Key technologies for extinguishing large-area goaf fires in closely spaced shallow coal seams
Résumé
The large spontaneous combustion fire in the goaf of the 22305 fully caving face at the Bulianta coal mine in north-western China was examined. The cause of spontaneous combustion in the goaf of closely spaced shallow coal seams was analysed. To deal with the problem of significant air leakage combined with a large fire area and a hidden fire source that could easily re-ignite, a proposed set of key techniques for extinguishing goaf fires was put into practice. This mainly included sealing the air leakage cracks, high-flow injection of liquid nitrogen, and infusion of a large quantity of foam inhibitor. The results showed that these measures rapidly extinguished the goaf fire, lowering the CO concentration from 43,051 ppm to ＜ 25 ppm and reducing the temperature in the goaf to about 20°C. The 22305 face was subsequently safely reopened and quickly put back into production within three months.Références
Tang, X. and Li, S. (2013). Research on the measures of energy problem of industrialization in our country, Economic Issue, (1): 124-126.
Zhang, H. (2012). Research of promoting the rise of Central China, Beijing: Graduate school of Chinese academy of social sciences.
Luo, H. and Liang, Y. (2003). Current Status and Perspective of Forecast and Predict ion Techniques for Spontaneous Combustion of Coal, China Safety Science Journal, 3(13):76-78.
Gu, D. and Zhang, J. (2012). Modern Coal Mining Affected to Underground Water Deposit Environment in West China Mining Area , Coal Science and Technology, 40(12):12-15.
Kuenzer, C., Wesslin, W., Zhang J. et al. (2007) Concepts for Green House Gas Emission Estimation of Underground Coal Seam Fires, Geophysical Research Abstracts of the EGU General Assembly, 164-170.
Huang, Q. (2011). The ecological environmental impact assessment study of coal mine planning, Chengdu: Southwest Jiaotong University.
Wang, H. (2009). The research of coal mine fire safety and the phenomenon of spontaneous combustion in China, Science & Technology for Development, (12):12-15.
Wang, B., An, S. and Guan W., et al. (2012). Detection and Governance of the Spontaneous Combustion High-temperature Region in
Shallow Burial and Thick Coal Seam. Safety in Coal Mines, 43(12):45-49.
Wang, D. (2008). Mine fires, Xuzhou: China University of Mining and Technology Press.
Yuan, Z. and Wan, L. (2013). Application of liquid nitrogen system to control fire in coal mine. Coal Engineering, (3):45-49.
