Estimation of turbulent diffusion coefficients in a CFB on basis of transient CFD simulations

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Abstract

Turbulent diffusion of gas components (e.g., oxygen and volatile matter) and dispersion of solid fuel particles strongly affect the combustion process in a circulating fluidized bed (CFB). A deeper understanding of these mixing processes would improve our possibilities to model CFB combustion. In the present paper, fluctuation characteristics obtained as a result of transient CFD simulations of two CFBs are presented. A simple estimate of the diffusion coefficient can be determined based on the velocity fluctuations and the Lagrangian time scale. Here, the Lagrangian time scale is estimated by the Eulerian time scale, which is determined by auto-correlating time series data from a number of monitoring points
Original languageEnglish
Title of host publication21st International Conference on Fluidized Bed Combustion Proceedings Volume 2
Place of PublicationNapoli, Italia
Pages595-602
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event21st International Conference on Fluidized Bed Combustion, 21FBC - Napoli, Italy
Duration: 3 Jun 20126 Jun 2012

Conference

Conference21st International Conference on Fluidized Bed Combustion, 21FBC
Abbreviated title21FBC
CountryItaly
CityNapoli
Period3/06/126/06/12

Keywords

  • Circulating fluidized bed
  • CFD
  • time scales
  • dispersion coefficients

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  • Cite this

    Peltola, J., & Kallio, S. (2012). Estimation of turbulent diffusion coefficients in a CFB on basis of transient CFD simulations. In 21st International Conference on Fluidized Bed Combustion Proceedings Volume 2 (pp. 595-602).