Modelagem matemática dos perfis de temperatura do gás, do sólido e da parede do forno e dos perfis de concentração das principais espécies químicas presentes no interior do forno rotativo empregado na produção de clínquer

Abstract

Cement is one of the most widely used building materials in the world. The best known type of cement is called Portland. The process of cement production involves numerous and complex endothermic and exothermic reactions. This process is non-trivial and occurs under different temperatures. Thus, the optimization of the cement manufacturing is interesting to the industry. Clinkerization is one of the main steps of cement production and it occurs inside the rotary kiln. In this article, the dry process of clinker production is analyzed in a rotary kiln that works in counter flow. The main phenomena involved in the clinker production are: free residual water evaporation of raw material; decomposition of magnesium carbonate; decarbonation; formation of C3A and C4AF; formation of dicalcium silicate and tricalcium silicate. The main objective of this study is to propose a mathematical model that realistically describes the temperature profile and the concentration of clinker components in a rotary kiln. For this, a mathematical model composed of partial differential equations available in the literature has been adapted. The model was solved using the software Mathcad. The proposed model is satisfactory to describe the temperature profile and the concentration profile of the clinker components inside the rotary kiln.