Simulation of SOFC performance using a modified exchange current density for pre-reformed methane-based fuels |
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| Affiliation: | 1. Faculty of Engineering, Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;2. Center of Coevolutionary Research for Sustainable Communities, Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;3. Platform of Inter / Transdisciplinary Energy Research (Q-PIT), Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;4. Next-Generation Fuel Cell Research Center (NEXT-FC), Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;5. International Research Center for Hydrogen Energy, Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;6. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;1. Department of Chemical Engineering, University of Engineering and Technology Lahore, Pakistan;2. Department of Process and Energy (Energy Technology), Delft University of Technology, 2628CB, Delft, the Netherlands;1. Department of High Temperature Electrochemical Processes, Institute of Power Engineering, Augustowka 36, 02-981 Warsaw, Poland;2. Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska 21/25, 00-665 Warsaw, Poland;1. School of Energy and Power, Jiangsu University of Science and Technology, 212003, Zhenjiang, Jiangsu, China;2. School of Mechanical and Engineering, Jiangsu University of Science and Technology, 212003, Zhenjiang, Jiangsu, China |
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| Abstract: | Numerical simulations can be used to visualize and better understand various distributions such as gas concentration and temperature in solid oxide fuel cells (SOFCs) under realistic operating conditions. However, pre-existing models generally utilize an anode exchange current density equation which is valid for humidified hydrogen fuels – an unrealistic case for SOFCs, which are generally fueled by hydrocarbons. Here, we focus on developing a new, modified exchange current density equation, leading to an improved numerical analysis model for SOFC anode kinetics. As such, we experimentally determine the exchange current density of SOFC anodes fueled by fully pre-reformed methane. The results are used to derive a new phenomenological anode exchange current density equation. This modified equation is then combined with computational fluid dynamics (CFD) to simulate the performance parameters of a three-dimensional electrolyte-supported SOFC. The new modified exchange current density equation for methane-based fuels reproduces the I–V characteristics and temperature distribution significantly better than the previous models using humidified hydrogen fuel. Better simulations of SOFC performance under realistic operating conditions are crucial for the prediction and prevention of e.g. fuel starvation and thermal stresses. |
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| Keywords: | Fully pre-reformed methane fueled SOFCs Phenomenological exchange current density equation Fuel utilization 3D-CFD simulation |
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