Patent ID: 7498009

Claim:
The SUVR method for reducing or substantially eliminating oxides of nitrogen (NO x ) from an effluent gas stream between 300-800° K and that contains oxygen gas (O 2 ) by reacting NO x with the amidogen radical (NH 2 *) to form to harmless nitrogen gas (N 2 ) and water vapor (H 2 O), the method including the steps: a) providing a source of ultraviolet radiation with output between 180 nm and 220 nm associated with a duct containing the effluent stream, or streams, b) mixing ammonia or an ammonia-based reagent with said stream, upstream of said ultraviolet radiation source so that the variance is within +15/−5% of stoichiometric concentration, c) causing said ultraviolet radiation source to irradiate the stream with effective wavelength band and intensity flux sufficient to dissociate the ammonia molecules (NH 3 ) to the amidogen radicals (NH 2 *) and to excite and dissociate NO x molecules to promote the (NO+NH 2 *) to (N 2 +H 2 O) reduction reaction, d) and controlling the rate of ammonia or ammonia based reagent added to said stream including measuring upstream NO x and downstream NO x and/or NH 3 slip.