● With advanced structure, the low pressure loss of the vertical preheated can speed up the preheating process, the decomposition rate in the kiln of the preheated limestone can be 20-25%, and can use directly the 10-15mm fine grade limestone.

●Both ends of rotary kiln is sealed by combination scale, which ensures the index of air leakage less than 10%. In order to lessen the radiation loss, it adopts compound refractory materials.

●Round or square vertical cooler with filling type and ventilated area, which make the lime temperature 800 centigrade + ambient temperature. It is easy to transport, store, and can be preheated the secondary kiln air to above 700 centigrade, which reduce the moving parts and special materials.