Development auf Stirring Systems with Improved Mixing Behaviour in Biogas Fermenters and Reduced Energy Consumption Using Computational Fluid Dynamics (CFD)

01.10.2008 - 31.12.2010
Forschungsförderungsprojekt
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 Dynam-ics (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 combina-tion 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 tak-ing in account the different substrates fed to the plant and the resulting particle-size and fi-ber-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 pre-dictions 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.

Personen

Projektleiter_in

Projektmitarbeiter_innen

Institut

Grant funds

  • FFG - Österr. Forschungsförderungs- gesellschaft mbH (National) Austrian Research Promotion Agency (FFG)

Forschungsschwerpunkte

  • Climate Neutral, Renewable and Conventional Energy Supply Systems: 20%
  • Computational Fluid Dynamics: 70%
  • Computer Science Foundations: 10%

Schlagwörter

DeutschEnglisch
Rührwerkstechnikmixing technology
Numerische StrömungssimulationComputational Fluid Dynamics
BiogasanlageBiogasconstruction
Energieeffizienzenergy efficiency

Externe Partner_innen

  • IFA Tulln
  • Thöni Industriebetriebe GmbH

Publikationen