Patent ID: 11988382

Abstract:
This invention relates to a rotary kiln (1) for cracking open and evaporating size-reduced plastic waste, consisting of a cylindrical kiln housing (2) the wall of which can be heated to the respective evaporation temperature. The kiln housing (2) is bearing mounted so as to be rotatable around a longitudinal axis (X-X). Within the kiln housing (2) a fixedly positioned feed device (5) for the size-reduced plastic waste is placed running in the longitudinal direction of the kiln housing. The feed device (5) at least one-sidedly protrudes with a loading section (6) through a feed opening at an end side of the kiln housing (2), which loading section (6) can be connected to a material feed device (7). At the end side situated opposite the feed opening a gas suction opening (20) is situated in the kiln housing (2). The feed device comprises a conveyor device (5) and a conveyor tube (8), extending along the full length of the kiln housing (2), in which the conveyor device (5) for the size-reduced plastic waste is arranged in such a way that the plastic waste is moved from the loading section (6) in longitudinal direction through the kiln housing (2). The conveyor tube (8) has an outer sleeve (10) configured such that in the interior of the conveyor tube (8) an operational temperature prevails that is below the melting temperature of the size-reduced plastic material. Outlet openings (16, 16a, 16b, 16c, 16d, 16e) for the size-reduced plastic material are positioned such in the conveyor tube (8) including the sleeve (10) that the size-reduced plastic material drops out of the outlet openings (16, 16a, 16b, 16c, 16d, 16e) directly onto the opposite interior side of the kiln housing (2).