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連続鋳造における拘束性ブレークアウトの予知・防止システムの開発

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川崎製鉄技報

KAWASAKI STEEL GIHO Vol.20 (1988) No.3

連続鋳造における拘束性ブレークアウトの予知・防止システムの開発

Development of System for Predicting and Preventing Sticking Type Breakout in Continuous Casting

糸山 誓司(Seiji Itoyama) 寺嶋 司(Tsukasa Terashima) 田中 修二(Syuji Tanaka) 山中 啓充(Hiromitsu Yamanaka) 弓手 崇生(Takao Yunde) 井口 弘明(Hiroaki Iguchi) 要旨 : 高温鋳片の製造と直送圧延プロセスを支えるために必須である高速連鋳操業の安定化を図 るため,鋳型銅板測温法により拘束性ブレークアウトの発生を予知・防止するシステムを 千葉製鉄所の第1 および第 3 連鋳機で開発した。拘束性ブレークアウト予知の信頼性向上 は,鋳型幅方向の多点測温により可能であり,検出率は100%,予知率は 85.7%,誤報発生 頻度は0.0002 回/ヒートである。拘束性ブレークアウト予知後,鋳造速度を減少してブレー クアウトを回避するための最小減速量を,ブレークアウト予知時の鋳造速度によって変え ることにより,ブレークアウトを回避している。 Synopsis :

A method to detect and prevent a sticking type breakout in continuous casting was studied in order to avoid operational trouble associated with breakout at high speed casting. After intensive studies, the method was applied as a prediction and prevention system first to No. 1 and then to No. 3 continuous casters in Chiba Works. Test operation showed that the system was a powerful aid for preventing the breakout, and the system was effectively used in commercial operation. Results obtained are summarized as follows:(1) The breakout can be successfully predicted by thermocouples installed in parallel to meniscus in the mold copper plate. (2) All the breakout can be detected, but 14.3% of breakout alarms are false and the frequency of the false alarm is 0.0002 tine per heat. (3) When the breakout sensor alarms, the casting speed is instantly lowered down to the predetermined allowable level to avoid the breakout. (c)JFE Steel Corporation, 2003

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