The invention relates to a solid fuel burner, mountable on a boiler furnace, the forward portion of the burner being insertable through an opening in the casing of the furnace such as to extend into the combustion zone thereof. The burner includes a tubular main body accommodating a feed screw for the solid fuel, the free end of the screw terminating in the forward portion of the burner, the other closed end of the burner being rotatably mounted in a bearing; a drive means for rotating the feed screw inside the main body; an ignition chamber disposed at the forward end portion, one open end of the ignition chamber meeting up with the main body (7) and the feed screw terminating within the chamber; an air supply duct with its delivery end in the chamber for supplying combustion air to the fuel, and an inlet in the main body giving access to the screw and thus permitting the supply of fuel from a solid fuel container to the feed screw. |