1990年以来，淮南矿区11个矿井共发生自燃火灾49起，自燃发火率平均为每百万吨产煤量0．53次。
Spontaneous combustion broke for 49 in the 11 coal mines at Huainan mine area sine 1990. The spontaneous combustion broken ratios average 0.53 times per million ton coal products.
1990年以来，淮南矿区11个矿井共发生自燃火灾49起，自燃发火率平均为每百万吨产煤量0．53次。
Spontaneous combustion broke for 49 in the 11 coal mines at Huainan mine area sine 1990. The spontaneous combustion broken ratios average 0.53 times per million ton coal products.
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