Química Nova | |
A thermogravimetric analysis of the combustion of a Brazilian mineral coal | |
关键词: coal; combustion; kinetics; | |
DOI : 10.1590/S0100-40422008000100021 | |
来源: DOAJ |
【 摘 要 】
Knowledge of coal combustion kinetics is crucial for burner design. This work aims to contribute on this issue by determining the kinetics of a particular Brazilian bituminous coal. Non-isothermal thermogravimetry was applied for determining both the pre-exponential factor and the activation energy. Coal samples of 10 mg and 775 mm mean size were used in synthetic air atmospheres (21 % O2). Heating rates from 10 to 50 ºC/min were applied until the temperature reached 850 ºC, which was kept constant until burnout. The activation energy for the primary and the secondary combustion resulted, respectively, in 135.1 kJ/mol and 85.1 kJ/mol.
【 授权许可】
Unknown