Rotary Cement Kiln Control for Reducing NOx Emissions to Atmosphere

A logic procedure, including 12 alternatives within 32 activities and 13 decision nodes has been designed/developed/implemented for the rotary cement kiln control aiming at reducing NO_x emissions to atmosphere. The hierarchy of alternatives was evaluated through simple and top-down Kendall´s coefficients of concordance, proved to be of statistical significance. An implementation is presented in the case of fuel substitution including 53=125 fuzzy rules, with linguistic variables defined by five linguistic terms according to a Linkert scale in the antecedent or IF-part and three control variables forming nine commands in the conclusion or THEN-part of each rule. The change of fuzzy rules before and after the implementation is determined qualitatively and quantitatively according to Tseng and Klein and the centroid method