OPERATION OF SHAFT FURNACE

摘要

PROBLEM TO BE SOLVED: To prevent adhesion and deposition of dust in the vicinity of a raw material charging side of a top part, to smoothly lower the top charged stuff, and to appropriately keep the in-furnace permeability in the operation of a shaft furnace of a material seal structure. SOLUTION: In manufacturing a hot metal by charging iron source raw material, cokes and sub raw materials to a top part of a shaft furnace, air is fed through a lower tuyere part, and the iron source raw material is molten by the combustion heat of cokes and/or carbon material to be blown through the tuyere part, the ratio [Vs/Vi] of the throat gas flow speed Vs to the in- furnace upward gas flow speed Vi exceeds 0.5, and the throat gas flow speed Vs is >=1.0 m/sec. in terms of the empty tower standard.