Investigation of the mixing-behaviour and performance of the agitation systems in biogas plants, aiming to optimize the fermentation process in existing plants and to collect information for future plant-construction guidance.
Abstract
The purpose of this project is the investigation of the mix-behaviour and performance of the agitation systems in biogas plants and to present them through Computational Fluid Dynamics (CFD) simulation. This EDP-tool can model and predict the actual fluid dynamics in a closed system. Thus it may help to plan optimal reactor geometries, position and combination of agitation systems as well as to minimize the energy requirements. Data from at least two biogas plants with different agitation systems will be collected. The rheologic behaviour of the reactor content will be experimentally studied and described taking in account the different substrates fed to the plant and the resulting particle-size and fiber-length distributions as well as the viscosity. These experimental procedures will be also improved and detailed on the basis of previous experience. The CFD-models will be tested through Bacillus globigii addition and interpretation of the resulting distribution curves. Modification of these basic models will be performed until predictions for the following problems may be stated: -Optimization of the mixing-dynamics in existing plants. -Optimal reactor geometries. -Minimization of the energetic requirements of the agitation systems. -Optimal agitation set-up for an agricultural biogas plant. Endproducts: For existing concepts/operators Guidelines for the optimal mix. Detection of dead volumes. Minimum energy consumption through optimal mixing. For new concepts/constructors Domain of application for the different agitation systems and parameters (propeller, paddle, speed…) as well as their combination possibilities. Most advantageous collocation inside the reactor. Minimum energetic requirements.
Biogas Computational Fluid Dynamics simulation Mixing devices CFD
Publikationen
Zwischenbericht zum Projekt AD.CFD (Entwicklung von Rührwerksystemen mit optimalem Mischverhalten in Biogasanlagen und verringertem Energiebedarf mittels numerischer Strömungssimulation)
Autoren: Pohn, S; Kamarad, L; Harasek, M; Bochmann, G Jahr: 2010
Forschungsbericht (extern. Auftraggeber)
Endbericht zum Projekt AD.CFD (Entwicklung von Rührwerksystemen mit optimalem Mischverhalten in Biogasanlagen und verringertem Energiebedarf mittels numerischer Strömungssimulation)
Autoren: Pohn, S; Kamarad, L; Harasek, M; Bochmann, G Jahr: 2011
Forschungsbericht (extern. Auftraggeber)
Project staff
Günther Bochmann
Dipl.-Ing. Dr.nat.techn. Günther Bochmann
guenther.bochmann@boku.ac.at
BOKU Project Leader
01.05.2008 - 31.12.2010
Ludek Poschmaier-Kamarad
Ludek Poschmaier-Kamarad Ph.D.
ludek.kamarad@boku.ac.at
Tel: +43 1 47654-97424, 97461
Project Staff
01.05.2008 - 31.12.2010
BOKU partners
External partners
AAT Abwasser- und Abfalltechnik GmbH & Co
Egon Arnold
partner
Öko Energie Strem reg. Gen. mbH
Ing. Siegfried Legath
partner
Rohkraft - Ing. Karl Pfiel GmbH
Ing. Karl Pfiel
partner
Thöni Industriebetriebe GmbH
DI(Fh) Michael Krismer
partner
Vienna University of Technology, Division of process engineering
DI Dr. Michael Harasek
coordinator