Apparatus, system, and method for reducing NO x emissions...

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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C060S299000

Reexamination Certificate

active

08074445

ABSTRACT:
Various embodiments of an apparatus, system, and method are disclosed for reducing NOxemissions on an SCR catalyst. For example, according to one representative embodiment, an apparatus for reducing NOxemissions in an engine exhaust includes a NOxreduction target module that is operable to determine a NOxreduction requirement that includes an amount of NOxin the exhaust gas stream to be reduced on a selective catalytic reduction (SCR) catalyst. The apparatus also includes an ammonia target module that is operable to determine an ammonia addition requirement that includes an amount of ammonia added to the exhaust gas stream to achieve the NOxreduction requirement. The apparatus also includes a reductant target module that has a hydrolysis module and an inverse hydrolysis module. The hydrolysis module is operable to determine a predicted amount of ammonia and isocyanic acid entering the SCR catalyst. The inverse hydrolysis module is operable to determine a reductant injection requirement based at least partially on the predicted amount of ammonia and isocyanic acid entering the SCR catalyst.

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