Reaction behavior in packed bed considering bed structure and reaction properties of particles

Ryo Shibasaki, Shungo Natsui, Tatsuya Kon, Shigeru Ueda, Ryo Inoue, Tatsuro Ariyama

Research output: Contribution to journalArticlepeer-review

Abstract

To decrease the reducing agent ratio in the blast furnace, various measures such as mixed charging are being pursued. Coke mixed charging is considered to improve permeability in the cohesive zone and the reducing behavior of ore particles. Conventionally, these researches were frequently carried out with a small packed bed. However, the information obtained by these experiments was based on a macroscopic analysis. In the present research, a DEM-CFD model developed by the authors was applied to precisely analyze reaction behavior under various packed bed structures, such as that with coke mixing. Moreover, the effect of high reactivity coke on the reduction rate of ore was examined using this model. According to the results, coke mixed charging has little influence on the reduction rate. When high reactivity coke was charged to the ore layer, the particle temperature decreased due to the endothermic reaction by high reactivity coke. Accordingly, the reduction rate of the ore particles was suppressed as a result of the temperature change. This phenomenon was relatively noticeable in the packed bed structure with high reactivity coke set up in the lower part.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume99
Issue number6
DOIs
Publication statusPublished - 2013

Keywords

  • Blast furnace
  • Coke mixed charge
  • DEM-CFD
  • High reactivity coke
  • Mathematical model
  • Packed bed

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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