Rotary burner for solid fuel

Device for combustion of granular material, wood flour pellets, and chippings, comprising a rotary solid fuel burner (1), air inlet to the burner, at least one conduit (18) for feeding fuel and an outlet (3) for combustion gases to a boiler part for heat transfer to water-cooled surfaces, wherein

• the rotary solid fuel burner is formed as a vessel with a rear wall, said outlet (3) for combustion gases and a jacket part between the rear wall and the outlet,
• a fuel feed pipe (18), which forms part of a fuel feed conduit, extends through the rear end wall,
• an air admission pipe (19) surrounds the central fuel feed pipe at a distance from the central fuel feed pipe, so that a space (20) which is ring-shaped in section is formed between the central fuel feed pipe (18) and the air admission pipe (19),
• at least one air admission duct (17b, 17a), which communicates with said ring-shaped space (20), extends in a radial direction out towards the jacket part and further along the jacket part of the way in the direction of the outlet for combustion gases, which duct is provided along a length of the duct with openings (10) for admitting combustion air from said duct into a combustion chamber (13) in the burner,
• means for feeding the fuel into the fuel feed pipe and for driving this through the pipe and through the rear end wall into the burner,
• means for introducing combustion air into said space (20) between the air admission pipe and fuel feed pipe, and
• means for rotating at least one of said fuel feed and air admission pipes, with at least one pipe connected to the burner and functioning as a driving axle for this burner, said burner being double-walled at both the rear wall and jacket part area of the combustion chamber with inner and outer walls (7/4, 8/5) characterized in that spaces (9, 6) between the inner and outer walls are divided to form a plurality of ducts (17b, 17a, which are delimited from one another by radial partition walls (16b) in the rear wall and by longitudinal partition walls (16a) in the jacket part area of the combustion chamber.