WATER-COOLED LANCE FOR REFINING, AND DECARBURIZATION BLOWING METHOD

• Main Author: IMOTO TAKEO
• Format: Patent
• Language: English; Japanese
• Published: 09.07.2020
• Subjects: CHEMISTRY; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

To efficiently cool a lance tip and a lance outer circumference in a water-cooled lance for refining and to suppress a lance-stuck metal upon decarbonization blowing.SOLUTION: A water-cooled lance for refining has a structure where cooling water is circulated via independent feed flow passages of at least two systems, and comprises: a first feed flow passage in which cooling water is circulated from the upper part of the inner wall of a lance outer circumferential tube toward the lower part thereof to cool the outer circumference of the lance; a second feed flow passage in which cooling water is circulated from the upper part toward the lance tip at the inside than the first flow passage to cool the lance tip; and an exhaust flow passage in which the cooling water circulated through the feed flow passage is carried to the upper part.SELECTED DRAWING: Figure 1 【課題】精錬用水冷ランスにおいてランスチップやランス外周を効率的に冷却し、脱炭吹練時におけるランス付着地金を抑制する。【解決手段】少なくとも２系統の独立した供給流路を介して冷却水を循環させる構造を有する精錬用水冷ランスであって、ランス外周管の内壁の上部から下部に向かって冷却水を流通させることでランスの外周を冷却する、第１の供給流路と、前記第１の流路よりも内側において上部からランスチップに向かって冷却水を流通させることで前記ランスチップを冷却する、第２の供給流路と、前記供給流路を流通した前記冷却水を上部へと輸送する、排出流路とを備える、精錬用水冷ランスとする。【選択図】図１