THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Simulation of fire smoke disaster in a goaf during the closure process

ABSTRACT
Closing the fire area is a common disaster-relief measure when coal spontaneously combusts in a goaf. However, the closure process will also increase the risk of gas explosion. To understand the gas migration rules and disaster-causing effects in a closed goaf, this study simulates the spontaneous combustion of leftover coal when the goaf is closed. The simulation was visualized on the PyroSim interface. After identifying the distribution laws of the temperature field, CO concentration field, and O2 concentration field, a disaster risk analysis was carried out The CO concentration presented two different changing trends over time. Both trends were approximately linear. A potential high-temperature fire source was identified at depths of 50-60 m in the goaf (approximately 3 m above the floor). Before the goaf closure was completed, likely gas-explosion sites were found at depths of 30, 50, and 80 m from the working face. Monitoring the gas and oxygen concentrations is especially important in these areas.
KEYWORDS
PAPER SUBMITTED: 2020-06-30
PAPER REVISED: 2020-09-05
PAPER ACCEPTED: 2020-09-25
PUBLISHED ONLINE: 2020-10-31
DOI REFERENCE: https://doi.org/10.2298/TSCI200630323Z
REFERENCES
  1. Choi, H.Y., et al., Comparison of spontaneous combustion susceptibility of coal dried by different processes from low-rank coal, Korean Journal of Chemical Engineering, 31(2014), 12, pp. 2151-2156
  2. Deng, J., et al., Effects of pyrite on the spontaneous combustion of coal, International Journal of Coal Science & Technology, 2(2015)4, pp. 306-311
  3. LU, W., et al.,. Method for prevention and control of spontaneous combustion of coal seam and its application in mining field, International Journal of Mining Science and Technology,27(2017)5, pp. 839-846
  4. Wang, J.G., et al., Numerical Simulation of Smoke Variation During Fire in Intake Airways on a Coal Mining Face. Proceedings of the 11th International Mine Ventilation Congress, Chang X, China, 2019, Vol. 1, pp.652-663.
  5. Tian, S.C., et al., Pyrosim-based wind speed on the spread of mine fires, Metal Mine, 2(2020), pp. 199-205
  6. Yuan, L., et al., Computational fluid dynamics study on the ventilation flow paths in long wall gobs,. Proceedings and Monographs in Engineering: Water and Earth Sciences, 2006, Vol. 1, pp.547-558
  7. Taraba, B., et al., Effect of long wall face advance rate on spontaneous heating process in the gob area-CFD modeling, Fuel, 90(2011)8pp. 2790-2797
  8. Liu, X.K., et al., Simulation of goaf heating law and the fire cooling effect during methane drainage in high level laneway, Journal of Coal Science and Engineering ,1(2013), pp. 325-331
  9. Zhang, C., et al., Numerical Simulation of Broken Coal Strength Influence on Compaction Characteristics in Goaf, Natural Resources Research, 29 (2020), pp. 2495-2511
  10. Sipilä, J., et al., Risk and mitigation of self-heating and spontaneous combustion in underground coal storage, Journal of Loss Prevention in the Process, 25(2012), pp. 617-622
  11. Adam, D., et al., (2018) Forecast of methane emission from closed underground coal mines exploited by longwall mining: a case study of Anna coal mine, Journal of Sustanable Forestry, 17(2018)4, pp. 184-194
  12. Zhou, X., et al., Influences of sealing fire zone in high gas mine on impact factors of gas explosion limit, Combustion, Explosion, and Shock Waves, 33(2013)4, pp. 351-356
  13. Niu, H., et al., Influence of closed sequence on distribution of gas in coal mine fire zone, Journal of Central South University,47(2016)9, pp.3239-3245
  14. Arif, W., et al., (2015) Assessment of air dispersion characteristic in underground mine ventilation: field measurement and numerical evaluation. Process Safety and Environmental Protection 93(2015)1, pp. 173-181
  15. Scott, B., et al., Geological and geotechnical aspects of underground coal mining methods within Australia, Environmental Earth Sciences ,60 (2010), pp. 1007-1019
  16. Schmidt M, Lohrer C, Krause U. Self-innition of dust at redued volume frations of ambient oxygen. Journal of Loss Prevention in the Process Industries, 16 (2003), pp. 141-147