3D thermo-electro-chemo-mechanical coupled modeling of solid oxide fuel cell with double-sided cathodes

Jiang, Congying; Gu, Yalong; Guan, Wanbing; Zheng, Jianfeng; Ni, Meng; Zhong, Zheng

doi:10.1016/j.ijhydene.2019.10.139

Cited by 39 publications

(20 citation statements)

References 43 publications

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“…where S represents the mass source term, which represents the change in the mass of the gas species due to the electrochemical reactions, ω is the mass fraction, j is the mass flow rate, and D mk is the effective diffusion coefficient determined from Fick's diffusion coefficient (D m ) and Knudsen's diffusion coefficient (D k ) [6].…”

Section: Gas Species Transportmentioning

confidence: 99%

“…Compared with other new energy technology, SOFCs have obvious advantages, such as high thermal efficiency with good fuel flexibility [5]. However, in the operating temperature range of 700~1000 • C, cracks and structure damage may occur in SOFC stacks due to a mismatch of thermal expansion coefficients (CTE) of the various functional components involved [6][7][8][9][10]. In the operating process, high temperature gradients and thermal stress generated by the electrochemical reactions may lead to performance degradation and even failure [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Thermal Stress for a Stack of Planar Solid Oxide Fuel Cells

Zheng

Xiao

et al. 2022

Energies

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In this work, a 3D multi-physics coupled model was developed to analyze the temperature and thermal stress distribution in a planar solid oxide fuel cell (SOFC) stack, and then the effects of different flow channels (co-flow, counter-flow and cross-flow) and electrolyte thickness were investigated. The simulation results indicate that the generated power is higher while the thermal stress is lower in the co-flow mode than those in the cross-flow mode. In the cross-flow mode, a gas inlet and outlet arrangement is proposed to increase current density by about 10%. The generated power of the stack increases with a thin electrolyte layer, but the temperature and its gradient of the stack also increase with increase of heat generation. The thermal stress for two typical sealing materials is also studied. The predicted results can be used for design and optimization of the stack structure to achieve lower stress and longer life.

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Section: Gas Species Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Thermal Stress for a Stack of Planar Solid Oxide Fuel Cells

Zheng

Xiao

et al. 2022

Energies

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“…This model includes adjustment equations to simulate the exchange behaviors, charge and temperature of the species, as well as the constitutive correlation to calculate the flow density. The anode and cathode electrochemical reactions in the cell are shown in following equations [9,10].…”

Section: Mathematic Equationmentioning

confidence: 99%

Simulation Study on the Effects of Operating Temperature on Cell Electrodes in Solid Oxide Fuel Cells

2022

JST: ETSD

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In this study, a three−dimensional numerical simulation on electrodes in solid oxide fuel cells (SOFCs) is investigated in both regular cell and button cell configurations. The cell unit models with a regular cell with an active area of 5cm × 5cm and with a button cell with an active area of 2.54 cm2 were conducted to investigate the voltage distribution on cell electrodes in the solid oxide fuel cells (SOFCs). The performance characteristics in SOFC cell unit are determined through a numerical simulation method by using a computational fluid dynamic (CFD). The COMSOL Multiphysics software is used to investigate the model. The results show that the cell voltage in both regular cell and button cell with operating temperatures of 650 and 700 °C were lower than those at 750 °C. This means that when the operating temperature increases, the voltage and current density on the solid oxide fuel cell electrodes increases, and the performance of the cell is also improved.

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“…Moreover, the difference between the lower and the higher temperature is less than 100 K, whereas it is more than 250 K in the kinetics base case. Since it is estimated that about 30% of occurring stresses are due to thermal gradients, this configuration offers a relevant improvement to guarantee long-term operations [59]. This result is obtained by expanding the CH 4 reforming zone in order to have a more homogeneous conversion and consequently a minor temperature drop caused by the reforming endothermicity.…”

Section: Reforming Operating Condition Degradationmentioning

confidence: 99%

2D Simulation for CH4 Internal Reforming-SOFCs: An Approach to Study Performance Degradation and Optimization

2020

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Solid oxide fuel cells (SOFCs) are a well-developed technology, mainly used for combined heat and power production. High operating temperatures and anodic Ni-based materials allow for direct reforming reactions of CH4 and other light hydrocarbons inside the cell. This feature favors a wider use of SOFCs that otherwise would be limited by the absence of a proper H2 distribution network. This also permits the simplification of plant design avoiding additional units for upstream syngas production. In this context, control and knowledge of how variables such as temperature and gas composition are distributed on the cell surface are important to ensure good long-lasting performance. The aim of this work is to present a 2D modeling tool able to simulate SOFC performance working with direct internal CH4 reforming. Initially thermodynamic and kinetic approaches are compared in order to tune the model assuming a biogas as feed. Thanks to the introduction of a matrix of coefficients to represent the local distribution of reforming active sites, the model considers degradation/poisoning phenomena. The same approach is also used to identify an optimized catalyst distribution that allows reducing critical working conditions in terms of temperature gradient, thus facilitating long-term applications.

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3D thermo-electro-chemo-mechanical coupled modeling of solid oxide fuel cell with double-sided cathodes

Cited by 39 publications

References 43 publications

Numerical Analysis of Thermal Stress for a Stack of Planar Solid Oxide Fuel Cells

Numerical Analysis of Thermal Stress for a Stack of Planar Solid Oxide Fuel Cells

Simulation Study on the Effects of Operating Temperature on Cell Electrodes in Solid Oxide Fuel Cells

2D Simulation for CH4 Internal Reforming-SOFCs: An Approach to Study Performance Degradation and Optimization

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