Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action
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...
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MDPI AG
2020-04-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/8/1969 |
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| author | Yuguo Wu Yulong Zhang Jie Wang Xiaoyu Zhang Junfeng Wang Chunshan Zhou |
| author_facet | Yuguo Wu Yulong Zhang Jie Wang Xiaoyu Zhang Junfeng Wang Chunshan Zhou |
| author_sort | Yuguo Wu |
| collection | DOAJ |
| description | 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. |
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| format | Article |
| id | doaj.art-67ac1f4294b243f98d68c8d45ef34b5e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T20:26:07Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-67ac1f4294b243f98d68c8d45ef34b5e2023-11-19T21:47:21ZengMDPI AGEnergies1996-10732020-04-01138196910.3390/en13081969Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of ActionYuguo Wu0Yulong Zhang1Jie Wang2Xiaoyu Zhang3Junfeng Wang4Chunshan Zhou5College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Engineering Research Center for Mine Ventilation and Fire Prevention, Taiyuan 030024, ChinaCollege of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaIt 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.https://www.mdpi.com/1996-1073/13/8/1969coal spontaneous combustionextraneous moisturecatalytic effectdelayed effectbalancing compensation |
| spellingShingle | Yuguo Wu Yulong Zhang Jie Wang Xiaoyu Zhang Junfeng Wang Chunshan Zhou Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action Energies coal spontaneous combustion extraneous moisture catalytic effect delayed effect balancing compensation |
| title | Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action |
| title_full | Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action |
| title_fullStr | Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action |
| title_full_unstemmed | Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action |
| title_short | Study on the Effect of Extraneous Moisture on the Spontaneous Combustion of Coal and Its Mechanism of Action |
| title_sort | study on the effect of extraneous moisture on the spontaneous combustion of coal and its mechanism of action |
| topic | coal spontaneous combustion extraneous moisture catalytic effect delayed effect balancing compensation |
| url | https://www.mdpi.com/1996-1073/13/8/1969 |
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