Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7162034 | Energy Conversion and Management | 2015 | 9 Pages |
Abstract
The pyrolysis behaviors and kinetics of Eucalyptus leaves (EL), Eucalyptus bark (EB) and Eucalyptus sawdust (ESD) were investigated by using thermogravimetric analysis (TGA) technique. Three stages for EL, EB and ESD pyrolysis have been divided using differential derivative thermogravimetric (DDTG) method and the second stage is the main pyrolysis process with approximately 86.93% (EL), 88.96% (EB) and 97.84% (ESD) weight loss percentages. Kinetic parameters of Gaussian distributed activation energy model (DAEM) for EL, EB and ESD pyrolysis are: distributed centers (E0) of 141.15Â kJ/mol (EL), 149.21Â kJ/mol (EB), 175.79Â kJ/mol (ESD), standard deviations (Ï) of 18.35Â kJ/mol (EL), 18.37Â kJ/mol (EB), 14.41Â kJ/mol (ESD) and pre-exponential factors (A) of 1.15E+10Â sâ1 (EL), 4.34E+10Â sâ1 (EB), 7.44E+12Â sâ1 (ESD). A new modified discrete DAEM was performed and showed excellent fits to experimental data than Gaussian DAEM. According to the modified discrete DAEM, the activation energies are in ranges of 122.67-308.64Â kJ/mol, 118.72-410.80Â kJ/mol and 108.39-192.93Â kJ/mol for EL, EB and ESD pyrolysis, respectively. The pre-exponential factors of discrete DAEM have wide ranges of 4.84E+13-6.12E+22Â sâ1 (EL), 1.91E+12-4.51E+25Â sâ1 (EB) and 63.43-4.36E+11Â sâ1 (ESD). The variation of activation energy versus conversion reveals the mechanism change during pyrolysis process. The kinetic data would be of immense benefit to model, design and develop suitable thermo-chemical systems for the application of Eucalyptus residues.
Related Topics
Physical Sciences and Engineering
Energy
Energy (General)
Authors
Zhihua Chen, Quanjie Zhu, Xun Wang, Bo Xiao, Shiming Liu,