Biogest Energie und Wassertechnik GmbH

Klosterneuburg, Austria

Biogest Energie und Wassertechnik GmbH

Klosterneuburg, Austria
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Maier C.,Vienna University of Technology | Weichselbaum W.,Biogest Energie und Wassertechnik GmbH | Schlerka M.,Biogest Energie und Wassertechnik GmbH | Harasek M.,Vienna University of Technology
Chemical Engineering Transactions | Year: 2010

In the presented work the mixing behavior and performance of the agitation system in biogas plants was studied to support the scale-up process by carrying out Computational Fluid Dynamic (CFD) analysis. The fermentation medium was implemented using an Euler-Euler multiphase approach. The description of specific material properties was achieved by implementing user-defined subroutines. CFD proved to be a very useful tool for this type of problem definitions. The results of the research work were successfully put into practice: The first facility in scale-up dimensions is already in operation, reducing the net CO2-emissions by the production of biogas. Copyright © 2010, AIDIC Servizi S.r.l.


Maier C.,Vienna University of Technology | Weichselbaum W.,Biogest Energie und Wassertechnik GmbH | Schlerka M.,Biogest Energie und Wassertechnik GmbH | Harasek M.,Vienna University of Technology
19th International Congress of Chemical and Process Engineering, CHISA 2010 and 7th European Congress of Chemical Engineering, ECCE-7 | Year: 2010

The mixing behavior and performance of the agitation system in biogas plants was studied using Computational Fluid Dynamic (CFD) analysis. Using CFD, the shortcomings of existing plants can be identified to work out proposals for the optimization of the operating conditions and for the construction and scale-up of new facilities. The time-dependent formation of the flow field in the fermenter and the resulting mixing characteristics were evaluated using time-resolved numerical simulations. Based on the results obtained for the base case (the established plant size), promising setups of the geometric configurations for the up-scaled main fermenter were defined and examined by CFD. The best setup included six slowly rotating mixing devices positioned evenly distributed along the perimeter of the circumferential main fermenter. This is an abstract of a paper presented at the 19th International Congress of Chemical and Process Engineering and 7th European Congress of Chemical Engineering (Prague, Czech Republic 8/28/2010-9/1/2010).

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