The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Stefan Heinrich - One of the best experts on this subject based on the ideXlab platform.
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Modeling and Flowsheet Simulation of Vibrated Fluidized Bed Dryers
Processes, 2020Co-Authors: Soeren E. Lehmann, Moritz Buchholz, Alfred Jongsma, Fredrik Innings, Stefan HeinrichAbstract: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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dyssol an open source Flowsheet Simulation framework for particulate materials
SoftwareX, 2020Co-Authors: Vasyl Skorych, Maksym Dosta, Stefan HeinrichAbstract:Abstract Dyssol is a modelling framework for the dynamic Flowsheet Simulation of processes designed for handling of particulate materials. Main distinctive features of this software are the comprehensive description of multidimensionally distributed particulate materials, the application of transformation matrices and the use of sequential-modular Simulation approach. This cross-platform system can be easily extended with new models, applied for calculation of large datasets and coupled to the external programme packages.
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A Framework for Dynamic Simulation of Interconnected Solids Processes
Dynamic Flowsheet Simulation of Solids Processes, 2020Co-Authors: Vasyl Skorych, Maksym Dosta, Moritz Buchholz, Stefan HeinrichAbstract:The application of Flowsheet models to dynamic solids processes pose significant challenges, especially regarding the handling of the inherent multidimensionality of granular material properties, like particle size, shape and porosity distributions. The novel open-source Flowsheet Simulation framework Dyssol deals with this by applying an approach based on transformation matrices, which allows for the tracking of temporal changes in the multi-dimensional distributed parameters of the granular materials. The modelling system utilizes the sequential-modular approach in combination with partitioning and tearing methods as well as the waveform relaxation method for increased modelling flexibility while offering high computational performance. Dyssol includes an extensive and expandable model library for various unit operations in process engineering, that in turn may be calculated by user-defined solver units from a distinct library. To enhance the computational performance, the user may choose from different convergence and extrapolation methods. Material properties are defined in an extendable material database. Various case studies show robust stability and high convergence rates. The application of a global optimization algorithm shows promising results for the operational parameter adjustment in case of transient system behaviour. A concept of applying artificial neural networks to extend the scope of dynamic Flowsheet Simulation systems is proposed.
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Flowsheet Simulation of solids processes current status and future trends
Advanced Powder Technology, 2020Co-Authors: Maksym Dosta, J D Litster, Stefan HeinrichAbstract:Abstract Complex manufacturing processes are nowadays applied for production of various solid products. It is very common that for production of particles with desired properties several transformation steps like drying, milling, classification, granulation, etc. should be involved. This leads to the process structures consisting of different apparatuses or transformation substeps connected with material and energy balances. Consequently, development of new processes or optimization of already existing, as well as an optimal control, is a very challenging task, which can be partially solved using numerical modelling. For the Simulation of modern production processes, the Flowsheet calculations can be effectively used. Starting from the 80 s a lot of work focused on the Flowsheet Simulation of liquid-vapor systems has been done and as result various well-established systems exist today. With respect to the solid processes the intensive research has been started much later. In this contribution we present our view about a current role of Flowsheet Simulation for modeling of particulate materials and specify the open fields which can be covered in future research.
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Dyssol—An open-source Flowsheet Simulation framework for particulate materials
SoftwareX, 2020Co-Authors: Vasyl Skorych, Maksym Dosta, Stefan HeinrichAbstract:Abstract Dyssol is a modelling framework for the dynamic Flowsheet Simulation of processes designed for handling of particulate materials. Main distinctive features of this software are the comprehensive description of multidimensionally distributed particulate materials, the application of transformation matrices and the use of sequential-modular Simulation approach. This cross-platform system can be easily extended with new models, applied for calculation of large datasets and coupled to the external programme packages.
Joachim Werther - One of the best experts on this subject based on the ideXlab platform.
