Patent ID: 6875008

Claim:
A burner assembly comprising, a) a burner tile having a down stream edge, an outside surface and defining an interior space; b) at least one venture having an inlet and an outlet, where the outlet is downstream of the inlet and disposed in the interior space of the tile; c) a primary air control system to control the amount of air entering the inlet of the venture; d) at least one primary fuel tip disposed in close proximity to the inlet of the venture, where the primary fuel tip supplies fuel to be mixed with the primary air within the venture to form a premix; e) secondary fuel tips mounted on or near the outside surface of the tile to supply secondary fuel for combustion in a first combustion zone and a second combustion zone; f) a secondary air chamber defined by a space upstream of the burner tile and downstream of the venture inlet; and g) at least one secondary air opening in fluid communication with the interior space of the tile and with the secondary air chamber, where the secondary air chamber supplies secondary air that mixes with the premix exiting the outlet of the venture and part of the secondary fuel prior to combustion in the first combustion zone.