Multi-stage process for SCR of NOx

Details Multi-stage process for SCR of NOx Multi-stage process for SCR of NOx

2007-04-03

2007-04-03

Johnson, Edward M. (Department: 1754)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

Reexamination Certificate

active

10725057

ABSTRACT:
A selective catalytic reduction apparatus has at least first and last catalyst layers in series for reducing nitrogen oxides in a flue gas, at least one interstage heat exchanger located after the first layer and before the last layer, that lowers flue gas temperature, and that acts as a mixing body to lower the standard deviation of the NH3/NO ratio entering catalyst layers after the first catalyst layer, thus providing better consumption of both ammonia and NOx in the reactor than would be achieved in the absence of the at least one interstage heat exchanger.

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“Enhance Ammonia Distribution for Maximum SCR Performance”, by Ralf Sigling, Cindy Khalaf, Edward Healy, Institute of Clean Air Companies, Forum 2003, Nashville, TN, Oct. 14-15, 2003.

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