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dynamic Flowsheet Simulation for chemical looping combustion of methane
International Journal of Greenhouse Gas Control, 2018Co-Authors: Johannes Haus, Stefan Heinrich, Ernst-ulrich Hartge, Joachim WertherAbstract:Abstract In a Chemical Looping Combustion system, the fuel and air reactors are strongly coupled because of chemical reactions in both and the circulation of solid oxygen carrier between them. To capture the effects inside the system, a novel dynamic Flowsheet Simulation environment for solids processes is applied to Chemical Looping Combustion of methane. Flowsheet Simulation is a tool for process analysis and optimization covering multiple process units and flows in a system. An experimental 25 kWth pilot plant is operated, and all of its process units are modeled. The modeling comprises three fluidized bed reactors, two operating in bubbling fluidized bed condition and one as a circulating fluidized bed riser. A cyclone is used for gas-solid separation after the air reactor. The loop seals ensure gas sealing between the reactors. Fluid mechanics inside the systems are modeled with empirical and semi-empirical correlations, to enable fast calculations. This approach becomes handy when long-term dynamic effects like abrasion, start-up, or shut-down procedures as well as load changes are to be modeled. Chemical reactions for a gaseous fuel and their implications on gas flows were implemented. In addition, oxidation and reduction of the solid oxygen carrier in the three reactors were part of the Simulation. To validate the Simulation results, the pilot plant was operated with methane as fuel. Gas measurements were taken after both stages of the fuel reactor. Additionally, solid samples were drawn from the hot facility to examine the oxidation state of the carrier, when fuel is introduced. A transient Simulation of plant operation over a total runtime of 40 min reveals that the solids inventories of the fluidized bed reactors in the system need only 30 s in the present case to reach a new steady state after a load change. If the oxidation and reduction reactions of the oxygen carrier are taken into account, however, this response time extends dramatically to several hundreds of seconds, which can also be seen in the experimental campaigns. The Simulation of such a system behavior requires a powerful Simulation tool for Flowsheeting, which has been found here in the dynamic Simulation framework.
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Dynamic Flowsheet Simulation of gas and solids flows in a system of coupled fluidized bed reactors for chemical looping combustion
Powder Technology, 2017Co-Authors: Johannes Haus, Stefan Heinrich, Ernst-ulrich Hartge, Joachim WertherAbstract:Abstract A novel Flowsheet Simulation environment is applied to simulate a system of interconnected fluidized bed reactors as they are used for the process of chemical looping combustion of solid fuels. Dynamic models of the main process equipment are used in order to capture dynamic behavior of hydrodynamics inside an actual system, which delivers the experimental validation data. The process itself is carried out in a pair of strongly coupled fluidized bed reactors. Furthermore, a cyclone is used for gas-solid separation and two loop seal siphons prevent gas leakages from one reactor to another. The experimental plant operated at Hamburg University of Technology, which is modeled here, comprises a circulating fluidized bed air reactor and a two-stage bubbling bed fuel reactor. Operation of the plant is carried out at ambient condition and so are the Simulations. All the mentioned process units are connected into a Flowsheet via material streams and the whole process is simulated for 750 s of runtime. Within this time, the fluidization velocity of the fuel and the air reactor are changed to mimic effects, which occur during actual operation. The Simulation was closely accompanied by experiments at the experimental facility and the results of Simulation and experiments were compared. The bed mass, solid circulation and pressure profiles were simulated with good agreement to experimental findings. Dynamic effects were captured by the Simulations and the system's response to varying the fluidization speed, that is the change of bed masses, was predicted correctly. Time scales, in which these changes occur, were in the same range for experiments and Simulations.
