Analysis of the rotary kiln model

The rotary calcination kiln for a production of Titanium dioxide (TiO₂) is a very interesting dynamical system. The titanium dioxide is mostly available in a crystalline form known as anatase. The aim of the calcination process is to produce the titanium dioxide with the rutile content around 98% that has the right pigmentary properties in contrast to the anatase. The system of the rotary calcination kiln has several distributed variables (solid, water, gas, vapour, and temperatures of them). These variables have a complex dependence on each other. The paper analyzes where to put output variable sensors to and shows the based function of the model. Kalman Filter design based on the reduced model of the process is developed because a company, where the system works, would like to improve the control of the titanium dioxide production.