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Title:
THREE-PHASE ALTERNATING CURRENT ARC FURNACE AND CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2021/176995
Kind Code:
A1
Abstract:
This three-phase alternating current arc furnace for melting solid metal raw materials with an arc, said furnace comprising: a furnace body in which a solid metal raw material is charged and which has a cylindrical upper furnace shell and lower furnace shell; three electrodes for forming an arc inside the furnace body; an electrode lifting and driving device for lifting and driving each of the three electrodes separately; and a water-cooled panel provided on the inner circumference of the upper furnace shell. The water-cooled panel includes a first portion provided in a first region, which is a region close to the three electrodes out of the whole circumference of a virtual circle substantially coincident with the shape of an inner wall upper edge of the lower furnace shell in plan view, and a second portion provided in a second region, which is a region, out of the whole circumference of the virtual circle in plan view, where the distance to a point on the virtual circle from the three electrodes is further than in the first region. The three-phase alternating current arc furnace further comprises a temperature detection unit for detecting at least one of the temperature of the first portion of the water-cooled panel and the temperature of the cooling medium flowing in the first portion, and a control device for controlling the electrode lifting and driving device on the basis of the temperature detected by the temperature detection unit.

Inventors:
AO NORIO (JP)
WAKAHARA KEIJI (JP)
OYAMA SHIGERU (JP)
SATO YASUHIRO (JP)
Application Number:
PCT/JP2021/005266
Publication Date:
September 10, 2021
Filing Date:
February 12, 2021
Export Citation:
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Assignee:
JP STEEL PLANTECH CO (JP)
International Classes:
F27B3/24; F27B3/28; F27D9/00; F27D11/08; F27D19/00
Domestic Patent References:
WO2013099807A12013-07-04
Foreign References:
JPH11162632A1999-06-18
JPH11293326A1999-10-26
JP2020016345A2020-01-30
JP2018070926A2018-05-10
JPH03225193A1991-10-04
JPS63121612A1988-05-25
Attorney, Agent or Firm:
KOHNO, Hideto et al. (JP)
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