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A burner assembly combines oxygen and fuel to produce a flame. The burner assembly includes an oxygen supply tube adapted to receive a stream of oxygen and a fuel supply tube arranged to extend through the oxygen tube to convey a stream of fluidized, pulverized, solid fuel into a flame chamber. Oxyg

A burner assembly combines oxygen and fuel to produce a flame. The burner assembly includes an oxygen supply tube adapted to receive a stream of oxygen and a fuel supply tube arranged to extend through the oxygen tube to convey a stream of fluidized, pulverized, solid fuel into a flame chamber. Oxygen flowing through the oxygen supply tube passes through oxygen-injection holes formed in the fuel supply tube and then mixes with fluidized, pulverized, solid fuel passing through the fuel supply tube to create an oxygen-fuel mixture in a downstream portion of the fuel supply tube. This mixture is discharged into the flame chamber and ignited in a flame chamber to produce a flame.

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What is claimed is: 1. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising a fuel supply system including a solid-fuel conduit formed to include a fuel transport passageway mixing means for mixing a stream of oxygen with fluidized, pulverized, solid fu

What is claimed is: 1. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising a fuel supply system including a solid-fuel conduit formed to include a fuel transport passageway mixing means for mixing a stream of oxygen with fluidized, pulverized, solid fuel conducted through the fuel transport passageway prior to combustion to produce a mixture that can be ignited in a flame chamber to produce a flame wherein the mixing means includes an oxygen flow passage and a oxygen-fuel nozzle positioned to lie in the oxygen flow passage and formed to include an oxygen-fuel transport passageway, a fuel inlet opening located to admit fluidized, pulverized, solid fuel discharged from the fuel transport passageway into the oxygen-fuel transport passageway, and an oxygen-fuel outlet opening located to discharge an oxygen-fuel mixture into the flame chamber, and upstream oxygen-injection holes arranged to conduct oxygen flowing in the oxygen flow passage into the oxygen-fuel transport passageway to mix with fluidized, pulverized, solid fuel flowing in the oxygen-fuel transport passageway toward the oxygen-fuel outlet opening to establish a combustible oxygen-fuel mixture flowing in the oxygen-fuel transport passageway and exiting through the oxygen-fuel outlet opening, and wherein the oxygen-fuel nozzle includes a cylindrical interior wall communicating with the fuel inlet opening and defining a first-stage portion of the oxygen-fuel transport passageway and the oxygen-fuel nozzle further includes a frustoconical interior wall extending from the cylindrical interior wall to the oxygen-fuel outlet opening to diverge in a direction toward the oxygen-fuel outlet opening and defining a second-stage portion of the oxygen-fuel transport passageway, and further comprising diverter means located in the second-stage portion for interrupting flow of the combustible oxygen-fuel mixture flowing toward the oxygen-fuel outlet opening to cause some of said mixture to flow along the frustoconical interior wall toward the oxygen-fuel outlet opening. 2. The burner assembly claim 1, wherein the oxygen-fuel nozzle includes an outlet end face including a circular interior edge defining an annular outer boundary of the oxygen-fuel outlet opening and the diverter means includes a circular exterior edge that lies in concentric, spaced-apart relation to the circular interior edge to establish an annular shape of the oxygen-fuel outlet opening. 3. The burner assembly of claim 2, wherein the diverter means includes an interior cone-shaped portion having an apex positioned to lie at a junction between the first-stage and second-stage portions of the oxygen-fuel transport passageway. 4. The burner assembly of claim 3, wherein the diverter means further includes a hemisphere-shaped portion coupled to a base of the interior cone-shaped portion and arranged to lie outside of the oxygen-fuel transport passageway. 5. The burner assembly of claim 3, wherein the diverter means further includes an exterior cone-shaped portion coupled to a base of the interior cone-shaped portion and arranged to lie outside of the oxygen-fuel transport passageway. 6. The burner assembly of claim 3, wherein the interior cone-shaped portion includes a flat base including the cylindrical exterior edge and lying in substantially coplanar relation to the outlet end face. 7. The burner assembly of claim 1, wherein the cylindrical interior wall is formed to include the upstream oxygen-injection holes. 8. The burner assembly of claim 7, wherein the cylindrical interior wall is formed to include auxiliary oxygen-injection holes located in a region between the upstream oxygen-injection holes and the frustoconical interior wall.