Е-Публикации
Технически университет - София

Abstract: Solid oxide fuel cell systems are a novel concept for combined heat and power (CHP) generation with high total efficiency and low emissions of harmful gases. In order to successfully review the operational processes of such a system, thermodynamic analyses are normally employed. The aim of this paper is to propose a SOFC system topology based on a preselected SOFC and determine the heat transfer rates as well as the overall efficiency of the plant by means of a mathematical model. The results indicate a total system efficiency of 0.628 without evaluating the energy available from the combustion of the remaining anode off-gas (AOG). Analysis of the effects of the steam to carbon (S/C) ratio on the system's behavior and outcomes is also performed. The analysis reveals that increasing the S/C ratio of the system leads to a decrease in the electrical efficiency, while the total efficiency of the system experiences a slight increase.

References

1. Meng T, Cui D, Shi Y, Ji Y, Cheng M, Tu B, et al. Performance evaluation of high-efficiency SOFC-PEMFC hybrid system fueled by liquid ammonia. Int J Hydrogen Energy 2023. https://doi.org/10.1016/j.ijhydene.2023.04.222.
2. Wu B, Luo Y, Feng Y, Zhu C, Yang P. Design and thermodynamic analysis of solid oxide fuel cells - internal combustion engine combined cycle system based on Two-Stage waste heat preheating and EGR. Fuel 2023;342:127817. https://doi.org/10.1016/j.fuel.2023.127817.
3. D.F. Chuahy F, Kokjohn SL. Solid oxide fuel cell and advanced combustion engine combined cycle: A pathway to 70% electrical efficiency. Appl Energy 2019;235:391-408. https://doi.org/10.1016/j.apenergy.2018.10.132.
4. Feng Y, Qu J, Zhu Y, Wu B, Wu Y, Xiao Z, et al. Progress and prospect of the novel integrated SOFC-ICE hybrid power system: System design, mass and heat integration, system optimization and techno-economic analysis. Energy Convers Manag X 2023;18:100350. https://doi.org/10.1016/j.ecmx.2023.100350.
5. Ahmadi S, Ghaebi H, Shokri A. A comprehensive thermodynamic analysis of a novel CHP system based on SOFC and APC cycles. Energy 2019;186:115899. https://doi.org/10.1016/j.energy.2019.115899.
6. Yari M, Mehr AS, Mahmoudi SMS, Santarelli M. A comparative study of two SOFC based cogeneration systems fed by municipal solid waste by means of either the gasifier or digester. Energy 2016;114:586-602. https://doi.org/10.1016/j.energy.2016.08.035.
7. Sapra H, Stam J, Reurings J, van Biert L, Sluijs W, de Vos P, et al. Integration of solid oxide fuel cell and internal combustion engine for maritime applications. Appl Energy 2020;281. https://doi.org/10.1016/j.apenergy.2020.115854.
8. Gechev T, Punov P, Dimitrova Z. Model-Based Study of The Influence of Selected Parameters on The Performance of a Low-Powered SOFC, n.d.

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