Performance comparison of three solid oxide fuel cell power systems

Jia, Junxi; Abudula, Abuliti; Wei, Liming; Shi, Yue

doi:10.1002/er.3000

Cited by 30 publications

(13 citation statements)

References 29 publications

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“…Then, the mass conservation equation can be described as u y ∂C i;channel ∂y ¼ κ i I n i Fδ channel (1) where C i, channel (mol m −3 ) represents the gas concentration of species i along the channel, κ i is the stoichiometric coefficient (1 for H 2 and O 2 , −1 for H 2 O), n i is the charge transfer number of species i, and I (A m −2 ) refers to the current density distribution along the channel. The assumption above simplifies the model a lot by avoiding complicated momentum equation solving process with great numerical accuracy.…”

Section: Mass Transport In Channelmentioning

confidence: 99%

“…1,2 Despite those excellent features, extensive efforts are needed before successful commercialization of SOFC, for example, further SOFC performance improvement by design optimization of electrode structure. 1,2 Despite those excellent features, extensive efforts are needed before successful commercialization of SOFC, for example, further SOFC performance improvement by design optimization of electrode structure.…”

Section: Introductionmentioning

confidence: 99%

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Global sensitivity analysis of uncertain parameters based on 2D modeling of solid oxide fuel cell

et al. 2019

Int J Energy Res

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Summary In this study, we propose an enhanced quasi–two‐dimensional and nonisothermal model for solid oxide fuel cell (SOFC) parametric simulation and optimization. The dependence of effective properties on microstructural parameters is fully considered in this model. Besides, an elementary effect (EE) approach based on Monte Carlo experiments is adopted to comprehensively evaluate the sensitivity of totally 24 parameters. A two sample Kolmogorov‐Smirnov (K‐S) test is carried out to evaluate the ability of EE method for robust and accurate sensitivity analysis. The investigation focuses on the important microstructural parameters of the composite anode/cathode function layers (AFL/CFL). With this research, relative volume fractions of conducting materials in the AFL/CFL are the most sensitive factors among all input parameters while particle radius is found to be the least sensitive microstructural parameters. The particle size ratio of electronic particles to ionic particles is found to be much more sensitive than particle size due to its significant effect on effective conductivity. The cathodic electrochemical parameters reflect cell performance more significantly than the anodic ones. To further elucidate the role of input factors, this study provides a principle for parametric sensitivity classification as well. Besides, impacts of current density variation on parametric sensitivity are comprehensively considered. Negative or positive effects of parameters on cell performance and their influencing mechanisms are also discussed. Furthermore, global sensitivity analysis for single parameters at different positions is performed to assess the probability of structural optimization along the channel length. Then, a feasible nonuniform distribution method in allusion to function layers is proposed for further improvement of cell performance according to global SA results of single parameters along the channel direction.

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Section: Mass Transport In Channelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Global sensitivity analysis of uncertain parameters based on 2D modeling of solid oxide fuel cell

et al. 2019

Int J Energy Res

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“…As a kind of high temperature (600‐800°C) fuel cell, SOFC can directly utilize hydrocarbon fuels (ie, natural gas, syngas or biodiesel) and can be designed as modules in different application fields. It has wide application prospects in distributed energy, auxiliary power and centralized large‐scale power generation …”

Section: Introductionmentioning

confidence: 99%

“…It has wide application prospects in distributed energy, auxiliary power and centralized large-scale power generation. 6 Since SOFC operates at high temperatures, the mechanical failure stimulated by thermal stress is serious. [7][8][9] Researchers usually used numerical methods to examine the thermal stress characteristics of different SOFC structures, including single channel units, single cell 10,11 and cell stack.…”

mentioning

confidence: 99%

Effect of interface morphology on the residual stress distribution in solid oxide fuel cell

Cao

et al. 2020

Int J Energy Res

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Summary Solid oxide fuel cell directly and efficiently converts chemical energy to electrical energy. However, the necessity for high operating temperatures can result in mechanical failure. Fuel cell is a multilayer system and its stress distribution is greatly affected by the interface morphology. In this work, cosine interfaces with different amplitudes are used to approximate the fluctuation of actual interface. The effects of interface morphology on stress state, energy release rate of crack and creep behavior have been investigated. The results show that if the interface is planar, the residual normal stress component is zero on the interface, while the nonplanarity of interface can cause the normal stress Sn and shear stress St on the interface. When the amplitude is relatively small, the max values of Sn and St on the interfaces vary linearly with increasing amplitudes in both anode and cathode. Above a certain value, nonlinearity of the interface becomes important. Max tensile Sn always occurs at the peak of convex interface, but the position of max compressive Sn varies. Max shear stress is prone to occur at 1/4 of the wavelength at small amplitude and moves towards 1/2 of the wavelength when the amplitude increases. Fracture mechanics analysis shows that the surface crack possibly penetrates into the anode function layer and then is constrained by the stiff electrolyte. On the other hand, the horizontal crack likely penetrates into the electrolyte layer when the interface is not planar. Creep analysis shows that 11 800 hours of continuous operation at high temperature cannot remove stress undulation introduced by nor‐planar interface but can make max value of Sn and St decrease around 30%.

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“…1,2 The SOFC can be applied to submarines, automobiles, and so on for the advantages of high specific energy, high power generating efficiency, low noise, and environmental friendly property. [3][4][5][6] So, replacing diesel energy with SOFC energy as the driving force for the air-independent propulsion submarine may be an excellent choice to decrease the vibration, noise, and emission and improve the concealment of submarine. [7][8][9][10] However, at present, the durability and stability of SOFC are principal issues that need to be resolved prior to commercialization.…”

Section: Introductionmentioning

confidence: 99%

The analysis of interfacial thermal stresses of solid oxide fuel cell applied for submarine power

2018

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Summary Solid oxide fuel cell (SOFC) due to its high energy conversion rate and low noise can replace diesel energy as the submarine power. The interface thermal stress has an important effect on the stabilization and endurance of SOFC. The thermomechanical model of SOFC, which takes the interfacial layer into account, is developed to analyze the interfacial thermal stresses between electrodes and electrolyte in this paper. Based on the formation mechanism and composition distribution of the interfacial layer and the stress analysis of the half‐cell system, the material property of the interfacial layer is determined and the interfacial thermal stress is expressed accurately. The finite element model of SOFC is employed to investigate the interfacial thermal stress, and the simulated result agrees well with the theoretical result. The modified expressions of interfacial thermal stresses for numerical result are given to analyze the difference between theoretical and simulated results at the free edge of SOFC. The anode‐electrolyte interface needs to be concerned because its thermal stress level is higher and more likely to fail and partially delaminate compared with that of cathode‐electrolyte interface. In addition, the optimization scheme with respect to the interfacial layer thickness is obtained and the interfacial thermal stress decreases with the increase of the interfacial layer thickness. The research provides guidance for determining and minimizing the interfacial thermal stresses of SOFC.

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Performance comparison of three solid oxide fuel cell power systems

Cited by 30 publications

References 29 publications

Global sensitivity analysis of uncertain parameters based on 2D modeling of solid oxide fuel cell

Global sensitivity analysis of uncertain parameters based on 2D modeling of solid oxide fuel cell

Effect of interface morphology on the residual stress distribution in solid oxide fuel cell

The analysis of interfacial thermal stresses of solid oxide fuel cell applied for submarine power

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