Scale-Up of the agitator speed based on computational fluid dynamics
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Autor:innen
Autor:in (Körperschaft)
Publikationsdatum
2021
Typ der Arbeit
Studiengang
Typ
05 - Forschungs- oder Arbeitsbericht
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
Ausgabe / Nummer
Seiten / Dauer
Patentnummer
Verlag / Herausgebende Institution
Hochschule für Life Sciences FHNW
Verlagsort / Veranstaltungsort
Muttenz
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
Siegfried in Zofingen is currently working on a hydrogenation reaction. To mimic the production
condition for the production, the reaction is carried out on a scale-down reactor laboratory scale
(approx. 1 liter). One important process parameter that should be similar during the experiments of
the scale-down reactor compared to the later production scale reactor is the mixing behaviour of the
agitator. The goal of this work is to find a concept for the appropriate scale-down of the agitator speed
based on computational fluid dynamics. This concept shall be compared to conventional scale up
methods. To validate this concept different experiment with water and glycerol, as well with and
without baffles, were carried out in a 5-litre scale reactor. For the simulation without baffles, the size
of the vortex has been compared to the real experiment as well as conventional calculation. In general,
the simulation predicted only a vortex 63.6 % of the measured size. In further experiments with
suspending of catalyst particles, simulation with baffles were validated with catalyst particle
behaviour. The particle behaviour in the experiments could not be measured accurately due to the
small size of the particles and the insufficient camera quality. The simulation with particles had a critical
error where particles got stuck on the wall which made the results unusable for particle movement
prediction. Even with the simulation working correctly, it would not be beneficial for this project, due
to the large amount of particles and the simplification done for the simulation. A second method was
uses, where the mean velocity of cells in the steady state were compared to each other. Out of 3
different agitator speeds, the agitator speed calculated with keeping P/V constant (571 rpm) was most
similar to the agitator speed of the reactor MZA1 (120 rpm). Due to the low sample size this only
supports the result but does not confirm it. As a consequence, the results of this thesis give an
indication for a possible solution to the stirring behaviour but conventional ways of finding the agitator
speed are still necessary. It can be used as steppingstone, but it is still required to refine these
simulations. Despite the dissatisfying result with the catalyst particles it could be shown that scale down of agitator speed can still be supported by the mean of computational fluid dynamics
Schlagwörter
computational fluid dynamics, CFD, Agitated Vessel, Rührkessel, Mixing
Fachgebiet (DDC)
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Publikationsstatus
Begutachtung
Keine Begutachtung
Open Access-Status
Lizenz
Zitation
ZOGG, Andreas und Christian David MAIER, 2021. Scale-Up of the agitator speed based on computational fluid dynamics. Muttenz: Hochschule für Life Sciences FHNW. Verfügbar unter: https://doi.org/10.26041/fhnw-4014