Hot air dryer

rotarybatchdehydration

GRELBEX indirect rotary dryers enable industrial drying of all powdered solids by bringing them indirectly into contact with hot gases. They are designed for reliable operation, low maintenance, maximum efficiency and industrial availability. These operating criteria make our rotary dryers a wise choice for drying powdered solids. Indirect rotary dryers consist of a cylinder (drum or calender) rotating slowly and evenly on two supports (bands). The cylinder is driven in rotation by an electric or hydraulic motor. The cylinder is enclosed in a box which heats the calender either by a flame on the calender, or by the circulation of hot air in the box. As the cylinder rotates, the product advances and meets the hot surface of the calender, losing its moisture as it is stirred. The drying process can be carried out under oxidizing, reducing or inert conditions. These dryers are suitable for a wide range of throughputs (from hundreds of kg to several tens of tons per hour), with rather high treatment temperatures (from 300 to over 1600°C) and can handle solids with rather fine particle sizes. They are particularly well-suited to the processing of mineral materials, vegetable matter or food products. It is important to optimize this equipment. There are numerous options for recovering part of the energy from the drying air stream after the process (partial recycling, condensation, cooling, separation, etc.).