Kiln Systems
All kiln systems for burning cement clinker are based on the rotary kiln principal .
At first classification of kiln can be made according to water content of kiln feed :
1 – Dry process > 1 % water
2 – Semi-dry process 10 – 12 % water
3 – Semi-wet process 17 – 21 % water
4 – Wet process 25 – 40 % water
Dry process
Rotary kiln with :
a – four stage preheater Kilns .
Single or twin cyclone stages . The kiln exit gas use to dry raw material up to a moisture content of 8 % .
b – One or Two stage preheater kilns .
c – Shaft suspension preheater .
d – Pre-calciner Kilns .
Total fuel used in this system divided to
35 % in main burner and 65 % in pre-calciner to achieve > 90 % calcination in pre-heater .
Guidelines for choosing kiln systems
1-Production capacity and investment costs .
2-Raw material .
3-Heat economy .
4-Power consumption and pressure drop .
5-Operation and maintenance .