Investigation of combustion kinetics of Umutbaca-lignite by thermal analysis technique
| Autor: | A. Kadir Özer, M. Şahin Gülaboğlu, Jale Naktiyok, Hatice Bayrakçeken |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
020209 energy Diffusion Thermodynamics Autoignition temperature 02 engineering and technology Condensed Matter Physics Kinetic energy Combustion 01 natural sciences 010406 physical chemistry 0104 chemical sciences Combustion kinetics Combustion process Air atmosphere 0202 electrical engineering electronic engineering information engineering Physical and Theoretical Chemistry Thermal analysis |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 129:531-539 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-017-6149-z |
| Popis: | In this study, TG/DSC analysis was used to obtain the information on the combustion behavior, profile, and thermal kinetics of Umutbaca (Turkey) lignite. The thermal analysis data were obtained from 298 to 1273 K at 1, 2.5, 5, and 7.5 K min−1 heating rates in air atmosphere at TG–DSC apparatus. It was seen that when the heating rates increased, the ignition temperature and the burn-out temperature increased. The kinetic parameters were also determined by using two model-free methods [Flynn–Wall–Ozawa (FWO) and Kissinger–Akahira–Sunose (KAS)] and with model-fitting (Coats–Redfern). The activation energies (E a) calculated for KAS and FWO were 118 and 129 kJ mol−1, respectively. ln(A) was 18.09. It was found that diffusion mechanism [D4: (1 − 2α/3) − (1 − α)2/3] depicts the combustion process of Umutbaca-lignite by using Coats–Redfern method. |
| Databáze: | OpenAIRE |
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