20 Years of Mercury Re-emission – What Do We Know?

20 Years of Mercury Re-emission – What Do We Know?

Presented at the: Power Plant Pollutant Control and Carbon Management “MEGA” Symposium
August 1-18, 2016
Baltimore, MD

Mandar Gadgil - The Babcock & Wilcox Company, Barberton Ohio, USA


While conducting fundamental research in the 1990s, Babcock & Wilcox (B&W) observed a wide range of mercury emission collection rates across the wet flue gas desulfurization (FGD) systems based on the type of particulate collector which was positioned upstream of the gas flow. The term ‘mercury re-emission’ was used to describe the phenomenon of a higher concentration of elemental mercury exiting the absorber when compared to what was entering the absorber. This paper will review the experience and knowledge gained as the industry more clearly understands what is necessary for achieving Mercury and Air Toxics Standards (MATS) limits when a wet FGD system is part of the installed air quality control system.

Results from several installations will show current costs of compliance, along with the various operational strategies to utilize a wet FGD for mercury control.

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