Ladle furnace with DC heating

Details Ladle furnace with DC heating Ladle furnace with DC heating

1983-09-08

1985-07-09

Tolin, G. P.

Industrial electric heating furnaces

Arc furnace device

Power supply system

373 85, H05B 720

Patent

active

045286736

ABSTRACT:
A metallurgical ladle furnace has a ladle for containing the melt, an arcing electrode positioned on the ladle's axis, and a melt electrode in the ladle's lower portion and substantially symmetric with respect to the arcing electrode. DC power applied to the electrodes results in an arc between the arcing electrode and the melt for heating the melt and incidentally causing the melt to stir in vertical directions, the melt moving downwardly in the middle below the arc, upwardly along the walls of the melt and inwardly towards the arc. A DC powered coil surrounds the ladle horizontally at half the ladle's height or higher, around the upper portions of the melt. The field of this coil in cooperation with a DC flow in the melt caused by the current flow between the electrodes, provides a substantially tangential stirring force on the melt which is in addition to the stirring force of the electrode current in the melt. This additional force results in the surface of the melt acquiring a concave shape surrounding the arc and protecting the ladle's wall from the arc flare while increasing the melt's energy absorption from the arc.

REFERENCES:
patent: 1562825 (1925-11-01), Evreynoff
patent: 4149024 (1979-04-01), Stenkvist et al.
patent: 4336411 (1982-06-01), Hanas et al.

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