Analysis of void structure in deforming packed bed of mono-dispersed spherical particles

Hiroshi Nogami, Takuto Yamawaki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The void structure in the deforming packed bed like cohesive zone of blast furnace was discussed. The examined packed bed consisted of mono-dispersed spherical particles and was numerically prepared by using the discrete element method. From the obtained packing particle structure, the characteristics of the void space, namely voidage, surface area, hydraulic radius, flow path network structure, width and length of the flow path, were extracted. The actual hydraulic radius deviated from the one calculated from the bed shrinkage with the bed deformation, and this deviation resulted the large difference in the pressure drop in the packed bed. The flow path (void) network was successfully extracted from the particle packing structure. Additionally, distributions of the path width and length were obtained. The choking of flow path with bed shrinkage can be quantitatively visualized. In the softening ore particle bed with nut coke mixing, the flow path structures around ore and nut coke particles showed different behavior. With the obtained characteristics of the void structure, the variations of the pressure drops in the reduction test under loading and in the softening ore layer with coke mixing can be explained.

Original languageEnglish
Pages (from-to)1560-1569
Number of pages10
JournalIsij International
Volume60
Issue number7
DOIs
Publication statusPublished - 2020

Keywords

  • Blast furnace
  • Cohesive zone
  • Deforming packed bed
  • Hydraulic radius
  • Nut coke mixing
  • Void network structure

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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