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Abstract Power plant generates electricity as well as high temperature waste heat. NOx is main pollutant in power plant flue gas. NOx reduction reaction is expected to happen in given duct section. Selective non-catalytic reduction (SNCR) method is selected to control NOx level. SNCR requires no modification on duct geometry and this method is more cost-effective compared to other NOx reduction systems. Computational fluid dynamics (CFD) technique is employed to simulate flue gas flow and mass and heat transports with an injection of droplets.