The first stage began by upgrading the clinker cooler to an efficient Cross-Bar® Cooler prepared to supply the calciner with hot tertiary air. A high degree of substitution with alternative fuels was an important requirement for an upgraded preheater. The ILC Preheater system was chosen for its good performance with every type of fuel, and for a design incorporating a high-temperature zone, low-NOX operation and extended residence time. A HOTDISC® Combustion Device was also added to the calciner to enable the use of coarse and lumpy fuels.
In the second phase, the new preheater was built in front of the existing tower, and the rotary kiln was shortened to position the kiln inlet directly below the HOTDISC and calciner.