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川崎製鉄技報
KAWASAKI STEEL GIHO
Vol.15 (1983) No.4
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珪素鋼用回転焼鈍炉
Rotary Furnace for Silicon Steel

前山 公夫(Kimio Maeyama) 関谷 武一(Takekazu Sekiya) 出本 晃文(Akifumi Izumoto) 上田  修(Osamu Ueda)
要旨 :
方向性珪素鋼帯の製造における最終焼鈍工程での省エネルギ,生産性の向上,品質の安定化を目的として,従来のバッチ型焼鈍炉にかわり,回転炉床式連続焼鈍炉を開発した。約1200℃という苛酷な温度条件下で,かつ炉内を100%水素雰囲気とする焼鈍工程の連続炉化は,過去に直線型の例はあるが,本炉はマッフルを用い,炉内を酸化雰囲気としてマッフルからの漏洩H2ガスを燃焼,ないし希釈する方法で処理する新型炉である。昭和54年10月稼働以来,安定操業を続けており,本炉の完成により省エネ20%,焼鈍サイクル短縮30%,電磁特性のバラツキ減少等の効果を挙げた。
Synopsis :
A new type of coil annealing furnace for silicon steel products started operation in October 1979 at Hanshin Works of Kawasaki Steel Corp. It helps save both time and money substantially and contributes significantly to quality improvement. This furnace is a rotary furnace equipped with muffles. The annealing temperature is 1200℃ and a pure hydrogen gas is used to get a good glass film and purification. Hydrogen gas which has leaked from the muffles into the heating zone is burned in the furnace with excess air, and the hydrogen gas which has leaked from the muffles into the cooling zone is diluted with air and made incombustible. The new-type furnace saves 20% energy compared with the conventional batch type furnace and also shortens the cycle time by 30%. Coil annealing is a critically important process in the manufacture of grain-oriented silicon steels. By using this new equipment, the production system and operation technology have been successfully established for producing silicon steels with high productivity at low cost.
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