Patent ID: 8794960

Claim:
A low NO x burner for use with a furnace having a wall and a combustion chamber, the burner comprising: an elongated tube for connection to a combustion air supply, attached to the wall and extending a first distance from the wall into the combustion chamber, a combustion air spinner defining an axis of the burner and connected to the elongated tube at the first distance so that upon installation of the elongated tube on the wall a downstream end of the spinner is inside the combustion chamber and remote from the furnace wall, a plurality of elongated air ports arranged around the elongated tube and connected to the combustion air supply and extending from the wall into the combustion chamber, downstream discharge ends of the air ports being spaced from the furnace wall a second distance, the second distance being less than the first distance, a plurality of first fuel gas spuds having fuel gas discharge orifices in a vicinity of a downstream end of the spinner, a plurality of second fuel gas spuds, each disposed between each adjacent pair of air ports, adapted to be connected to a fuel gas source, arranged relative to the axis proximate radially outermost portions of the air ports and having fuel discharge orifices downstream of the furnace wall and upstream of the discharge ends of the air ports, such that the second fuel gas spuds are not located in a combustion air flow, and wherein each air port forms an elongated conduit, and a third fuel gas spud arranged in each conduit, and wherein the third fuel gas spud is positioned inside the conduit at a location upstream of the discharged end of the conduit.