Homogeneous and bubbling fluidization regimes in DEM–CFD simulations: Hydrodynamic stability of gas and liquid fluidized beds

2007 ◽  
Vol 62 (1-2) ◽  
pp. 116-130 ◽  
Author(s):  
Alberto Di Renzo ◽  
Francesco Paolo Di Maio
Keyword(s):  
Hydrodynamic Stability ◽  
Fluidized Beds ◽  
Cfd Simulations

Comparison of heat transfer models in DEM-CFD simulations of fluidized beds with an immersed probe

2009 ◽  
Vol 193 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Francesco Paolo Di Maio ◽  
Alberto Di Renzo ◽  
Daniela Trevisan
Keyword(s):  
Heat Transfer ◽  
Fluidized Beds ◽  
Cfd Simulations ◽  
Transfer Models

CFD Simulations of bubbling/collapsing fluidized beds for three Geldart Groups

AIChE Journal ◽  
2003 ◽  
Vol 49 (4) ◽  
pp. 844-858 ◽  
Author(s):  
Susan J. Gelderbloom ◽  
Dimitri Gidaspow ◽  
Robert W. Lyczkowski
Keyword(s):  
Fluidized Beds ◽  
Cfd Simulations ◽  
Geldart Groups

scholarly journals Numerical Simulation Comparison of Two Reactor Configurations for Chemical Looping Combustion and Chemical Looping With Oxygen Uncoupling

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Matthew A. Hamilton ◽  
Kevin J. Whitty ◽  
JoAnn S. Lighty
Keyword(s):  
Carbon Capture ◽  
Fluidized Beds ◽  
Fluid Dynamic ◽  
Oxygen Carrier ◽  
Circulation Rate ◽  
Chemical Looping ◽  
Cfd Simulations ◽  
Choked Flow ◽  
Solids Circulation Rate ◽  
Particle Velocities

Chemical looping with oxygen uncoupling (CLOU) is a carbon capture technology that utilizes a metal oxide as an oxygen carrier to selectively separate oxygen from air and release gaseous O2 into a reactor where fuel, such as coal, is combusted. Previous research has addressed reactor design for CLOU systems, but little direct comparison between different reactor designs has been performed. This study utilizes Barracuda-VR® for comparison of two system configurations, one uses circulating fluidized beds (CFB) for both the air reactor (AR) and fuel reactor (FR) and another uses bubbling fluidized beds for both reactors. Initial validation of experimental and computational fluid dynamic (CFD) simulations was performed to show that basic trends are captured with the CFD code. The CFD simulations were then used to perform comparison of key performance parameters such as solids circulation rate and reactor residence time, pressure profiles in the reactors and loopseals, and particle velocities in different locations of the reactor as functions of total solids inventory and reactor gas flows. Using these simulation results, it was determined that the dual CFB system had larger range for solids circulation rate before choked flow was obtained. Both systems had similar particle velocities for the bottom 80% of particle mass, but the bubbling bed (BB) obtained higher particle velocities as compared to the circulating fluidized-bed FR, due to the transport riser. As a system, the results showed that the dual CFB configuration allowed better control over the range of parameters tested.

2D and 3D CFD Simulations of Bubbling Fluidized Beds Using Eulerian-Eulerian Models

2003 ◽  
Vol 1 (1) ◽  
Author(s):  
Luca Cammarata ◽  
Paola Lettieri ◽  
Giorgio D. M. Micale ◽  
Derek Colman
Keyword(s):  
Kinetic Model ◽  
Bubble Size ◽  
Fluidized Beds ◽  
Numerical Procedure ◽  
Cfd Simulations ◽  
3D Simulations ◽  
Gas Fluidized Beds ◽  
Group B ◽  
Particle Bed ◽  
2D And 3D

This paper reports on CFD simulations of freely bubbling gas fluidized beds using CFX-4, a commercial code developed by CFX Ltd. (formerly AEA Technology). Two Eulerian-Eulerian modelling approaches, the granular kinetic model and the particle-bed model (Gibilaro, 2001), have been investigated. The particle bed model has been recently implemented in CFX-4 for 2D simulations and a numerical procedure was developed to allow for a tight control of the fluid-bed voidage at maximum packing during the simulations, see Lettieri et al. (2003). The work has now been extended to 3D simulations and qualitative and quantitative results are presented in this paper for both the 2D and 3D simulations of the bubbling fluidization of a Geldart Group B material. Results on bed expansion, bubble size and bubble hold-up are reported. In particular, simulated bubble size is compared with predictions given by the Darton et al. (1977) equation at different bed heights. The paper shows that the bubble size predicted by both the granular kinetic model and the particle-bed model is in good agreement with the Darton's equation.

CFD simulations of tapered bubbling/turbulent fluidized beds with/without gas distributor based on the structure-based drag model

2019 ◽  
Vol 202 ◽  
pp. 157-168 ◽  
Author(s):  
Zheng Zou ◽  
Wenming Liu ◽  
Dong Yan ◽  
Zhaohui Xie ◽  
Hongzhong Li ◽  
...  
Keyword(s):  
Fluidized Beds ◽  
Cfd Simulations ◽  
Drag Model ◽  
Gas Distributor
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