Rotary dryers have a wide range of applications, are easy to operate, and have a high operating rate. They are widely used in the cement industry to dry raw materials and fuels such as clay, slag, crushed stone, and coal. When drying, hot air or hot flue gas transfers heat to the material, causing water to evaporate. At the same time, relying on the ventilation equipment, the drying medium inside the drying equipment is continuously updated to eliminate water vapor. There are also various forms of drying equipment, commonly used in the cement industry include rotary dryers, fluidized bed dryers, stirring (suspension) dryers, and positive airflow drying tubes. In recent years, spray drying devices are still being studied at home and abroad. These devices generally use hot flue gas for convective drying. The rotary dryer cylinder is generally a single straight cylinder type, and when installed, the cylinder is inclined at an angle to the horizontal. The material enters from the high end and slowly flows towards the low end as the cylinder rotates before being discharged. In small and medium-sized cement plants, the length of the dryer cylinder is generally 6-20m to ensure the residence time of materials in the dryer and meet the requirements of the drying process. The hot air flow and materials from the hot blast stove undergo heat exchange in the cylinder in a forward or reverse flow manner.