Evaluation of a pilot-scale sewage biogas powered 2.8 kWe Solid Oxide Fuel Cell: assessment of heat-to-power ratio and influence of oxygen content
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Biogas from anaerobic digestion of organic matter is a promising renewable energy source and fuel cells appear as a breakthrough technology to improve the performance of the biogas-to-energy valorisation chain. The vast majority of studies addressing biogas energy recovery through Solid Oxide Fuel Cells published in recent years correspond to simulations and lab-scale performance with synthetic biogas. This paper assesses the pilot performance of a 2.8 kWe SOFC unit powered with cleaned sewage biogas for around 700 h in a Wastewater Treatment Plant. The biogas thorough treatment consisting of a biological desulphurisation with a biotrickling filter followed by a deep cleaning step based on adsorption is successful for removing sulphur compounds, siloxanes and hydrocarbons. The influence of the heat-to-power ratio on fuel cell performance is investigated operating the system at O/C ratio of 2, reforming temperature of 550 °C, stack temperature of 800 °C and at a constant voltage of 43 V. At optimized conditions for electrical production satisfying heat demand in the WWTP, system electrical and thermal efficiencies account for 34% and 28%. Cogeneration efficiency remains constant at around 59–62% for all the heat-to-power ratios tested. Furthermore, the impact of the oxygen content in the biogas is also studied
Citationde Arespacochaga, N., Valderrama, C., Peregrina, C., Mesa, C., Bouchy, L., Cortina, J. Evaluation of a pilot-scale sewage biogas powered 2.8 kWe Solid Oxide Fuel Cell: assessment of heat-to-power ratio and influence of oxygen content. "Journal of power sources", 30 Desembre 2015, vol. 300, p. 325-335.