Abstract
The isothermal pyrolysis characteristics of lump coal used in COREX was studied by the self-developed thermos-gravimetry analysis device varying the temperature from 900 to 1200 °C. The results indicated that pyrolysis temperature had a significant influence on the pyrolysis rate of the lump coal, but have a little influence on the weight loss ratio. The results obtained by nonlinear fitting of mechanism functions indicated that the pyrolysis process of lump coal satisfied the two-dimensional random nucleation and nuclei growth model. The pyrolysis kinetics equation is \( \frac{{{\text{d}}\alpha }}{{{\text{d}}t}} = - 1.03082\,\exp ( - \frac{46630}{8.314T})[(1 - \alpha )( - \ln (1 - \alpha ))^{0.5} ] \), and the pyrolysis activation energy is 46.63 kJ mol−1. In addition, the average activation energy calculated by iso-conversional method is 47.06 kJ mol−1, which proves that the kinetics equation determined by the master curve method is reliable.
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