Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Reexamination Certificate
2011-03-08
2011-03-08
Vanoy, Timothy C (Department: 1734)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
C423S215500, C423S242100, C423S239100, C423S237000
Reexamination Certificate
active
07901647
ABSTRACT:
An apparatus and method for achieving increased NOxremoval efficiency from an emissions control portion of a fossil fuel fired boiler while controlling ammonia slip provides excess levels of ammonia above those levels conventionally employed in SCR and/or SNCR applications. The apparatus and methods comprise, in part, use of a NOxreduction system comprising at least one selective catalytic reduction system which receives ammonia in higher amounts than conventional practice from an upstream ammonia injection point, and an ammonia reduction system positioned downstream of one or more ammonia injection points and the NOxreduction system. The excess ammonia achieves increased NOxremoval, while the ammonia reduction system contains at least one ammonia destruction catalyst which permits the NOxreduction system to be operated at an increased NOxremoval efficiency without a corresponding increase in ammonia slip.
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Downs William
Guo Xiaoyu
Hiner Larry A.
Babcock & Wilcox Power Generation Group, Inc.
Marich Eric
Vanoy Timothy C
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