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modeling and Flowsheet Simulation of continuous fluidized bed dryers
Powder Technology, 2013Co-Authors: Ibrahim Alaathar, Stefan Heinrich, Ernst-ulrich Hartge, Joachim WertherAbstract:Abstract In the current paper a Simulation tool based on previous work of Burgschweiger and Tsotsas [1] is implemented within the framework of the Flowsheet Simulation program SolidSim [4]. The implementation within the Flowsheet Simulation program allows the Simulation of the drying process for many different liquids and solids. It can also simulate the drying of mixtures of different solids. The module computes the vapor loading and temperature of the out flowing gas and the moisture and temperature distribution of the solids at the outlet taking into account their residence time distribution, their particle size and their moisture distribution at the inlet. Furthermore the model has been extended by a simple approach to simulate the drying in an elongated fluidized bed dryer. After validation the model has been used to study the influence of residence time, particle size and inlet moisture distribution in addition to drying of mixture of different types of solid. For the modeling it is assumed, that there is no classification occurring within the bed. This assumption is commonly fulfilled as long as the particle size distribution is not too wide and the fluidization velocity is sufficiently high. In this case the mixing action of the bubbles is dominating the segregation tendencies.
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Application of the Flowsheet Simulation concept to fluidized bed reactor modeling. Part I: Development of a fluidized bed reactor Simulation module
Chemical Engineering and Processing: Process Intensification, 2012Co-Authors: A. Puettmann, Ernst-ulrich Hartge, Joachim WertherAbstract:Abstract In the present work a Simulation module is developed for the description of a bubbling fluidized bed reactor and for the riser reactor of a circulating fluidized bed which is suitable for use in the framework of a Flowsheet Simulation system. A population balance approach is used to determine the particle size distribution within the reactor in steady-state. The model allows to describe the individual fate of particles in terms of attrition (abrasion and shrinkage) and transport effects. The fluidized bed reactor model is one-dimensional. Models of fluid mechanics are combined with kinetic approaches for the description of the local reaction. The implementation within the framework of a Simulation package for solids processes allows for the flexible coupling of process models, e.g. of the fluidized bed reactor with one or more cyclone stages for gas cleaning or with other fluidized beds in fluidized bed systems.
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Application of the Flowsheet Simulation concept to fluidized bed reactor modeling. Part II—Application to the selective oxidation of n-butane to maleic anhydride in a riser/regenerator system
Chemical Engineering and Processing, 2011Co-Authors: A. Puettmann, Ernst-ulrich Hartge, Joachim WertherAbstract:Abstract In part I of this paper a new fluidized bed reactor module was presented for the Simulation of a bubbling fluidized bed and of the riser of a circulating fluidized bed with the Flowsheet Simulation tool SolidSim so that several process models can easily be coupled. In the present part II the newly developed fluidized reactor modules are connected to existing cyclone modules to simulate a complex coupled fluidized-bed process, the selective oxidation of n-butane to maleic anhydride in a riser–regenerator system [1] , [2] . The calculation results for a laboratory setup are found to be in good agreement with experimental data from the literature. The subsequent Simulation of an industrial scale sized plant shows that a high solids recirculation rate is needed to achieve satisfying maleic anhydride yield. The usefulness of Flowsheet Simulation is demonstrated by further process Simulation calculations with varied solids recovery systems.
Simon Halstead - One of the best experts on this subject based on the ideXlab platform.
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Flowsheet Simulation of cobalt nickel separation by solvent extraction with trihexyl tetradecyl phosphonium chloride
Industrial & Engineering Chemistry Research, 2018Co-Authors: Hongyan Chen, Megan Jobson, Andrew J Masters, Maria Gonzalezmiquel, Simon HalsteadAbstract:Solvent extraction is widely used for selective separation of metals from solutions. Ionic liquids are showing potential for this purpose. To date, little research has focused on design, operation, and optimization of solvent extraction Flowsheets using ionic liquids. This work addresses this gap in knowledge, aiming to support development, design, and optimization of such solvent extraction processes. In this work, a general Flowsheet Simulation model is developed and applied for the case of cobalt–nickel separation using ionic liquid trihexyl(tetradecyl)phosphonium chloride ([P66614]Cl). All components are treated as distributing between the two phases and are modeled using distribution coefficient models derived from published experimental data and ab initio computational results. The rate of mass transfer between the two phases is calculated using a mass transfer model. Simulation results are shown to be generally in good agreement with published experimental results.
