| 摘要 |
PURPOSE:To maintain the accumulation amt. of molten iron and slag at a specified level or below and to operate stably a blast furnace by measuring continuously the molten iron temp. during tapping from the blast furnace and discriminating the closing period of the tap hole in accordance with the measured value. CONSTITUTION:The tap hole 2 of the blast furnace 1 is opened to tap the high- temp. molten iron in the hearth to a large spout 4. The molten slag is separated in a spout 5. The molten iron is tapped by a molten iron spout 7 to a transport car, etc. The molten iron temp. is continuously measured by a fiber scope 9 during this time and the output signal thereof is recorded via a two-color pyrometer 9 and a converter 10 in a recorder 11. On the other hand, a time- differentiated value ( deg.C/min) is calculated by a calculator and the value thereof is recorded in the recorder 11. The change of the above-mentioned time differentiated value is continuously discriminated and the tap hole 2 is closed by a mud gun 3 when the value thereof exceeds certain negative reference value. The accuracy in the discrimination of the time for closing the tap hole is improved and the operation of the blast furnace is stabilized by the above- mentioned method. |
