| 摘要 |
PURPOSE: A high O by C (O/C) type ore reducing method when repairing blast furnace is provided to contribute to improvement of productivity and stabilization of furnace circumstances by regularizing high O/C type charging method and applying high O/C type regular repairing ore reducing method per hours, thereby increasing operating rate in the shortest time. CONSTITUTION: In a regular repairing ore reducing operation for repairing blast furnace under high O by C (O/C) blast furnace operation, the high O/C type ore reducing method when repairing blast furnace comprises a process of securing initial heat by charging 10 charges of O/C having the lowest ore reducing portion into the tip of tuyere; and a process of guiding ideal flowing of gas flow by charging charges starting from O/C having the lower reducing portion in such a manner that 8 charges, 5 charges, 4 charges and 3 charges are sequentially charged on the charged 10 charges, wherein standards of O/C charges having ore reducing portion charged in the respective processes are differently set per blast furnace repairing time period before the O/C charges are applied.
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