Title:
DC ARC FURNACE
Document Type and Number:
Japanese Patent JP3533552
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To control the deflecting direction of an arc, reduce original electrode unit cost, prevent the damage of an equipment and improve a melting efficiency in a dc arc furnace having two upper electrodes.
SOLUTION: A dc arc furnace comprises a furnace main body 1 having a furnace bottom electrode 3 on a bottom part, two upper electrodes 4 and 5 elevated and lowered in the furnace main body, upper feed conductors 10 and 11 connected to the upper electrodes 4 and 5, a lower feed conductor 9 connected to the furnace bottom electrode and dc power sources 6 and 7 provided between the ends of the upper feed conductors 10, 11 and the lower feed conductor 9. A magnetic field generator 8 for forming vertical magnetic fields 22 in arc generating positions is provided below the furnace main body. At this time, the horizontally circulating coil shaped lower feed conductor can be also used as the magnetic field generator 8. The intensity of the vertical magnetic field 22 is made larger than that of a horizontal magnetic field 21 or two systems of dc power sources are provided to control individually currents supplied to the two upper electrodes 4 and 5 with larger effect.
Inventors:
Norio AO.
Kubo, Hirotsugu
Yamamoto, Shinpei
Kubo, Hirotsugu
Yamamoto, Shinpei
Application Number:
JP12924297A
Publication Date:
May 31, 2004
Filing Date:
May 20, 1997
Export Citation:
Assignee:
NKK CORP
International Classes:
F27B3/08; F27D11/08; (IPC1-7): F27D11/08; F27B3/08
Attorney, Agent or Firm:
小林 久夫 （外３名）