Patent ID: 8029273

Claim:
A burner comprising: a vortex generator for a combustion air stream; a plurality of air inlet ducts via which the combustion air stream enters a vortex chamber of the vortex generator, wherein fuel is injected into the combustion air stream at each of the plurality of air inlet ducts, and wherein the fuel is injected asymmetrically with respect to the combustion air stream; and a plurality of fuel pipes, each one of the plurality of fuel pipes being arranged to inject the fuel at a different one of the plurality of air inlet ducts and having a group of fuel injection orifices arranged in a pattern, wherein each of the fuel injection orifices of all of the groups of fuel injection orifices is arranged at an axial position with respect to a longitudinal axis of the burner, and wherein each of the axial positions is different from all other of the axial positions.