Patent ID: 6422858
Filing Date: 2002-07-23
Classification: F23C,F23D,F23M

Abstract:
A low NOx forming burner apparatus for burning liquid and gaseous fuels adapted to be connected to a furnace space comprising:a housing having an open discharge end attached to said furnace space and a closed opposite end; means for introducing a controlled quantity of air into said housing and into said furnace space attached to said housing; a combustion compartment disposed within said housing for providing a primary combustion zone therein having an open inlet end for receiving a portion of the air introduced into said housing as primary air and an open discharge end adjacent to said open discharge end of said housing, said combustion compartment being smaller than said housing whereby a portion of said air introduced into said housing passes through an annular space between the exterior of said compartment and the interior of said housing and is discharged from said annular space at the discharge ends of said housing and said compartment as secondary air; a liquid fuel nozzle attached to said housing for connection to a source of liquid fuel and for discharging liquid fuel into said primary combustion zone within said compartment so that said liquid fuel mixes with primary air therein and is combusted therein whereby flue gases are formed therefrom and are discharged into said furnace space; at least one primary gaseous fuel nozzle attached to said housing for connection to a source of gaseous fuel and for discharging primary gaseous fuel into said primary combustion zone within said compartment so that said gaseous fuel mixes with primary air therein, is combusted therein whereby flue gases are formed therefrom and are discharged into said furnace space; four secondary gaseous fuel nozzles attached to said housing for connection to a source of gaseous fuel and for discharging secondary gaseous fuel into said furnace space which mixes with flue gases and said secondary air therein and is combusted therein, said secondary fuel nozzles being equally spaced within and around said annular space at the discharge ends of said housing and said combustion compartment; and four spaced air baffle members positioned in said annular space adjacent to said secondary gaseous fuel nozzles to shield said fuel nozzles and to cause said secondary air to be discharged from said annular space by way of openings between said baffle members.