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

RENEWABLE ENERGY

卷:157

Article

Jegede, Abiodun O.^1,3  Gualtieri, Carlo²  Zeeman, Grietje^1,2  Bruning, Harry^1,2 

[1] Wageningen Univ, Subdept Environm Technol, Wageningen, Netherlands

[2] Univ Napoli, Civil Architectural & Environm Engn Dept DICEA, Naples, Italy

[3] Obafemi Awolowo Univ, Ctr Energy Res & Dev, Ife, Nigeria

关键词: Chinese dome digester (CDD);    Computational fluid dynamics (CFD);    Optimized designed;    Internal baffles;    Self-agitation cycle;   

DOI  :  10.1016/j.renene.2020.05.011

来源: Elsevier

【 摘 要 】

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 selfagitating 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. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free