An experimental study on the effect of metallic iron particles on strength factors of coke after CO2 gasification reaction

Yoshiaki Yamazaki, Kenichi Hiraki, Tetsuya Kanai, Xiaoqing Zhang, Masakazu Shoji, Hideyuki Aoki, Takatoshi Miura

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

Abstract

In order to prevent the pulverization and the fracture of coke lump in blast furnace, control of degradation part (reaction mechanism) in coke lump and that of the embrittlement behavior are significant. Addition of catalyst particle is an effective and a simple method for advancement of the CO 2 gasification reactivity and control method for reaction mechanism. In this study, the effect of iron particles on coke-matrix state after gasification reaction is investigated experimentally. Coke-matrix vanishing is evaluated by spatial distribution of lump porosity and microscopic observation. Elastic modulus of coke-matrix is evaluated by nano-indentation method. Coke lumps with and without iron-particles (ferrous coke and formed coke, respectively) were used. These coke lumps were gasified by CO 2-containing gas. Reaction temperature was set at 1173 K. Reaction gas compositions were set at 100/0 and 50/50 in ratio of CO2/CO. In each reaction gas composition, in ferrous coke, a decrease in the elastic modulus of coke-matrix with progress of gasification is smaller than that in formed coke and coke-matrix vanishing occurred. It is suggested that the iron particle promotes gasification reaction of coke-matrix selectively around itself (and coke-matrix in that part is rapidly vanished). It is also suggested that this reaction mechanism maintains elastic modulus of coke-matrix because of the local rapid gasification reaction around the iron particle.

Original languageEnglish
Title of host publication27th Annual International Pittsburgh Coal Conference 2010, PCC 2010
Pages1932-1939
Number of pages8
Publication statusPublished - 2010 Dec 1
Event27th Annual International Pittsburgh Coal Conference 2010, PCC 2010 - Istanbul, Turkey
Duration: 2010 Oct 11 → …

Publication series

Name27th Annual International Pittsburgh Coal Conference 2010, PCC 2010
Volume3

Other

Other27th Annual International Pittsburgh Coal Conference 2010, PCC 2010
Country/TerritoryTurkey
CityIstanbul
Period10/10/11 → …

Keywords

  • Coke gasification
  • Coke strength
  • Ferrous coke
  • Matrix stiffness
  • Porosity

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

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