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    Demonstration of a 4-Cells SOFC Stack Under Different Experimental Conditions

    Source: Journal of Fuel Cell Science and Technology:;2008:;volume( 005 ):;issue: 001::page 11004
    Author:
    V. A. C. Haanappel
    ,
    M. Bertoldi
    ,
    T. Zandonella
    ,
    J. Mertens
    ,
    J. Remmel
    ,
    L. G. J. de Haart
    DOI: 10.1115/1.2398952
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Forschungszentrum Juelich (FZJ) has developed over the past years a well-known SOFC stack technology for a planar cell configuration. 1.5mm thick anode supported large-area cells based on a NiO∕YSZ (anode) and a YSZ (electrolyte) system are integrated in a stack using bipolar plates made of a special ferritic stainless steel acting as current collector and gas distributor. Materials, processes, and surface treatments have been selected and optimized to reduce mismatch between different components and to achieve high power densities. The recent SOFC stacks of F-design, fuelled with humidified hydrogen and air has demonstrated a power density as high as 0.6W∕cm2 at 800°C and a stable behavior up to 8000h of operation. These tests are usually performed in standard conditions, using a low value of fuel utilization and a precise control of gas composition, fuel, and airflow rates and temperature distribution. It seems quite difficult to maintain the same strict control of these parameters when the stack operates in an actual device. Therefore, it is of interest to investigate the effect of different experimental conditions on the electrochemical performance that can simulate stack behavior as integrated in a real system. For example, an actual fuel cell system is designed to operate with fuel utilization in the range between 70% and 85% due to efficiency considerations. In addition, variations of the electric load and of the corresponding flow rates must be expected that give rise to temperature changes and gradients within the stack. Part of these effects might be detrimental for the stack service life, and can be limited by a well-designed balance of plant of the system. In this contribution, results of a series of tests on a 4-cells SOFC stack of F design, manufactured by FZJ and conducted in a new SOFC test bench by Eurocoating, are presented. This facility allows the investigation of the performance of stacks up to 1kW as a function of several experimental parameters, including the amplitude of compressive loading, inlet gas temperature and pressure, flow rate, and fuel utilization.
    keyword(s): Flow (Dynamics) , Temperature , Electric potential , Anodes , Fuels , Density , Solid oxide fuel cells , Hydrogen , Design , Air flow , Current density , Testing , Pressure , Fuel cells , Electrolytes AND Stainless steel ,
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      Demonstration of a 4-Cells SOFC Stack Under Different Experimental Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/138373
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    • Journal of Fuel Cell Science and Technology

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    contributor authorV. A. C. Haanappel
    contributor authorM. Bertoldi
    contributor authorT. Zandonella
    contributor authorJ. Mertens
    contributor authorJ. Remmel
    contributor authorL. G. J. de Haart
    date accessioned2017-05-09T00:28:44Z
    date available2017-05-09T00:28:44Z
    date copyrightFebruary, 2008
    date issued2008
    identifier issn2381-6872
    identifier otherJFCSAU-28932#011004_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138373
    description abstractForschungszentrum Juelich (FZJ) has developed over the past years a well-known SOFC stack technology for a planar cell configuration. 1.5mm thick anode supported large-area cells based on a NiO∕YSZ (anode) and a YSZ (electrolyte) system are integrated in a stack using bipolar plates made of a special ferritic stainless steel acting as current collector and gas distributor. Materials, processes, and surface treatments have been selected and optimized to reduce mismatch between different components and to achieve high power densities. The recent SOFC stacks of F-design, fuelled with humidified hydrogen and air has demonstrated a power density as high as 0.6W∕cm2 at 800°C and a stable behavior up to 8000h of operation. These tests are usually performed in standard conditions, using a low value of fuel utilization and a precise control of gas composition, fuel, and airflow rates and temperature distribution. It seems quite difficult to maintain the same strict control of these parameters when the stack operates in an actual device. Therefore, it is of interest to investigate the effect of different experimental conditions on the electrochemical performance that can simulate stack behavior as integrated in a real system. For example, an actual fuel cell system is designed to operate with fuel utilization in the range between 70% and 85% due to efficiency considerations. In addition, variations of the electric load and of the corresponding flow rates must be expected that give rise to temperature changes and gradients within the stack. Part of these effects might be detrimental for the stack service life, and can be limited by a well-designed balance of plant of the system. In this contribution, results of a series of tests on a 4-cells SOFC stack of F design, manufactured by FZJ and conducted in a new SOFC test bench by Eurocoating, are presented. This facility allows the investigation of the performance of stacks up to 1kW as a function of several experimental parameters, including the amplitude of compressive loading, inlet gas temperature and pressure, flow rate, and fuel utilization.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleDemonstration of a 4-Cells SOFC Stack Under Different Experimental Conditions
    typeJournal Paper
    journal volume5
    journal issue1
    journal titleJournal of Fuel Cell Science and Technology
    identifier doi10.1115/1.2398952
    journal fristpage11004
    identifier eissn2381-6910
    keywordsFlow (Dynamics)
    keywordsTemperature
    keywordsElectric potential
    keywordsAnodes
    keywordsFuels
    keywordsDensity
    keywordsSolid oxide fuel cells
    keywordsHydrogen
    keywordsDesign
    keywordsAir flow
    keywordsCurrent density
    keywordsTesting
    keywordsPressure
    keywordsFuel cells
    keywordsElectrolytes AND Stainless steel
    treeJournal of Fuel Cell Science and Technology:;2008:;volume( 005 ):;issue: 001
    contenttypeFulltext
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