Abstract
Gaseous alkali metal compounds transported form a pressurized fluidized-bed coal combustor (PFBC) to a gas turbine might cause hot corrosion of turbine hardware. Activated bauxite was found to be a very effective granular sorbent for use in granular-bed filters for removing gaseous alkali metal compounds from simulated hot flue gas of PFBC. Also, activated bauxite was demonstrated to be easily and effectively regenerated for reuse by a simple water-leaching process. Experimental results are presented for cyclic experiments showing the regenerability of water-leaching of activated bauxite on which NaCl vapor or KCl vapor was sorbed. Observed physical changes and particle attrition of activated bauxite as a result of regeneration are discussed. The sorption mechanisms of the regenerated activated bauxite are related to the chemical compositions of the leachate.
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