Abstract: The invention relates to a method and a device for melting down solid combustion residues such as slags, ashes and fine dusts from waste combustion installations (11) with solid, liquid and/or gaseous fossil fuels in a melting device. In order to reduce the necessary energy by combusting fossil fuels, the supply of the combustion residues (12) from the waste combustion installation (11) takes place directly into the filling opening (13) of the melting device. The melting device is designed as a shaft furnace (10) with a furnace space (14, 15) with a refractory lining, the combustion residues (12) being melted down by means of a fuel/oxygen mixture or by means of a fuel/oxygen-air mixture which is introduced into the shaft furnace below the combustion residue fill (21).

Abstract: The invention relates to a process for burning waste with simultaneous regeneration of a usable gas and an inert solid residue in which the waste is fed into the upper part of an upright shaft furnace, an oxygen-containing gas is fed into the lower part of the furnace, the organic part of the waste substances is gasified and pyrolyzed, the inorganic part of the waste substances is made flowable, the gas from the upper part of the furnace is taken off and the inorganic material made flowable is taken off at the lower part of the furnace.