Ignition of methane-air mixture by frictional sparks from light alloys
Ignition of methane-air mixture by frictional sparks from light alloys
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DOI：
10.1016/0925-7535(94)90003-5
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发表时间：
1994
期刊：
影响因子：
6.1
通讯作者：
T. Komai;S. Uchida;Minoru Umezu
中科院分区：
文献类型：
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作者：
T. Komai;S. Uchida;Minoru Umezu
处理易燃或易爆气体的行业必须采取措施防止因机械摩擦和冲击而引起的火源。甲烷空气混合物最危险的点火源之一是轻合金摩擦撞击产生的火花。作者进行了实验室规模的实验，以阐明摩擦火花的特性以及可燃性与实际条件之间的关系。使用跌落式试验装置，将轻合金样品冲击到生锈的钢板上。因此，着火概率很大程度上受到一些冲击条件的影响，即下落高度、样品重量和表面粗糙度。获得50%点燃概率所需的冲击能量可作为估算轻合金可燃性的指标。三种轻合金的可燃性和镁含量之间存在一定的相关性。镁基轻合金中添加少量铍后，轻合金的着火率有所降低，但Al-Si系轻合金的着火率并未出现明显下降。
Industries handling flammable or explosive gases have to take measures against ignition sources due to mechanical friction and impact. One of the most hazardous ignition sources to methaneair mixtures are sparks induced by frictional impact from light alloys. The authors conducted a laboratory scale experiment to clarify the characteristics of frictional sparks, and the relation between the incendivity and practical conditions. A drop type testing apparatus was used, by which light alloy samples made an impact on a rusted steel plate. As a result, probability of ignition was greatly affected by some impact conditions, i.e., dropping height, weight of samples and surface roughness. The impact energy required to obtain 50% probability of ignition can be used as an index for estimating the incendivity of light alloys. Some correlation between the incendivity and the content of magnesium was found for three kinds of light alloys. The incendivity of light alloys became lower when a small quantity of beryllium was added to Mg base light alloys, but clear decrease of the incendivity did not appear as for Al-Si type light alloys.