| 摘要 |
<p>PURPOSE: To improve an iron tapping ratio in a blast furnace by effectively combining charge of metallic iron raw material from a furnace top with blowing of pulverized fine coal from tuyeres, in a blast furnace operation by a method for blowing large quantity of the pulverized fine coal from the tuyeres. CONSTITUTION: In the case of reducing the consumption of expensive lamp coke for the blast furnace by blowing the inexpensive pulverized fine coal at >=150kg/ton of molten iron from the tuyeres at the time of operating the blast furnace, the metallic iron base raw material, such as pig iron, steel scrap, reduced pellet, is charged from the furnace top part of the blast furnace simultaneously with the feed of the blowing quantity P (kg/t) of the pulverized fine coal. The blast furnace operation excellent in the reduction of iron-making cost, the increase of iron tapping amt. and the lowering of fuel ratio, etc., can be executed without increasing the enriched oxygen quantity from the tuyere by satisfying inequalities of W<=P+100 and W>=P-150 in a relation between the blowing quantity P of pulverized fine coal and the unit requirement W (kg/t) of charged quantity of the metallic iron base raw material from the furnace top.</p> |
