In calcining applications, rotary kilns and TORBED reactors differ mainly in their operating principles, heat transfer characteristics, and processing speed.
A rotary kiln is a long, slightly inclined rotating cylindrical furnace in which solid materials slowly move from the feed end to the discharge end while being heated. Heat transfer occurs mainly through convection and conduction, so the process is relatively slow and requires long residence times ranging from minutes to hours. Rotary kilns are very robust and can handle a wide range of particle sizes, including large lumps, making them widely used in industries such as cement, lime, and mineral processing. However, they havea larger physical footprintand greater mechanical complexity that a TORBED processor.
In contrast, a TORBED processor is a high-intensity fluidized bed system that uses high-velocity gas to suspend and vigorously mix particles. This intense mixing provides very high heat and mass transfer rates, allowing calcining to occur much more rapidly, often within. TORBED systems offer excellent temperature uniformity,real time control and consistency of output. Additionally, they are more compact than rotary kilns of similar capacity.