| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a method for operating a blast furnace with which a stable operation can be performed when fine powdery coal and natural gas as an auxiliary reducing material are blown into the blast furnace. <P>SOLUTION: In the method for operating the blast furnace, by which the fine powdery coal and the natural gas as the auxiliary reducing material are blown into the blast furnace from respective different tuyeres, number of the tuyeres for blowing the fine powdery coal and number of the tuyeres for blowing the natural gas, are set so that the number of the tuyeres for blowing the natural gas becomes <70% of the total number of the tuyeres. Further, the theoretical burning temperature in the tuyere for blowing the fine powdery coal, is made to not fall down by≥300°C than the theoretical burning temperature in the tuyere for blowing the natural gas. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
