Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1994-11-08
1996-06-11
Hoang, Tu
Industrial electric heating furnaces
Arc furnace device
Power supply system
373108, H05B 7144
Patent
active
055263747
ABSTRACT:
A direct current electric arc furnace for melting metal, which furnace includes a furnace vessel having a lower vessel part lined with a refractory material and a metal upper vessel part through which a cooling agent can flow. A cover is adapted and arranged to close the furnace vessel. Electric current is fed to the furnace, by an arrangement including a main electrode extending into the furnace vessel through the cover, a bottom electrode located at the bottom of the lower vessel part, and feed lines that connect the electrodes to a direct current source. The feed lines include at least two current feeds connected to the bottom electrode, each current feed having a line segment parallel to a main axis of the main electrode and a shield for at least partially magnetically shielding the upper vessel part at an arc level from magnetic fields generated by the line segments parallel to the main axis. A drive moves the shield parallel to the line segment in order to weaken a magnetic field produced by the current at the arc level.
REFERENCES:
patent: 3885082 (1975-05-01), Hanas
patent: 4356340 (1982-10-01), Stenkist
patent: 4856021 (1989-08-01), Janiak et al.
Hoang Tu
Mannesmann Aktiengesellschaft
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