Encontro de Energia no Meio Rural

Abstract

ARAUZO, J., GONZALO, A., SANCHEZ, J.L. et al. Estudio cinético de la pirólisis de fangos mediante experimentos dinámicos. In Procedings of the 5th Encontro de Energia no Meio Rural, 2004, Campinas (SP) [online]. 2004 [cited 15 October 2024]. Available from: <http://www.proceedings.scielo.br/scielo.php?script=sci_arttext&pid=MSC0000000022004000100056&lng=en&nrm=iso> .

In this work, a pyrolysis model is presented in order to describe the pyrolysis kinetics of sewage sludge. Data were obtained from dynamic experiments, at heating rates of 5 to 20 ºC/min and in a temperature range of 40 to 900ºC. A simple first order or near first order can predict reasonably well the final conversion reached, but, in what concerns the weight loss rate, a simple model cannot predict the peaks obtained in the weight loss rate. As it is shown, the best fit has been obtained by a model which takes into account four fractions which decompose independently following a first order kinetics.

Keywords : Fangos de depuradora; pirólisis; termogravimetría; cinética.