METHODS AND SYSTEMS FOR ENHANCING MERCURY, SELENIUM AND HEAVY METAL REMOVAL FROM FLUE GAS
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United States of America Patent
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Issued Date -
May 21, 2009
app pub date -
Jul 2, 2008
filing date -
Nov 21, 2007
priority date (Note) -
Abandoned
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Abstract
A method for treating flue gas may include adding iron to a slurry in a ratio between approximately 20-to-1 and 5000-to-1 by weight of iron to a weight of mercury, selenium or other heavy metal to be removed from the flue gas, and contacting the slurry with the flue gas in a flue gas desulfurization system. A system for treating flue gas may include a scrubber, a slurry tank, and a water source. Water and limestone may be combined in the slurry tank to form a limestone slurry. At least a portion of the limestone slurry may be used to treat flue gas in the scrubber. Iron may be added to at least a portion of the limestone slurry used to treat flue gas in the scrubber. The iron used in either the method or system may be a ferrous or ferric salt, or elemental iron.
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