Evaluation of Productivity and Electric Power Consumption of Twin-shell Type DC Arc Furnace

摘要

Twin shell type DC arc furnace with scrap preheating system was supplied by Daido to Takunan Steel in Okinawa. This furnace is equipped with one power source and two furnace bodies and also high efficiency scrap preheating function, the advantages, functions and operation results are reported in this paper. The summary of the operation results obtained up to now are as follows; 1) Reduction of tap to tap time by 11 min comparing with single furnace, 2) Improvement of maximum 35kWh/t in electric power consumption by scrap preheating, and 3) Reduction of 18kWh/t through effective utilization of post combustion. It should be noted that these operation figures are under the restriction of electric power source. Therefore, not less than the improvement figures described above are expected when normal electric power is inputted in near future.