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Main Title Evaluation of the impact of chlorine on mercury oxidation in a pilot-scale coal combustor, the effect of coal blending [electronic resource] /
Author Serre, Shannon D.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Air Pollution Prevention and Control Division,
Place Published Research Triangle Park, N.C.
Year Published 2009
Report Number EPA/600/R-09/021
OCLC Number 669991054
Subject Added Ent Coal-fired power plants--Environmental aspects--United States.; Mercury--Oxidation.; Chlorine.; Coal--Mixing.
Internet Access
Description Access URL
http://www.epa.gov/nrmrl/publications.html
http://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P10077UW.txt
Holdings
Library   Call Number Additional Info Location Date Modified
EJBM POD Internet only Headquarters Library/Washington,DC 10/26/2010
Collation 1 online resource ([27] p.) : digital, PDF file.
Notes Title from title screen (viewed: Sept. 16, 2010). "September 2009." "EPA/600/R-09/021." Includes bibliographical references (p. 5-1).
Contents Notes "Coal-fired power plants are a major source of mercury (Hg) released into the environment and the utility industry is currently investigating options to reduce Hg emissions. One control option is to utilize existing pollution control equipment such as wet flue gas desulfurization (FGD) scrubbers. The split (speciation) between chemical forms of mercury (Hg) species has a strong influence on the control and environmental fate of Hg emissions from coal combustion. The high-temperature coal combustion process releases Hg in elemental form (Hg0). A significant fraction of the Hg0 can be subsequently oxidized in the low-temperature, post-combustion environment of a coal-fired boiler. Relative to Hg0, oxidized Hg (Hg2+) is more effectively removed by air pollution control systems (APCS). For example, the water-soluble Hg2+ is much more easily captured than insoluble Hg0 in FGD units. Selective catalytic reduction (SCR) technology widely applied for reducing NOX emissions from power plants also affects the speciation of Hg in the coal combustion flue gases. Recent full-scale field tests conducted in the U.S. showed increases in Hg oxidation across the SCR catalysts for plants firing bituminous coals with sulfur (S) content ranging from 1.0 to 3.9%. However, plants firing subbituminous Powder River Basin (PRB) coals which contains significantly lower chlorine (Cl) and sulfur (S) content and higher calcium (Ca) content than those of the bituminous coals, showed very little change in mercury speciation across the SCR reactors. A field study conducted by EPRI showed blending of PRB coal with a bituminous coal (60% PRB/40% bituminous) resulted in increased Hg2+ from 45% at the SCR inlet to 93% at the outlet. Coal blending appears to be a potentially cost effective approach for increasing Hg oxidation for PRB coal-fired SCR systems."--Abstract
Author Added Ent
Lee, Chun Wai.
Corporate Au Added Ent National Risk Management Research Laboratory (U.S.). Air Pollution Prevention and Control Division.
PUB Date Free Form 2009
BIB Level m
Medium electronic resource
OCLC Time Stamp 20101013154533
Cataloging Source OCLC/T
Language eng
Origin OCLC
Type CAT
OCLC Rec Leader 03439nam 2200385Ia 45020