Study of the Oxidation Characteristics and CO Production Mechanism of Low-Rank Coal Goaf

Lei Li (), Ting Ren, Xiaoxing Zhong () and Jiantao Wang
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Lei Li: Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
Ting Ren: Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
Xiaoxing Zhong: Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China
Jiantao Wang: Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China

Energies, 2023, vol. 16, issue 8, 1-16

Abstract: Affected by an insufficient understanding of oxidation characteristics and the CO production mechanism in low-rank coal goaf, the safety management of coal spontaneous combustion (CSC) faces severe challenges. In this study, in-depth research was conducted using ambient temperature oxidation (ATO), temperature-programmed, in situ FTIR experiments and DFT simulation after analyzing the oxidation scenario characteristics of low-metamorphic coal goaf. The results show the oxidation of low-rank coal goaf includes two processes of ATO in the dissipation zone and CSC in the oxidation zone. The CO production of ATO increases with a decrease in coal metamorphic degree, and the risk of CSC is influenced by ATO, with an inhibitory effect before the critical temperature, and an encouraging effect after that. The CO production mechanism of low metamorphic coal goaf from ATO to CSC is established. Before the critical temperature, CO mainly comes from the primary aldehyde functional groups, then peroxide-free radicals participate in the reaction, resulting in the production of a large number of secondary aldehyde functional groups, which leads to the sudden change in CO output. The problem of the abnormal, continuous exceedance of CO in the tailgate corner can be solved by developing an ATO inhibitor, which plays an inhibiting role at ambient temperature and decomposes in the event of CSC.

Keywords: low-rank coal; ambient temperature oxidation; spontaneous combustion; CO production; early warning; mechanism (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: 2023
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