Mercury emissions from a pulverized coal-fired boiler(250MW)equipped with SCR,cold side-ESP+FF and wet FGD(limestone)in North China were characterized by sampling the flue gas at four locations(SCRinlet,ESPinlet,FFoutlet and FGDoutlet)with the Ontario Hydro Method(OHM).Meanwhile,the feed coal,bottom ashes,fly ash,limestone,gypsum and effluent from the FGD were also collected and analyzed for Hg.The result showed that Hg in the coal averaged at 139 ng/g,and 99%of Hg in coal was evaporated during the combustion process.The configurations of air pollution control devices have high Hg removal efficiency,with only 4%of Hg in the coal was ultimately released into the ambient atmosphere.Total Hg in the flue gas at FGDoutlet averaged at 0.87 μg/m3,with 86%in Hg0,13%in Hg2+,and 1%in Hgp.The total mercury concentrations were much lower than the national emission standard for Hg for thermal power plants in China,namely,30 μg/m3.The Hg emission factor from this power plant was equivalent to 6.3 mg Hg/t coal or 3.06 μg Hg/kW.h,this value is much lower than many other coal-fired power plants.The SCR device converted 90%of Hg0 into Hg2+,which is in favor of been trapped by the downstream dust collector and WFGD.The cold-side ESP and FF removed almost all the particulate mercury,while wet FGD only removed Hg2+.