(19)
(11) EP 0 437 037 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.08.1991 Bulletin 1991/32

(43) Date of publication A2:
17.07.1991 Bulletin 1991/29

(21) Application number: 90313013.6

(22) Date of filing: 29.11.1990
(51) International Patent Classification (IPC)5: H05B 7/12
(84) Designated Contracting States:
DE FR GB IT SE

(30) Priority: 11.12.1989 DE 3940848

(71) Applicant: FOSECO INTERNATIONAL LIMITED
Nechells Birmingham B7 5JR (GB)

(72) Inventors:
  • Comes, Heinrich
    W-3-Weseke (DE)
  • Wolf, Josef
    W-4130 Moers (DE)

(74) Representative: Eyles, Winifred Joyce 
Foseco International Limited 285 Long Acre Nechells
Birmingham B7 5JR
Birmingham B7 5JR (GB)


(56) References cited: : 
   
       


    (54) Method and apparatus for closing the gap between an electrode and its furnace cover in an electric furnace


    (57) Method for closing the gap between a graphite electrode (10) and a through-hole for the electrode formed in the furnace cover of an electric furnace by means of a cooling sealing ring (15) made of a refractory material.
    To the gap (11) there is fed a gas-fluid-mixture via a plurality of conduits (1) in the cooling sealing ring (15) uniformly distributed over its circumference, radially inside and aligned in tangential-radial direction with a small axial component which gas-fluid-mixture serves to seal, the fluid of which additionally also withdraws heat from the inside region of the cooling sealing ring by endothermic actions, by vaporisation and/or by cracking to graphite or petrol coke at the surface of the electrode.






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