The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
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May 13-17, 2007
When two-fluid modeling is used to predict riser flows there have been difficulties in predicting the solids hold up in risers represented by the correct pressure drop profile. A way of encountering this inherent problem in current Eulerian-Eulerian CFD modeling is to approximate the actual particle size distribution by using more particle phases instead of the current practice of using one mean diameter. For the lab-scale CFB investigated, CFD simulations show that a mal-distribution occurs in the CFB; the larger particles are retained in the riser, whereas the intermediate and small particles are distributed both in the return leg and the riser. Simulations using an altered particle size distribution, i.e. a larger amount of large particles, show significant improvements in the pressure profile in the bottom part of the riser.
Kim G. Hansen, Tron Solberg, and Bjorn H. Hjertager, "A Computational Study of the Distribution of Particles in a Lab-Scale CFB Boiler" in "The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering", Franco Berruti, The University of Western Ontario, London, Canada; Xiaotao (Tony) Bi, The University of British Columbia, Vancouver, Canada; Todd Pugsley, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Eds, ECI Symposium Series, (2007). http://dc.engconfintl.org/fluidization_xii/15