US4437186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste gas apparatus for electric furnace
Assignee: Nikku Industry Co Ltd
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Filing: 1982-03-29
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Granted: 1984-03-13
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Expires: 2002-03-29
Abstract
Abstract A primary duct is provided for supplying hot waste gas from an electric furnace to a preheater bucket charged with scrap. A preheating waste gas duct connected to the bucket is branched into a discharge duct for releasing preheating waste gas from the apparatus and a recycling duct for recycling preheating waste gas to the primary duct. In the vicinity of the junction of the primary duct and the recycling duct, an air inlet is formed for supplying air into the primary duct for burning the preheating waste gas.
Inventors
- 👤 Kunihiro Inai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:56
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/562; C21C5/565; F; F27; F27D; F27D13/00; F27D13/002; F27D17/00; F27D17/30; F27D17/304; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A waste gas recycling apparatus for an electric furnace comprising: a heat storage chamber; a preheater bucket charged with scrap; a first duct positioned between said electric furnace and said heat storage chamber; a second duct connected from said heat storage chamber to said preheater bucket; a recycling duct connected between said preheater bucket and said first duct; and an air inlet located at the juncture of said recycling duct and said first duct and so arranged that hot waste gas from said furnace and recycled gas from said preheater bucket are mixed with air and fed through said first duct to said heat storage chamber.
Claim 2
Dependent Claim
106 words
A waste gas recycling apparatus for an electric furnace comprising: a heat storage chamber; a preheater bucket charged with scrap; a first duct positioned between said electric furnace and said heat storage chamber; a second duct connected from said heat storage chamber to said preheater bucket; a recycling duct connected between said preheater bucket and said first duct; and an air inlet located at the juncture of said recycling duct and said first duct and so arranged that hot waste gas from said furnace and recycled gas from said preheater bucket are mixed with air and fed through said first duct to said heat storage chamber.
Claim 3
Dependent Claim
70 words
A waste gas recycling apparatus as claimed in claim 1, wherein said first duct comprises an elbow connected to said electric furnace and a water-cooled duct connected to said heat storage chamber, a clearance being provided between said elbow and said water-cooled duct and serving as said air inlet, and further comprising a hood arranged about said first duct at said clearance, said recycling duct being connected to said hood.
Claim 4
Dependent Claim
31 words
A waste gas recycling apparatus as claimed in claim 2, further comprising a slide duct positioned about said water-cooled duct within said hood for adjusting the opening of said air inlet.
Claim 5
Dependent Claim
40 words
A waste gas recycling apparatus as claimed in claim 2, wherein said elbow is formed with an annular flange at the end adjacent said air inlet, and said hood is formed with an annular gas outlet directed toward said flange.
Claim 6
Dependent Claim
41 words
A waste gas recycling apparatus as claimed in claim 1, further comprising a main duct connected to said heat storage chamber for releasing waste gas to the atmosphere, and a discharge duct connected between said main duct and said recycling duct.
Claim 7
Dependent Claim
41 words
A waste gas recycling apparatus as claimed in claim 5, further comprising adjustable dampers positioned within said second duct, within said recycling duct, within said discharge duct, and within a portion of said main duct close to said heat storage chamber.
References Cited (Backward Citations)
US3163520A
Cited
US3565407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |