In order to study the emission characteristics of heavy metal elements(Pb

As) from an ultra-low emission coal-fired power plant in China

the EPA Method 29 recommended by American Environmental Protection Department was used to carry out parallel sampling analysis for the flue gas in front of the selective catalytic reduction(SCR) denitration system

in front of and behind the electrostatic precipitator(ESP) and the wet electrostatic precipitator(WESP). Moreover

the feed fuel

bottom ash

ESP ash

limestone slurry

gypsum and desulfurization wastewater were also sampled and analyzed. Then

the distribution proportions and migration/emission characteristics of Pb and As in by-products of the coal combustion were obtained based on mass balance calculation. The results indicate that

the Pb and As in the fuel mainly migrates into the ESP ash and bottom slag. The particulate-bound Pb and As are the main existing forms of heavy metals in flue gas in in front of the ESP

which account for over 98%. The synergistic removal efficiency of Pb and As by the pollutant control device(APCDs) both reaches higher than 99%. The mass concentration of Pb and As in flue gas at the WESP outlet are 2.71 mg/m~3 and 0.18 mg/m~3. The emission factor of Pb and As is 0.91×10~(-12) g/J and 0.06×10~(-12) g/J. Therefore

the APCDs equipped in the ultra-low emission coal-fired power plants can effectively control the emission of Pb and As in flue gas.