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Research Article

Analysis of Coal Spontaneous Combustion by Thermodynamic Methods

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Pages 2305-2330 | Received 18 Dec 2019, Accepted 22 Feb 2020, Published online: 02 Mar 2020
 

ABSTRACT

In order to better determine the spontaneous combustion tendency of coal, two types of heating rate methods, namely, single and multi-scan methods, commonly used in the field of spontaneous coal combustion are summarized based on a thermal analysis kinetics method. The single scanning rate method mainly included the Coats–Redfern, Achar, universal equation, MacCallum–Tanner, Madhusudanan–Krishnan–Ninan, and non-isothermal thermogravimetric and differential scanning calorimetric methods. The multi-scan rate method mainly included the Flynn–Wall–Ozawa, Kissinger–Akahira–Sunose, Starink, and Friedman methods. For each of these methods, their respective theoretical basis, advantages, and disadvantages were described. In addition, the Popesc and Malek methods were used to determine the optimal reaction kinetic model. In view of the compensation effect, the invariable activation energy Einv and the pre-exponential factor lnAinv at different heating rates were determined. For each method, the oxygen weight gain stage of Shaanxi bituminous coal was selected as an example interpretation.

Additional information

Funding

This work was supported partly by the “Tianjin Science and Technology Plan Major Special Project (Grant No.18ZXAQSF00020)”, partly by the “Tianjin Science and Technology Plan Key R&D Program (Grant No.18YFJLCG00140)”, partly by “the general project of Tianjin Natural Science Founds (Grant No. 19JCYBJC23000)”, partly by “131 Innovative Talents Cultivation Engineering for Tianjin Province, China” and partly by “Training Program for Innovative Research Team in Tianjin Institutions of Higher Education” (Grant No.TD13-5021).

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