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Flowsheet Simulation of Cobalt–Nickel Separation by Solvent Extraction with Trihexyl(tetradecyl)phosphonium Chloride
Industrial & Engineering Chemistry Research, 2018Co-Authors: Hongyan Chen, Megan Jobson, Andrew J Masters, Maria Gonzalez-miquel, Simon HalsteadAbstract:Solvent extraction is widely used for selective separation of metals from solutions. Ionic liquids are showing potential for this purpose. To date, little research has focused on design, operation, and optimization of solvent extraction Flowsheets using ionic liquids. This work addresses this gap in knowledge, aiming to support development, design, and optimization of such solvent extraction processes. In this work, a general Flowsheet Simulation model is developed and applied for the case of cobalt–nickel separation using ionic liquid trihexyl(tetradecyl)phosphonium chloride ([P66614]Cl). All components are treated as distributing between the two phases and are modeled using distribution coefficient models derived from published experimental data and ab initio computational results. The rate of mass transfer between the two phases is calculated using a mass transfer model. Simulation results are shown to be generally in good agreement with published experimental results.
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Flowsheet Simulation of Cobalt–Nickel Separation by Solvent Extraction with Trihexyl(tetradecyl)phosphonium Chloride
2018Co-Authors: Hongyan Chen, Megan Jobson, Andrew J Masters, Maria Gonzalez-miquel, Simon HalsteadAbstract:Solvent extraction is widely used for selective separation of metals from solutions. Ionic liquids are showing potential for this purpose. To date, little research has focused on design, operation, and optimization of solvent extraction Flowsheets using ionic liquids. This work addresses this gap in knowledge, aiming to support development, design, and optimization of such solvent extraction processes. In this work, a general Flowsheet Simulation model is developed and applied for the case of cobalt–nickel separation using ionic liquid trihexyl(tetradecyl)phosphonium chloride ([P66614]Cl). All components are treated as distributing between the two phases and are modeled using distribution coefficient models derived from published experimental data and ab initio computational results. The rate of mass transfer between the two phases is calculated using a mass transfer model. Simulation results are shown to be generally in good agreement with published experimental results
Hongyan Chen - One of the best experts on this subject based on the ideXlab platform.
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Application of SAFT-VRE in the Flowsheet Simulation of an Advanced PUREX Process
Industrial & Engineering Chemistry Research, 2019Co-Authors: Hongyan Chen, Megan Jobson, Andrew J Masters, Robin J Taylor, David WoodheadAbstract:SAFT-VRE is an extension of the statistical associating fluid theory for potentials of variable range (SAFT-VR) that can be used to describe the thermodynamic properties of strong-electrolyte solutions. Here the SAFT-VRE method is used in a Flowsheet Simulation code to calculate the densities of uranyl nitrate/nitric acid aqueous solutions and the activities of species that are needed for the calculation of the distribution coefficients of nitric acid and uranium in the nitric acid–30% tributyl phosphate (TBP) extraction system that is used in an advanced PUREX process for the reprocessing of spent nuclear fuels. Simulation results of both single-stage extraction experiments and of a multistage Flowsheet test showed that the SAFT-VRE method can be used in Flowsheet Simulations with reasonable accuracy, thus demonstrating for the first time that thermodynamically-based mesoscale SAFT-VRE models can be linked to the macro-scale model of the PUREX solvent extraction process.
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Flowsheet Simulation of cobalt nickel separation by solvent extraction with trihexyl tetradecyl phosphonium chloride
Industrial & Engineering Chemistry Research, 2018Co-Authors: Hongyan Chen, Megan Jobson, Andrew J Masters, Maria Gonzalezmiquel, Simon HalsteadAbstract:Solvent extraction is widely used for selective separation of metals from solutions. Ionic liquids are showing potential for this purpose. To date, little research has focused on design, operation, and optimization of solvent extraction Flowsheets using ionic liquids. This work addresses this gap in knowledge, aiming to support development, design, and optimization of such solvent extraction processes. In this work, a general Flowsheet Simulation model is developed and applied for the case of cobalt–nickel separation using ionic liquid trihexyl(tetradecyl)phosphonium chloride ([P66614]Cl). All components are treated as distributing between the two phases and are modeled using distribution coefficient models derived from published experimental data and ab initio computational results. The rate of mass transfer between the two phases is calculated using a mass transfer model. Simulation results are shown to be generally in good agreement with published experimental results.
