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- Title
Isothermal kinetic analysis on fast pyrolysis of lump coal used in COREX process.
- Authors
Xu, Runsheng; Zhang, Jianliang; Wang, Guangwei; Zuo, Haibin; Li, Pengcheng; Wang, Haiyang; Lin, Hao; Liu, Siyuan
- 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. In addition, the average activation energy calculated by iso-conversional method is 47.06 kJ mol, which proves that the kinetics equation determined by the master curve method is reliable.
- Subjects
ISOTHERMAL flows; PYROLYSIS; CHEMICAL processes; TEMPERATURE effect; CHEMICAL kinetics
- Publication
Journal of Thermal Analysis & Calorimetry, 2016, Vol 123, Issue 1, p773
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-015-4972-7