Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed
The hydrodynamics of circulating fluidized beds (CFBs) is a complex phenomenon that can drastically vary depending on operational setup and geometrical configuration. A research of the literature shows that studies for the prediction of key variables in CFB systems operating at high temperature stil...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Chemical Engineering |
| Online Access: | http://dx.doi.org/10.1155/2012/786982 |
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| author | Maximilian J. Hodapp Jhon J. Ramirez-Behainne Milton Mori Leonardo Goldstein |
| author_facet | Maximilian J. Hodapp Jhon J. Ramirez-Behainne Milton Mori Leonardo Goldstein |
| author_sort | Maximilian J. Hodapp |
| collection | DOAJ |
| description | The hydrodynamics of circulating fluidized beds (CFBs) is a complex phenomenon that can drastically vary depending on operational setup and geometrical configuration. A research of the literature shows that studies for the prediction of key variables in CFB systems operating at high temperature still need to be implemented aiming at applications in energy conversion, such as combustion, gasification, or fast pyrolysis of solid fuels. In this work the computational fluid dynamics (CFD) technique was used for modeling and simulation of the hydrodynamics of a preheating gas-solid flow in a cylindrical bed section. For the CFD simulations, the two-fluid approach was used to represent the gas-solid flow with the k-epsilon turbulence model being applied for the gas phase and the kinetic theory of granular flow (KTGF) for the properties of the dispersed phase. The information obtained from a semiempirical model was used to implement the initial condition of the simulation. The CFD results were in accordance with experimental data obtained from a bench-scale CFB system and from predictions of the semiempirical model. The initial condition applied in this work was shown to be a viable alternative to a more common constant solid mass flux boundary condition. |
| format | Article |
| id | doaj-art-45d69ba197304a9fbf5a3d594c50fdfb |
| institution | Kabale University |
| issn | 1687-806X 1687-8078 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Chemical Engineering |
| spelling | doaj-art-45d69ba197304a9fbf5a3d594c50fdfb2025-02-03T01:00:31ZengWileyInternational Journal of Chemical Engineering1687-806X1687-80782012-01-01201210.1155/2012/786982786982Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized BedMaximilian J. Hodapp0Jhon J. Ramirez-Behainne1Milton Mori2Leonardo Goldstein3School of Chemical Engineering, University of Campinas, 500 Albert Einstein Avenue, Campinas 13083-970, SP, BrazilDepartment of Mechanical Engineering, Federal University of Technology of Parana, Monteiro Lobato Avenue, 84016-210 Ponta Grossa, PR, BrazilSchool of Chemical Engineering, University of Campinas, 500 Albert Einstein Avenue, Campinas 13083-970, SP, BrazilFaculty of Mechanical Engineering, University of Campinas, 200 Mendeleyev Avenue, Campinas, 13083-970, SP, BrazilThe hydrodynamics of circulating fluidized beds (CFBs) is a complex phenomenon that can drastically vary depending on operational setup and geometrical configuration. A research of the literature shows that studies for the prediction of key variables in CFB systems operating at high temperature still need to be implemented aiming at applications in energy conversion, such as combustion, gasification, or fast pyrolysis of solid fuels. In this work the computational fluid dynamics (CFD) technique was used for modeling and simulation of the hydrodynamics of a preheating gas-solid flow in a cylindrical bed section. For the CFD simulations, the two-fluid approach was used to represent the gas-solid flow with the k-epsilon turbulence model being applied for the gas phase and the kinetic theory of granular flow (KTGF) for the properties of the dispersed phase. The information obtained from a semiempirical model was used to implement the initial condition of the simulation. The CFD results were in accordance with experimental data obtained from a bench-scale CFB system and from predictions of the semiempirical model. The initial condition applied in this work was shown to be a viable alternative to a more common constant solid mass flux boundary condition.http://dx.doi.org/10.1155/2012/786982 |
| spellingShingle | Maximilian J. Hodapp Jhon J. Ramirez-Behainne Milton Mori Leonardo Goldstein Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed International Journal of Chemical Engineering |
| title | Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed |
| title_full | Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed |
| title_fullStr | Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed |
| title_full_unstemmed | Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed |
| title_short | Numerical Studies of the Gas-Solid Hydrodynamics at High Temperature in the Riser of a Bench-Scale Circulating Fluidized Bed |
| title_sort | numerical studies of the gas solid hydrodynamics at high temperature in the riser of a bench scale circulating fluidized bed |
| url | http://dx.doi.org/10.1155/2012/786982 |
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