Premixing burner for generating an ignitable fuel/air mixture

A premixing burner for generating an ignitable fuel/air mixture, comprising:

• a swirl generator having at least two burner shells which complement one another to form a throughflow body and which jointly enclose an axially conically widening swirl space and delimit, with respect to one another in the axial longitudinal extent of the cone, tangential air inlet slits through which combustion supply air can pass into the swirl space in which an axially propagating swirl flow can be formed and
• means for the injection of fuel, said fuel injection means positioned at least partially along the tangentially running air inlet slits, the fuel injection means comprising a fuel line separate from the at least two burner shells and firmly attached to at least one of the at least two burner shells so as to be longitudinally movable with respect to said at least one burner shell and so as to be releasable perpendicularly to the surface of the burner shell;
• fuel injectors along the fuel line and projecting beyond a circumferential edge of the fuel line;
• and
• orifices in said at least one burner shell, the fuel injectors extending into the orifices;
• wherein at least some of the orifices comprise slots, each slot having a largest dimension which is parallel to the longitudinal direction of the fuel line and wherein the fuel line is attached to the at least one of the two burner shells independently of the fuel injectors.