Numerical study of coal particle cluster combustion under quiescent conditions

Shuyan Wang, Huilin Lu, Yunhua Zhao, Reza Mostofi, Ho Young Kim, Lijie Yin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Behavior of ignition and combustion of coal particle cluster under a quiescent condition was numerically simulated by solving balance equations of mass and enthalpy with combustion kinetic models of volatiles and char. Two-flame structure, one flame penetrating into the cluster and the other moving out of the cluster, was predicted during the combustion of coal particle cluster. Effects of radiative heat transfer, group number, ambient temperature, coal particle size, and oxygen concentration on ignition and combustion of coal particle clusters were also analyzed. Simulations indicated that the gas volume fraction of coal particle cluster increases with time after devolatilization. Gas velocity passing through the cluster surface varied significantly at volatile liberation. The ignition time delay was reduced with the increase of ambient temperature. The cluster devolatilization rate and char burning rate increased while the ignition time delay decreased with the increase of ambient oxygen concentration.

Original languageEnglish
Pages (from-to)4336-4347
Number of pages12
JournalChemical Engineering Science
Volume62
Issue number16
DOIs
Publication statusPublished - 2007 Aug 1

Keywords

  • Coal cluster
  • Group combustion
  • Ignition

ASJC Scopus subject areas

  • Chemical Engineering(all)

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