Abstract
The pyrolysis of a suite of brown coal samples and bituminous coal maceral concentrates is investigated by non-isothermal thermogravimetry. The TG data for these coals reveal a two-stage pyrolysis process. The activation energy for the primary pyrolysis stage is considerably higher than that for the secondary pyrolysis stage. It is evident that a particular coal may be characterised by the weighted mean apparent pyrolysis activation energy which correlates with the corresponding specific energy of the coal.
Zusammenfassung
Mittels nichtisothermer Thermogravimetrie wurde die Pyrolyse einer Reihe von Braunkohlenproben und Mazeralkonzentrate aus bituminösen Kohlen untersucht. Die TG-Daten dieser Kohlen weisen einen zweischrittigen Pyrolyseprozeß auf. Die Aktivierungsenergie für den ersten Pyrolyseschritt ist erheblich höher als die des zweiten Pyrolyseschrittes. Es ist offensichtlich, daß eine gegebene Kohle durch den gewichteten Mittelwert der scheinbaren Aktivierungsenergie der Pyrolyse charakterisiert werden kann, welcher mit der entsprechenden spezifischen Energie der Kohle korreliert.
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Dedicated to Professor Dr. H. J. Seifert on the occasion of his 60th birthday
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Ma, S., Hill, J.O. & Heng, S. A kinetic analysis of the pyrolysis of some australian coals by non-isothermal thermogravimetry. Journal of Thermal Analysis 37, 1161–1177 (1991). https://doi.org/10.1007/BF01913852
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DOI: https://doi.org/10.1007/BF01913852