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Control of the precalcination degree in the precalciner of cement plants is a problem of great importance due to its effect to the quality of the clinker, the consumed energy and the byproducts of the whole cement pyroprocess. Divergence of the desired precalcination degree of the raw mix may cause increased carbon monoxide production which is a significant pollution factor that under certain circumstances may lead to explosive gas mixtures. The basic inputs of the precalciner are the temperature and pressure of the tertiary air, temperature and mass flow rate of the raw mix, and the mass flow rate of the fuel, namely pulverized coal. From these inputs, the coal mass flow rate is the only actuatable one. The outputs of the precalciner are the calcinated raw mix, characterized by its mass flow rate, temperature and degree of precalcination, and the abgasses consisting of oxygen, carbon monoxide, carbon dioxide …