Methane explosion accidents occur frequently, and accurate and real-time detection and early warning of methane concentration are the effective means of preventing these accidents.

瓦斯爆炸事故频繁发生，对瓦斯浓度进行准确、实时检测和预警是治理瓦斯危害的有效手段。

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Methane explosion triangle method, which is commonly applied to judge the explosion risk of mixed inflammable gases in the mine fire district, considers only the main component gas.

矿井火区可燃性混合气体爆炸危险性的判断，目前常用单纯的瓦斯爆炸三角形判别法。

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Mining experts said it could have been a methane gas explosion, a coal dust explosion, or a combination of both.

BBC: New Zealand miners missing after explosion

At 01:30 on Tuesday a methane and coal dust explosion occurred in the pit's South District.

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