Siemens Aktiengesellschaft

Primetals Technologies Germany Gmbh

Dieter Fink

Detlef Rieger

Thomas Matschullat

Detlef Gerhard

Arno Döbbeler

Reinhard Sesselmann

In a method for operating an electric arc furnace operated with an alternating voltage, a structure-borne sound signal occurring on a wall of the electric arc furnace is detected, from which structure-borne sound signal a parameter characterizing the flicker properties of the electric arc furnace is calculated. At least one process variable of the electric arc furnace is controlled on the basis of the calculated parameter. An electric arc furnace operated according to the method is used in and for a melting plant.

Method for operating an electric arc furnace and melting plant having an electric arc furnace operated according to said method

In a method for determining a state variable of an electric arc furnace, especially for determining the level of the foamed slag () in a furnace, the energy supplied to the furnace is determined with the aid of at least one electric sensor while solid-borne noise is measured in the form of oscillations on the furnace. The state variable is determined by a transfer function which is determined by evaluating the measured oscillations and evaluating measured data of the electric sensor. The state of the foamed slag level can thus be reliably recognized and be monitored over time. The foamed slag level is decisive for the effectiveness with which energy is fed into the furnace. Furthermore, losses caused by radiation are reduced by covering the arc with the foamed slag. The improved measuring method allows the foamed slag level to be automatically controlled or regulated in a reliable manner.

Method for determining at least one state variable of an electric arc furnace, and electric arc furnace

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Bubenreuth, Germany

Dieter Fink