The CO/CO2 product ratio for a porous char particle within an incipiently fluidized bed: A numerical study

Mark J. Biggs, Pradeep K. Agarwal

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54 Citations (Scopus)


By comparing results generated from an advanced single-particle model with those obtained from experiment, we find reaction does occur within the boundary layer of a stationary char resident within the emulsion phase of a fluidized bed, with the extent of reaction diminishing as superficial gas velocity increases. Comparison also shows that the CO-O2, C-O2 and C-CO2 reactions all affect the particle related CO/CO2 product ratio, with the influence of each varying with temperature. These observations help explain the peculiar product ratio/temperature profile recently reported by Linjewile and Agarwal (1995, Fuel 74, 5) and suggest, for the first time, a relationship between the product ratio and char particle size. The model results show that boundary layer reaction influences the heat transfer coefficient associated with a char that is burning within a fluidized bed, and that any correlations which do not explicitly account for this may only serve as an approximation.

Original languageEnglish
Pages (from-to)941-952
Number of pages12
JournalChemical Engineering Science
Issue number6
Publication statusPublished - Mar 1997


  • Char bed heat transfer coefficient
  • Finite element modeling
  • Fluidized bed combustion (FBC)
  • Particle related CO/CO product ratio
  • Single char particle combustion

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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