Experimental and numerical study of pseudo-2D circulating fluidized beds
Source abstract
Abstract
We present experimental investigations and numerical simulations of a pseudo-2D riser. Experiments were performed for various airflow rates, particle types/diameters, and particle size distributions. Pressure distributions along the wall of the riser were measured. Additional measurements from a smaller pseudo-2D riser (Kallio et al., 2009; Shah et al., 2012) were used to analyze horizontal solids volume fraction profiles. The experimental data were compared with simulation results carried out using an Euler-Euler approach. A mesh sensitivity study was conducted for numerical simulations and effects associated with simplifying real 3D geometry to a 2D model were examined. In addition, the effect of using an algebraic equation to represent the granular temperature versus a full partial differential equation also was examined for numerical simulations. Results showed small but significant near-wall sensitivity of the flow variables to mesh size. Substantial differences in mean pressure, solids distribution, and solid velocities were obtained, when 2D and 3D simulation results were compared. Finally, applying the simplified granular temperature equation for turbulent fluidization and for dilute-phase transport can lead to incorrect predictions in models.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Granular flow and fluidized beds · Particle Dynamics in Fluid Flows · Cyclone Separators and Fluid Dynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (33)
Show source-provided references
1. Computational fluid dynamics of a circulating fluidized bed under various fluidization conditions10.1016/j.ces.2007.11.020 ↗
2. Computational fluid dynamics of high density circulating fluidized bed riser: Study of modeling parameters10.1016/j.powtec.2007.09.010 ↗
3. 2011
4. Simulation of particles and gas flow behavior in the riser section of a circulating fluidized bed using the kinetic theory approach for the particulate phase10.1016/S0032-5910(99)00302-2 ↗
5. Flow regime diagrams for gas–solid fluidization and upward transport10.1016/0301-9322(95)00037-X ↗
6. Some modeling and numerical aspects of the two-fluid simulation of the gas-solids flow in a CFB riser10.1590/S0104-66322006000400006 ↗
7. Kinetic theory based computation of PSRI riser: Part I—Estimate of mass transfer coefficient10.1016/j.ces.2008.11.010 ↗
8. Kinetic theory based computation of PSRI riser: Part II—Computation of mass transfer coefficient with chemical reaction10.1016/j.ces.2008.11.006 ↗
9. A fine resolution parametric study on the numerical simulation of gas–solid flows in a periodic riser section10.1016/j.powtec.2010.08.072 ↗
10. The generality of the standard 2D TFM approach in predicting bubbling fluidized bed hydrodynamics10.1016/j.powtec.2012.11.041 ↗
11. Grid independence behavior of fluidized bed reactor simulations using the two fluid model: Effect of particle size10.1016/j.powtec.2014.08.055 ↗
12. Dullien · 1992
13. Gidaspow · 1994
14. Gidaspow, D., Bezburuah, R., & Ding, J. (1992). Hydrodynamics of circulating fluidized beds, kinetic theory approach. In fluidization VII, Proceedings of the 7th engineering foundation conference on fluidization. pp. 75–82.
15. CFD-simulation of a circulating fluidized bed riser10.1016/j.partic.2009.04.005 ↗
16. Hydrodynamic simulation of gas-solid flow in a riser using kinetic theory of granular flow10.1016/S1385-8947(03)00062-7 ↗
17. Frictional-collisional constitutive relations for granular materials, with application to plane shearing10.1017/S0022112087000570 ↗
18. Kallio, S., Airaksinen, J., Gulden, M., Hermanson, A., Peltola, J., & Ritvanen, J., et al. (2009). Experimental and numerical study of hydrodynamics in a circulating fluidized bed. Proceedings of Finnish–Swedish flame days, electronic version.
19. Modeling of the time-averaged gas-solid drag force in a fluidized bed based on results from transient 2D Eulerian–Eulerian simulations10.1016/j.powtec.2014.04.045 ↗
20. Numerical simulation of flow behavior of particles and clusters in riser using two granular temperatures10.1016/j.powtec.2007.09.003 ↗
21. Kinetic theories for granular flow: Inelastic particles in Couette flow and slightly inelastic particles in a general flow field10.1017/S0022112084000586 ↗
22. A three-dimensional model frame for modelling combustion and gasification in circulating fluidized bed furnaces10.1515/1542-6580.2571 ↗
23. Instability in the evolution equations describing incompressible granular flow10.1016/0022-0396(87)90038-6 ↗
24. Space averaging on a gas-solid drag model for numerical simulations of a CFB riser10.1016/j.powtec.2011.11.053 ↗
25. Computer simulation of bubbles in a fluidized bed
26. Syamlal, M., Rogers, W., & O’Brien, T. J. (1993). MFIX documentation: Theory guide. National Energy Technology Laboratory, Department of Energy, Technical Note DOE/METC-95/1013 and NTIS/DE95000031.10.2172/10145548 ↗
27. Eulerian simulations of bubbling behavior in gas–solid fluidized beds10.1016/S0098-1354(98)00068-4 ↗
28. Comparative analysis of CFD models of dense gas-solid systems10.1002/aic.690470510 ↗
29. Experiment and CFD simulation of gas solid flow in the riser of dense fluidized bed at high gas velocity10.1016/j.powtec.2009.12.016 ↗
30. Reactive gas–solids flows in large volumes—3D modeling of industrial circulating fluidized bed combustors10.1016/j.partic.2009.08.001 ↗
31. Effects of using two- versus three-dimensional computational modeling of fluidized beds Part I, hydrodynamics10.1016/j.powtec.2007.07.005 ↗
32. Virtual experimentation through 3D full-loop simulation of a circulating fluidized bed10.1016/j.partic.2008.07.013 ↗
33. 3D CFD simulation of hydrodynamics of a 150MWe circulating fluidized bed boiler10.1016/j.cej.2010.06.033 ↗