Process and arrangement for operating a double furnace installation

Patent 5499264 Issued on March 12, 1996. Estimated Expiration Date:

January 24, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3612740

DC electric arc melting apparatus Patent #: 5204873
Issued on: 04/20/1993
Inventor: Imagawa

Inventors

Application

No. 185552 filed on 01/24/1994

US Classes:

373/78, Plural furnace units373/80With charge pre-heating

Examiners

Primary: Hoang, Tu Ba

Attorney, Agent or Firm

Cohen, Pontani, Lieberman, Pavane

Foreign Patent References

2259907 FR. 08/21/1975
3307400 DE. 01/21/1984
3232139 DE. 03/21/1984
3521569 DE. 12/21/1986
3225514 DE. 03/21/1994

International Class

F27D 023/00

Foreign Application Priority Data

1993-01-25 DE

Abstract

A process for operating a double furnace installation having two arc furnaces connected via a line, a power supply, a device for charging material, and an arrangement for extraction and purification of gas. The process including the step of connecting a first one of the two furnaces with the power supply for melting a charge located therein, completely cutting off a second one of the furnaces from the power supply. The second furnace is then charged with charging material and is closed with a cover. Flue gas located in the closed second furnace is sucked out above the burden column and flue gas is sucked out of the first furnace above the surface of the melted charge through the second furnace via the connection line provided between the two furnaces. A flue gas connection of the first furnace to the gas purification arrangement is interrupted while the flue gas is being sucked out of the second furnace while feed air is simultaneously taken on in the region of a cover of the first furnace.