A method for operating a combustion system to facilitate reducing
emissions from the system is provided. The method includes supplying an
aqueous selective reducing agent from an aqueous selective reducing agent
source to an atomizer that is directly coupled in flow communication with
the aqueous selective reducing agent source. The method also includes
atomizing the selective reducing agent in the atomizer, and injecting
atomized droplets of the selective reducing agent from the atomizer
directly into a transport stream of flue gas flowing within a temperature
zone defined within the combustion system.