Gas-Phase Oxidation of Mercury by Bromine and Chlorine in Flue Gas

• DOI: 10.1021/ef200840c
• Publication Date: 2011-07-25T04:02:45Z
• Authors: Brydger Van Otten; Paula A. Buitrago; Constance L. Senior; Geoffrey D. Silcox
• Keywords: Mercury

Oxidized mercury species may be formed in combustion systems through gas-phase reactions between elemental and halogens, such as chorine or bromine. This study examines how bromine chlorine affect oxidation the gas phase. Experiments were conducted a bench-scale, laminar, methane-fired (300 W), quartz-lined reactor, which composition (HCl, HBr, NOx, SO2) was varied. In experiments, postcombustion gases quenched from flame temperature to about 350 °C then speciated measured using wet conditioning system continuous emission monitor (CEM). Bromine shown much more effective postflame, homogeneous of than chlorine, on an equivalent molar basis. The addition NO (up 400 ppmv) had no impact by SO2 effect at concentrations below ppmv; some increase observed ppmv higher. caused minor increases extent results this can used understand relative importance systems.