Method and apparatus for closing the gap between an electrode and its furnace cover in an electric furnace.

摘要

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.