期刊
ENVIRONMENTAL EARTH SCIENCES
卷 75, 期 21, 页码 -出版社
SPRINGER
DOI: 10.1007/s12665-016-6173-5
关键词
Mine fires; Spontaneous combustion of coal; Large-area goaf; High-temperature zone; Liquid nitrogen
资金
- National Natural Science Foundation of China [U1361213, 51476184]
- Jiangsu Province Outstanding Youth Scientific Fund [BK20140005]
- Fundamental Research Funds for the Central Universities [2015QNA02]
- Innovative Research Team of China University of Mining and Technology [2015ZY002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Goaf fires are serious hazards in coal mines, especially in the closely spaced shallow coal seams of northwestern China, where spontaneous combustion of coal occurs frequently. A numerical simulation method was developed for a large-area spontaneous combustion fire in the goaf of the 12306 fully caved face at Bulianta coal mine in the Shendong mining area. Theoretical and geometrical models were developed to rapidly locate the high-temperature zone of the fire by simulating the oxygen concentrations and temperature distributions in the goaf. The effectiveness of liquid nitrogen perfusion was also assessed. Field observations showed that the results from the theoretical study were accurate and reliable. The fire was rapidly extinguished by pouring liquid nitrogen at a high flow rate into the high-temperature region of the fire. CO concentration dropped from >10,000 to <5 ppm in the goaf, and the temperature fell from >160 to about 20 degrees C. The 22305 face below the 12306 goaf was subsequently safely reopened and quickly returned to production.
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