About This Presentation
Sina Tebianian – IFP Energies Nouvelles
Summary. A particular flow regime occasionally observed when fluidizing Geldart B particles in small scale units is slugging. This flow regime, characterized by high pressure fluctuations and big bubbles that can cover the entire section of the fluidizing column (square-nosed slugs), may result in difficulty of extrapolation of the hydrodynamic results obtained for small units into larger scales. CFD models represent a potential tool for the design of gas-fluidized beds. Despite the efforts of the scientific community, the ability of these models in predicting the hydrodynamic behavior of these multiphase systems is still limited. Robust and reliable CFD tools that can predict the hydrodynamics of group B particles slugging in lab or pilot scale units is extremely useful for beforehand definition of the operating conditions and geometry that can assure cold flow model experimentation reproducing the same hydrodynamics of large scale reactors. In this work, two different commercial CFD tools have been compared in their ability of predicting hydrodynamic features of slugging gas-solid fluidized beds. The study is of special interest to chemical looping combustion process that employs Geldart B particles but also to fluidized bed combustion or gasification processes.
About the speaker. Dr. Sina Tebianian has obtained his PhD in fluidization at University of British Columbia under supervision of Prof. John Grace. Currently he is a research engineer at IFPEN responsible of design and scale-up of fluidization technologies such as Catalytic fast pyrolysis and Chemical Looping Combustion.