Unsteady state numerical study of carbon deposition on the performance of solid oxide fuel cell and variation of porosity

Khoshkam, H.; Atashkari, K.; Borji, M.

doi:10.22061/jcarme.2022.8347.2124

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	Unsteady state numerical study of carbon deposition on the performance of solid oxide fuel cell and variation of porosity
Journal of Computational & Applied Research in Mechanical Engineering (JCARME)
مقاله 9، دوره 12، شماره 2 - شماره پیاپی 24، فروردین 2023، صفحه 247-261 اصل مقاله (1.37 M)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22061/jcarme.2022.8347.2124
نویسندگان
H. Khoshkam¹؛ K. Atashkari^* ¹؛ M. Borji²
¹Department of Mechanical Engineering, University of Guilan, P.O. Box 3756, Rasht, Iran
²Department of Mechanical Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran
تاریخ دریافت: 01 شهریور 1400، تاریخ بازنگری: 21 شهریور 1401، تاریخ پذیرش: 09 مهر 1401
چکیده
Carbon deposition has a serious effect on the failure mechanism of solid oxide fuel cells. A comprehensive investigation based on a two-dimensional model of a solid oxide fuel cell with the detailed electrochemical model is presented to study the mechanism and effects of carbon deposition and unsteady state porosity variation. Studies of this kind can be an aid to identify the SOFC optimal working conditions and provide an approximate fuel cell lifetime. It has been revealed that, due to carbon deposition, the porosity coefficient of the fuel cell decreases. Consequently, a reduction in the amount of fuel consumption along the fuel cell and the chemical and electrochemical reaction rates are resulted which can be clearly seen in the off-gases molar ratio. The percentage of output fuel changes in the timeframe is useful information for optimizing CHP systems including fuel cells. The percentage of the output water vapor, which usually increases compared to the input, decreases by 17% at the end of the working period. Also, unreacted methane in the output of the fuel cell increased by 12%; in other words, it is wasted. The other consequence of carbon deposition reduced electrochemical and chemical reaction rates and the reduction of temperature difference along the cell. The study shows that after 145 working days, the temperature difference along the cell varies from 117 °C for the starting time to 7 °C. Also, by reducing the current density, the cell output power density decreases by 72% after 145 working days.
کلیدواژه‌ها
Solid oxide fuel cell؛ Carbon deposition؛ Porosity change؛ Numerical simulation؛ Temperature distribution

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Unsteady state numerical study of carbon deposition on the performance of solid oxide fuel cell and variation of porosity