Performance analysis and temperature gradient of solid oxide fuel cell stacks operated with bio-oil sorption-enhanced steam reforming |
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| Affiliation: | 1. Center of Excellence in Process and Energy Systems Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;2. Institue for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), 76131, Karlsruhe, Germany;1. State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China;2. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;3. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing, 100028, China;1. Center of Excellence in Process and Energy Systems Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;2. Program in Food Process Engineering, School of Food-Industry, King Mongkut''s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand;3. Research Unit of Developing Technology and Innovation of Alternative Energy for Industries, Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi, 20131, Thailand;4. Bio-Circular-Green-economy Technology & Engineering Center, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;1. Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot Watt University, EH14 4AS, Edinburgh, UK;2. Department of Mechanical Engineering, University of Engineering and Technology, Lahore, Pakistan;1. Center of Excellence in Process and Energy Systems Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;2. Program in Food Process Engineering, Faculty of Food-Industry, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand;3. Bio-Circular-Green-economy Technology & Engineering Center, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand;4. Industrial Process and Energy Systems Engineering, École Polytechnique Fédérale de Lausanne, EPFL, 1951, Sion, Switzerland;1. Center of Excellence in Process and Energy Systems Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;2. Department of Chemical Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;3. Bio-Circular-Green-economy Technology & Engineering Center, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand |
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| Abstract: | A high temperature gradient within a solid oxide fuel cell (SOFC) stack is considered a major challenge in SOFC operations. This study investigates the effects of the key parameters on SOFC system efficiency and temperature gradient within a SOFC stack. A 40-cell SOFC stack integrated with a bio-oil sorption-enhanced steam reformer is simulated using MATLAB and DETCHEM. When the air-to-fuel ratio and steam-to-fuel ratio increase, the stack average temperature and temperature gradient decrease. However, a decrease in the stack temperature steadily reduces the system efficiency owing to the tradeoff between the stack performance and thermal balance between heat recovered and consumed by the system. With an increase in the bio-oil flow rate, the system efficiency decreases because of the lower resident time for the electrochemical reaction. This is not, however, beneficial to the maximum temperature gradient. To minimize the temperature gradient of the SOFC stack, a decrease in the bio-oil flow rate is the most effective way. The maximum temperature gradient can be reduced to 14.6 K cm?1 with the stack and system efficiency of 76.58 and 65.18%, respectively, when the SOFC system is operated at an air-to-fuel ratio of 8, steam-to-fuel ratio of 6, and bio-oil flow rate of 0.0041 mol s?1. |
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| Keywords: | Solid oxide fuel cell system System efficiency Temperature gradient Sorption-enhanced steam reforming |
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