Energy efficiency of flights rotary kiln

Rotary kiln is widespread for thermal treatment of granular materials in various industries. A better understanding of the heat transfer phenomena, inside, and outside of the industrial rotary kiln will open toward the development of sustainable tools of production such as materials recycling or heat waste recovery. The present paper details two examples about the interest brought by the IR measurements to rely the external wall temperature to the thermal behavior of rotary kiln. A special attention is given to the energy efficiency from a thermal model suited to industrial application as encountered in the asphalt plants.