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PILOT PLANT TESTING OF ELEMENTAL MERCURY RE-EMISSION FROM WET SCRUBBERS
Citation:
CHANG, J. C. AND Y. ZHAO. PILOT PLANT TESTING OF ELEMENTAL MERCURY RE-EMISSION FROM WET SCRUBBERS. In Proceedings, EPRI-EPA-DOE-AWMA Power Plant Air Pollutant Control Mega Symposium, Baltimore, MD, August 28 - 31, 2006. U.S. Environmental Protection Agency, Washington, DC, 2006.
Description:
A pilot-scale wet lime/limestone flue gas desulfurization scrubber system was designed to conduct mercury emission control research. The first tests focused on investigating the phenomenon of Hgo re-emission from wet scrubbers with a specific objective of developing a Hgo re-emission model that can be used to predict the transient and steady state Hgo concentration increases across a scrubber. Pilot plant tests were conducted with flue gas generated from a natural gas furnace doped with 2000 ppm sulfur dioxide. Mercuric chloride (HgCl2) solution was pumped to the scrubber at a controlled rate to simulate the absorption of Hg2+. It was found that the pilot-scale scrubber system can be used to simulate Hgo re-emissions. Elevated Hgo concentrations were detected both in the scrubber effluent flue gas and the hold tank air reflecting Hgo re-emissions in both places. The Hgo re-emission rate and pattern can be simulated by a first-order reaction model. When the HgCl2 feed was terminated, Hgo release in the scrubber continued for more than 2 h as the model predicted. In addition, significant Hgo re-emission outside of the scrubber was detected.