A rotary heat type furnace is a cylindrical thermal processing device. It rotates around its axis to facilitate the movement and treatment of materials within its heated chamber.
These furnaces are typically constructed from a single sheet of steel. This forms a cylinder with diameters ranging from 0.9 to 1.8 meters and lengths from 9.1 to 18.3 meters.
The furnace is supported by multiple pairs of supporting wheels. It is inclined at an angle of 3% to 6%. This allows materials to move from the higher end to the lower end as the cylinder rotates.
5 Key Features Explained
1. Construction and Operation
The rotary furnace consists of a steel cylinder lined with refractory materials. This lining protects the steel shell from heat damage and ensures uniform heat distribution across the furnace's radial temperature.
The furnace is driven by an electric motor through gears. These gears control the slow rotation necessary for the movement of materials inside.
2. Heating Mechanism
Heat is applied to the furnace through various methods. This includes direct firing of fuel into the tube or via hot gas discharge from the fuel.
In some configurations, a gas burner is mounted on a separate frame. The heat is generated by combustion within the furnace.
The flue gas, produced by the combustion process, is discharged from the higher end of the furnace. This creates a counterflow with the materials being processed, enhancing heat transfer efficiency.
3. Application and Features
Rotary furnaces are versatile and used in various industries for processes such as calcining, roasting, drying, and melting. They are particularly suitable for aluminum melting, especially for scrap melting.
The furnaces can be equipped with multiple heat zones. This allows for precise temperature control and optimal processing conditions.
Modern rotary furnaces often include advanced features such as digital instrumentation, intelligent temperature control, and integrated safety functions. These improve efficiency, safety, and reliability.
4. Advantages of Tilted Design
In recent years, rotary furnaces have evolved from static designs to tilted ones. This tilting design offers several advantages, including shorter cycle times, increased throughput, and reduced energy consumption.
The tilt allows for more efficient movement of materials through the furnace. This enhances the overall performance and efficiency of the heat treatment process.
5. Summary
In summary, a rotary heat type furnace is a sophisticated thermal processing tool. It is designed to handle a variety of materials and processes efficiently and effectively.
Its rotating and tilting mechanisms, combined with advanced heating and control technologies, make it a crucial asset in many industrial applications.
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