Article: Comparative hydrodynamics study of fluidized bed gasifier incorporating static and rotating air distributor plates: A CFD approach
Powder technology. 2022 June, v. 405
2022
Abstract: This paper studies hydrodynamics of bubbling fluidized bed gasifier using static and rotating perforated air distributor plates. Pressure drop across the bed is calculated numerically using a static distributor plate to validate the model results with ... ...
| Abstract | This paper studies hydrodynamics of bubbling fluidized bed gasifier using static and rotating perforated air distributor plates. Pressure drop across the bed is calculated numerically using a static distributor plate to validate the model results with available experimental data. CFD results are good enough within the acceptable range of 10% difference. Dynamic mesh methodology coupled with the siding mesh technique of ANSYS FLUENT is incorporated to rotate distributor plates for specified rotational velocity using a user-defined function (UDF) hooked to the solver. Hydrodynamics study of fluidized bed with varying operational parameters using rotating plate distributor is carried out extensively. It is revealed that the impact of tangential and radial velocities on the fluidized bed due to rotation of plate is highest for lower superficial velocities, shallow initial depth, and the maximum rotational velocity of the distributor plate. The tangential and radial velocities variations with column height up to 3Uₘf showed a similar trend that changed significantly for higher superficial velocities (4Uₘf, 5Uₘf), resulting in more chaotic solids. The comparative evaluation of static and rotating distributor plates results shows an appreciable difference. The pressure drop across the bed is increased about 6–7% and minimum fluidization velocity is decreased upto 10% when compared to static plate distributor. Moreover, bed height rise is on a higher side for static plate distributors due to the dominant axial component of air velocity compared to the rotating plate distributor. It is also revealed that the pressure fluctuations within the fluidized bed are significantly reduced (88%) when using a rotating distributor plate compared with static plate distributors. |
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| Keywords | air ; fluidized beds ; hydrodynamics ; model validation ; technology |
| Language | English |
| Dates of publication | 2022-06 |
| Publishing place | Elsevier B.V. |
| Document type | Article |
| ISSN | 0032-5910 |
| DOI | 10.1016/j.powtec.2022.117500 |
| Database | NAL-Catalogue (AGRICOLA) |
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