Thermogravimetric characterization of chars of waste from Isabella grape (Vitis labrusca)

Abstract

This article describes the thermogravimetric analysis of carbonized crop residues (branches) and processing of grapes (stalks, skins and seeds). Chars were obtained in a devolatilization system to 600 and 800 °C, under nitrogen atmosphere with 2.00% oxygen in volume. Chars were characterized by proximate and ultimate analysis, and through the dynamic thermogravimetry in an oxidizing atmosphere. From primate analysis was determined the reactivity index (MV/CF), with ultimate analysis is obtained the atomic ratios H/C and O/C, and by means of thermogravimetric analysis the profiles combustion of grape waste is obtained (curves TG-DTG). It was found that the devolatilization process increases the energy value of the waste without devolatilization. Moreover, the reactivity index (MV / CF) and the atomic ratios H/C and O/C, decrease with increasing devolatilization temperature. It was also found that the profiles combustion of all waste have three peaks degradation, consisting of a drying zone and two reaction zones, one of which is release and volatile matter combustion and the other zone is fixed carbon combustion.