International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Study on the oxidation and heating characteristics of residual coal in goafs under different air-leakage conditions

The spontaneous combustion of broken coal is one of the main causes for mine safety accidents in goafs. To determine the effect of different air-leakage conditions on the spontaneous combustion of leftover coal, the air-leakage passage of the goaf was designed based on the principle of Sudoku grid in an inflammable coal seam. The temperature rise during the auto-ignition oxidation of coal was studied using a self-built experimental platform. By changing the air flow rate, the laws of the change in the oxygen consumption rate and the heat-release intensity with the coal temperature were analyzed. Results show that the oxygen consumption rate had three obvious peaks at 48°C, 75°C and 105°C, respectively. Above 80°C, spontaneously combustion of the experimental coal samples began. The exothermic intensity increased exponentially with the rise of temperature. Furthermore, an exponential relationship was observed between the air supply at the working face and the spontaneous combustion of broken coal in the goaf. In addition, the increase in air supply in the fully-mechanized mining face increased the width of the oxidation zone.
PAPER REVISED: 2020-08-29
PAPER ACCEPTED: 2020-09-22
  1. Man, T.L. and Wang W., Numerical simulation of three-dimensional air leakage flow field in goaf based on CFD(in Chinese), Coal engineering, 51(2019)9, pp. 142-146
  2. 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
  3. 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
  4. Pan, R., et al., The inducement of coal spontaneous combustion disaster and control technology in a wide range of coal mine closed area, Environmental Earth Sciences,77(2018), pp. 374-381
  5. Wang, K., et al., Effects of pre-oxidation temperature on coal secondary spontaneous combustion, Journal of Thermal Analysis and Calorimetry, 138 (2019), pp. 1363-1370
  6. Choi, H. K. et al., Low Temperature Oxidation and Spontaneous Combustion Characteristics of Upgraded Low Rank Coal, International Symposium on Coal Combustion, 8(2013), pp. 75-79
  7. Zhang, M., et al., Numerical Analysis of Air Leakage Characteristics of Coal Seam Goaf Close to Thin Band, Geotechnical and Geological Engineering ,36(2018), pp. 3149-3158
  8. Li, M., et al., Analysis on air-leakage law of goaf in condition of ascending mining for top-coal caving, Journal of Coal Science and Engineering (China),15(2009), pp.81-84
  9. Beamish, B. B., et al., Spontaneous combustion propensity of New Zealand coals under adiabatic conditions, International Journal of coal Geology, 45(2001), pp. 217-224
  10. Pan, R., et al., Experimental study on the effects of chemical composite additive on the microscopic characteristics of spontaneous combustion coal, Environmental Science and Pollution Research,27(2020), pp. 5606-5619.
  11. Zhang, M.G., et al., Numerical Analysis of Air Leakage Characteristics of Coal Seam Goaf Close to Thin Band, Geotechnical and Geological Engineering,36(2018), pp. 3149-3158.
  12. Deng, J., et al.,Thermal analysis of spontaneous combustion behavior of partially oxidized coal, process safety and environmental protection, 104(2016), pp. 218-24
  13. Zhang, J., et al., Analysis of mine's air leakage based on pressure gradient matrix between nodes, Journal of Coal Science and Engineering (China), 14(2008), pp. 443-446
  14. Li, Z., et al., Free radical reaction characteristics of coal low-temperature oxidation and its inhibition method, Environmental Science and Pollution Research, 23(2016), pp. 23593-23605
  15. Wen, H., et al., Technique of measurement and test of coal spontaneous combustion characteristic and numerical analysis, Journal of university of science and technology Beijing, 23(2001), pp. 499-501
  16. Jo, W., et al., A comparison of spontaneous combustion susceptibility of coal according to its rank, Korean Journal of Chemical Engineering, 30(2013), pp. 1034-1038
  17. Qin,Y.P., et al., Study on the influence of air flow on spontaneous combustion characteristics of remnant coal(in Chinese), Coal Mines Sfety, 45(2014)1, pp. 34-38
  18. Xu,J.C., et al., Judgment Theory of Coal Spontaneous Combustion Hazardous Area, Coal Industry Press, Beijing, 2001
  19. Xu,J.C., et al., Determination and calculation of low-temperature oxidation heat release intensity of loose coal(in Chinese), Journal of China Coal Society, 25(2000)4, pp.387-391