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

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• 作者：Runsheng Xu ; Jianliang Zhang ; Guangwei Wang…
• 关键词：COREX ; Lump coal ; Rapid pyrolysis ; Master curve method ; Iso ; conversional method
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：123
• 期：1
• 页码：773-783
• 全文大小：1,527 KB
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• 作者单位：Runsheng Xu (1)
  Jianliang Zhang (1)
  Guangwei Wang (1)
  Haibin Zuo (2)
  Pengcheng Li (1)
  Haiyang Wang (1)
  Hao Lin (1)
  Siyuan Liu (1)
  
  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

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.