Dual fuel gas-liquid burner

A staged-air dual-fuel burner for the combustion of gaseous and non-gaseous fuels and air in a furnace, said burner comprising:

• (a) a primary air chamber for providing at least a portion of the combustion air;
• (b) a burner tube having an upstream end and a downstream end;
• (c) a fuel orifice located adjacent the upstream end of said burner tube, for introducing gaseous fuel into said burner tube;
• (d) a burner tip having an outer diameter mounted on said downstream end of said burner tube adjacent a first opening in the furnace, so that combustion of the gaseous fuel takes place downstream of said burner tip producing a gaseous fuel flame;
• (e) at least one non-gaseous fuel gun, said at least one non-gaseous fuel gun having at least one fuel discharge orifice, said at least one non-gaseous fuel gun being radially positioned beyond said outer diameter of said burner tip, the radial positioning of said non-gaseous fuel guns enables the combustion of the gaseous fuel to stabilize non-gaseous fuel combustion, wherein said at least one non-gaseous fuel gun comprises a plurality of non-gaseous fuel guns for supplying non-gaseous fuel;
• (f) at least one air port in fluid communication with a secondary air chamber for supplying a second portion of fresh or ambient air;
• and
• (g) a peripheral tile which peripherally surrounds said burner tip, said peripheral tile having a plurality of radially disposed openings adjacent said burner tip for placement of said plurality of non-gaseous fuel guns within said openings of said peripheral tile, wherein each opening of said peripheral tile is sized to provide a minimal gap between said peripheral tile and each said non-gaseous fuel gun effective for reducing excess combustion air;
• wherein said at least one non-gaseous discharge orifice of said at least one non-gaseous fuel gun is positioned so that the non-gaseous fuel is injected into the gaseous fuel flame, whereby a portion of the non-gaseous fuel flame vaporizes prior to combustion and stabilizes the non-gaseous fuel flame.