STRUCTURE FOR FURNACE BOTTOM OF BLAST FURNACE AND OPERATION OF BLAST FURNACE

摘要

PROBLEM TO BE SOLVED: To take an operational measure to stop temp. rising and to surely, quickly apply the effect of the measure to the temp. rising position at the time of detecting the temp. rising tendency at the side wall part of furnace hearth in a blast furnace. ;SOLUTION: The furnace bottom structure of this blast furnace is provided with one or more of iron and slag tapping holes at higher position than the iron tapping hole level by 1 m to 2 m. In the operation of the blast furnace having the above structure, in the case the temp. shown in a temp. sensor arranged at the side wall part of the furnace hearth at the lower part from the iron tapping hole level shows the rising tendency and the temp. shown in a temp. sensor arranged at the center part of the furnace bottom shows the lowering tendency, the iron and slag are tapped from the upper and the lower iron and slag tapping holes at the same time and at the point of time when the slag tapping from the upper iron and slag tapping hole completes, the lower iron tapping hole is plugged. Further, during the operation, when the temp. shown in the temp. sensor arranged in the side wall part of the furnace hearth at the lower part from the iron tapping hole level changes to the lowering tendency and the temp. shown in the temp. sensor arranged at the center part of the furnace bottom stops the temp. lowering or changes to the rising tendency, the iron and slag tapping from the lower iron and slag tapping hole is executed.;COPYRIGHT: (C)1998,JPO