The processFlue gas recycle (FGR) is a proven means of reducing NOx emissions. FGR systems divert a portion of the cooled flue gas leaving the boiler to be mixed with the combustion air and fuel gas entering the burner. In the EPR waste to energy plants, recycle of the flue gas also helps to control the temperature of the hot gasses entering the boiler. This proprietary design helps reduce fouling of the boiler tubes and extends boiler service life.