| 摘要 |
PURPOSE:To always stabilize furnace conditions even if the grain size of ore is small and to make efficient operation by adjusting the grain size of the ore to be deposited on the wall side of a blast furnace to the average grain size or above of the ore to be charged into the furnace at the time of operating the blast furnace by changing a method for charging raw materials. CONSTITUTION:The ore is dropped with the position slightly nearer the central 1 side than the furnace wall 2 as a falling point from an armor plate 6 when, for example, the blast furnace is of a bell type. The charging of the raw materials to the blast furnace is executed in such a manner that coke layers 3 and ore layers 4 are alternately laminated. Dw is adjusted to >=-D when the grain size of the ore 5 to be deposited on the furnace wall 2 side is designated as Dw, and the average grain size over the entire part of the ore to be charged as -D. The gaseous flow distribution in the blast furnace is thus optimized by charging the ore 5 into the furnace and permitting the control thereof. The operation of the blast furnace is thus controlled stably with decreased slips.
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