METHOD FOR BLOWING DUST COAL FROM BLAST FURNACE TUYERE

摘要

PROBLEM TO BE SOLVED: To more largely blow dust coal of low quality having a high SiOin Ash without increasing hot pig iron [Si] in a blast furnace operation in which dust coal is largely blown from a tuyere.SOLUTION: Provided is a method for blowing the fine coal of a plurality of coal kinds from the tuyere of a blast furnace using two fine coal lances, in which installing is performed in such a manner that the positions of the tips of the blow pipes of the two lances are shifted before and after, and the concentration of an SiOcomponent in the Ash of the fine coal blown from the lance on the side of a furnace wall is higher than the concentration of an SiOcomponent in the Ash of the fine coal blown from the lance on the inside of the furnace.