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http://dx.doi.org/10.3795/KSME-B.2010.34.7.721

Numerical Study on the Phenomenon of Spontaneous Ignition of Coal Stockpile  

Kim, Chul-Jin (Dept. of Mechanical Engineering, Sejong Univ.)
Park, I-Sun (Dept. of Mechanical Engineering, Sejong Univ.)
Sohn, Chae-Hoon (Dept. of Mechanical Engineering, Sejong Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.34, no.7, 2010 , pp. 721-727 More about this Journal
Abstract
The spontaneous ignition of coal stockpile causes serious safety and economic problems. Such spontaneous ignition occurs in coal stockpile when the rate of heat released by the oxidation of coal is greater than the rate of heat lost to the surroundings. In this study, a two-dimensional unsteady model is adopted for studying spontaneous ignition and the numerical results are compared with experimental results. The numerical results are in a good agreement with the experimental ones. Depending on the porosity, the internal maximum temperature, pressure, and oxygen mass fraction during spontaneous ignition are investigated. On the basis of the numerical results, the transient temperature variations for several shapes of coal stockpiles are analyzed. Further, the physical mechanisms of hot-spot formation and spontaneous ignition are analyzed.
Keywords
Coal Stockpile; Porous Media; Spontaneous Ignition; Hot Spot; Surface Chemical Reaction;
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1 Akgun, F. and Essenhigh, R. H., 2000,"Self-Ignition Characteristics of Coal Stockpile :Theoretical Prediction from a Two-DimensionalUnsteady-state Model," Fuel, Vol. 80, pp. 409-415.   DOI   ScienceOn
2 Salinger, A. G., Aris, R. and Derby, J. J., 1994,"Modeling the Spontaneous Ignition of CoalStockpiles," Journal of AIChE, Vol. 40, No. 6, pp.991-1003.   DOI   ScienceOn
3 Moghtaderi, B., Dlugogorski, B. Z. and Kennedy,E. M., 2000, "Effects of Wind Flow onSelf-Heating Characteristics of Coal Stockpiles,"Trans. IChemE(B), Vol. 78, pp. 445-453.   DOI   ScienceOn
4 Brooks, K., Bradshaw, S. and Glasser, D., 1988,"Spontaneous Combustion of Coal Stockpiles anunusual Chemical Reaction Engineering Problem,"Chemical Engineering Science, Vol. 43, No. 8, pp.2139-2145.   DOI   ScienceOn
5 Brooks, K., Balakotaiah, V. and Luss, D., 1998,"Effect of Natural Convection on SpontaneousCombustion of Coal Stockpiles," Journal of AIChE,Vol. 4, No. 3, pp. 353-364.
6 Ejlali, A., Aminossadati, S. M., Hooman, K. andBeamish, B. B., 2009, "A New Criterion to DesignReactive Coal Stockpiles," International Communicationsin Heat and Mass Transfer, Vol. 36 pp.669-673.   DOI   ScienceOn
7 Nordon, P. and Bainbridge, N. W., 1983, "Heat ofWetting of a Bituminous Coal," Fuel, Vol. 62, No.5, pp. 619-621.   DOI   ScienceOn
8 Krajciova, M., Jelemensky, L'., Kisa, M. andMarkos, J., 2004, "Model Predictions onSelf-Heating and Prevention of Stockpiled Coals,"Journal of Loss Prevention in the ProcessIndustries, Vol. 17, pp. 205-216.   DOI   ScienceOn
9 Nield, D. A. and Bejan, A., 2006, Convection inPorous Media, 3rd Ed., New York, Springer.
10 CFDRC, 2009, CFD-ACE-GUI User Manual, Ver.2009.