Title:
【発明の名称】直流アーク溶解炉およびその操業方法
Document Type and Number:
Japanese Patent JP3341609
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a DC arc melting furnace having high heat transfer efficiency from arc heat and gas generated in the furnace to scrap by suppressing a decrease in mean input power without raising a movable electrode at the time of instantaneously generating a side arc. SOLUTION: A shape of a furnace body is set with L/D=0.5 to 1.4, where L is a height to an upper end of an inside wall of a furnace and D is an inner diameter of the furnace. When a power input controller receives a voltage drop signal of the case that a voltage drops from a predetermined value and a current application signal of the case that current is a predetermined value or more, rise or fall of a movable electrode 1 is first stopped. After the drop signal and the flow signal are continued for a predetermined time or more, the electrode 1 is quickly raised to eliminate a short-circuit. Thus a cost is reduced and productivity is improved by improvements in thermal efficiency and mean input power at the time of melting scrap.
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Inventors:
Hideaki Mizukami
Shuzo Uchino
Hiroshi Kubo
Keiji Wakahara
Hidehiko Yado
Shuzo Uchino
Hiroshi Kubo
Keiji Wakahara
Hidehiko Yado
Application Number:
JP34919996A
Publication Date:
November 05, 2002
Filing Date:
December 27, 1996
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
H05B7/148; F27B3/08; F27B3/28; H05B7/20; (IPC1-7): F27B3/08; F27B3/28; H05B7/148; H05B7/20
Attorney, Agent or Firm:
Yasuo Ishikawa