TOP AND BOTTOM COMBINED BLOWING CONVERTER HAVING TWO SERIES OF FURNACE BOTTOM TUYERES

摘要

PURPOSE: To provide a top and bottom combined blowing converter which is compatible with the restraint of spitting of molten steel both and the restraint of increase of iron content (T, Fe) in a slag caused by strengthening of stirring of the molten steel bath. ;CONSTITUTION: Tuyeres arranged at the furnace bottom in the top and bottom combined blowing converter are divided into a tuyere group 1-4 at the center part of the furnace bottom and a tuyere groups 5-8 at the intermediate part of the furnace bottom and satisfy the following inequalities and these two tuyere groups can independently be controlled with the flow rate. The tuyeres at the center part of the furnace bottom satisfy an inequality of RN/R ≤0.4...(a). The tuyeres at the intermediate part of the furnace bottom satisfy 0.4RN/R ≤1.6...(b). Wherein, RN: horizontal distance from the center of the furnace bottom to the tuyere, R: radius of the furnace bottom.;COPYRIGHT: (C)1995,JPO