Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action

Yuguo Wu, Yulong Zhang, Jie Wang, Xiaoyu Zhang, Junfeng Wang and Chunshan Zhou
Additional contact information
Yuguo Wu: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yulong Zhang: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jie Wang: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaoyu Zhang: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Junfeng Wang: Shanxi Engineering Research Center for Mine Ventilation and Fire Prevention, Taiyuan 030024, China
Chunshan Zhou: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2020, vol. 13, issue 8, 1-17

Abstract: It is imperative to have an in-depth understanding of the effect of extraneous moisture on the spontaneous combustion of coal not only for the control and prevention of coal spontaneous combustion in the coal mining industry, but also for the optimization design and application of the technological process. In this study, the type of moisture in a coal body has been redefined for the first time from the perspective of disaster prevention and control, i.e., original occurrence of moisture in the coal matrix and the extraneous moisture from the technological process. A suit of coal bodies with different extraneous moisture was prepared by soaking long-flame coal with a low water content. Using a temperature-programmed oxidation test, the effects of extraneous moisture on the temperature increase rate of coal bodies and the emission characteristics of gaseous products during coal spontaneous combustion were studied. Moreover, combined with the characterization of thermal analysis and of pore structure test, the action the mechanism of extraneous moisture on the coal spontaneous combustion process was also explored. The experimental results indicated that the effect of the extraneous moisture content varied with the development of coal spontaneous combustion. In the slow oxidation stage, extraneous moisture played a physical inhibition role in the coal oxidation. In the accelerated oxidation stage, extraneous moisture exhibited a catalytic effect on the coal–oxygen reaction or directly participated in the reaction. After entering the rapid oxidation stage, a delayed effect appeared. When the coal temperature exceeded 180 °C, the spontaneous combustion characteristics of coals with different initial moisture contents gradually tended to achieved balance.

Keywords: coal spontaneous combustion; extraneous moisture; catalytic effect; delayed effect; balancing compensation (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 (5)

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/8/1969/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/8/1969/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:8:p:1969-:d:346262

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().