Modeling and flowsheet simulation of continuous fluidized bed dryers

Alaathar, Ibrahim; Hartge, Ernst‐Ulrich; Heinrich, Stefan; Werther, Joachim

doi:10.1016/j.powtec.2012.03.048

Cited by 17 publications

(18 citation statements)

References 6 publications

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“…Davidson and Harrison's two-phase model [13] was further improved and refined by Hilligardt and Werther [15], who introduced semi-empirical correlations to describe the hydrodynamics of fluidized beds of Geldart A, B and D particles. Their model has been successfully applied in the modeling of several fluidized bed processes [16][17][18][19] and has been confirmed to be accurate [20][21][22][23]. Recently, the Hilligardt and Werther model was expanded for modeling the hydrodynamic of cohesive Geldart A and C particles with and without vibration of the fluidized bed [6].…”

Section: Modeling Of Hydrodynamicsmentioning

confidence: 99%

“…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]. Furthermore, it was successfully applied in the CFD simulation of spray drying of milk [29].…”

Section: Modeling Of Dying Kineticsmentioning

confidence: 99%

“…Alaathar et al [18] and Alaathar [36] implemented a steady state flowsheet model for continuous fluidized bed drying in the framework SolidSim. The model is based on the models developed by Tsotsas [27], Groenewold and Tsotsas [16,37], Burgschweiger et al [30] and Burgschweiger and Tsotsas [17].…”

Section: Flowsheet Simulationmentioning

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 Hydrodynamicsmentioning

confidence: 99%

Section: Modeling Of Dying Kineticsmentioning

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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“…Despite the fact that most models in solids processing technology consider particle size distribution as one of the main material parameters, many of them additionally incorporate various other attributes. For example, the shape and orientation of primary particles are important in crystallization processes [1]; the size and yield strength of the colliding granules can be considered as parameters for wet granulation models [2]; the distributions of granules by porosity and saturation are important for breakage rate in some apparatuses [3]; and the moisture content of particles plays a significant role in dryers [4].…”

Section: Introductionmentioning

confidence: 99%

Application of Transformation Matrices to the Solution of Population Balance Equations

et al. 2019

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The development of algorithms and methods for modelling flowsheets in the field of granular materials has a number of challenges. The difficulties are mainly related to the inhomogeneity of solid materials, requiring a description of granular materials using distributed parameters. To overcome some of these problems, an approach with transformation matrices can be used. This allows one to quantitatively describe the material transitions between different classes in a multidimensional distributed set of parameters, making it possible to properly handle dependent distributions. This contribution proposes a new method for formulating transformation matrices using population balance equations (PBE) for agglomeration and milling processes. The finite volume method for spatial discretization and the second-order Runge–Kutta method were used to obtain the complete discretized form of the PBE and to calculate the transformation matrices. The proposed method was implemented in the flowsheet modelling framework Dyssol to demonstrate and prove its applicability. Hence, it was revealed that this new approach allows the modelling of complex processes involving materials described by several interconnected distributed parameters, correctly taking into consideration their interdependency.

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“…Here, the combination of process simulation and experimental data is necessary to optimize the process chain, to develop control strategies, or to characterize influencing parameters . In recent years, mathematical models and software environments for flowsheet simulation of chemical processes have been extended to particle technology . Although some 60 % of the chemical products are present in particulate form, only a few simulation environments, such as AspenTech or gProms, are available for simulation of particulate processes.…”

Section: Introductionmentioning

confidence: 99%

Development of a Dynamic Process Model for the Mechanical Fluid Separation in Decanter Centrifuges

et al. 2017

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A dynamic process model for the simulation of the separation process in countercurrent decanter centrifuges is presented. The numerical approach uses an interconnection of compartments to characterize the residence time distribution of the particles within the centrifuge. First, the theoretical basis of the numerical approach is described. Compared to the state-of-the-art modeling of decanter centrifuges, the proposed approach allows the simulation of the temporal filling process. The short computing time results in further advantages of the dynamic process model. The so-called real-time simulation is an opportunity for a modelbased control of the separation process. An exemplary simulation with the product limestone demonstrates the main features of the numerical approach.

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Modeling and flowsheet simulation of continuous fluidized bed dryers

Cited by 17 publications

References 6 publications

Modeling and Flowsheet Simulation of Vibrated Fluidized Bed Dryers

Modeling and Flowsheet Simulation of Vibrated Fluidized Bed Dryers

Application of Transformation Matrices to the Solution of Population Balance Equations

Development of a Dynamic Process Model for the Mechanical Fluid Separation in Decanter Centrifuges

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