The present invention relates to a method for incineration of combustible waste during the manufacture of cement clinker where cement raw meal is preheated and calcined in a preheater (1) with a calciner (3), burned into clinker in a kiln (5) and cooled in a subsequent clinker cooler (7), in which method the waste is incinerated in a separate compartment (9) subject to simultaneous supply of hot air, the exhaust gases produced during the waste incineration process being vented to the preheater for heating the cement raw meal, and the slag generated during the waste incineration process being extracted from the compartment, the waste is introduced via a waste inlet (11) onto a supporting surface (21) incorporated in the compartment (9) and in that, during incineration, the waste is transported through the compartment to the outlet (23) of the compartment along a circular path, characterized in that the compartment (9) is arranged at a distance from said calciner (3) or a preheater tower by means of a material chute (40), said material chute (40) enters a downward sloping duct, said duct carries exit gas from said compartment (9) and non-combustible material from waste fuel firing in said compartment (9) down into the calciner or preheater tower.

The invention relates to a feeder and method for feeding raw material which comprises plastic to a gasification, pyrolysis or combustion furnace, in which the feeder comprises a screw feeder part and a pneumatic feeder part in order to form a combined feeder for feeding the raw material, the screw feeder part comprises at least a screw to transfer the raw material to the pneumatic feeder part and at least one cooling device to cool the raw material in the screw feeder part, and the pneumatic feeder part arranged after the screw feeder part comprises at least one inlet to supply pneumatic carrier material to the raw material in the pneumatic feeder part for forming a mixture of the raw material and pneumatic carrier material.