Device for returning flue gases to the burner

摘要

The invention relates to a device for returning flue gases to the burner via a flue-gas return line for the purpose of reducing the NOx values at the burner of a water heater or a steam boiler installation. In this device, an axial impeller 7, which has at least two blades designed according to the propellor principle, is drivably arranged in the flue-gas return line 3. The axial impeller 7 may be driven in this arrangement by an electric motor 12 or a water turbine 5. <IMAGE>