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Analysis on temperature uniformity in methane-rich internal reforming solid oxide fuel cells (SOFCs).

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Title: Analysis on temperature uniformity in methane-rich internal reforming solid oxide fuel cells (SOFCs).
Authors: Lin, Chen1 (AUTHOR) chen.lin@tum.de, Kerscher, Florian1 (AUTHOR), Herrmann, Stephan1 (AUTHOR), Steinrücken, Benjamin1 (AUTHOR), Spliethoff, Hartmut1 (AUTHOR)
Source: International Journal of Hydrogen Energy. Feb2024, Vol. 57, p769-788. 20p.
Subjects: Solid oxide fuel cells, Uniformity, Thermal equilibrium, Gas as fuel, Temperature distribution
Abstract: Temperature uniformity is a critical parameter in solid oxide fuel cells (SOFCs) since it directly impacts thermal stress, material degradation and output performance. Effective thermal management typically aims to achieve a minimal temperature gradient, especially within a SOFC stack assembled by numerous single cells. In this study, numerical simulations of various boundary conditions and cell designs are performed to investigate thermal uniformity in methane-rich internal reforming SOFCs, which can be utilized as a guidance for design and operation in practical application. The results indicate that the fuel gas with a 5 % mole fraction of methane is more effective in enhancing thermal uniformity through reforming cooling effect at the electrolyte compared to only a 1 % mole fraction. It is strongly recommended in cell design to maintain the ratio of the cell's length to its width (R cell) greater than or equal to 1.0 considering its better thermal uniformity. However, both increasing the ratio of channel width to rib width (R c-r) and decreasing the ratio of channel height to channel width (R H-W) have been demonstrated to deteriorate temperature uniformity. Within this study, increasing the backpressure to 1.5 bar is found to result in a 16.7 % reduction in the maximum temperature difference across the electrolyte when compared to that at atmospheric pressure. It is also advisable to operate at the inlet temperature ranging from 973 K to 1023 K for a more uniform temperature distribution within the SOFC. [Display omitted] • The dry reforming of methane is considered in thermal equilibrium analysis. • Effects of flow filed structure and operating parameters are investigated. • Operating parameters affect system efficiency and thermal uniformity differently. • There is a sweet spot for the effects of inlet temperature on thermal uniformity. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 175546261
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Analysis on temperature uniformity in methane-rich internal reforming solid oxide fuel cells (SOFCs).
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Lin%2C+Chen%22">Lin, Chen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> chen.lin@tum.de</i><br /><searchLink fieldCode="AR" term="%22Kerscher%2C+Florian%22">Kerscher, Florian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Herrmann%2C+Stephan%22">Herrmann, Stephan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Steinrücken%2C+Benjamin%22">Steinrücken, Benjamin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Spliethoff%2C+Hartmut%22">Spliethoff, Hartmut</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Hydrogen+Energy%22">International Journal of Hydrogen Energy</searchLink>. Feb2024, Vol. 57, p769-788. 20p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Solid+oxide+fuel+cells%22">Solid oxide fuel cells</searchLink><br /><searchLink fieldCode="DE" term="%22Uniformity%22">Uniformity</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+equilibrium%22">Thermal equilibrium</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+as+fuel%22">Gas as fuel</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+distribution%22">Temperature distribution</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Temperature uniformity is a critical parameter in solid oxide fuel cells (SOFCs) since it directly impacts thermal stress, material degradation and output performance. Effective thermal management typically aims to achieve a minimal temperature gradient, especially within a SOFC stack assembled by numerous single cells. In this study, numerical simulations of various boundary conditions and cell designs are performed to investigate thermal uniformity in methane-rich internal reforming SOFCs, which can be utilized as a guidance for design and operation in practical application. The results indicate that the fuel gas with a 5 % mole fraction of methane is more effective in enhancing thermal uniformity through reforming cooling effect at the electrolyte compared to only a 1 % mole fraction. It is strongly recommended in cell design to maintain the ratio of the cell's length to its width (R cell) greater than or equal to 1.0 considering its better thermal uniformity. However, both increasing the ratio of channel width to rib width (R c-r) and decreasing the ratio of channel height to channel width (R H-W) have been demonstrated to deteriorate temperature uniformity. Within this study, increasing the backpressure to 1.5 bar is found to result in a 16.7 % reduction in the maximum temperature difference across the electrolyte when compared to that at atmospheric pressure. It is also advisable to operate at the inlet temperature ranging from 973 K to 1023 K for a more uniform temperature distribution within the SOFC. [Display omitted] • The dry reforming of methane is considered in thermal equilibrium analysis. • Effects of flow filed structure and operating parameters are investigated. • Operating parameters affect system efficiency and thermal uniformity differently. • There is a sweet spot for the effects of inlet temperature on thermal uniformity. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijhydene.2024.01.071
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 20
        StartPage: 769
    Subjects:
      – SubjectFull: Solid oxide fuel cells
        Type: general
      – SubjectFull: Uniformity
        Type: general
      – SubjectFull: Thermal equilibrium
        Type: general
      – SubjectFull: Gas as fuel
        Type: general
      – SubjectFull: Temperature distribution
        Type: general
    Titles:
      – TitleFull: Analysis on temperature uniformity in methane-rich internal reforming solid oxide fuel cells (SOFCs).
        Type: main
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            NameFull: Lin, Chen
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            NameFull: Kerscher, Florian
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            NameFull: Herrmann, Stephan
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            NameFull: Steinrücken, Benjamin
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            NameFull: Spliethoff, Hartmut
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            – D: 29
              M: 02
              Text: Feb2024
              Type: published
              Y: 2024
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              Value: 57
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