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The acidification of the aqueous phase induced by the use of an aluminium additive (sulphate), to increase the SO 2 trapping efficiency in flue gas desulphurisation (FGD) systems, results in significant differences in the speciation and partitioning of elements between the aqueous and solid phases of gypsum slurries from two Spanish coal-fired power plants (PP1 and PP2). The Al-additive increases...
Water re-circulation to the scrubber and co-combustion of coal with petroleum coke are the most significant factors that affect the retention capacity for trace elements in a power plant equipped with a forced-oxidation flue gas desulphurisation (FGD) system. The water re-circulation favours the progressive saturation of most elements in the gypsum slurry with the subsequent increase in emission by...
The abatement capacity of trace inorganic elements was studied in a large Pulverized Coal Combustion (PCC) power plant equipped with a wet limestone Flue Gas Desulphurisation (FGD) system. High proportions of most elements were retained as fly ash as consequence of the efficiency of the electrostatic precipitator (ESP, 99.6% of fly ash) and slag (11%). The most volatile elements, such as S and F are...
The enrichment of inorganic trace pollutants in re-circulated water streams was studied at two power plants equipped with wet limestone Flue Gas Desulphurisation (FGD) system from the first re-circulation cycle of water up to the start of sampling campaigns. To elucidate the enrichment of inorganic trace pollutants as result of water re-circulation, a partial and total mass balances were undertaken...
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