Material specific drying kinetics in fluidized bed drying under mechanical vibration using the reaction engineering approach

Lehmann, Soeren E.; Oesau, Tobias; Jongsma, Alfred; Innings, Fredrik; Heinrich, Stefan

doi:10.1016/j.apt.2020.11.006

Cited by 11 publications

(13 citation statements)

References 37 publications

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“…Several modeling approaches for the drying kinetics of fluidized bed dryers have been proposed and applied in the literature. Kemp and Oakley [24] and Lehmann et al [25] reviewed these modeling approaches. Two approaches have been identified as most suitable for the application in flowsheet simulation: the Normalized Characteristic Drying Curve (NCDC) and the Reaction Engineering Approach (REA) [25], of which the NCDC is used more often.…”

Section: Modeling Of Dying Kineticsmentioning

confidence: 99%

“…Kemp and Oakley [24] and Lehmann et al [25] reviewed these modeling approaches. Two approaches have been identified as most suitable for the application in flowsheet simulation: the Normalized Characteristic Drying Curve (NCDC) and the Reaction Engineering Approach (REA) [25], of which the NCDC is used more often. It was first introduced by van Meel [26] and was refined, adjusted and applied in fluidized bed drying models by several researchers [16][17][18]27,28].…”

Section: Modeling Of Dying Kineticsmentioning

confidence: 99%

“…For more details regarding the REA and its determination, the reader is referred to [31,33,34]. A detailed study of the suitability of the REA for its application in fluidized bed drying was conducted in [25].…”

Section: Modeling Of Dying Kineticsmentioning

confidence: 99%

“…Fluidized bed drying experiments with non-cohesive particles of Geldart groups A, B and D showed that mechanical vibration reduced the minimum fluidization velocity (u mf ). Once the bed was fluidized, no further effects on either hydrodynamics or drying kinetics were evident [25]. Due to the lack of robust correlations in the literature to predict (u mf ) in dependence of vibration and particle moisture content, experimental values for (u mf ) from [25] are used as input parameters.…”

Section: Hydrodynamics Modelmentioning

confidence: 99%

“…The intraparticle resistances in the second drying period are considered by using normalized, material specific drying curves (ν) (see Equation (A2)). The drying curves were derived for the investigated materials in a previous publication, using the inverted REA [25].…”

Section: Thermodynamic Modelmentioning

confidence: 99%

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Modeling and Flowsheet Simulation of Vibrated Fluidized Bed Dryers

Lehmann

Buchholz

Jongsma³

et al. 2020

Processes

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Drying in fluidized beds is an important step in the production of powdered materials. Especially in the food and pharmaceutical industry, fluidized bed dryers are often vibrated to improve the drying process. In the current work, a continuous fluidized bed drying model is implemented in the novel, open-source flowsheet simulation framework Dyssol. The new model accounts for the hydrodynamic characteristics of all Geldart groups as well as the impact of mechanical vibration on the drying process. Distributed particle properties are considered by the model. Comprehensive validation of the model was conducted for a wide range of process parameters, different materials, dryer geometries and dimensions as well as the impact of vibration. Particle properties are predicted accurately and represent the broad experimental data well. A sensitivity analysis of the model confirmed grid independence and the validity of underlying model assumptions.

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Section: Modeling Of Dying Kineticsmentioning

confidence: 99%