METHOD FOR COOLING FURNACE BOTTOM IN BLAST FURNACE

PROBLEM TO BE SOLVED: To provide a cooling method of the furnace bottom in a blast furnace with which the wear of a furnace bottom refractory is restrained by suitably setting the cooling condition in the furnace bottom in the blast furnace to control the produced thickness of the stuck material on the furnace bottom. SOLUTION: In the cooling method of the furnace bottom in the blast furnace, with which plural cooling pipes are parallel disposed over the whole surface of the furnace bottom in the blast furnace, and these cooling pipes are divided into a peripheral zone mainly containing a range of the part just under an iron tapping hole and a center zone mainly containing a range in the center part of the furnace, and the peripheral zone is performed in intense cooling and the center zone is performed in soft cooling having smaller cooling performance than that in the peripheral zone, the temperature of cooling water for cooling the center zone is adjusted with various kinds of temperature information. Thus, the left thickness of the stuck material at the center part of the furnace bottom can be controlled without depending on the iron tapping ratio and molten iron and slag quantities in the blast furnace, and the service life in the blast furnace is extended by restraining the damage of the wall refractory on the furnace hearth due to the circulating flow. Further, labor saving is achieved and the driving cost of a cooling water pump for cooling the furnace bottom are drastically reduced by automatizing the control for self-circuited water quantity on the furnace bottom.