Patent ID: 6565361
Filing Date: 2003-05-20
Classification: F23C,F23D

Abstract:
A method of discharging a substantially stoichiometric mixture of fuel gas and air into a furnace wherein said mixture is burned and flue gases having a low NOx content are formed therefrom comprising the steps of:(a) mixing a first portion of said fuel gas with a first portion of said air to form a primary fuel gas-air mixture; (b) discharging said primary fuel gas-air mixture into a primary burning zone in said furnace from at least one primary fuel gas-air mixture discharge location surrounded by a wall which extends into said furnace; (c) mixing a second portion of said fuel gas and a second portion of said air to form a secondary fuel gas-air mixture; and (d) discharging said secondary fuel gas-air mixture into a secondary burning zone in said furnace from at least one secondary fuel gas-air mixture discharge location adjacent to an exterior side of said wall at a velocity whereby said secondary fuel gas-air mixture is not ignited and burned until said mixture spreads over said exterior side of said wall, mixes with flue gases in said furnace and flows beyond said wall.