Thermal and kinetic analysis of the pyrolysis of coals. Final report. [In nitrogen]

TL;DRAbstract

The thermal decomposition (pyrolysis) of nine bituminous coals of the United States was investigated in a nitrogen atmosphere. Weight loss and rate of weight loss were measured at heating rates of 160, 80, 40, 20 and 10/sup 0/C/min. The qualitative behavior of these data confirmed observations reported by others on similar coals in that the major devolatilization occurred between 300 and 700/sup 0/C with the peaks shifting to higher temperatures at faster heating rates. Kinetic parameters for each heating rate were derived from these measurements by means of a model which has been used successfully to describe the pyrolysis of woods and wildland fuels. Energetic effects during pyrolysis were measured directly up to 727/sup 0/C on a Perkin-Elmer differential scanning calorimeter (DSC-2) at heating rates of 320, 160 and 40/sup 0/C/min. The decomposition of bituminous coals is endothermic up to 500/sup 0/C and exothermic thereafter; the energy of pyrolysis is more exothermic with decreasi

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