Mercury emissions from a coal-fired power plant in Japan

摘要: Abstract The emissions study for mercury was conducted at a 700 MW coal-fired plant the combustion of three types coal with concentrations 0.0063, 0.0367 and 0.065 mg/kg. power is equipped cold-side electrostatic precipitator wet type flue gas desulfurization system. During full load operation boilers, samples input output streams such as coal, ash, ESP ash post-ESP particulates were collected. Hg in solid measured by cold-vapor atomic absorption spectrometry (AAS) after appropriate preparation acid digestion. Gaseous collected using mixed solution potassium permanganate sulfuric AAS. results used to examine: (1) overall mass balances; (2) relative distribution plant; (3) equilibrium species MALT-2 calculation program; (4) stack emissions. balances estimated this 100, 138 89%, respectively, coals. Total 1.113, 0.422 0.712 μg m 3 N , More than 99.5% gaseous form proportion particulate extremely low. ESP, FGD Stack ranged from 8.3 55.2%, 13.3 69.2% 12.2% 44.4%, respectively. indicated that factors other concentration coals efficiency pollution control devices might affect plant. calculated MALT2 program suggest it necessary consider condensation mechanism interpret on variations removal efficiencies ESP.