Mercury capture by boiler modifications with sub-bituminous coals

► Impacts of boiler parameters on Hg emissions were investigated at a coal-fired power plant. ► The plant was burning low chlorine (Cl) PRB coal. ► The Hg reduction at the stack was lower than the power plants which burn high Cl coals. ► OHM and mercury SCEM measurements showed excellent agreement. ► Boiler modifications resulted in 34.5% reduction in HgT emissions in the stack.