Method and apparatus for operating a direct-current arc furnace
AssigneeMAN Gutehoffnungshutte Aktiengesellschaft
InventorManfred Schubert
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Abstract
In a direct-current arc furnace, the service life of the bottom electrode can be extended substantially, if the cooling unit cooling the bottom electrode during the melting operations is not switched off during longer stoppages, as has been customary thus far, but continues to be operated at a reduced cooling output during at least a part of the stoppage. The cooling unit is preferably controlled during the stoppage according to such a program and in dependence of the respective measured temperature of the bottom electrode, so that the temperature of the bottom electrode is maintained within a preset range.
Claims8
A method for operating a direct current arc furnace having a bottom electrode and a cooling unit, comprising during the melting and tapping operations, operating the cooling unit to cool the bottom electrodes so as to maintain it at a substantially constant temperature, and during stoppages when melting and tapping operations are stopped operating the cooling unit at a reduced cooling output for at least a part of the stoppage.
A device for operating a direct-current arc furnace to maintain an electrode at a selective temperature, comprising a cooling unit mounted below the arc furnace providing a flow of a cooling medium over the electrodes, and a control device connected to said cooling unit regulating the flow of the medium, and means for sensing the temperature in the vicinity of the electrodes and regulating the control device in accordance with the sensed temperature.
Dependencies are inferred from the claim text.