The influence of sulfur compounds on Ni-YSZ anode of SOFC cell was investigated by measuring cell voltage under a constant current density for Ni-YSZ anode / YSZ electrolyte / (La,Sr)MnO 3 cathode cell. Two-step degradation of cell voltage was observed by supplying H 2 S containing fuel. The first-step degradation of cell voltage was recovered completely by switching to sulfur-free fuel, while the cell voltage wasn't recovered completely once the cell voltage went down under 0 V. After the cell with irreversible degradation was cooled down under pure N 2 atmosphere, it was analyzed by FE-SEM, EDX and Raman Spectroscopy. The results of these analyses revealed nickel sulfides formation in H 2 S containing fuel. It is supposed that melted nickel sulfides diffused in the anode and electrolyte layer. The irreversible cell poisoning might be caused by these nickel sulfides.
A 71 MWe pressurized fluidized bed coal combustor was operated. A wide variety of coals were burnt under fly ash recycle conditions. Limestone was fed to the combustor as bed material as well as sorbent. The emission of SO^ and limestone attrition rate were measured. A simple mathematical model of SO? capture by limestone with intermittent solid attrition was applied to the analysis of the present experimental results. Except for high sulfur fuel, the results of the present model agreed with the experimental results.
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