Title:
【発明の名称】微粉末鉄鉱石還元用流動床型還元システム
Document Type and Number:
Japanese Patent JP3185059
Kind Code:
B2
Abstract:
A fluidized bed reducing system for reducing a fine iron ore is disclosed, in which the structure of the fluidized bed reducing furnace is improved such that the coarse iron ore particles are distributed in the lower portion of the fluidized bed within the furnace and the fine iron ore particles are distributed in the upper portion of the fluidized bed. Thus, the average residence times of the particles in the furnace are adjusted differently for different ore sizes, so that the reducing efficiency can be improved, and that the residence time of the reducing gas in the furnace can be extended, thereby improving the degree of gas utilization. The fluidized bed reducing system for reducing a fine iron ore includes: an upper iron ore outlet for discharging fine iron ore particles; a lower iron ore outlet for discharging coarse iron ore particles; a gas distributor installed in a lower portion of a reducing furnace; a gas inlet formed on a lower portion of the reducing furnace for introducing a reducing gas; an iron ore inlet for supplying an iron ore of wide particle size distribution; a circulating duct connected to an upper portion of the reducing furnace for discharging extremely fine iron ore particles together with the reducing gas; a particle capturing device an extremely fine iron ore recycling duct. The fluidized bed reducing furnace includes a cylindrical upper portion and a tapered lower portion, the tapered portion being in a wide-upper-narrow-lower shape.
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Inventors:
Kim Youngha
Reel oc
Kim Hang Go
Reel oc
Kim Hang Go
Application Number:
JP52988198A
Publication Date:
July 09, 2001
Filing Date:
December 28, 1996
Export Citation:
Assignee:
Pohang Iron and Steel CEO., LDT.
Research Institute of Industrial Science and Technology
Boest-Alpine Industry Ann Lagenbaum MGB
Research Institute of Industrial Science and Technology
Boest-Alpine Industry Ann Lagenbaum MGB
International Classes:
C21B13/00; F27B15/08; F27B15/09; (IPC1-7): C21B13/00; F27B15/08
Attorney, Agent or Firm:
Masahisa Takahashi