Experimental Study on the Inhibition Effects of Nitrogen and Carbon Dioxide on Coal Spontaneous Combustion

Yi Zhang, Jun Xu and Deming Wang
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Yi Zhang: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Jun Xu: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Deming Wang: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2020, vol. 13, issue 20, 1-14

Abstract: Inert gases can effectively inhibit coal spontaneous combustion. In this paper, the inhibition effect of inert gases (N 2 and CO 2 ) on coal spontaneous combustion was studied. In the low-temperature oxidation stage, the constant-temperature heat release and apparent activation energy of coal sample were measured and calculated by the C80 micro-calorimeter. In the high-temperature combustion stage, the critical temperature, maximum peak temperature, ignition temperature, and burn-out temperature of coal samples were analyzed by the synchronous thermal analyzer. The results demonstrate that with the decrease of O 2 concentration, the oxidation heat release of coal samples drops gradually while the apparent activation energy increases gradually. In the N 2 and CO 2 atmospheres, as the O 2 concentration is reduced to 1.5% and 3%, respectively, the value of apparent activation energy changes from negative to positive, and the spontaneous reaction transits to a nonspontaneous reaction. The TG-DTG (thermogravimetric-derivative thermogravimetric) curve of coal sample in the high-temperature combustion stage indicates that the critical temperature exhibits a W-shaped trend with the decrease of O 2 concentration, which also leads to gradual increases of maximum peak temperature, ignition temperature, and burn-out temperature. The above results signify that increasing the inert gas concentration can gradually reduce the oxidation and combustion rate and improve the inhibition effect on coal spontaneous combustion. In addition, when the O 2 concentration is the same, the inhibition effect of CO 2 on coal spontaneous combustion is superior to that of N 2 .

Keywords: coal spontaneous combustion; inhibition effect; nitrogen; carbon dioxide (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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