Rotary Kiln an overview | ScienceDirect Topics
Rotary kiln incinerators usually have a lengthtodiameter (L/D) ratio between 2 and 8. Rotational speeds range between and cm/s, depending on the kiln periphery. High L/D ratios and slower rotational speeds are used for wastes requiring longer residence times. The kilns range from 2 to 5 meters in diameter and 8 to 40 meters in length.