Nitrogenous sorbent for coal combustion
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United States of America Patent
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-
Dec 23, 2008
Grant Date -
Jun 21, 2007
app pub date -
Dec 20, 2006
filing date -
Dec 21, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Sorbent compositions for coal contain nitrogenous components that reduce the level of mercury and/or sulfur emitted into the atmosphere upon combustion. The sorbent compositions are added directly to the fuel before combustion; directly into the fireball during combustion; are added to the fuel before combustion and into the flue gas post combustion zone; or are added completely into the flue gas post combustion zone, preferably where the flue gas temperature is at least 500.degree. C. The sorbent compositions comprise a source of nitrate ions, a source of nitrite ions, or a combination of nitrate and nitrite sources. The sorbents are added as solids or as solutions in water. In various embodiments, the sorbent compositions further comprise a source of halogen such as bromide.
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