device as claimed in claim 20, wherein there are four pipes equally spaced around the inner tube, one pair of diametrically opposed pipes being inlet pipes, the other pair being outlet pipes.
References Cited (Backward Citations)
US3342473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |