When it dries materials, hot air or hot flue gas heat the material, so that it evaporates and, at the same time relying on ventilation equipment, drying medium drying equipment constantly updated to exclude water vapor.
Drying equipments have various forms, and some commonly used equipments in the cement industry include rotary dryer, flow pattern dryer, and stirring (suspended) drying positive airflow drying tube.
At home and abroad in recent years are still studying the spray drying device.
These devices are generally drying materials by hot flue gas convection.
Rotary dryer cylinder is generally a single straight-type cylinder with horizontal installation at an inclined angle, and material from high-end to enter, and then discharged as the rotation of the cylinder flowing slowly low-end.
In small and medium-sized cement plant, the length of the dryer cylinder is generally 6-20m, to ensure that the residence time of the material in the dryer, and to meet the requirements of the drying process.
The supporting device: in the higher temperature side looper inner cylinder on the supporting the wheel band with the supporting wheel, the low temperature end in the center axis with a bearing support, and the center drive, so that the overall structure is compact and rational.
With the repair and replacement of wear parts, the middle is generally designed to axially split, with bolted connection.
When the machine works, the materials with hot gas stream downstream from the small end of the inner cone into the lifting plate to take a sufficient heat exchange with the hot gas stream, while moving to the big end.
Similarly, after going into the outer cylinder, the material is raised and evenly scattered by the spoon-shaped lifting plate, including the upper part of the outer wall of the cone with the cylinder slow rotation.
The material can experience a longer residence time in the annular space.
Finally, the guide plate along the cylinder wall and the outer wall of the inner cylinder flows to the outlet end, and is discharged through the flap valve.
The exhaust gas is handled and discharged by the discharge hood of the cyclone precipitator dust collector.
With the continuous development of the cement production to large-scale, efficient direction, rotary dryer is a desirable drying equipment for the original cement plant because of its compact structure, small footprint, high thermal efficiency, investment, adaptable and reliable operation.
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