Combined cycle power generation plants fired by low Btu gasified coal will be among the most efficient, environmentally acceptable means of coal-based power generation available. A major cost of producing clean gasified fuel from high sulfur coal is associated with H2S removal and conversion to sulfur. A new approach now under development to H2S removal is based on an immobilized HC03~7C032_ membrane through which facilitated transport of H2S occurs. The membrane has sufficiently high K2S permeability to be a candidate for economical industrial application. A membrane configuration has been devised which provides a degree of H2S/C02 selectivity not available with conventional hot carbonate scrubbers. Thus the prognosis for an economical, efficient membrane H2S scrubber is favorable, although much development has yet to be done to prove the viability of the concept.
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