2-STAGE FLUIDIZED BED FURNACE FOR PRE-REDUCING FINE IRON ORE AND METHOD FOR PRE-REDUCING FINE IRON ORE USING THE FURNACE

摘要

The 2-stage fluidized bed furnace for pre-reducing a fine iron ore of the present invention comprises a first stage fluidized bed furnace for receiving the fine iron ore from storage hopper, discharging medium/small particles to the upper part thereof, and reducing a coarse particle ore while forming a bubbling fluidized bed; a second stage fluidized bed furnace for receiving the medium/small particles discharged from the upper part of the first stage and reducing it while forming a turbulent fluidized bed; and a first hot cyclone for collecting the small particles contained in the discharged gas from the second stage fluidized bed furnace, the first stage furnace being in an upper narrowed-lower-expanded shape and comprising a narrow upper portion, a slant portion and a wide lower portion, the second stage furnace being in an upper-expanded-lower-narrowed shape and comprising a wide upper portion, a slant portion and a narrow lower portion.