Effect of Superficial Gas Velocity on the Solid Temperature Distribution in Gas Fluidized Beds with Heat Production

Mohammad Banaei; Jeroen Jegers; Martin van Sint Annaland; Johannes A M Kuipers; Niels G Deen

doi:10.1021/acs.iecr.7b00338

Effect of Superficial Gas Velocity on the Solid Temperature Distribution in Gas Fluidized Beds with Heat Production

Ind Eng Chem Res. 2017 Aug 2;56(30):8729-8737. doi: 10.1021/acs.iecr.7b00338. Epub 2017 Jul 11.

Authors

Mohammad Banaei^{1

2}, Jeroen Jegers¹, Martin van Sint Annaland^{1

2}, Johannes A M Kuipers^{1

2}, Niels G Deen^{2

1}

Affiliations

¹ Multiphase Reactors Group, Department of Chemical Engineering & Chemistry, and Multiphase and Reactive Flows Group, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
² Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands.

Abstract

The hydrodynamics and heat transfer of cylindrical gas-solid fluidized beds for polyolefin production was investigated with the two-fluid model (TFM) based on the kinetic theory of granular flow (KTGF). It was found that the fluidized bed becomes more isothermal with increasing superficial gas velocity. This is mainly due to the increase of solids circulation and improvement in gas solid contact. It was also found that the average Nusselt number weakly depends on the gas velocity. The TFM results were qualitatively compared with simulation results of computational fluid dynamics combined with the discrete element model (CFD-DEM). The TFM results were in very good agreement with the CFD-DEM outcomes, so the TFM can be a reliable source for further investigations of fluidized beds especially large lab-scale reactors.