4. Rotary coolers

The rotary cooler is the oldest clinker cooling system installed on rotary kilns.

Mechanically simple (figure 16 ), it presents two process difficulties when used on high-capacity furnaces:

• candle formation at the clinker chute on the inlet side;

• fluctuating air velocity in the lift zone.

The first of these problems can be solved by using a water-cooled chute or by equipping the chute with an automatic ringing (cleaning) system, while the second can be solved by increasing the diameter of the tube between its two tyres.

As with the balloon cooler