Simultaneously Overdeveloped Central and Peripheral Gas Flows of a Blast Furnace

DOI Web Site 5 References
  • Zhao Huatao
    Ironmaking & Environment Research Group, Institute of Research of Iron & Steel, Shasteel
  • Du Ping
    Ironmaking & Environment Research Group, Institute of Research of Iron & Steel, Shasteel
  • Ren Liqun
    Ironmaking & Environment Research Group, Institute of Research of Iron & Steel, Shasteel
  • Liu Jianbo
    Ironmaking & Environment Research Group, Institute of Research of Iron & Steel, Shasteel
  • Tang Manfa
    Hongfa Ironmaking Plant, Shasteel

Abstract

The gas flow distribution in the radial direction of the blast furnace is of vital importance for its stable and economical operation.<br>In this study, an experimental apparatus, simulating bell-less top charging, was built on a 1/15 scale of 5800 m3 blast furnace in Shasteel. Experimental results shows that the charging mode designed for the simultaneously overdeveloped central and peripheral gas flow leads to a thin coke slit in the intermediate part and a large center coke column in the model furnace. The intermediate coke slit is more thinner under higher U/Umf, larger O/C and deeper stock line with the existence of coke collapse; and in the radial direction, the largest fluctuation of gas velocity exists at the center-adjacent point, the interface of center coke column and ore layer, where the small particle size coke gets fluidized, which coincides with the analysis of above-burden temperature fluctuation and observation from top camera during blast furnace operation. In combination with the actual online operation data, it is further revealed that the burden layer with locally-narrowed coke slit at the cohesive zone hinders the smooth gas flowing, resulting in a big fluctuation of gas flow at the bosh part and an unsmooth burden descending.<br>Optimization of charging pattern was done in the cold model and applied to the 5800 m3 blast furnace. As a conclusion, optimization of coke charging mode to increase the intermediate thin part of coke layer is the most effective way to pursue the stable operation with high productivity.

Journal

  • ISIJ International

    ISIJ International 55 (10), 2064-2073, 2015

    The Iron and Steel Institute of Japan

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