A rotary dryer is a type of industrial equipment used to reduce the moisture content of materials. It consists of a cylindrical drum that rotates while hot air is passed through it. This process allows the material to be dried evenly and efficiently, making it suitable for various applications, including food processing, mineral processing, and biomass drying. The design of a rotary dryer enables continuous operation, where wet materials are fed in at one end and dried materials exit at the other. The combination of rotation and hot air ensures that the materials are exposed to heat for optimal drying, resulting in a consistent final product.