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In this work, an one-dimensional analysis on spontaneous combus-tion in a coal stockpile was conducted using a commercial software gPROMS<sup>®</sup> based on assumption suggested by Arioy and Akgun. According to them, it is as-sumed that there is temperature difference between the surface of coal particle and the gas surrounded around the particle, and it is also assumed that the ve-locity of the gas is constant and thus oxygen is fed to the stockpile with same velocity. The higher temperature zone is formed to the surface of the coal stock-pile at the initial phase and it became deepen as time is taken. Finally it was found that the temperature difference between coal particle and the gas was cal-culated as 57°C and spontaneous combustion have not been occurred during 6 months since coal was piled in the stock.

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