| 摘要 |
PURPOSE:To stably operate an oxygen blast furnace over a long period, by supplying sensible heat corresponding to the increase of heat loss with preheated gas blown from a shaft during the low rate of operation of the blast furnace. CONSTITUTION:When pig iron smelting operation is carried out at a low rate of operation at the time of occurrence of trouble or regulation of production, heat loss increases relatively from that during normal operation by the reduction of the amt. of pig iron tapped, so sensible heat corresponding to the increase of heat loss is supplied with preheated gas blown from a shaft. Iron smelting operation can be stably carried out at a low rate of operation.
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