- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | ZHAO Jingyu, ZHANG Tinghao, SONG Jiajia, GUO Tao, ZHANG Yuxuan, DENG Jun. Dynamic Characteristics for Evolution Process of Semi-closed Coal Fire[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 117-124, 149. doi: 10.3969/j.issn.0258-2724.20210878
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In order to study the evolution law of oxygen and temperature in the process of spontaneous combustion of loose coal, an experimental system for semi-closed coal fire evolution was built to explore the changes of oxygen concentration and temperature in the process of coal from normal temperature to ignition point, and to establish the natural oxygen absorption intensity model for the spontaneous combustion process of loose coal. The model analyzes the characteristics of oxygen distribution and the horizontal and longitudinal phase movement characteristics of the temperature field during the spontaneous combustion. The results show that the semi-closed coal fire evolution experimental system can better reproduce the natural oxygen absorption process in coal spontaneous combustion, which proves that the natural oxygen absorption effect contributes to the spontaneous combustion of coal mass. During the spontaneous combustion of coal mass, the temperature change time lags behind oxygen concentration change time, and the lag time difference increases with the coal seam depth. The migration trend in the high-temperature area in the horizontal direction is mainly affected by the distribution of cracks and pores at coal body. The natural oxygen absorption intensity and the peak temperature at measuring points decrease with the coal body depth growing, and the oxygen concentration in the lower area without spontaneous combustion is greater than that in the upper layer. The research results provide a theoretical basis for the prevention and control of spontaneous combustion of loose coal under mining, transportation and storage conditions.
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