Method and apparatus for reducing "ammonia slip" in SCR and/or SNCR NOx removal applications
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United States of America Patent
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Sep 16, 2003
Grant Date -
Nov 15, 2001
app pub date -
Jul 23, 2001
filing date -
Oct 12, 1999
priority date (Note) -
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Abstract
A method and apparatus for reducing the amount of unused ammonia ('ammonia slip') in instances where ammonia is provided to SNCR and/or SCR processes for reducing NOx pollution in flue gas produced by a fossil fuel burning facility. Such a facility incorporates a rotary regenerative heat exchanger (i.e. an air preheater and/or a gas to gas preheater) for absorbing heat from the gas flow on one side of the heat exchanger, and releasing such absorbed heat to heat the gas flow on the other side of the heat exchanger. The invention herein includes absorbent/desorbent media carried by at least some of the elements of the heat exchanger. The media is active to adsorb at least a portion of the ammonia slip after NOx is treated, and before the gas flow is exhausted to the environment, and to desorb essentially an equilibrium portion of such adsorbed ammonia into gas flow upstream from the providing of ammonia for the SNCR/SCR process.
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