A KINETIC-MODEL FOR COAL REJECT PYROLYSIS AT LOW HEATING RATES

In the present paper, the pyrolysis kinetics of coal reject, a coal mining waste, is studied as part of a project for preparing adsorbent from coal reject material. A thermogravimetric analysis technique (TGA) is used to obtain the kinetic data. In analysis of the kinetic data, a model taking into account both non-isothermal and isothermal phases of the pyrolysis process, as well as the thermoplastic softening effect, has been developed. The kinetic parameters extracted from experimental data for one set of conditions are used in the model to predict the pyrolytic conversion curves for other conditions. A good agreement between the model predictions and experimental data indicates that the model is capable of elucidating the kinetics of coal pyrolysis with softening occurring, and it is useful in the later study of pore structure evolution of coal reject materials.