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STUDY OF MERCURY OXIDATION BY SCR CATALYST IN AN ENTRAINED-FLOW REACTOR UNDER SIMULATED PRB CONDITIONS
Citation:
LEE, S., C. LEE, S. D. SERRE, Y. ZHAO, J. KARWOWSKI, AND T. W. HASTINGS. STUDY OF MERCURY OXIDATION BY SCR CATALYST IN AN ENTRAINED-FLOW REACTOR UNDER SIMULATED PRB CONDITIONS. Presented at International Conference on Air Quality, Arlington, VA, September 19, 2005.
Description:
A bench-scale entrained-flow reactor system was constructed for studying elemental mercury oxidation under selective catalytic reduction (SCR) reaction conditions. Simulated flue gas was doped with fly ash collected from a subbituminous Powder River Basin (PRB) coal-fired boiler along with other coal combustion flue gas components such as sulfur dioxide, nitrogen oxides, hydrogen chloride, reductant ammonia for nitrogen oxides reduction reaction over selective catalytic reduction catalyst, and trace elemental mercury. The effects of hydrogen chloride concentration, SCR operating temperature, and feed rate of PRB coal fly ash on elemental mercury oxidation were studied. It was concluded that hydrogen chloride plays an important role of providing a source of chlorine for elemental mercury oxidation. Our observations suggest that elemental mercury oxidation may occur near the exit region of the SCR reactors in the field. Passage of flue gas through SCR systems without ammonia injections, such as during the non-ozone season, may also impact mercury speciation and capture in the flue gas.