Cement applications

Concepts for preheaters.

Task
The preheater is a component installed upstream of the calciner and the rotary kiln of a clinker/cement plant.
By means of the counterflow principle, the injected raw meal is heated in stages by the upward flow of hot gas, whereby the meal is calcined (deacidified) by up to about 95 %. Depending on the raw mealʻs moisture content and plant capacity, single or dual preheaters with three to five cyclone stages are used.

Demands
The thermochemical loads of a cyclone preheater upper stages are low to moderate.
Therefore, suitable wear-resistant refractory lining materials are the SiO2-based KRONEX, REFRACLAY, and REFRALITE products.
Due to the circulating chlorines and alkalines, the lower cyclone stages are subjected to higher thermochemical loads. Consequently, the wear lining of these plant components requires refractory materials with specifically adapted alumina contents.
The necessary insulating layers are built with shaped and unshaped refractory products containing calcium silicate materials.
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