Interparticle forces in high temperature fluidization of geldart a particles--颗粒学报PARTICUOLOGY

Cui, H., & Chaouki, J. (2004). Interparticle forces in high temperature fluidization of geldart a particles. China Particuology, 2(3), 113-118. https://doi.org/10.1016/S1672-2515(07)60035-9

Interparticle forces in high temperature fluidization of geldart a particles

Heping Cui, Jamal Chaouki ^*

Biopro Research Centre, Department of Chemical Engineering, Ecole Polytechnique de Montreal, C.P. 6079, succ. Centre-ville, Montreal, Quebec, Canada H3C 3A7

10.1016/S1672-2515(07)60035-9

Volume 2, Issue 3, June 2004, Pages 113-118

Received 5 April 2004, Accepted 20 May 2004, Available online 27 November 2007.

E-mail: jamal.chaouki@polymtl.ca

Highlights

Abstract

Previous reports and current studies show that fluidization of some Geldart A particles is enhanced by increasing bed temperature. Both the averaged local particle concentration and the particle concentration in the dense phase decrease with increasing bed temperature, at constant superficial gas velocities. However, conventional models fail to predict these changes, because the role of interparticle forces is usually neglected at different bed temperatures. Here, the interparticle forces are analyzed to explore the mechanism of gas-solid fluidization at high temperatures. Indeed, as the temperature increases, the interparticle attractive forces decrease while the interparticle repulsive forces increase. Consequently, fluidization behaviors of some Geldart A particles seem to increasingly shift from typical Geldart A towards B with increasing temperature.

Graphical abstract

Keywords

fluidization; gas-solid flow structure; high temperature; interparticle forces

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