The IKN Pendulum Cooler: Design and Operation
Pendulum Cooler design is dominated by the cross flow principle. The clinker is transported
horizontally across vertical airflow. Heating up of the air is the widely accepted objective of
modern cross flow coolers. At temperatures between 1050°C to 1100°C of the recuperative
air, sticking clinker dust and thermal stress of plant equipment can cause operational
problems. Cooler design must take the existing or expected clinker properties into account in
order to influence heat transfer.
In the IKN Pendulum Cooler the KIDS (Clinker Inlet Distribution System) conditions the
clinker bed by vertical segregation of the fluidizing fines and the coarse particles. High
velocity air jets purge the voids, entrain the fines and sweep them to the surface of the bed,
where they are transported by air. The KIDS opens the clinker bed, which results in easy
aeration at low pressure drop and uniform heat transfer. Mechanical mixing of the clinker bed
is avoided. The bottom layer of the clinker bed consists of cold coarse clinker.
More than 80 Pendulum Coolers have been sold. Recent installations in the Middle East
include the Pendulum Cooler retrofit at Union Cement’s Ras Al Khaimah plant and the new
cooler at Sharjah in the UAE.