Many utilities are actively seeking efficient, cost-effective technologies forcontrolling multiple pollutants including mercury emitted from power plants. Datasuggest that combustion staging technologies can increase the "natural" ability offly ash to remove mercury. A preliminary evaluation of mercury reduction inreburning was conducted in a 255 MW wall- fired boiler equipped with a cold-sideESP and wet scrubber and firing bituminous coal. Focus of the evaluationprogram was on optimization of mercury removal across the ESP. Testingdemonstrated that without the reburning system in operation, mercury emissionswere reduced by approximately 40% at the ESP outlet. When optimized reburningwas introduced, mercury emissions were reduced by 80% at the ESP outlet.Simultaneously, Nox emissions were reduced by 70%, from 0.45 lb/MMBtu to0.13 lb/MMBtu.
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