Effect of the geometry of the draft tube on mixing in the reactor with internal circulation loop - CFD simulation

P. Lestinsky, M. Vecer, P. Vayrynen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

The main topic of present paper is to describe the effect of geometrical parameters on mixing time in the reactor with internal circulation loop. Laboratory scale apparatus with internal circulation loop consists of concentric draft tube, in which gas bubbles rise. Design of draft tube inside of reactor is important geometry parameter and has big influence on two phase hydrodynamics as well as on mass transfer in the reactor. In the first part here, the validation of selected mathematical model (mixed flow) is carried out. Results of experimental measurements (liquid velocity and gas hold-up) obtained on the laboratory scale reactor with internal circulation loop are compared with the CFD simulations. The CFD simulation (bubbly flow and mass transfer models) was made by COMSOL Multiphysics version 3.5a. The obtained results of numerical simulation are in good agreement with experimental data. In the second part, the study of mixing in the reactor with new geometry of the draft tube is described. The standard experimental techniques for testing of mixing processes are quite problematic, because common tracers (soluble salts) have significant influence on the two phase hydrodynamics inside the reactor. So the alternative nontrivial method should be used. Obtained results show that the split of the draft tube onto two or three zones has significant effect onto mixing (mass transfer) in the reactor.

Original languageEnglish
Title of host publication21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014
PublisherCzech Society of Chemical Engineering
Pages797-808
Number of pages12
Volume2
ISBN (Electronic)9781510828131
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventInternational Congress of Chemical and Process Engineering - Prague, Czech Republic
Duration: 23 Aug 201427 Aug 2014

Conference

ConferenceInternational Congress of Chemical and Process Engineering
Abbreviated titleCHISA
CountryCzech Republic
CityPrague
Period23/08/201427/08/2014

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