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

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

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)530-544
Number of pages15
JournalRenewable Energy
Volume157
DOIs
Publication statusPublished - Sep 2020

Keywords

  • Chinese dome digester (CDD)
  • Computational fluid dynamics (CFD)
  • Internal baffles
  • Optimized designed
  • Self-agitation cycle

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