Uso de aditivo para purga de enxofre em fornos de clínquer utilizando coque como combustível principal: um estudo de caso

Abstract

The petroleum coke, nowadays, is the most used fuel in the cement industry. It is a subproduct of the oil refining, which has a high calorific energy, low cost and its sulfur concentration is given as a function of the kind of petroleum from which the coke is derived from, and can be classified as low sulfur compound or high sulfur compound. The high coke sulfur usually has its usage restrict in all kind of processes, being a low cost alternative to the cement industry rather then other energy sources. Nevertheless the optimization of the clinkerization process is always tried in order to allow a higher sulfur input, maximizing the usage of cheaper fuel richer in sulfur, minimizing the impacts in the quality of the emissions to the environment.The objective of this work is maximize the substitution of the lower sulfur coke for the high sulfur coke using an additive in the fuel of clinker oven, aiming to allow the elimination of sulfur from the clinker incorporated system, by adding the additive in the main fuel(coke), making three scenarios, starting with the baseline and other two tests adding high sulfur fuel gradually until the complete substitution. The usage if the additive in the process fulfilled the initial goal of allowing 100% of the usage from high sulfur coke, where it was possible to see on the process parameters an improvement indicated by the depression on the oven entering working with lower values implying in a circuit with less incrustations, corroborated by the physical observations of the collage on the smoke box, following the scanner of the oven shell and its was confirmed by the higher oxygen levels. Also it was possible to observe that the levels of production where maintained and there was not any significant increase on the SOx emission, keeping its values bellow the limit for the factory work. It was possible to obtain a 18,31% economy on the fuel costs.