Rotary drums for efficient drying and cooling

Abstract Rotary drum dryers have been used for decades for drying many different types of goods and are widely used in the building, minerals, and raw material industry, as well in the chemical industry, fertilizer industry and other branches. At the same time, further, drum dryers have been improved for energy-efficient applications, particularly in the mineral industry, for very robust and hard-wearing solutions. Significant progress has been achieved for special applications, such as drums for combined drying and subsequent cooling in one unit, dryers with heat recovery by gas circulation or the use of evaporating cooling, rotary drums for granulation and coating procedures, indirect cooling drums for hot products by air or water with heat recovery, etc.