METHOD OF CONTROLLING LENGTH OF ELECTRIC ARC IN ELECTRIC ARC FURNACE, DEVICE FOR CARRYING OUT METHOD, AS WELL AS ELECTRIC ARC FURNACE WITH SUCH DEVICE Russian patent published in 2016 - IPC F27B3/28 F27D19/00 F27D21/04 C21C5/52 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and can be used for regulating length of electric arc in an arc furnace. Method comprises measuring vibrations at a wall of furnace vessel, through which is determined a slag height (H_rel) of melt, wherein when at deviations of a determined actual slag height (H_rel) from a given value (S), control and/or regulation signals are output, through which is set electric arc length of at least one electrode by regulation of impedance of at least one electrode. Device comprises at least one structure-borne sound sensor for detecting vibrations at a wall of furnace vessel, computing unit configured to calculate an actual value of a slag height (H_rel) in furnace vessel, and a control or regulating unit for adjusting electric arc length of at least one electrode by regulating impedance of at least one electrode at deviation of actual slag height (H_rel) from specified value.

EFFECT: invention provides fast response to change of slag height, wherein fuzzy logic-based control system generates correction coefficients for individual electric arc lengths over a short reaction time of approximately one second.

28 cl, 2 dwg