| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.10 ( December1984 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Rotary Furnace for Silicon Steels Kimio Maeyama, Takekazu Sekiya, Shigeru Yoshida, Akifumi Izumoto, Osamu Ueda |
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Synopsis : A new type of coil annealing furnace, No.1 and No.2, for silicon steel production started operation, in October 1979 and September 1983 respectively, at Hanshin Works of Kawasaki Steel Corp. It help 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 make incombustible. The new-type No.1 furnace saves 20% energy compared with the conventional batch type furnace and also shortens the cycle time by 30%. Furthermore, 50% energy saving is achieved in No.2 furnace. 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 lower cost. |
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