US3841614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for preheating steel ingot or blooms by the use of high-speed jet streams as well as heating furnace using the same
Assignee: Kawasaki Heavy Industries Ltd
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Filing: 1972-12-06
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Granted: 1974-10-15
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Expires: 1992-12-06
Abstract
Abstract Apparatus for preheating substances such as steel ingots, slabs, blooms, billets or the like to be treated in a reheating furnace by the use of high-speed jet streams is provided with a casing which consists of two parts, one of them being a high-speed jet zone of a hot fluid having a high temperature which has been exhausted from the said reheating furnace and the other a convection zone (or a high-speed jet zone) connected with the said jet zone. A conveyor operates to successively feed the said substances to be treated such as steel ingots or blooms into the said casing and to successively extract the thus treated substances from the said casing. The present invention also relates to a reheating furnace for industrial use which is provided within a part of its combustion zone with a numer of jet nozzles being equipped to the upper and lower portions of the said combustion zone (high-speed jet zone) each at a determined distance from substances to be treated, wherein a high temperature exhaust gas which has been fed from another combustion zone is jetted from the said nozzles under high speed into the said high-speed jet zone whereby a heat transfer is efficiently conducted therein between the said gas streams and the said substances by utilizing the high coefficient of heat transfer occurred on the surface of the said substances due to the said high-speed gas streams.
Inventors
- 👤 R Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
F; F27; F27D; F27D7/00; B; B21; B21B; B21B45/00; B21B45/004; B21B45/02; B21B45/0203; B21B45/0209; B21B45/0215; B21B45/023; F27B; F27B9/00; F27B9/06; F27B9/10; F27B9/14; F27B9/20; F27B9/22; F27B9/30; F27B9/38; F27B9/12; F27B2009/122; F27B2009/124; F27B2009/126; F27B9/36; F27B2009/3638; F27D3/00; F27D2003/0034; F27D2003/0046; F27D2003/0051; F27D2003/008; F27D9/00; F27D2009/007; F27D2009/0089; F27M; F27M2001/00; F27M2001/15; F27M2001/1539; F27M2001/1547; F27M2001/1552
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
A preheating apparatus for treating substances such as steel ingots, blooms, slabs, billets or the like to be treated in a reheating furnace, the improvement comprising: a casing defining a chamber having at a first end means forming a high-speed jet zone of a hot fluid having a high temperature which has been exhausted from said reheating furnace and at a second end a convection zone connected with the said jet zone; means for directing said exhaust gases from said reheating furnace to said jet nozzles; and a conveyor which operates to successively feed the said substances into the said casing and to successively extract the thus treated substances from the casing, wherein; heat transfer is conducted on the surface of the said substances by a high coefficient of heat transfer occurring on the said surface by the impingement of the said hot jet streams.
Claim 2
Dependent Claim
145 words
A preheating apparatus for treating substances such as steel ingots, blooms, slabs, billets or the like to be treated in a reheating furnace, the improvement comprising: a casing defining a chamber having at a first end means forming a high-speed jet zone of a hot fluid having a high temperature which has been exhausted from said reheating furnace and at a second end a convection zone connected with the said jet zone; means for directing said exhaust gases from said reheating furnace to said jet nozzles; and a conveyor which operates to successively feed the said substances into the said casing and to successively extract the thus treated substances from the casing, wherein; heat transfer is conducted on the surface of the said substances by a high coefficient of heat transfer occurring on the said surface by the impingement of the said hot jet streams.
Claim 3
Dependent Claim
60 words
The preheating apparatus of claim 1 wherein said high speed jet zone at said first end comprises a plurality of jet nozzles located on each side of said substances to be treated to direct the high temperature exhaust fluid toward the surface of said substance and means for directing said exhaust gases from said reheating furnace to said jet nozzles.
Claim 4
Dependent Claim
57 words
The preheating apparatus of claim 1 wherein said casing forms a first chamber containing the high-speed jet zone and a separate second chamber containing the convection zone, said first and second chambers being interconnected via a duct having pumping means connected thereto to pump said high temperature exhaust fluid from said first chamber to said second chamber.
Claim 5
Dependent Claim
34 words
The preheating apparatus of claim 3 wherein said first and second chambers contain a plurality of jet nozzles to direct the high temperature exhaust fluids at both sides of said substances to be treated.
Claim 6
Dependent Claim
125 words
In an industrial furnace having a plurality of independent, fire proof combustion chambers and conveying means inside of said combustion chambers for transporting materials to be reheated, the improvements comprising: a. a preheating chamber adjacent the first combustion chamber through which the material to be reheated passes, b. a plurality of jet nozzles in said preheating chamber to direct high temperature exhaust gas from the industrial furnace onto both sides of the material to be reheated so as to raise the temperature of the material to approximately 500*C, c. means to prevent said high temperature exhaust gas from entering said combustion chamber after passing through said nozzles, and d. means to direct the high temperature exhaust gas from the industrial furnace to said jet nozzles.
Claim 7
Dependent Claim
125 words
In an industrial furnace having a plurality of independent, fire proof combustion chambers and conveying means inside of said combustion chambers for transporting materials to be reheated, the improvements comprising: a. a preheating chamber adjacent the first combustion chamber through which the material to be reheated passes, b. a plurality of jet nozzles in said preheating chamber to direct high temperature exhaust gas from the industrial furnace onto both sides of the material to be reheated so as to raise the temperature of the material to approximately 500*C, c. means to prevent said high temperature exhaust gas from entering said combustion chamber after passing through said nozzles, and d. means to direct the high temperature exhaust gas from the industrial furnace to said jet nozzles.
Claim 8
Dependent Claim
16 words
The improved industrial furnace of claim 5 wherein said nozzles are composed of fire proof brick.
Claim 9
Dependent Claim
35 words
The improved industrial furnace of claim 5 wherein said means to prevent the high temperature exhaust gases from entering the combustion chamber comprises a high-speed gas curtain between said preheating chamber and said combustion chamber.
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |