Abstract: A furnace for burning solid waste material such as straw bales or wood shavings is fed automatically from a reservoir container through a pipe that leads into the bottom of the furnaces combustion chamber. The automatic feed may comprise a pusher sliding in the pipe under the action of a ram, or an auger. In either case, the pusher or auger largely blocks the pipe to prevent unwanted entry of air into the combustion chamber. The pusher is controlled by an element which senses flue temperature. The container outlet may include a ripping chain to break down the material and the pipe may include a fire extinguishing connection controlled by a heat sensor. The furnace is adapted for admitting controlled quantities of primary air and the hot incompletely burned gases of combustion pass to an after-burning chamber where secondary air is admitted.

Abstract: A furnace adapted for burning waste materials such as straw, brushwood or the like has a cylindrical housing enclosing a combustion chamber and a hopper above the chamber for supplying fuel thereto. A slidable partition member separates the hopper from the combustion chamber. A suction tube having a constriction in its wall to reduce the cross-section of the tube is provided to withdraw combustion gases from the combustion chamber. A conduit connected to a source of compressed air terminates in a nozzle disposed in the suction tube to direct compressed air in the direction of the flow of gases from the combustion chamber. Pillers are provided in the chamber to support a bale of straw or other fuel material.