Model-based tuning of ammonia distribution and control for...

Details Model-based tuning of ammonia distribution and control for... Model-based tuning of ammonia distribution and control for...

2009-07-24

2010-11-02

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423SDIG018, C422S108000, C422S111000

Reexamination Certificate

active

07824636

ABSTRACT:
A method and system for reducing the amount of nitrogen oxides (NOx) in a combustion gas waste stream by (1) analyzing the waste stream to determine the amount of NOx; (2) determining the stoichiometric amount of ammonia required to reduce the NOxconcentration down to a required level or less; (3) determining the flow rate profile of NOxcomponents across the combustion gas waste stream upstream of an ammonia injection grid; (4) selecting specific locations within the ammonia injection grid to activate ammonia valves; (5) injecting controlled amounts of ammonia vapor into the gas stream at grid locations corresponding to the location of NOxin the gas stream; and (6) treating the gas stream using a selective catalytic reduction unit to reduce the amount of NOxdown to acceptable levels.

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