Patent ID: 8869535

Claim:
A turbine burner, comprising: a secondary feed unit for supplying a secondary fuel or air and for discharging the secondary fuel or air from an orifice into a combustion zone; and a primary feed unit comprising a primary mixing tube and a fuel nozzle having a fuel nozzle outlet pointing into the combustion zone for supplying a primary fuel, wherein the fuel nozzle and the primary mixing tube are arranged concentrically around the secondary feed unit, wherein the primary mixing tube and the fuel nozzle have a fluid flow connection, wherein the fuel nozzle has an annular wall spaced radially apart from the secondary feed unit in an axial direction to form a gap height by the annular wall and the secondary feed unit, wherein the annular wall has an internal wall directed toward the secondary feed unit, wherein a fluid channel is between the secondary feed unit and the annular wall, wherein the fluid channel comprises blades each having a blade leading edge on an upstream side, wherein the fuel nozzle has a fuel nozzle inlet, wherein the each blade has an axial distance to the fuel nozzle inlet and a ratio of the axial distance to the gap height is greater than 1 and less than 4, and wherein the gap height is greater at the fuel nozzle inlet than downstream of the fuel nozzle inlet.