A thermogravimetric analysis of the combustion of a Brazilian mineral coal

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....

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Bibliographic Details
Published in:Química Nova 2008, Vol.31 (1), p.98-103
Main Authors: Silva Filho, Claudionor Gomes da, Milioli, Fernando Eduardo
Format: Article
Language:English
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
coal
combustion
kinetics
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Summary: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.
ISSN:0100-4042
1678-7064
1678-7064
DOI:10.1590/S0100-40422008000100021