Patent ID: 6482000
Filing Date: 2002-11-19
Classification: F23C,F23D

Abstract:
A no exit-flame burner comprisingan elongate ignition chamber tube having a longitudinal axis, an elongate mixing chamber tube of shorter length than said ignition chamber tube nested coaxially along said longitudinal axis within said mixing chamber tube so as to nest a first end of said mixing chamber tube in a first end of said ignition chamber tube, said first ends of said ignition and mixing chamber tubes sealed by a sealing member, a gas port for delivery of oxygen-bearing gas, formed in said sealing member positioned radially outwardly of said longitudinal axis, a gas diffuser mounted at an upstream end to said sealing member and nested coaxially within said mixing chamber tube, a fuel-feeding bore within said gas diffuser aligned coaxially with said longitudinal axis at an exit orifice of said bore within said mixing chamber tube, said bore communicating in fluid communication with a fuel-feeding infeed mounted on said sealing member, wherein said gas diffuser at a downstream end opposite said upstream end is shaped generally as a rhombus in cross-section along said longitudinal axis to thereby define a rim around an apex thereof, said rim orthogonal to said longitudinal axis and sized to extend substantially around, closely adjacent to, a corresponding inside surface of said mixing chamber tube to thereby define an upstream gas plenum upstream of said rim between said rim and said sealing member, a radially spaced apart array of flow-directing slits formed in said rim, radially spaced apart around said longitudinal axis, for directing a gas flow from said plenum into adjacency to said exit orifice of said bore in said mixing chamber tube downstream of said rim.