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Simultaneous Removal of SO2, NOx, and Hg from Coal Flue Gas Using a NaClO2-Enhanced Wet Scrubber
Citation:
HUTSON, N. D., R. Krzyzynska, AND R. K. SRIVASTAVA. Simultaneous Removal of SO2, NOx, and Hg from Coal Flue Gas Using a NaClO2-Enhanced Wet Scrubber. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. American Chemical Society, Washington, DC, 47(16):5825-5831, (2008).
Impact/Purpose:
journal article
Description:
On March 10,2005, the EPA issued the Clean Air Interstate Rule which, when fully implemented in 2015, will reduce sulfur dioxide and nitrogen oxides emissions in the eastern United States by over 70% and 60%, respectively, from 2003 levels. On March 15, 2005, the Clean Air Mercury Rule was issued for control of mercury from coal-fired electric utility boilers. On February 8, 2008 courts disagreed with the agency's regulatory approach to mercury control and vacated CAMR. Still there is great interest in technologies for mercury emissions control. Wet flue gas desulfurization technologies, particularly limestone-based wet scrubbers, have been shown to reliability provide in excess of 95% removal S02 removal efficiency. It is estimated that, in 2020, about 60% of the total coal-fired capacity will utilize some sort of wet-FGD technology. While wet-FGD scrubbers are installed specifically for S02 control, they may also effectively remove oxidized forms of mercury from flue gas. In fact, most of the initial CAMR mercury emission reductions were expected to be met as a co-benefit of other air pollution control technologies such as wet-FGD scrubbers. Deeper emission limits will likely require additional Hg-specific control technologies, such as activated carbon injection.
