PRE-REDUCTION FURNACE IN SMELTING REDUCTION DEVICE FOR IRON ORE

摘要

PURPOSE:To easily remove dust stucked to the inner face of a nozzle hole by providing gas flow inlets on the lower part of cylindrical body embedding an upper part in a dispersing plate body in a pre-reduction furnace to be nozzle holes and allowing the lower part of this cylindrical body to be opened/closed with a lid body. CONSTITUTION:The dispersing plate 5 penetrating plural nozzle holes 6 is disposed in the inside of the pre-reduction furnace body A and segmented into a pre-reduction chamber 13 forming a fluidized bed at the upper part and a gas injecting chamber 14 at the lower part. In the above-mentioned fluidized bed type pre-reduction furnace, the nozzle holes 6 in the above-mentioned dispersing plate 5 are constituted of metal cylindrical bodies 7 embedded in the refractory-made dispersing plate body 51 at the upper part and arranging the gas flow inlets 8 at the lower part. Upper part of this cylindrical body 7 is opened and the lower end hanging downward is penetrated to out of the furnace at furnace bottom part 9, and this lower end is closed with the lid body 10 capable of opening/closing. During operating the pre-reduction furnace, reducing gas from a gas introducing hole 15 is introduced into the pre-reduction chamber 13 from the gas flow inlet 8 through the cylindrical body 7 and the nozzle hole 6, and also by suitably opening the lid body 10, cleaning device 11 providing an injection pipe 12 is inserted and the stuck dust in the nozzle hole 6 is blasted and removed.