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EFFECT OF SELECTIVE CATALYTIC REDUCTION ON MERCURY, 2002 FIELD STUDIES UPDATE
Citation:
Laudal, D. L. EFFECT OF SELECTIVE CATALYTIC REDUCTION ON MERCURY, 2002 FIELD STUDIES UPDATE. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-04/032, 2003.
Impact/Purpose:
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Description:
The report documents the 2002 "Selective Catalytic Reduction Mercury Field Sampling Project." An overall evaluation of the results from both 2001 and 2002 testing is also provided. The project was sponsored by the Electric Power Research Institute (EPRI), the U.S. Department of Energy (DOE) National Energy Technology Laboratory, and the U.S. Environmental Protection Agency's (EPA) National Risk Management Research Laboratory. Mercury measurements have been completed at six different power plants, four in 2001 and two in 2002, with selective catalytic reduction (SCR). In addition, two of these plants tested in 2001 were tested again in 2002 for a total of eight data sets.
Results indicate that SCRs can increase Hg oxidation and improve Hg removal in the downstream FGD, and is especially effective for bituminous coal applications where 90+% Hg2+ is possible at the particulate control device inlet. The three bituminous coal-fired power plants with wet flue gas desulfurization (FGD) systems achieved mercury (Hg) removals of 84%?92% with SCR operation, as compared with 43%?51% without SCR operation.
It is important to note that these findings are based on a relatively small data set and, thus, should be considered preliminary rather than final conclusions. For example, two of the three FGDs tested were magnesium-lime systems, and the third FGD was a venturi scrubber; thus the combined effect of SCR and the most common FGD design of a limestone, forced-oxidation system has yet to be evaluated.
Additional field measurements are being conducted in 2003. To evaluate the effect of coal properties, measurements are planned at a pulverized-coal-fired power plant burning a Powder River Basin (PRB) coal, with a second PRB site to be tested around January 2004. Additional tests to evaluate catalyst aging effects are planned at the two power plants that indicated significant Hg oxidation in the 2001 tests and were retested in 2002. This report should be viewed as work in progress.
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EFFECT OF SELECTIVE CATALYTIC REDUCTION ON MERCURY, 2002 FIELD STUDIES UPDATEEFFECT OF SELECTIVE CATALYTIC REDUCTION ON MERCURY, 2002 FIELD STUDIES UPDATE (PDF, NA pp, 6419 KB, about PDF)