According to the different causes of fire, mine fire can be generally divided into internal (spontaneous combustion) fire and external fire. It is the coal seam with spontaneous combustion tendency. Under appropriate ventilation conditions, physical and chemical changes occur, gathering heat, and reaching the natural point, causing coal combustion fire, that is, mine fire caused by coal spontaneous combustion.<br>The external fire of coal mine is caused by combustion under the action of external fire source (open fire or high temperature)<br>
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