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US3876418A
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US
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Method for collecting the flue gases produced upon the charging of scrap and tapping of steel from electric furnaces
Assignee: Verfahrenstechnik Dr Ing Kurt Baum
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Filing: 1972-07-10
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Granted: 1975-04-08
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Expires: 1992-07-10
Abstract
Abstract This disclosure teaches a method and related system for collecting gases generated upon charging of scrap to and tapping of steel from an electric furnace. A charging basket is brought into sealed engagement with the furnace and is subjected to a vacuum. The top of a ladle is provided with an opening which is also subjected to a vacuum. Gases from the charging basket and from the ladle are delivered to a main aspirator duct to join gases generated during furnace operation for subsequent treatment.
Inventors
- 👤 Jorg Peter Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:30
CPC Classifications
F; F27; F27D; F27D17/00; F27D17/30; F27D17/304; F27D17/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
A METHOD FOR RECOVERING GASES FROM AN ELECTRIC FURNACE, HAVING AN OPENING IN A TOP PORTION THEREOF, WHICH GASES ARE PRODUCED DURING CHARGING OF MATERIAL TO THE FURNACE FROM A CHARGE BASKET THROUGH THE OPENING AND IN TAPPING MATERIAL FROM THE FURNACE BY TILTING THE FURNACE AND POURING MATERIAL THROUGH A SPOUT INTO A LADLE HAING AN OPENING IN ITS TOP, AND WHEREIN GASES PRODUCED DURING REGULAR OPERATION OF THE FURNACE ARE RECOVERED BY ASPIRATION THROUGH AN ASPIRATOR DUCT, THE METHOD COMPRISING STEPS AS FOLLOWS: BRINGING THE CHARGE BASKET INTO TIGHT COMMUNICATION WITH THE OPENING IN THE FURNACE; SUBJECTING A SPACE COMPRISING THE INSIDE OF THE CHARGE BASKET AND THE INSIDE OF THE FURNACE OF A VACUUM; SHUTTING OFF FLOW OF GASES FROM THE FURNACE THROUGH THE ASPIRATOR DUCT; OPENING A CONNECTION BETWEEN THE CHARGE BASKET AND THE ASPIRATOR DUCT; AND WITHDRAWING GASES DURING THE CHARGING THROUGH THE BASKET VIA THE ASPIRATOR DUCT.
Claim 2
Independent Claim
153 words
A METHOD FOR RECOVERING GASES FROM AN ELECTRIC FURNACE, HAVING AN OPENING IN A TOP PORTION THEREOF, WHICH GASES ARE PRODUCED DURING CHARGING OF MATERIAL TO THE FURNACE FROM A CHARGE BASKET THROUGH THE OPENING AND IN TAPPING MATERIAL FROM THE FURNACE BY TILTING THE FURNACE AND POURING MATERIAL THROUGH A SPOUT INTO A LADLE HAING AN OPENING IN ITS TOP, AND WHEREIN GASES PRODUCED DURING REGULAR OPERATION OF THE FURNACE ARE RECOVERED BY ASPIRATION THROUGH AN ASPIRATOR DUCT, THE METHOD COMPRISING STEPS AS FOLLOWS: BRINGING THE CHARGE BASKET INTO TIGHT COMMUNICATION WITH THE OPENING IN THE FURNACE; SUBJECTING A SPACE COMPRISING THE INSIDE OF THE CHARGE BASKET AND THE INSIDE OF THE FURNACE OF A VACUUM; SHUTTING OFF FLOW OF GASES FROM THE FURNACE THROUGH THE ASPIRATOR DUCT; OPENING A CONNECTION BETWEEN THE CHARGE BASKET AND THE ASPIRATOR DUCT; AND WITHDRAWING GASES DURING THE CHARGING THROUGH THE BASKET VIA THE ASPIRATOR DUCT.
Claim 3
Dependent Claim
51 words
A method according to claim 1 further comprising: maintaining a flow of air over the opening in the top of the ladle at a rate of 5 to 10 meters per second; and withdrawing gases from the ladle at a point below the top of the ladle via the aspirator duct.
Claim 4
Dependent Claim
35 words
A method according to claim 2 wherein during removal of gases during the tapping of material from the furnace connection between the furnace and the aspirator duct is closed gradually as the furnace is tilted.
Claim 5
Dependent Claim
26 words
A method according to claim 2 wherein gases removed during the charging, tapping and regular operation of the furnace are combined and purified by subsequent treatment.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |