Mercury Emissions Control Technology Selection – Let Installed Air Quality Control System (AQCS) Equipment Guide Technology Choice

Mandar Gadgil (The Babcock & Wilcox Company) – Lead
Steven Feeney (The Babcock & Wilcox Company)


A variety of technologies are available for mercury emissions reduction from coal-fired power plant stack gas. Some of the most common technologies are: 1) halogen addition to the coal for mercury oxidation, with subsequent capture; 2) various sorbent additions to the coal and/or injections into the flue gas; and 3) addition of chemicals and/or sorbents into the wet flue gas desulfurization (FGD) absorbers or dry FGD vessels. These technology choices are driven by the equipment in place. One approach would be favored for a plant having only a cold-side electrostatic precipitator (ESP) and no FGD, whereas another would be more effective for a dry FGD with a fabric filter baghouse. Data will be presented from a number of tests conducted during the past few years showing how the technology choice was driven by the site-specific conditions of each plant. Cost comparison analysis will be presented for different technologies for mercury emissions compliance. Finally, data will also be presented from recent testing using the electrochemical noise (ECN) probe technique to determine the rate of air heater corrosion when adding halogen to coal for mercury oxidation.

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