| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a blast furnace operation method capable of suppressing elevation of the CO<SB POS="POST">2</SB>concentration in a furnace top gas so as to secure a gas utilization rate of ≤54.8% and of suppressing deterioration of the condition of discharging zinc outside the furnace when performing a low reducing material rate operation using ferrocokes as a raw material for charging in the blast furnace. <P>SOLUTION: The blast furnace operation method is characterized by suppressing a CO gas utilization rate to ≤54.8% and promoting the discharge of zinc by increasing the hydrogen amount charged in the furnace when performing the low reducing material rate operation of the blast furnace using ferrocokes as the raw material. It is preferable to increase the charge amount of hydrogen by blowing a gas containing large amounts of hydrogen from a tuyere in the furnace or by increasing a blast moisture. The gas containing large amounts of hydrogen is preferably LNG or a coke-oven gas. <P>COPYRIGHT: (C)2012,JPO&INPIT |
