Model Analysis of Iron Ore Reduction in a Circulating Fluidized Bed

Yoshiei Katou, Hiroshi Itaya

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A reduction reaction model of fine iron ore in a circulating fluidized bed, which involved inner and outer circulation of powder, was developed to obtain scale-up information and to examine the effects of operating factors on reduction degree. Differential equations of mass balance were solved numerically under a one-interface unreacted core model by the Runge-Kutta-Gill method. Calculated curves of reduction degree vs. reduction temperature, consumed gas volume per supplied iron ore, and mean residence time agreed with experimental ones. Reduction degree decreased with increasing input gas oxidation degree. However, the differential changed discontinuously depending on whether reduced iron oxides or metallic iron were in equilibrium with the gas composition in the circulating fluidized bed. This model enabled us to predict gas oxidation degree according to the targeted reduction degree of iron ore.

Original languageEnglish
Pages (from-to)667-672
Number of pages6
JournalKagaku Kogaku Ronbunshu
Volume29
Issue number5
Publication statusPublished - Sep 2003
Externally publishedYes

Fingerprint

Iron ore reduction
Fluidized beds
Iron ores
Gases
Oxidation
Runge Kutta methods
Iron oxides
Powders
Interfaces (computer)
Differential equations
Iron
Chemical analysis

Keywords

  • Circulating fluidized bed
  • Iron ore
  • Oxidation degree
  • Reduction degree
  • Reduction temperature

ASJC Scopus subject areas

  • Materials Science (miscellaneous)

Cite this

Model Analysis of Iron Ore Reduction in a Circulating Fluidized Bed. / Katou, Yoshiei; Itaya, Hiroshi.

In: Kagaku Kogaku Ronbunshu, Vol. 29, No. 5, 09.2003, p. 667-672.

Research output: Contribution to journalArticle

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