在应用综放开采的初期，每当综放工作面停采回撤时，就会发生自燃发火。
In early application of fully mechanized top coal mining, Spontaneous fire took place when the backout of fully mechanized top coal caving face was stopped mining.
油孔附近的油束上边缘处具有合适的燃料浓度和较高的温度，最先发生自燃；
The upper edge of spray near the nozzle would ignite first for its appropriate fuel concentration and higher temperature.
图解的结果，对分析采空区内的瓦斯流动方向和可能发生自燃的位置是有益的。
The result from the diagram analyse would be useful to determination of the possible location of spontaneous combustion and the possible direction of methane flow in the goaf.
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