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Flowsheet Simulation of Cobalt–Nickel Separation by Solvent Extraction with Trihexyl(tetradecyl)phosphonium Chloride
Industrial & Engineering Chemistry Research, 2018Co-Authors: Hongyan Chen, Megan Jobson, Andrew J Masters, Maria Gonzalez-miquel, Simon HalsteadAbstract:Solvent extraction is widely used for selective separation of metals from solutions. Ionic liquids are showing potential for this purpose. To date, little research has focused on design, operation, and optimization of solvent extraction Flowsheets using ionic liquids. This work addresses this gap in knowledge, aiming to support development, design, and optimization of such solvent extraction processes. In this work, a general Flowsheet Simulation model is developed and applied for the case of cobalt–nickel separation using ionic liquid trihexyl(tetradecyl)phosphonium chloride ([P66614]Cl). All components are treated as distributing between the two phases and are modeled using distribution coefficient models derived from published experimental data and ab initio computational results. The rate of mass transfer between the two phases is calculated using a mass transfer model. Simulation results are shown to be generally in good agreement with published experimental results.
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Flowsheet Simulation of Cobalt–Nickel Separation by Solvent Extraction with Trihexyl(tetradecyl)phosphonium Chloride
2018Co-Authors: Hongyan Chen, Megan Jobson, Andrew J Masters, Maria Gonzalez-miquel, Simon HalsteadAbstract:Solvent extraction is widely used for selective separation of metals from solutions. Ionic liquids are showing potential for this purpose. To date, little research has focused on design, operation, and optimization of solvent extraction Flowsheets using ionic liquids. This work addresses this gap in knowledge, aiming to support development, design, and optimization of such solvent extraction processes. In this work, a general Flowsheet Simulation model is developed and applied for the case of cobalt–nickel separation using ionic liquid trihexyl(tetradecyl)phosphonium chloride ([P66614]Cl). All components are treated as distributing between the two phases and are modeled using distribution coefficient models derived from published experimental data and ab initio computational results. The rate of mass transfer between the two phases is calculated using a mass transfer model. Simulation results are shown to be generally in good agreement with published experimental results
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Flowsheet Simulation of Cobalt–Nickel Separation Using Ionic Liquid Cyphos 101
Computer Aided Chemical Engineering, 2017Co-Authors: Hongyan Chen, Megan JobsonAbstract:Abstract Ionic liquids have been widely investigated in applications for chemical processes, including for the extraction of metals from aqueous mixtures. However, little research has focused on design, operation and optimisation of such processes. This work develops a Flowsheet Simulation model for extractive separation of cobalt and nickel using the ionic liquid trihexyltetradecyl phosphonium chloride (P66614Cl, Cyphos IL 101®). The Flowsheet model uses stirred tanks to simulate the mixer-settler for the extraction process. Distribution coefficients model is developed from literature experimental data. The mass transfer rate between the two phases is also calculated in a mass transfer model. Simulation results for single stage and multi-stage process show they are generally in good agreement with the experimental results from literatures.
Maksym Dosta - One of the best experts on this subject based on the ideXlab platform.
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dyssol an open source Flowsheet Simulation framework for particulate materials
SoftwareX, 2020Co-Authors: Vasyl Skorych, Maksym Dosta, Stefan HeinrichAbstract:Abstract Dyssol is a modelling framework for the dynamic Flowsheet Simulation of processes designed for handling of particulate materials. Main distinctive features of this software are the comprehensive description of multidimensionally distributed particulate materials, the application of transformation matrices and the use of sequential-modular Simulation approach. This cross-platform system can be easily extended with new models, applied for calculation of large datasets and coupled to the external programme packages.
