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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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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 andmixing means for mixing a stream of oxygen with fluidized, pulverized, solid fuel conducted throu

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 andmixing 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 outer tube, the solid-fuel conduit extends into the outer tube to define an oxygen flow passage therebetween, the mixing means further includes an oxygen-fuel nozzle coupled to the solid-fuel conduit to receive fluidized, pulverized, solid fuel discharged from the solid-fuel conduit and formed to include oxygen-injection means for admitting a stream of oxygen flowing through the oxygen flow passage into a stream of fluidized, pulverized, solid fuel flowing through the oxygen-fuel nozzle, and the oxygen-fuel nozzle includes an inner wall extending from the oxygen-injection means to an oxygen-fuel outlet opening formed in an outlet end face of the oxygen-fuel nozzle and a plurality of flow-expansion channels and wherein each flow-expansion channel has a first opening formed in the inner wall and a second opening formed in the outlet end face. 2. The burner assembly of claim 1, wherein the oxygen-fuel nozzle further includes a bullet-shaped curved wall defining each flow-expansion channel. 3. The burner assembly of claim 1, wherein the inner wall has a cylindrical shape and the plurality of flow-expansion channels are circumferentially spaced apart from one another about the inner wall. 4. 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 andmixing 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 constant-velocity oxygen-fuel nozzle positioned to lie in the oxygen flow passage and whereinthe constant-velocity oxygen-fuel nozzle is formed to includean 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,an oxygen-fuel outlet opening located to discharge an oxygen-fuel mixture into the flame chamber,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, anda flow-expansion section located in the oxygen-fuel transport passageway between the fuel inlet opening and the oxygen-fuel outlet opening and configured for decelerating flow of fuel and oxygen in the oxygen-fuel transport passageway to cause the oxygen-fuel mixture exiting the oxygen-fuel transport passageway through the oxygen-fuel outlet opening to have a velocity that is about equal to a velocity of fuel entering the oxygen-fuel transport passageway through the fuel inlet opening even though oxygen is discharged into the oxygen-fuel transport passageway through the upstream oxygen-injection holeswherein the flow-expansion section is funnel-shaped and is arranged to diverge in a downstream direction toward the oxygen-fuel outlet opening andwherein the flow-expansion section includes an upstream funnel-shaped portion arranged to diverge in a downstream direction toward the oxygen-fuel outlet opening and formed to include an outlet having a first diameter and a downstream funnel-shaped portion arranged to diverge in a downstream direction toward the oxygen-fuel outlet opening and formed to include an outlet having a second diameter that is larger than the first diameter.