Abstract
The authors describe an electrochemical cell used to remove SO/sub 2/ from simulated flue gas and concentrate it into a byproduct gas, SO/sub 3/. The cell comprises an immobilized molten salt electrolyte and porous gas-diffusion electrodes formed from a perovskite-structure ceramic, La/sub 0.8/Sr/sub 0.2/CoO/sub 3/. The transfer is effected by application of a small voltage (ca. 0.5 V) across each cell. Removal efficiencies of So/sub 2/ greater than 99% were achieved at current efficiencies near 100%. A preliminary economic analysis based on a 500-MW power plant burning 3.5% sulfur coal indicates less than 1 mil/kWh operating cost and less than $100/kW capital cost. These compare favorably with conventional and emerging FGD process costs of 25 mils/kWh and $300/kW.
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