Premixing burner for generating an ignitable fuel/air mixture
A premixing burner has a swirl generator with at least two burner shells ( 1 ) which jointly enclose an axia conically widening swirl space and delimit tangential air inlet slits ( 3 ) through which combustion supply air passes into the swirl space in which an axially propagating swirl flow is formed, and with fuel injection devices at least partially along the tangentially running air inlet slits ( 3 ). The fuel injection devices include a fuel line ( 6 ) separate from the burner shell ( 1 ) and which is firmly attached to the burner shell ( 1 ) so as to be longitudinally movable with respect to the burner shell ( 1 ) and releasable perpendicularly to the surface of the burner shell ( 1 ). In the burner shell ( 1 ), orifices ( 4 ) are provided, into which issue fuel injectors ( 7 ) which are provided along the fuel line ( 6 ) and which project beyond the circumferential edge of the fuel line ( 6 ).
1. 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.
2. The premixing burner as claimed in claim 1 , wherein said at least one burner shell includes a surface which faces the fuel line, and further comprising:
a holding device along the burner shell connected to said at least one burner shell and which fixes the fuel line while applying a prestress directed perpendicularly to said surface of the at least one burner shell.
3. The premixing burner as claimed in claim 1 , wherein said at least one burner shell includes a surface which faces the fuel line, the fuel line includes a circumferential edge, and further comprising:
spacer elements between the surface of the at least one burner shell and the circumferential edge of the fuel line, the spacer elements defining an air gap between said surface of the at least one burner shell and the fuel line.
4. The premixing burner as claimed in claim 1 , further comprising:
a component which is not part of a burner shell; and
wherein the fuel line comprises a connecting web via which the fuel line is firmly connected to said component.
5. The premixing burner as claimed in claim 1 , wherein the fuel line has a circumferential edge;
wherein the fuel injectors comprise sleeve elements which each have a hollow duct and which each have at most an elevation which projects beyond the circumferential edge of the fuel line, the fuel injectors joined flush to a surface of the at least one burner shell which faces away from the fuel line with the sleeve elements.
6. The premixing burner as claimed in claim 2 , wherein the holding device is releasably connected to said at least one burner shell.
7. The premixing burner as claimed in claim 4 , further comprising:
a molded element surrounding the at least two burner shells, the molded element positioned at a downstream end region of the swirl generator, the connecting web of the fuel line fastened to the molded element.