| 摘要 |
PURPOSE:To charge effectively raw materials into a blast furnace by detecting beforehand the average grain sizes of the raw materials from the start until the end of discharging of the raw materials from the inside of a lower top hopper with lapse of time and controlling the tilting angle of a swiveling chute in accordance with the same. CONSTITUTION:Raw materials are charged through an upper top hopper 5 into a lower top hopper 4. The kinds of the raw materials and the amt. and average grain sizes thereof are inputted into a setter for raw material conditions prior to charging of the raw materials into a blast furnace 1, and the patterns at each opening of a gate valve 7A with respect to the raw materials having the same averge grain size is beforehand inputted to a control device. When the valve 7A is opened at a prescribed opening, the change in the average grain sizes of the descending raw materials with lapse of time is known from the time elapsed since the first descending of the raw materials, from which the change in the average grain size with time is predicted. Therefore, if the angle of inclination of a swiveling chute 3 is controlled in accordance with the change in the average grain size with time, the raw materials are charged into the blast furnace in the way as to satisfy in the preset operation conditions. |
