| 摘要 |
PURPOSE:To restrain the occurrence and increment of adhesive matters on the furnace wall by removing the zinc and alkali group from a blast furnace by a method that when zinc and alkali contents in gas and ash of the furnace increase, the charge level is lowered and the admixture of CaCl2-NH4Cl is charged. CONSTITUTION:When analytical values of zinc and alkali group in the gas and ash of a blast furnace collected from inside the furnace increases, the furnace operation is carried out with decreased charge level, and, at the same time, CaCl2-NH4Cl admixture is charged. When chloride is charged, zinc and alkali group which are circulating inside the furnace are discharged from the furnace system as ZnCl, NaCl, KCl. By this method, zinc and alkali can be efficiently removed in a short time, deterioration of coke in the lower part of the furnace caused by the increase of alkali content circulating in the furnace can be prevented, the occurrence and increment of adhesive matters can be restrained, and existing adhesive matters become brittle, fall and can be removed. Consequently, the blast furnace operation can be stabilized. |
