Patent ID: 6895759

Claim:
A premix burner, suitable for forming at least one stable flame front in a combustion chamber, for use with means for supplying fuel and air to said premix burner, and with means for mixing fuel and air to form a fuel/air mixture for subsequent combustion in the combustion chamber, said burner comprising: a premix burner casing, having an upstream end and a downstream end defining a flow direction, said burner casing comprising a tube which is open at an upstream end, has a transition contour, and is in fluid communication with the combustion chamber at a tube downstream end via the transition contour, for flowing air therethrough; a burner lance comprising an inner tube having an outer wall and projecting into the interior of the premix burner casing on the premix burner casing upstream end to form an annular flow duct with the burner casing, the burner lance having: an upstream end, a downstream end, and an inner tube wall forming an inner flow passage enclosed by said inner tube wall; at least one first fuel supply unit on the inner tube wall to supply fuel into the inner flow passage; and at least one second fuel supply unit on the outer wall of the burner lance to supply fuel into the annular flow duct.