Rotary kiln

Various system components are summarized under the term rotary kiln :

• Rotary kiln
• Rotary kiln dryer
• Rotary barrel cooler
  • Sectional cooler
• Rotary mixer

Typical characteristics

The common element is a horizontally aligned pipe, which is usually stored on two storage stations.

Traditional storage stations consist of races that rotate in caster stations. In the case of very long rotary tubes, especially the cement kilns, more than two storage stations are often used in order to keep the deflection of the tube to a tolerable level.

With the help of large ball bearings, only one storage station can be used with short rotary tubes, since these bearings are "tilt-resistant".

Internals

Rotary tubes can be fitted with fixtures depending on the application:

• Lifting shovels for better mixing of the product
• Heating pipes that are brought to the desired temperature with water, steam, heating gas or thermal oil.
• Cooling pipes that transport the heat away with water or cooling air
• Inner lining that protects the (metallic) jacket from overheating

Materials

Rotary tubes usually consist of

• Normal steel for temperatures up to 350 ° C
• Stainless steel for temperatures up to 550 ° C and corrosive products
• High temperature steel for temperatures up to 950 ° C
• Ceramic for temperatures up to 1400 ° C

literature

• Bernd Bilitewski, Georg Härdtle, Klaus Marek: Waste Management. An introduction, 2nd edition, Springer Verlag, Berlin / Heidelberg 1994, ISBN 978-3-662-05566-3 .
• Karl Kröll: drying technology. Second volume, second edition, Springer Verlag, Berlin / Heidelberg 1978, ISBN 978-3-642-61875-8 .
• Karl-Heinrich Grote, Jörg Feldhusen (Hrsg.): Dubbel - paperback for mechanical engineering . 24th, updated and expanded edition. Springer, Berlin / Heidelberg 2014, ISBN 978-3-642-38890-3 , doi : 10.1007 / 978-3-642-38891-0 .
• Reinhard Scholz, Michael Beckmann, Frank Schulenburg: Waste treatment in thermal processes. 1st edition. BG Teubner, Stuttgart 2001, ISBN 978-3-519-00402-8 .

Web links

• Dynamic modeling of rotary kilns. (PDF) accessed on April 10, 2017
• Comparative representation of combustion in grate firing and rotary kiln. (PDF) accessed on April 10, 2017
• Rotary tube with jacket cooling for incineration plants. (PDF) accessed on April 10, 2017
• Rotary kiln process development. (PDF) accessed on April 10, 2017