Die Auslegung und Optimierung von Nasswaschern ausschlieslich anhand experimenteller Daten ist aufwendig. CFD-Werkzeuge zur Simulation von Nasswaschern konnen Experimente begleiten, um die Abscheideleistung der Apparate zu steigern und den Entwicklungsaufwand zu reduzieren. Es wird die Implementierung eines Modells zur Staubabscheidung bei Nasswaschern in der Simulationsumgebung ANSYS CFX vorgestellt. Basis der Implementierung ist die modellhafte Beschreibung der Reinigungswirkung von Einzeltropfen in einer staubbeladenen Gasatmosphare. Die berechneten spezifischen Reinigungsvolumina von Tropfen an einfachen Modellgeometrien zeigen eine gute Ubereinstimmung mit Literaturwerten.



The design and optimization of wet scrubbers solely based on laboratory experiments is a challenging task. In addition to laboratory experiments, CFD tools for wet scrubber simulation can improve the overall performance of wet scrubbers and reduce development efforts. Subroutines to map wet scrubbers into ANSYS CFX workbench are presented. The calculation of particle capture by individual water droplets is the major feature of the implementation. The simulated specific cleaning volumes of individual water droplets show a good agreement with values found in the literature within simple geometries.

CFD‐Simulation von Nasswäschern Teil 1. Grundlagen und Implementierung in ein kommerzielles CFD‐Programm

Zur Simulation von Waschvorgangen staubhaltiger Gase ist die Kenntnis des Auftreffgrads von Partikeln auf Tropfen in einem weiten Bereich der Tropfen-Reynolds-Zahlen mit hoher Auflosung notwendig. Hier wurden CFD-Simulationen angewendet, um die Auftreffgrade als Funktion der Tropfen-Reynolds-Zahl in hoher Auflosung zu berechnen. Die Tragheitsparameter wurden fur die Zahlen zwischen 0,1 und 100 jeweils uber den Partikeldurchmesser variiert, dessen Verhaltnis zum Tropfendurchmesser stets < 0,15 war. Die berechneten Auftreffgrade weichen zum Teil deutlich von den in der Literatur beschriebenen Ergebnissen ab.



For wet scrubber simulation the knowledge of collision efficiencies of particles with droplets is needed with high resolution and in a wide range of droplet Reynolds numbers. CDF simulations enabled the calculation of collision efficiencies as a function of droplet Reynolds numbers in high resolution. For every droplet Reynolds number between 0.1 and 100 the Stokes-Number was varied via the particle diameter, whose ratio to the droplet diameter was always smaller than 0.15. The calculated collision efficiencies presented here to some extend differ distinctively from the results known from the literature.

CFD-Modellrechnungen zum Auftreffgrad von Partikeln auf Tropfen

Die Herstellung von Formteilen und Dammstoffen aus modifizierten Polyurethanschaumen im Spruhverfahren hat in den letzten Jahren einen deutlichen Zuwachs erfahren. Hierbei werden Fullstoffe wie Glasfasern oder Metallpartikel in den Spruhstrahl eingebunden, um die gewunschten Produkteigenschaften zu erzielen. Die vorliegende Arbeit widmet sich der numerischen Simulation (CFD) der Spruhstrahlausbreitung unter besonderer Berucksichtigung der Einbindung von Partikeln in den Spruhstrahl. Experimentelle Untersuchungen an einer Spruhversuchsanlage zeigen, dass die hier vorgestellte Methode eine realitatsnahe Vorhersage der Partikeleinbindung in einen Spruhstrahl erlaubt.



Sound-absorbing mats consisting of cross-linked Polyurethane (PUR) foam and metal reinforcements, door panels and centre consoles for the interior of vehicles became important products for automotive component suppliers. The leading technology for the production of foam on the base of PUR with noise absorbing properties is the application of powder insertion (e.g. metal) in the PUR spray. The numerical simulation (CFD) of the spray including the particle-droplet interaction is presented. The theoretical background of the implemented models is explained and the experimental results achieved with a pilot plant are compared with the numerical results. The presented simulation offers the possibility to suitably predict the metal powder distribution in a PUR spray.

CFD-Simulation der Feststoffeinbindung in einen Sprühstrahl

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CFD-Simulation der Feststoffeinbindung in einen Sprühstrahl