Numerical study on pulverized biochar injection in blast furnace

Agung Tri Wijayanta, Md Saiful Alam, Koichi Nakaso, Jun Fukai, Kazuya Kunitomo, Masakata Shimizu

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The possibility of injecting pulverized biochar instead of conventional pulverized coal in blast furnace ironmaking was investigated numerically. More detailed reactions including the water-related reactions were considered here. The combustion process from the tuyere to the raceway of a blast furnace was simulated. Oak char (volatile matter wt.% dry basis, VM = 27.11 wt.%-db) provided a lower temperature than Taiheiyo coal (VM = 44.60 wt.%-db). Increasing the O2 concentration from 23 to 27 wt.% resulted in a higher combustibility of both solid fuels. However, the effect of increasing oxygen concentration was still insufficient for the Oak char at high injection rates because of its inadequate volatile content. Biochar properties become increasingly important as the injection rate increases. Compared with Oak char that provided a combustibility of 68% at an injection rate of 200 [(kg solid fuel)/(1 000 Nm3 feed gas)] and hot blast of 27 wt.% O2 concentration, Oak char 1 (VM = 32.09 wt.%-db) had a higher combustibility of 71%.

Original languageEnglish
Pages (from-to)1521-1529
Number of pages9
JournalISIJ International
Volume54
Issue number7
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • Biochar
  • Blast furnace ironmaking
  • Combustibility
  • Numerical simulation

ASJC Scopus subject areas

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

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  • Cite this

    Wijayanta, A. T., Alam, M. S., Nakaso, K., Fukai, J., Kunitomo, K., & Shimizu, M. (2014). Numerical study on pulverized biochar injection in blast furnace. ISIJ International, 54(7), 1521-1529. https://doi.org/10.2355/isijinternational.54.1521