| 摘要 |
<p>The invention relates to a method for determining a state variable of an electric arc furnace, especially for determining the level of the foamed slag (15) in an electric arc furnace. According to said method, the energy supplied to the electric arc furnace is determined with the aid of at least one electric sensor (13a, 13b, 13c) while solid-borne noise is measured in the form of oscillations on the electric arc furnace. The at least one state variable, particularly the level of the foamed slag (15), is determined by means of a transfer function which is determined by evaluating the measured oscillations, i.e. the solid-borne noise, and evaluating measured data of the at least one electric sensor (13a, 13b, 13c). The state of the level of the foamed slag (15) can thus be reliably recognized and be monitored over time. The level of the foamed slag (15) is decisive for the effectiveness with which energy is fed into the electric arc furnace. Furthermore, losses caused by radiation are reduced by covering the arc (18) with the foamed slag (15). The improved measuring method allows the level of the foamed slag to be automatically controlled or regulated in a reliable manner.</p> |
