Method and apparatus for stabilizing electric furnace arcs using

Details Method and apparatus for stabilizing electric furnace arcs using Method and apparatus for stabilizing electric furnace arcs using

1988-06-02

1989-03-21

Envall, Jr., Roy N.

Industrial electric heating furnaces

Arc furnace device

Power supply system

H05B 720

Patent

active

048150975

ABSTRACT:
Stabilizing the arc in an electric arc furnace is achieved by using a method and apparatus for applying a magnetic field parallel to the arc between the furnace electrodes. The magnetic field strength applied by the invention should exceed (h.mu.oI)/(2.pi..sup.2 a.sup.2) where h is the distance between the electrodes, a is the radius of the arc, I is the current between the electrodes and .mu.o is the permeability of free space. The magnetic field may be induced by any means not susceptible to the heat of the furnace, such as a coaxially positioned induction coil or by inducing a magnetic field in an open magnetic ring the ends of which form the furnace electrodes.

REFERENCES:
patent: 4149024 (1979-04-01), Stenkvist et al.
patent: 4495625 (1985-01-01), Heberlein et al.
THE PHYSICS OF HIGH CURRENT ARCS by Bowman, Jordan and Fitzgerald (The Journal of the Iron and Steel Institute, Jun. 1969, pp. 798-805).
THE EFFECT OF ARC FURNACE ELECTRICAL NOISE AND POWER SYSTEMS by Borrebach (Electric Furnace proceedings, 1975, pp. 217-222).
NOISE REDUCTION AND ELECTRIC ARC FURNACES BY ELECTROTECHNICAL MEANS (Internoise 80 Proceedings, Dec. 1980, pp. 471-474) by Engdahl of the Institute of High Voltage Research, Uppsala, Sweden.

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