Transient behaviors of flow and accumulation of fine powders in packed bed

Hiroshi Nogami, Hideki Kawai, Hiroshi Takahashi, Masataka Sugawara, Seiya Nagai, Masahiro Fukuda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Powder behavior in blast furnace is one of the important issues to maintain stable operation of the furnace. This study discussed transient flow and accumulation behaviors of fine coke powders in packed bed of coarse alumina spheres. In the experiments two phase flow of air and fine coke is introduced from the bottom of the packed column. The variation of the pressure drop along the bed axis and the amount of the powder discharged from the top of the bed were continuously measured. After certain powder feeding time, all the materials in the packed column were taken out, and the fine powders and the coarse particles were separated to determine the static hold-up, which is the amount of the fine powders accumulated in a unit volume of the packed bed. The pressure drop and the static hold-up in the bed increase with the progress of powder injection time. The flow and the accumulation behaviors can be generally classified by the diameter ratio of the fine powders to the packed coarse particles. In small diameter ratio cases, the two phase flow would approach to a steady state. Contrarily blockage would occur in large diameter ratio cases. These behaviors could be explained through a simple consideration about the packing structure of the packed bed. Additionally local blockage, in which the powder cluster locally blocked the interstice in the bed, was observed.

Original languageEnglish
Title of host publication6th International Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Including Proc. from the 42nd Ironmaking and Raw Materials Seminar, and the 13th Brazilian Symp. on Iron Ore
Pages1885-1891
Number of pages7
Publication statusPublished - 2012 Dec 1
Externally publishedYes
Event6th International Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Rio de Janeiro, Brazil
Duration: 2012 Oct 142012 Oct 18

Publication series

Name6th Int. Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Including Proceedings from the 42nd Ironmaking and Raw Materials Seminar, and the 13th Brazilian Symp. on Iron Ore
Volume3

Other

Other6th International Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012
CountryBrazil
CityRio de Janeiro
Period12/10/1412/10/18

Keywords

  • Blast furnace
  • Blockage
  • Packed bed
  • Pressure drop
  • Static hold-up
  • Transient
  • Two-phase flow

ASJC Scopus subject areas

  • Metals and Alloys

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