초록 ▼

A system is provided for reducing the amount of nitrogen oxides produced by conventional gas-fired boilers, water heaters, or other heat transfer devices by diluting the fuel gas with an inert gas. The system includes a mixing unit or region for diluting fuel gas with an inert gas before the fuel ga

A system is provided for reducing the amount of nitrogen oxides produced by conventional gas-fired boilers, water heaters, or other heat transfer devices by diluting the fuel gas with an inert gas. The system includes a mixing unit or region for diluting fuel gas with an inert gas before the fuel gas is supplied to a burner assembly of a combustion device. Flue gas from the combustion chamber of the combustion device may be used to dilute the fuel gas.

대표청구항 ▼

A method of reducing the amount of nitrogen oxides produced and discharged by a boiler which includes a burner assembly, a combustion chamber, a flue for exhausting combustion product created by the burner assembly from the combustion chamber, and fuel supply means for supplying a fuel gas to the bu

A method of reducing the amount of nitrogen oxides produced and discharged by a boiler which includes a burner assembly, a combustion chamber, a flue for exhausting combustion product created by the burner assembly from the combustion chamber, and fuel supply means for supplying a fuel gas to the burner assembly, the method comprising the steps of: providing a housing having a first inlet, a second inlet, and an outlet, removing a portion of the combustion product from the flue, introducing the portion of the combustion product removed from the flue into the housing through the first inlet, introducing a fuel gas into the housing through the second inlet to produce a mixture of combustion product and fuel gas containing at least 30% combustion product, connecting the output of the housing to the burner assembly to supply the mixture of combustion product and fuel gas to a firing head of the burner assembly, monitoring the pressure of the portion of the combustion product delivered to the housing from the flue, and stopping removal of the combustion product from the flue in response to the pressure falling below a predetermined level.