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STUDY OF SPECIATION OF MERCURY UNDER SIMULATED SCR NOX EMISSION CONTROL CONDITIONS
Citation:
Lee*, C W., R K. Srivastava*, S. B. Ghorishi, T. W. Hastings, AND F. M. Stevens. STUDY OF SPECIATION OF MERCURY UNDER SIMULATED SCR NOX EMISSION CONTROL CONDITIONS. Presented at DOE/EPRI/EPA/A&WMA Power Plant "Mega" Symposium, Washington, DC, 19-22 May 2003.
Description:
The paper focuses on the impact of SCR on elemental mercury (Hg0) oxidation. It describes the results of bench-scale experiments conducted to investigate Hg0 oxidation in the presence of simulated coal combustion flue gases and under SCR reaction conditions. Flue gas mixtures with different concentrations of hydrogen chloride (HCl) and sulfur dioxide (SO2) for simulating the combustion of bituminous coals and sub-bituminous coals were tested in these experiments. The effects of HCI and SO2 in the flue gases on Hg0 oxidation were studied under SCR reaction conditions obtained with a commercial vanadia-titania SCR catalyst. It was observed that HCI is the most critical flue gas component causing conversion of Hg0 to Hg2+ under SCR reaction conditions. The importance of HCI for Hg0 oxidation found in the present study provides a strong scientific base for the apparent coal-type dependence observed in Hg0 oxidation occurring across SCR reactors in the field.