Patent DE-102007031653-A1 (DE)
Title: Reactor for uniform thermal treatment of plastic material, comprises a vertical shaft surrounded by a mantle, an upper charging opening for the plastic material and a lower pouring opening in which the plastic material is continuously led
Inventor: KUEHNEMUND BERND
IPC: C08G63/80
Filed: 2007-07-06
Abstract: The reactor for uniform thermal treatment of plastic material, comprises a vertical shaft (1) surrounded by a mantle (2), an upper charging opening (3) for the plastic material, and a lower pouring opening (4) in which the plastic material is continuously led from upper towards the lower in vertical direction. The shaft comprises a central axis (5), a cylindrical area surrounded by the mantle area, a conical outflow area surrounded by the mantle area and tapered itself towards the bottom and subsequently towards the top and an installation in the lower part of the cylindrical area. The reactor for uniform thermal treatment of plastic material, comprises a vertical shaft (1) surrounded by a mantle (2), an upper charging opening (3) for the plastic material, and a lower pouring opening (4) in which the plastic material is continuously led from upper towards the lower in vertical direction. The shaft comprises a central axis (5), a cylindrical area surrounded by the mantle area, a conical outflow area surrounded by the mantle area and tapered itself towards the bottom and subsequently towards the top, an installation in the lower part of the cylindrical area and/or in the conical outflow area, an external gas inlet opening present in the reactor mantle, an internal gas inlet opening present in the installation, and a gas outlet opening present above the gas inlet opening. The vertical interval of the gas inlet opening is smaller than the difference of the radial intervals of the central axis between the interior edge of the external gas inlet opening and the exterior edge of the internal gas inlet opening. The length of the edges forms a relation to the circumference of the reactors in the cylindrical area (U z) over the gas into the reactor flow (LG), where LG/U zis greater than 1.1 and/or less than 1.5. The cross section area of the shaft in the cylindrical area (AP z) forms a relation to the total minimum product passage area in the gassing area (AP), where AP z/AP is greater than 1.8 and/or less than 3.7. The minimum product passage area arises between the limitations of the gas inlet opening under consideration of the inclination of the limitations. The installation is formed as a hollow displacement body. The sum of the areas of the gas inlet opening (AG) forms a relation to the sum of the minimum product passage areas in the gassing area (AP), where AG/AP is greater than 1 and/or less than 3. The area of the gas inlet opening arises from the internal and external limitations of the gas inlet opening under consideration of the bulk product angle. The minimum product passage area (AP) arises between limitations of the gas inlet opening under consideration of the inclination of the limitations. The area of the external gas inlet opening (AG m) forms a relation to the area of the internal gas inlet opening (AG e), where AG m/AG eis greater than 2 and/or less than 3.2. The gas inlet openings pass from top towards the bottom. The opening angle is smaller than the bulk material angle. The shaft in the cylindrical area has a diameter (D z) of 3-8 meter. The installation is arranged in axially symmetrical concentric installation that is arranged concentric to the central axis of the shaft and has an upper part area tapered towards the top, and a lower part area. The upper part area of the installation has a tip that is arranged above the height of a conical diversion of the product flow, when the conical diversion of the product flow is carried out in the mantle area above a gas inlet opening in the mantle. An angle (alpha ) for horizontally coming from the point (K) or of the gas inlet opening is 25-45[deg] . The gas inlet opening in the mantle is implemented in the transition area of the cylindrical part to conical part of the shaft. The mantle and/or the installation have a polygon and/or round cross section. A further installation is arranged with a gas inlet opening in the gassing area of the reactor. The total length of the edges forms a relation to the circumference of the reactor in the cylindrical area (UZ) over the gas in the reactor flow (LG t), where LG t/UZ zis greater than 2 and/or less than 4. The gas inlet opening is arranged ring-shaped or as ring segment along the cross section through the displacement body. A retaining element e.g. a perforated metal plate, a slit sheet metal or a column sheet metal is arranged in the gas inlet opening. A controllable retaining element exists itself in a supply line to the gas inlet opening or in the gas inlet opening. An independent claim is included for a procedure for uniform thermal treatment of plastic material.