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Title: ELECTROCHEMISTRY AND ON-CELL REFORMATION MODELING FOR SOLID OXIDE FUEL CELL STACKS

Abstract

ABSTRACT Providing adequate and efficient cooling schemes for solid-oxide-fuel-cell (SOFC) stacks continues to be a challenge coincident with the development of larger, more powerful stacks. The endothermic steam-methane reformation reaction can provide cooling and improved system efficiency when performed directly on the electrochemically active anode. Rapid kinetics of the endothermic reaction typically causes a localized temperature depression on the anode near the fuel inlet. It is desirable to extend the endothermic effect over more of the cell area and mitigate the associated differences in temperature on the cell to alleviate subsequent thermal stresses. In this study, modeling tools validated for the prediction of fuel use, on-cell methane reforming, and the distribution of temperature within SOFC stacks, are employed to provide direction for modifying the catalytic activity of anode materials to control the methane conversion rate. Improvements in thermal management that can be achieved through on-cell reforming is predicted and discussed. Two operating scenarios are considered: one in which the methane fuel is fully pre-reformed, and another in which a substantial percentage of the methane is reformed on-cell. For the latter, a range of catalytic activity is considered and the predicted thermal effects on the cell are presented. Simulations of themore » cell electrochemical and thermal performance with and without on-cell reforming, including structural analyses, show a substantial decrease in thermal stresses for an on-cell reforming case with slowed methane conversion.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
947934
Report Number(s):
PNNL-SA-47970
AA2530000; TRN: US200905%%316
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, 27(4):409-418
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 30 DIRECT ENERGY CONVERSION; ANODES; CERAMICS; DISTRIBUTION; EFFICIENCY; ELECTROCHEMISTRY; FORECASTING; KINETICS; MANAGEMENT; METHANE; PERFORMANCE; SIMULATION; SOLID OXIDE FUEL CELLS; TEMPERATURE DEPENDENCE; THERMAL STRESSES; solid; oxide; fuel; cell

Citation Formats

Recknagle, Kurtis P., Jarboe, Daniel T., Johnson, Kenneth I., Korolev, Alexander, Khaleel, Mohammad A., and Singh, Prabhakar. ELECTROCHEMISTRY AND ON-CELL REFORMATION MODELING FOR SOLID OXIDE FUEL CELL STACKS. United States: N. p., 2007. Web. doi:10.1002/9780470291337.
Recknagle, Kurtis P., Jarboe, Daniel T., Johnson, Kenneth I., Korolev, Alexander, Khaleel, Mohammad A., & Singh, Prabhakar. ELECTROCHEMISTRY AND ON-CELL REFORMATION MODELING FOR SOLID OXIDE FUEL CELL STACKS. United States. doi:10.1002/9780470291337.
Recknagle, Kurtis P., Jarboe, Daniel T., Johnson, Kenneth I., Korolev, Alexander, Khaleel, Mohammad A., and Singh, Prabhakar. Tue . "ELECTROCHEMISTRY AND ON-CELL REFORMATION MODELING FOR SOLID OXIDE FUEL CELL STACKS". United States. doi:10.1002/9780470291337.
@article{osti_947934,
title = {ELECTROCHEMISTRY AND ON-CELL REFORMATION MODELING FOR SOLID OXIDE FUEL CELL STACKS},
author = {Recknagle, Kurtis P. and Jarboe, Daniel T. and Johnson, Kenneth I. and Korolev, Alexander and Khaleel, Mohammad A. and Singh, Prabhakar},
abstractNote = {ABSTRACT Providing adequate and efficient cooling schemes for solid-oxide-fuel-cell (SOFC) stacks continues to be a challenge coincident with the development of larger, more powerful stacks. The endothermic steam-methane reformation reaction can provide cooling and improved system efficiency when performed directly on the electrochemically active anode. Rapid kinetics of the endothermic reaction typically causes a localized temperature depression on the anode near the fuel inlet. It is desirable to extend the endothermic effect over more of the cell area and mitigate the associated differences in temperature on the cell to alleviate subsequent thermal stresses. In this study, modeling tools validated for the prediction of fuel use, on-cell methane reforming, and the distribution of temperature within SOFC stacks, are employed to provide direction for modifying the catalytic activity of anode materials to control the methane conversion rate. Improvements in thermal management that can be achieved through on-cell reforming is predicted and discussed. Two operating scenarios are considered: one in which the methane fuel is fully pre-reformed, and another in which a substantial percentage of the methane is reformed on-cell. For the latter, a range of catalytic activity is considered and the predicted thermal effects on the cell are presented. Simulations of the cell electrochemical and thermal performance with and without on-cell reforming, including structural analyses, show a substantial decrease in thermal stresses for an on-cell reforming case with slowed methane conversion.},
doi = {10.1002/9780470291337},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 16 00:00:00 EST 2007},
month = {Tue Jan 16 00:00:00 EST 2007}
}

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