Thermogravimetric study on the pyrolysis kinetic mechanism of waste biomass from fruit processing industry

Abstract

The detailed kinetic analysis of slow pyrolysis process of apricot (Prunus armeniaca L.) kernal shells has been estimated, under non-isothermal conditions, through thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG). Thermal decomposition was implemented using four different heating rates (5, 10, 15 and 20 ?C min-1), with consideration of how this parameter effects on the process kinetics. The higher heating rates provoke the shift of thermo-analytical curves towards more elevated temperatures. Using isoconversional differential method, the variation of activation energy (Ea) with conversion fraction (?) was detected, and pyrolysis reaction profile was discussed. After resolving the pyrolysis rate curves of individual biomass constituents, the temperature and conversion ranges of their thermal transformations were clearly identified. In the latter stage of analysis, every identified reaction step was considered through mechanistic description, which involves selection of the appropriate kinetic model function. The comparison of the results as well as discrepancies between them has been discussed. The corresponding rate-law equations related to thermal decomposition reactions of all biomass constituents present in the tested agricultural waste material have been identified.

Thermal Decomposition of Olive-Solid Waste by TGA: Characterization and Devolatilization Kinetics under Nitrogen and Oxygen Atmospheres

“…As indicated by other investigator [32], higher heating rates increase DTG peaks, as individual devolatilization peaks overlap as well as this caused the disappearance of the second peak as shown in Figure 4(C) at 40 °C/min.…”

Peach Seeds Pyrolysis Integrated into a Zero Waste Biorefinery: an Experimental Study

“…Despite the plethora of studies on various food waste pyrolysis , few papers can be found in the literature on peach seeds pyrolysis and mainly on pretreated peach seeds, all concerning different cultivars from Serbia and Italy [48][49][50]. Therefore, this study aims to investigate the peach seeds pyrolysis from peach trees cultivated in Greece, with the aim to provide data supporting the pyrolysis process optimization, scale-up, and integration in a biorefinery concept.…”

Kinetic study of different biomass pyrolysis and oxygen-enriched combustion

“…Some studies have focus on pyrolysis kinetic comparison between model-fitting and model-free methods, finding out that model-free methods provide more reliable results [38]. Because of that, model-free methods to determine pyrolysis kinetic parameters have been widely studied, providing information regarding influence of composition in kinetic parameters [39] and identifying pyrolysis process of each biomass component [40]. In the past years, DAEM method use has increased as it can simulate each component behaviour using gaussian distributions [41], however, material decomposition using DAEM is not accurately described [42].…”