Patent ID: 6383461
Filing Date: 2002-05-07
Classification: F23C,F23L

Abstract:
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.