Externally heated rotary kiln - leading a new era in calcination technology
Published:
2025-07-16 07:45
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An externally heated rotary kiln is a large-scale, high-temperature reaction device. Its structure mainly consists of a cylindrical body, supporting device, transmission device, combustion device, sealing device, etc. In an externally heated rotary kiln, the heat source is outside the kiln body and does not directly contact the material inside the kiln. Heat is transferred to the material inside the kiln through the kiln wall, allowing the material inside the kiln to reach the required calcination temperature. This equipment is mainly used in high-temperature oxidation reactions, high-temperature reduction reactions, and chemical calcination in industries where raw materials cannot be directly heated. The heating methods for externally heated rotary kilns include electric heating, fuel oil heating, and natural gas heating.
Externally heated rotary kilns use advanced calcination technology. Their operating principle involves adding mixed raw materials to a rotating cylinder. The raw materials react at high temperatures, causing chemical reactions that change the physical and chemical properties of the raw materials. Because the materials do not directly contact the heat source, it avoids contamination of the materials and destruction of the reaction atmosphere.
Through continuous technological innovation and accumulation in recent years, Chaoyang Heavy Machinery Equipment Development Co., Ltd. has achieved remarkable results in rotary kilns, especially externally heated rotary kilns. It has formed an industry structure model that covers the entire process from process design to equipment production, manufacturing, and installation and commissioning. To date, the largest externally heated rotary kiln produced and manufactured by Chaoyang Heavy Development Company has a diameter of 3 meters and a calcination temperature as high as 1100℃.
Compared with traditional externally heated rotary kilns, the externally heated rotary kilns we design and develop have the following characteristics:
1. The selection of kiln body materials balances performance and economy, achieving optimal use in the most economical way.
2. The external combustion device design is flexible, using an upper and lower two-stage assembly design for convenient maintenance. At the same time, the internal space of the heating chamber is optimized to ensure uniform heating of each part of the cylinder while minimizing heat loss.
3. Precise temperature control can be achieved according to actual production process needs to ensure product quality.
4. The material filling and discharge system inside the kiln has also been carefully designed and optimized to ensure uniform heating and smooth movement of the material in the kiln.
5. The optimal sealing method is adopted according to the needs of the internal reaction atmosphere. For a reducing atmosphere, it truly achieves oxygen-free sealing.
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