TOP-BLOWING LANCE FOR MOLTEN IRON BLOWING, METHOD OF DECARBONATING MOLTEN IRON AND DEPHOSPHORIZED IRON

摘要

PROBLEM TO BE SOLVED: To further reduce a spitting mount by not only making dynamic pressure variation in a circumference direction small without adversely affecting a top-blowing lance life, but also optimizing a distance between ignition points in a top-blowing lance for molten iron blowing having 3 or more holes nozzle positioned at equal intervals on the same circumference.;SOLUTION: Four each relational expressions are satisfied when n denote the number of top-blowing nozzles, γ(deg) denotes a spiral angle which is an angle formed between a projection of a nozzle axis to an xy plane and an x-axis, θ(deg) denotes an inclination angle which is an angle formed between the nozzle axis and a z-axis, L (mm) denotes a distance between an outlet center of a nozzle 2 and a lance center axis, R (mm) denotes a nozzle throat diameter which is a diameter of the nozzle 2 inlet in a xyz orthogonal coordinate system in which a line vertical to a horizontal plane and passing through the nozzle 2 outlet which is an intersection point between a lance edge surface and the nozzle axis is denoted as z-axis and the lance center axis is on the x-axis when the lance is arranged in such a manner that the lance center axis is vertical to the horizontal plane.;COPYRIGHT: (C)2014,JPO&INPIT