Nature and Structure of the Cylinder Rotary Kiln

Cylinder style is the matrix of the rotary kiln. The materials of the cylinder style are mainly made of carbon materials if there are no special requirements. The material is usually A3. The thickness is often determined by different span, different diameter, temperature factors, the form and size of the applied load, the heating form and other conditions. The thickness is usually 14mm-32mm. The length of the cylinder style of the rotary kiln for the production of the alumina production is 50m-l00m. The cylinder style needs multi-block support. The cylinder should have sufficient stiffness and strength. In the process of installation and operation, you should pay much attention to the quality of the installation and the operation so that the straightness of the axis and the ovality of the cross-sectional diameter, which is good for extending the service life of the inner materials of rotary kiln, reducing the running resistance and power consumption, reducing uneven wear, reducing mechanical accident and improving the operation rate of the equipment.
In the past, there are two kinds of overall compositions of the rotary kiln, namely riveting and welding. Most cylinders of the kiln are riveting, but the riveting has many flaws. For example, the rivets are easy to loose resulting in the serious deformation of the cylinder. In addition, the local refractory bricks are easy to fall off. With the industrial development of welding technology, the quality of welding has been able to be ensured. As a result, the overall structure composition of the cylinder is entirely replaced by the welding process rather that riveting process.
The operation temperature of the rotary kiln is very high. In order to protect the cylinder and reduce the heating loss, the firebricks or other refractory insulation materials are lined in the kiln. In order to prevent the downslide of the masonry due to the tilt of the kiln, there is a brick retaining group at intervals of the masonry. The brick retaining groups can be in the following locations: the interface between the brick kilns brick and the cooling, the interface of different thickness brick and the masonry insulation tiles segment.
There are kiln entrance measures besides the brick retaining groups. The purpose is to help the wet materials enter the kiln. There is wind retaining group at the feed end of the kiln to prevent the material in the kiln from rewinding the kiln inlet cover. The diameter of the annular inner hole should not be too small to prevent the too high airflow velocity. The fine particles will be taken away. With the development of industrial technology and processing capabilities, the cylinder may also have other changes.
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Karen Wu Nature and Structure of the Cylinder Rotary Kiln

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