Patent ID: 8057224

Claim:
A burner arrangement comprising: a premix burner for a heat generator generating a swirl flow, the premix burner having sectional conical shells which complement one another to form a swirl body, the shells enclosing a conically widening swirl space and mutually defining tangential air-inlet slots; fuel feeds for at least a first fuel, distributed along the tangential air-inlet slots, the fuel feeds including at least one fuel feed for a second fuel, the at least one fuel feed for a second fuel being arranged along a burner arrangement axis passing centrally through the swirl space; a transition piece assisting or maintaining the swirl flow directly connected to the premix burner downstream of the swirl body; a mixing tube directly connected to and downstream of the transition piece, the mixing tube having an axial downstream end; and at least one additional fuel feed positioned centrally in a region of the mixing tube relative to the mixing tube axial downstream end, or upstream of the mixing tube axial downstream end; wherein the mixing tube is configured and arranged to receive a mixture formed within the premix burner, and wherein the at least one additional fuel feed is configured and arranged to inject fuel into said mixture.