煤尘爆炸及条件--qsf999的安全生产小屋

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煤尘爆炸及条件 | 2011-8-2 9:30:00

煤尘爆炸及条件

煤是可燃物质，当它破碎成细小颗粒后，表面积大大增加，氧化能力显著增强。受热时单位时间内能够吸收更多的热量，在较低的温度（300～400℃）时，就能放出大量的可燃性气体，聚集于尘粒的周围。这类可燃性气体一经与空气混合便在高温作用下吸收能量，形成一定数量的活化中心。如果这时氧化反应放出的热量能够有效地传播给附近的煤尘，这些煤尘也就迅速变热分解，跟着燃烧起来。此种过程连续不断地进行，氧化反应越来越快，温度越来越高，活化中心越来越多，达到一定程度时，便能发展为剧烈的爆炸。

煤尘爆炸必须具备下列三个条件：

（1）煤尘本身具有爆炸性。煤尘的爆炸性与挥发分含量有关，同样情况下，挥发分含量高的煤，爆炸性强。

（2）煤尘必须悬浮于空气中并达到一定浓度。根据试验，我国煤尘的爆炸下限浓度：褐煤为45～55克／立方米；烟煤为110～335克／立方米。上限浓度一般为1500～2000克／立方米。

（3）有一个能点燃煤尘爆炸的高温热源。其引燃温度变化范围较大，一般为700～800℃，有时达1100℃。

By:qsf999 | 阅读全文 | 回复(15) | 引用通告 | 编辑

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Re:在漫画中识别身边的违章 | 2016-10-13 2:56:16

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