Experimental investigation of temperature distribution of planar solid oxide fuel cell: Effects of gas flow, power generation, and direct internal reforming

Sugihara, Shinichi

doi:10.1016/j.ijhydene.2020.06.033

Cited by 26 publications

(5 citation statements)

References 31 publications

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“…As for the simulation techniques, we have examined simulation techniques at the different level of scale (in Fig. 7) [6][7][8][9]. We have success in visualizing the microstructure change by degradation by using the 3D re-construction images: for example, Ni sintering/ coarsening was simulated under high water vapor pressure with polarization by the phase field method.…”

Section: Development Of Degradation Analyses Methods For Practical St...mentioning

confidence: 99%

Progress of the Evaluation and Analysis Methods for Durability of SOFC Stacks

Horita¹

2023

ECS Trans.

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Recent progress in the development of R&D for the evaluation and analytical methods of SOFC stack durability is reported under the NEDO Japanese national project. The goal of this project is the following two points: (1) to develop the advanced evaluation and analytical methods for the cell stacks which show a lifetime over 15 years (130 kh) with high efficiency of over 65% LHV, and (2) to develop the evaluation and analytical methods for dynamic operation mode such as rapid start-stop and load cycling. Three practical stacks (one flat tube and two types of planar) were supplied by the stack developers and tested over 10,000 hours with high fuel utilization (Uf~85%). It was found that the same evaluation methods can be applied to the stack resistance component determination between normal Uf (=75%) and high Uf (85%) conditions. Relatively stable performances were reported for these stacks and degradation factors were considered taking into account the degradation mechanisms at cells and stacks. Under high Uf conditions, some specific degradation mechanisms are now analyzed in the cells. For rapid starts of stacks, evaluation protocols are considered taking into account the mechanical stress arising from the thermal distribution in the cells. Simulation methods are considered for the evaluation of performance after 15 years of operation in the stacks.

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Section: Development Of Degradation Analyses Methods For Practical St...mentioning

confidence: 99%

Progress of the Evaluation and Analysis Methods for Durability of SOFC Stacks

Horita¹

2023

ECS Trans.

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“…文献中, 往往通过在阴极侧设置参比电极来测量纽扣电池的阳极电势 [20] . 然而, 对于工业尺寸的电池, 其表面组分、温度和电流密度都分布不均, 不同区域的阳极电势并不相等, 很难直接测得某一局部的的阳极电势 [32][33] . 因此, 实际运行过程中需要确定一个易测量的物理量来判断电池发生局部氧化的风险.…”

Section: 电池阳极安全运行条件unclassified

Study of Operating Conditions for High Efficiency and Anode Safety of Industrial-Size Solid Oxide Fuel Cell

Wang¹,

Li²,

Lyu³

et al. 2022

Acta Chimica Sinica

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Solid oxide fuel cell (SOFC) has been regarded as one of the promising energy conversion technologies since it provides higher efficiency and lower pollution than conventional power systems. How to improve the SOFC efficiency is one of the focus issues in both industry and academia. Besides, when industrial-size SOFC is operated at high fuel utilization (Ufuel) to achieve high efficiency, the Ni anode in the downstream region may be locally oxidized due to the high oxygen partial pressure. Thus, operating conditions for both high efficiency and anode safety are required. In this work, a method for the measurement and evaluation of SOFC efficiency was established. By comparing the test results under different conditions (current, fuel flow rate, and temperature) with high fuel utilization, it was found that at the same fuel utilization, the voltage decreased as the current increased. Therefore, the lower current is beneficial for higher efficiency, while the higher current is beneficial for higher power. The relationship between voltage fluctuation and local oxidation of anode during operation at high fuel utilization was also studied. After analyzing the critical condition of Ni oxidation, the cell output voltage higher than the critical electromotive force of Ni oxidation was proposed as the safe operating condition to prevent local oxidation of anode. Based on the cell samples and test parameters used in this work, it was found a high efficiency of over 50% was corresponding to the fuel utilization range of 77% to 90%. And the maximum electrical efficiency was always corresponding to Ufuel＝87.10%. Although the operating conditions corresponding to the maximum efficiency of SOFC cells or stacks with different materials, structures, and fabrication processes may vary, the measurement and evaluation methods, as well as the judgment of the safe operating condition proposed in this study, are still helpful. In practical application, the operating conditions could be determined based on such testing results according to the importance of efficiency, power and long-term stability. Keywords solid oxide fuel cell; high efficiency; high fuel utilization; local oxidation of anode; safe operating condition

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“…Several models exist in the literature to describe the SMR reaction. It can be divided to three types: Langmuir-Hinshelwood based models [42][43][44][45] ; first order in methanebased models [46][47][48][49] ; power law-based models. 23,30,50,51 The simplest mathematical approach used in the literature are based in the power law model, which depends on the first order in methane and water vapor.…”

Section: Kineticsmentioning

confidence: 99%

Performance evaluation of methane‐fueled reactor for hydrogen production: Experimental permeability measurements and reactive flow modeling

Settar

Perazzo

Chetehouna

2022

Intl J of Energy Research

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In this research, an evaluation of the performance improvement of a new reactor configuration for steam methane reforming (SMR) is carried out through a numerical-experimental approach. Two configurations of M-PCR have been studied numerically to compare the benefits. The first one consists of a conventional micro planar cell reactor (noted clear M-PCR), which is impregnated in its central axis in the direction of gas mixture flow by Ni/Al 2 O 3 catalyst. The second M-PCR configuration is equipped with nickel-based metal foam (MF) (noted M-PCR MF), which supports similar catalyst layer as for clear M-PCR configuration. The same operating conditions and catalyst weight density are set. 2D numerical solution of the transport equations was performed with a homemade code based on FORTRAN language to explore the heat and mass transfer during the SMR process. To better evaluate the nickel-based MF effects, permeability coefficients, that is, Darcy and inertial coefficients, were first measured using an experimental bench for hydrodynamic characterization of porous media. Comparison has showed that M-PCR MF configuration provides a significant enhancement in terms of hydrogen yield (73,25%). Furthermore, the catalyst layer length could be reduced by four times compared to conventional M-PCR due to MF implementation, leading to important economic improvement while keeping an interesting SMR efficiency.

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Experimental investigation of temperature distribution of planar solid oxide fuel cell: Effects of gas flow, power generation, and direct internal reforming

Cited by 26 publications

References 31 publications

Progress of the Evaluation and Analysis Methods for Durability of SOFC Stacks

Progress of the Evaluation and Analysis Methods for Durability of SOFC Stacks

Study of Operating Conditions for High Efficiency and Anode Safety of Industrial-Size Solid Oxide Fuel Cell

Performance evaluation of methane‐fueled reactor for hydrogen production: Experimental permeability measurements and reactive flow modeling

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