Analysis of a biogas-fed SOFC CHP system based on multi-scale hierarchical modeling

RENEWABLE ENERGY

卷:163

Article

Wang, Yuqing^1,2  Wehrle, Lukas²  Banerjee, Aayan^3,4  Shi, Yixiang⁵  Deutschmann, Olaf² 

[1] Beijing Inst Technol, Natl Key Lab Electromech Dynam Control, Beijing 100081, Peoples R China

[2] Karlsruhe Inst Technol, Inst Chem Technol & Polymer Chem, D-76133 Karlsruhe, Germany

[3] Imperial Coll London, Dept Earth Sci & Engn, London SW7 2BP, England

[4] Univ Twente, MESA Inst Nanotechnol, Fac Sci & Technol, Catalyt Proc & Mat Grp, POB 217, NL-7500 AE Enschede, Netherlands

[5] Tsinghua Univ, Dept Energy & Power Engn, Minist Educ, Key Lab Thermal Sci & Power Engn, Beijing 100084, Peoples R China

关键词: Biogas;    Solid oxide fuel cell;    Combined heat and power system;    Hierarchical model;   

DOI  :  10.1016/j.renene.2020.08.091

来源: Elsevier

【 摘 要 】

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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