Patent ID: 7565794

Claim:
A premix burner for a combustion chamber of a gas turbine, the burner comprising: a housing defining a mixer chamber configured and arranged to premix an oxidizer with a gaseous fuel, with liquid fuel, or with both; an oxidizer feed device configured and arranged to feed oxidizer into the mixer chamber, the feed device having at least one inlet opening configured and arranged so that the oxidizer when fed through said at least one inlet opening to the mixer chamber flows tangentially into the mixer chamber; a gaseous fuel feed device configured and arranged to feed gaseous fuel into the mixer chamber; a liquid fuel feed device configured and arranged to feed liquid fuel into the mixer chamber; an outlet opening in the housing configured and arranged to discharge oxidizer-fuel mixture from the mixer chamber into the combustion chamber; wherein the liquid fuel feed device comprises a main feed line with a plurality of injection orifices for liquid fuel, and at least a majority of the injection orifices are configured and arranged so that a main injection direction of the injection orifices has a radial component which extends perpendicularly to a main outflow direction of the burner; wherein a direction of the oxidizer-fuel mixture, when flowing from the mixer chamber at the outlet opening of the mixer chamber, is the main outflow direction of the burner; wherein the liquid fuel feed device comprises an oval-shaped cross sectional streamlined tube configured and arranged to be flow-washed around by oxidizer flow.