A hydrodynamic model of a circulating fluidised bed with low-density particles

Authors

  • Qi Miao,

    1. Particle Technology Research Centre, University of Western Ontario, London, Ontario, Canada N6A 5B9
    Search for more papers by this author
  • Jesse Zhu,

    Corresponding author
    1. Particle Technology Research Centre, University of Western Ontario, London, Ontario, Canada N6A 5B9
    • Particle Technology Research Centre, University of Western Ontario, London, Ontario, Canada N6A 5B9.
    Search for more papers by this author
  • Shahzad Barghi,

    1. Particle Technology Research Centre, University of Western Ontario, London, Ontario, Canada N6A 5B9
    Search for more papers by this author
  • Chuangzhi Wu,

    1. CAS Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Search for more papers by this author
  • Xiuli Yin,

    1. CAS Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Search for more papers by this author
  • Zhaoqiu Zhou

    1. CAS Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    Search for more papers by this author

Abstract

In this study, a two-dimensional mathematical model was developed considering the hydrodynamic behaviour of a circulating fluidised bed biomass gasifier (CFBBG), which is also applicable for other low-density particles. In the modelling, the CFB riser was divided into two regions: a dense region at the bottom and a dilute region at the top of the riser. Kunii and Levenspiel's [Kunii and Levenspiel, Powder Technol. 61, 193-206 (1990)] model was adopted to express the vertical solids distribution with some other assumptions. Radial distributions of bed voidage were taken into account in the upper zone by using Zhang et al.'s [Zhang et al., Chem. Eng. Sci. 46(12), 3045-3052 (1991)] correlation. For model validation purposes, a cold model CFB was employed, in which sawdust was transported with air as the fluidising agent. The column is 10 m in height and 280 mm in diameter, and is equipped with pressure transducers to measure axial pressure profile and with a reflective optical fibre probe to measure local solids holdup. A satisfactory agreement between the model predictions and experimental data was found. © 2011 Canadian Society for Chemical Engineering

Ancillary