Lance and pulverized coal injection method for pulverized coal injection

摘要

Problem to be solved: to suppress the increase in the temperature of the furnace in the blast furnace operation in which the pulverized coal containing 50% by mass or more of charcoal material which is more combustible than the coal material is blown over 200 kg per ton of iron.Pass through the blow pipeIn two pulverized coal injection lance 5 for blowing pulverized coalFrom the base end into which pulverized coal is blown, it is formed straight to the tip end of which pulverized coal is discharged.Extending toward the axis of the blow pipe;The opening of the tip isA predetermined angle with respect to the reference plane perpendicular to the axial direction of the pulverized coal injection lance θ AndSaid θ Is60 ° Lance for pulverized coal injection.Diagram