Chapter 1
Process Modeling for Dynamic Disperse
Particle Separation and Deposition
Processes
Sören Sander, Lizoel Buss, and Udo Fritsching
1 Introduction
Dynamic particulate process models are to be derived within the framework of
dynamic flowsheet modeling and simulation (FSS). In the contribution FSS is developed for the separation processes of solid particles from a fluid resp. gas. Potential
applications of the dynamic simulation environment of particle separation are for
instance in the analysis and design of the dynamic process behavior in the purification of exhaust gases (for example to reduce emissions from combustion processes)
but also in the production of particle layers with defined properties, as occur in the
powder coating of surfaces.
A specific focus of the derivation is on analysis of gas cleaning of a particleladen air stream through a plate-wire electrostatic precipitator. In this process, the
intensification of the degree of separation is achieved by the application of electric
field forces. The result is a coupled multiphase flow system in which interactions
between the electric field, the fluid phase and the particles on several scales lead to
a complex relationship between the degree of precipitation and the conditions in the
process.
The properties of the particulate material, the feed stream parameters as well as
the specific process control directly influence the output stream conditions as for
instance the particle size distribution and dust concentration, thus the precipitation
efficiency of the process. The specific spatial distribution of the particles and their
charges may cause temporal changes in the deposition behavior in the apparatus.
The locally varying thickness of the deposited particle layer increasingly influences
the re-dispersion and re-entrainment of already deposited particles back into the
flow field. This successive growing particle layer structure plays a significant role,
especially during the transient startup phase of the process. For heavy load changes,
S. Sander · L. Buss · U. Fritsching (B)
Leibniz-Institute for Materials Engineering IWT, Particles and Process Engineering,
University of Bremen, Badgasteiner Strasse 3, 28359 Bremen, Germany
e-mail: ufri@iwt.uni-bremen.de
© Springer Nature Switzerland AG 2020
S. Heinrich (ed.), Dynamic Flowsheet Simulation of Solids Processes,
https://doi.org/10.1007/978-3-030-45168-4_1
3
Process Modeling for Dynamic Disperse
Particle Separation and Deposition
Processes
Sören Sander, Lizoel Buss, and Udo Fritsching
1 Introduction
Dynamic particulate process models are to be derived within the framework of
dynamic flowsheet modeling and simulation (FSS). In the contribution FSS is developed for the separation processes of solid particles from a fluid resp. gas. Potential
applications of the dynamic simulation environment of particle separation are for
instance in the analysis and design of the dynamic process behavior in the purification of exhaust gases (for example to reduce emissions from combustion processes)
but also in the production of particle layers with defined properties, as occur in the
powder coating of surfaces.
A specific focus of the derivation is on analysis of gas cleaning of a particleladen air stream through a plate-wire electrostatic precipitator. In this process, the
intensification of the degree of separation is achieved by the application of electric
field forces. The result is a coupled multiphase flow system in which interactions
between the electric field, the fluid phase and the particles on several scales lead to
a complex relationship between the degree of precipitation and the conditions in the
process.
The properties of the particulate material, the feed stream parameters as well as
the specific process control directly influence the output stream conditions as for
instance the particle size distribution and dust concentration, thus the precipitation
efficiency of the process. The specific spatial distribution of the particles and their
charges may cause temporal changes in the deposition behavior in the apparatus.
The locally varying thickness of the deposited particle layer increasingly influences
the re-dispersion and re-entrainment of already deposited particles back into the
flow field. This successive growing particle layer structure plays a significant role,
especially during the transient startup phase of the process. For heavy load changes,
S. Sander · L. Buss · U. Fritsching (B)
Leibniz-Institute for Materials Engineering IWT, Particles and Process Engineering,
University of Bremen, Badgasteiner Strasse 3, 28359 Bremen, Germany
e-mail: ufri@iwt.uni-bremen.de
© Springer Nature Switzerland AG 2020
S. Heinrich (ed.), Dynamic Flowsheet Simulation of Solids Processes,
https://doi.org/10.1007/978-3-030-45168-4_1
3