矿井瓦斯形成及特征--qsf999的安全生产小屋

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矿井瓦斯形成及特征 | 2011-7-30 10:53:00

矿井瓦斯形成及特征

    矿井瓦斯是井下有害气体的总称。但是，在这些气体中的主要成分是沼气，所以，通常所谓矿井瓦斯，就是指沼气。
    古代植物在成煤过程中，经厌氧菌作用，植物的纤维质分解产生大量瓦斯。此后，在煤的碳化变质过程中，随着煤的化学成分和结构的变化，继续有瓦斯不断生成。在长期的地质年代里，由于沼气的比重小，扩散能力强，地层又具有一定的透气性，以及地层的隆起、侵蚀，大部分瓦斯都已逸散到大气中去，只有一小部分至今还被保存在煤体和围岩内。
    矿井瓦斯是一种无色、无味、无臭的气体。它难溶于水，扩散性比空气高。瓦斯无毒，但当浓度高时，会引起窒息。当其在空气中具有一定浓度（5％～16％），并遇到高温（650～750℃）时能引起爆炸，对安全生产威胁很大。

By:qsf999 | 阅读全文 | 回复(12) | 引用通告 | 编辑

Re:在漫画中识别身边的违章 | 2017-2-20 16:49:04

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Re:在漫画中识别身边的违章 | 2017-2-18 0:04:22

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Re:在漫画中识别身边的违章 | 2016-10-18 23:12:18

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Re:在漫画中识别身边的违章 | 2016-10-14 18:00:25

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