| 摘要 |
PURPOSE:To reduce bias of distribution of heat flowing ratio to circular direction and to uniformize Si content in molten iron to the circular direction in the furnace by measuring the distribution of the heat flowing ratio to the circular direction in the furnace at the time of operating a blast furnace and controlling hot blast flowing rate with a hot blast control valve arranged to tuyere based on the above measured valve. CONSTITUTION:At the time of operating the blast furnace, temp. and pressure is each zone 11-14 equally dividing the cross sectional plane in the blast furnace into four are detected with detectors 20, and the data are transmitted into a calculator 15 from a measuring instruction 7 and at there, the heat flowing ratio at each zone 11-14 is calculated. This calculated value is inputted into a controlling device 16 and opening degree of flow rate control valve for hot blast arranging to the tuyere group 21-24 at the four zones corresponding to the zones 11-14 in accordance with the deviation is adjusted, so that the above deviation becomes the min. When the deviation of the heat flowing ratio reduces by adjusting hot blast flowing rate from each tuyere group 21-24 at four ranges, the deviation in the temp. of the molten iron to the circular direction in the blast furnace is eliminated, and the deviation of Si content in the molten iron tapped below each tuyere group 21-24 is made to extremely little. |
