Abstract
Combustion experiments of anthracite with different amounts of CaCl2 and NH4Cl additives were conducted in a 6 kW circulating fluidized bed (CFB) combustor. Mercury transformation resulted by the addition of CaCl2 and NH4Cl, and the side effects on NO emission were explored. Mercury species existing in flue gas and fly ash were determined, respectively, by the Ontario Hydro Method (OHM) and thermal decomposition experiments, to explore the mercury transformation pathway and mechanism. Results show that the initial Hg0 and Hg2+ emission concentrations in flue gas are 2.276 and 2.572 μg/Nm3, respectively, as the anthracite is combusted in the CFB combustor. The proportion of gas-phase mercury is 22.65% and that of particle-bound mercury is 77.35%. The gas-phase mercury emission concentration decreases continuously with the increase of CaCl2 or NH4Cl addition amount and is also affected by the unburned carbon content of fly ash. Mercury compounds species existing in fly ashes are mainly HgCl2 and HgS with li...
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