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Three-phase simulation of the hydraulic characteristics of an optimized Chinese dome digester using COMSOL Multiphysics

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  • Jegede, Abiodun O.
  • Gualtieri, Carlo
  • Zeeman, Grietje
  • Bruning, Harry

Abstract

Domestic (household) biogas plants constitute a growing sub-sector of the anaerobic digestion industry worldwide but have received low interest for improvements. The Chinese dome digester (CDD 1), a major type of domestic biogas plants, is a naturally mixed, unheated and low technology reactor mainly used in rural and pre-urban areas for cooking using animal manure. In this study, a multiphase Computational Fluid Dynamics (CFD) model was applied to evaluate an optimized CDD design and outcomes were compared with results of pilot scale experiments. The optimized digester (CDD2) under goes self-agitating cycles created by the pressure variation from the produced biogas with the aid of a baffle at the top of the reactor, whereas the blank (CDD 1) does not self-agitate. The optimized digester has two pressure zones to improve mixing viz. the self-agitation cycles. The optimized digester is characterized by more, stable and improved hydraulic characteristics and mixing.

Suggested Citation

  • Jegede, Abiodun O. & Gualtieri, Carlo & Zeeman, Grietje & Bruning, Harry, 2020. "Three-phase simulation of the hydraulic characteristics of an optimized Chinese dome digester using COMSOL Multiphysics," Renewable Energy, Elsevier, vol. 157(C), pages 530-544.
    • Handle: RePEc:eee:renene:v:157:y:2020:i:c:p:530-544
    DOI: 10.1016/j.renene.2020.05.011
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    References listed on IDEAS

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    1. Khan, Ershad Ullah & Martin, Andrew R., 2016. "Review of biogas digester technology in rural Bangladesh," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 247-259.
    2. Yu, Liang & Ma, Jingwei & Frear, Craig & Zhao, Quanbao & Dillon, Robert & Li, Xiujin & Chen, Shulin, 2013. "Multiphase modeling of settling and suspension in anaerobic digester," Applied Energy, Elsevier, vol. 111(C), pages 28-39.
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    4. Abiodun O. Jegede & Grietje Zeeman & Harry Bruning, 2019. "Development of an Optimised Chinese Dome Digester Enables Smaller Reactor Volumes; Pilot Scale Performance," Energies, MDPI, vol. 12(11), pages 1-15, June.
    5. Abiodun O. Jegede & Grietje Zeeman & Harry Bruning, 2019. "Effect of Mixing Regimes on Cow Manure Digestion in Impeller Mixed, Unmixed and Chinese Dome Digesters," Energies, MDPI, vol. 12(13), pages 1-14, July.
    6. Cheng, Shikun & Li, Zifu & Mang, Heinz-Peter & Huba, Elisabeth-Maria, 2013. "A review of prefabricated biogas digesters in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 28(C), pages 738-748.
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