F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
F27B 3/08 (2006.01) C21C 5/52 (2006.01) H05B 7/06 (2006.01) H05B 7/08 (2006.01) H05B 7/148 (2006.01)
Patent
CA 2054774
According to the present invention there is provided a direct current electric furnace for melting metal capable of melting scraps rapidly and also capable of diminishing cold and hot spots formed on the furnace wall. The direct current electric furnace is provided with a single top electrode, a plurality of furnace bottom electrode, a plurality of furnace bottom electrodes or a plurality of electrode units obtained by dividing a multitude of furnace bottom electrodes of a small diameter into plural units, and electric current controlling thyristor circuits for controlling each individually electric currents flowing through the said plural furnace bottom electrodes or electrode units. The said electric current controlling thyristor circuits may be substituted by thyristor circuits for controlling electric currents for each of plural groups obtained by dividing the above plural furnace bottom electrodes or the above many furnace bottom electrodes or the above plural electrode units into the plural groups.
Iwamura Tadaaki
Miyazaki Yasuharu
Numata Koji
Ohtsubo Shunji
Takahashi Kiyoshi
Kawasaki Steel Corporation
Smart & Biggar
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