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A Framework for Dynamic Simulation of Interconnected Solids Processes
Dynamic Flowsheet Simulation of Solids Processes, 2020Co-Authors: Vasyl Skorych, Maksym Dosta, Moritz Buchholz, Stefan HeinrichAbstract:The application of Flowsheet models to dynamic solids processes pose significant challenges, especially regarding the handling of the inherent multidimensionality of granular material properties, like particle size, shape and porosity distributions. The novel open-source Flowsheet Simulation framework Dyssol deals with this by applying an approach based on transformation matrices, which allows for the tracking of temporal changes in the multi-dimensional distributed parameters of the granular materials. The modelling system utilizes the sequential-modular approach in combination with partitioning and tearing methods as well as the waveform relaxation method for increased modelling flexibility while offering high computational performance. Dyssol includes an extensive and expandable model library for various unit operations in process engineering, that in turn may be calculated by user-defined solver units from a distinct library. To enhance the computational performance, the user may choose from different convergence and extrapolation methods. Material properties are defined in an extendable material database. Various case studies show robust stability and high convergence rates. The application of a global optimization algorithm shows promising results for the operational parameter adjustment in case of transient system behaviour. A concept of applying artificial neural networks to extend the scope of dynamic Flowsheet Simulation systems is proposed.
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Flowsheet Simulation of solids processes current status and future trends
Advanced Powder Technology, 2020Co-Authors: Maksym Dosta, J D Litster, Stefan HeinrichAbstract:Abstract Complex manufacturing processes are nowadays applied for production of various solid products. It is very common that for production of particles with desired properties several transformation steps like drying, milling, classification, granulation, etc. should be involved. This leads to the process structures consisting of different apparatuses or transformation substeps connected with material and energy balances. Consequently, development of new processes or optimization of already existing, as well as an optimal control, is a very challenging task, which can be partially solved using numerical modelling. For the Simulation of modern production processes, the Flowsheet calculations can be effectively used. Starting from the 80 s a lot of work focused on the Flowsheet Simulation of liquid-vapor systems has been done and as result various well-established systems exist today. With respect to the solid processes the intensive research has been started much later. In this contribution we present our view about a current role of Flowsheet Simulation for modeling of particulate materials and specify the open fields which can be covered in future research.
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Dyssol—An open-source Flowsheet Simulation framework for particulate materials
SoftwareX, 2020Co-Authors: Vasyl Skorych, Maksym Dosta, Stefan HeinrichAbstract:Abstract Dyssol is a modelling framework for the dynamic Flowsheet Simulation of processes designed for handling of particulate materials. Main distinctive features of this software are the comprehensive description of multidimensionally distributed particulate materials, the application of transformation matrices and the use of sequential-modular Simulation approach. This cross-platform system can be easily extended with new models, applied for calculation of large datasets and coupled to the external programme packages.
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Investigation of an FFT-based solver applied to dynamic Flowsheet Simulation of agglomeration processes
Advanced Powder Technology, 2019Co-Authors: Vasyl Skorych, Ernst-ulrich Hartge, Stefan Heinrich, Maksym Dosta, Robin Ahrens, Sabine Le BorneAbstract:Abstract The growth of particles due to agglomeration is often mathematically described by population balance equations. The numerical evaluation of these equations and applying new methods to their solution is an area of increasing interest. In this contribution, a new approach for solving the agglomeration population balance model based on a separable approximation of the agglomeration kernel and a fast Fourier transformation is investigated. Its applicability within a dynamic Flowsheet Simulation of continuous agglomeration processes with complex structures is analysed. A Simulation framework Dyssol is used to study the new method and compare it to the well-known fixed pivot technique. Studies have shown that the new approach can provide a more efficient solution if certain constraints on the number of classes and on the separation rank of the agglomeration kernel are met.