Isothermal kinetic analysis on fast pyrolysis of lump coal used in COREX process

摘要

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 A degrees 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 , 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.