Two-fluid nozzle for atomizing a liquid solid slurry and protecting nozzle tip

Claim 1

A burner nozzle assembly tip in combination with a burner nozzle assembly, said assembly including means for discharge through a discharge orifice and combustion in a combustion zone at relatively high temperature, said tip comprising a cap portion including a central outlet bounded by an exit tube having an upstream portion and a downstream portion and connected at its upstream portion to the discharge orifice and being open to a combustion zone at the downstream portion, said downstream portion flaring outwardly beginning at the location at said opening to a combustion zone to provide a smooth elliptical face ending at the downstream end in a right cylindrical section for attachment to the burner nozzle periphery, said exit tube having a shoulder intermediate an upstream end and the location adjacent said opening to a combustion zone, and a heat shield portion including a thermally resistant metal alloy heat shield having a retaining ring which is located at said shoulder and, in contact therewith and said heat shield comprising a liner connected to said retaining ring and having an upstream end and a downstream end, the upstream end of which has a diameter less than said outlet, said liner diverging outwardly at its downstream end form a central longitudinal axis of said burner nozzle assembly to a diameter larger than said outlet, so that said outlet is partially covered by said liner and protects said outlet from the heat produced by a combustion temperature.