초록 ▼

Methods and apparatus for reducing the content of nitrogen oxides in the flue gases produced by the combustion of fuel gas and combustion air introduced into a burner connected to a furnace are provided. The methods basically comprise the steps of conducting the combustion air to the burner, providi

Methods and apparatus for reducing the content of nitrogen oxides in the flue gases produced by the combustion of fuel gas and combustion air introduced into a burner connected to a furnace are provided. The methods basically comprise the steps of conducting the combustion air to the burner, providing a chamber outside of the burner and furnace for mixing flue gases from the furnace with the fuel gas, discharging the fuel gas in the form of a fuel jet into the mixing chamber so that flue gases from the furnace are drawn into the chamber and mixed with and dilute the fuel gas therein and conducting the resulting mixture of flue gases and fuel gas to the burner wherein the mixture is combined with the combustion air and burned in the furnace.

대표청구항 ▼

1. A method of reducing the content of nitrogen oxides in flue gases produced by the combustion of an at least substantially stoichiometric mixture of fuel gas and combustion air introduced into a burner connected to a furnace comprising the steps of:(a) conducting said combustion air to said burner

1. A method of reducing the content of nitrogen oxides in flue gases produced by the combustion of an at least substantially stoichiometric mixture of fuel gas and combustion air introduced into a burner connected to a furnace comprising the steps of:(a) conducting said combustion air to said burner; (b) providing a chamber outside of said burner and furnace for mixing flue gases from said furnace with said fuel gas, said chamber including a fuel gas jet-forming nozzle and a venturi and mixing compartment therein; (c) discharging said fuel gas in the form of a fuel gas jet into said mixing chamber by way of said fuel gas jet-forming nozzle so that flue gases from said furnace are drawn into said chamber and mix with and dilute said fuel gas in said venturi and mixing compartment therein; and (d) conducting the mixture of flue gases and fuel gas formed in step (c) to said burner wherein said mixture is combined with said combustion air and burned therein and in said furnace.