Patent ID: 7189073

Claim:
A burner with staged fuel injection, comprising: a swirl generator for a combustion air stream; inlet orifices for the combustion air stream; and means for the introduction of fuel into the combustion air stream comprising at least one first fuel supply with a first group of fuel outlet orifices and a second fuel supply with a second group of fuel outlet orifices downstream of the first group of fuel outlet orifices, the first and second group of fuel outlet orifices and the inlet orifices for the combustion air stream being arranged along a swirl space formed by the swirl generator, a transitional region between the first and the second group of fuel outlet orifices including a separating element arranged in the swirl space, said separating element having walls with an end and separating, at least over a portion of a longitudinal axis of the burner, a first combustion air stream, which enters the swirl space in the region of the first group of fuel outlet orifices, from a second combustion air stream which flows into the swirl space in the region of the second group of fuel outlet orifices, the separating element comprising cooling ducts passing therethrough, wherein the cooling ducts comprise outlet orifices at the end of the walls of the separating element directed toward the combustion chamber.