Journal
FUEL CELLS
Volume 16, Issue 3, Pages 313-318Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.201500056
Keywords
Coal Syngas; Coal Syngas Impurities; Ni-YSZ Anode; Solid Oxide Fuel Cells; Tolerance Limits; Validation by Comparison against Experiments
Categories
Funding
- US DOE Office of Basic Energy Sciences
- NETL (National Energy Technology Laboratory)
- WV State EPSCoR Office
- West Virginia University [DE-FG02-06ER46299]
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An engineering analysis based on calibrated numerical predictions was performed to estimate the minimum allowable impurity concentrations in coal syngas intended to be used in Solid Oxide Fuel Cells (SOFCs) operating for over 10,000 h. Arsine and phosphine, impurities that are known to have the most deleterious effects on the cell performance due to their affinity to have strong relations with the anode catalyst by formation of secondary phases, were investigated. Time to failure was taken as the operation time when 60% performance loss is incurred, estimated by the previously developed one-dimensional degradation model. Limiting concentrations were determined for arsine and phosphine fuel contaminants for electrolyte and anode supported SOFCs. Predicted lifetimes for single cells can provide a basis for estimation of SOFC stack lifetimes operating on coal syngas. Extrapolation of results from the numerical simulations based on accelerated laboratory tests at relatively higher concentrations can provide guidance into predicting the cell failure at low impurity concentrations.
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