Gas-powder flow and powder accumulation in a packed bed: I. Experimental study

X. F. Dong, D. Pinson, S. J. Zhang, A. B. Yu, P. Zulli

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Gas-powder flow in a slot type packed bed is experimentally studied in order to understand the flow and accumulation behaviour of powder in systems like an ironmaking blast furnace (BF). A variety of variables including gas flow rate, powder flow rate and packing properties are considered. It is found that a clear and stable accumulation region, in which the voids among packed particles are fully filled with powder, can form in the low gas-powder velocity zone at the bottom of the bed. The accumulation region is stable and shows strong hysteresis. The distribution of softening-melting layers in the blast furnace known as the cohesive zone (CZ) is modelled by inserting solid blocks into the bed. The results indicate that the inverse-V cohesive zone shape leads to low powder accumulation within the CZ and at the corner of the bed.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalPowder Technology
Issue number1
Publication statusPublished - 23 Nov 2004
Externally publishedYes


  • Blast furnace
  • Gas-powder flow
  • Packed beds
  • Physical modelling
  • Powder accumulation

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