METHOD FOR PREVENTING FROM BIG SCAB FORMATION AT THE BOSH AND BELLY OF ALL STAVE COOLED BLAST FURNACE

摘要

PURPOSE: A method for preventing from inactivation in the lower part of a blast furnace is provided to prevent the state that it is difficult to perform normal operation of the blast furnace since an adhesion material is excessively grown in the lower part of the furnace due to increase of cooling capability in an all stave cooled blast furnace. CONSTITUTION: The method for preventing from inactivation in the lower part of a blast furnace comprises the processes of performing iron ore non-classification charging(111) in which iron ore is uniformly distributed from the furnace wall part(30) to the central part in the state that iron ore consisted of large sized ore of 12 mm or more and small sized ore of 11 mm or less is not classified per grain sizes; performing coke distribution control in which a coke peak(112) is formed at a point that is 1.2 to 1.4 m distanced from the furnace wall(30) when charging coke from the furnace wall(30) to the central part of the furnace(24), and a peak type coke/iron ore charging in which an iron ore peak(113) is formed at a point that is 1.3 to 1.5 m distanced from the wall part by charging the iron ore from the point where the coke peak(112) is formed to the central part of the furnace(24); and charging middle sized coke(114) charged along with the iron ore so that the middle sized coke(114) is rested in a space that is within 1.5 m from the furnace wall part(30) into which the middle sized coke is first discharged from a furnace top hopper, thereby improving breathability by increasing porosity inside an iron ore layer of the furnace wall part so as to prevent an adhesion material from being excessively grown in the lower part of the furnace.