Patent ID: 8584605

Claim:
A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising an outer tube formed to include a first end, a second end, and an annular side wall lying between the first and second ends, and a fuel supply tube extending through the outer tube and lying in spaced-apart relation to the annular side wall to define an oxygen flow passage therebetween, the fuel supply tube being formed to include an outlet end face formed to include an oxygen-fuel outlet opening and upstream oxygen-injection holes arranged to conduct oxygen flowing in the oxygen flow passage into a stream of fluidized, pulverized, solid fuel flowing at an initial velocity in the fuel supply tube toward the oxygen-fuel outlet opening to establish a combustible oxygen-fuel mixture exiting the fuel supply tube through the oxygen-fuel outlet opening, the fuel supply tube further including means for decelerating fluid flow in the fuel supply tube to cause the combustible oxygen-fuel mixture exiting the fuel supply tube through the oxygen-fuel outlet opening to flow at a final velocity that is about equal to the initial velocity even though oxygen is discharged through the upstream oxygen-injection holes into the stream of fluidized, pulverized solid fuel flowing in the fuel supply tank.