Journal
RENEWABLE ENERGY
Volume 163, Issue -, Pages 78-87Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.08.091
Keywords
Biogas; Solid oxide fuel cell; Combined heat and power system; Hierarchical model
Funding
- Beijing National Science Foundation, China [3194058]
- National Natural Science Foundation of China, China [51806017]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- Alexander von Humboldt Foundation
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Biogas, a renewable energy source produced from anaerobic treatment of biological waste, shows promise as an alternative to fossil fuels in SOFC systems. Research focuses on the effects of biogas composition and operation voltage on system efficiency.
Biogas is an abundant renewable energy source which can be produced by anaerobic treatment of biological waste such as sewage sludge, agro-industrial waste, and industrial animal waste. The utili-zation of biogas instead of fossil fuels in a solid oxide fuel cell (SOFC)-based system is a promising choice to achieve a fossil-free and sustainable energy future. A biogas-fed decentralized SOFC combined heat and power (CHP) system model is proposed and analyzed. The system consists of a pre-reformer, an SOFC stack, an afterburner and a heat-recovery boiler. The system model integrates a multi-scale hierarchical three-dimensional SOFC stack model with zero-dimensional balance of power component models, which enables simultaneous investigations of both the overall system performance and the stack-internal distributed properties down to the electrode scale. The effects of steam/carbon ratio, biogas composition and operation voltage of the SOFC stack on the electrical and CHP efficiencies of the system, as well as the temperature gradient within the SOFC stack were studied. The proposed system model is demonstrated as an insightful and powerful tool for designing hybrid SOFC combined heat and power systems. (C) 2020 Elsevier Ltd. All rights reserved.
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