Identification of potential for methane ignition by rock friction in Australian coal mines
Identification of potential for methane ignition by rock friction in Australian coal mines
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DOI：
10.1016/s0166-5162(00)00025-2
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发表时间：
2001-01-01
影响因子：
5.6
通讯作者：
Cohen, DR
中科院分区：
文献类型：
--
作者：
Ward, CR;Crouch, A;Cohen, DR
澳大利亚地下煤矿中不同岩石类型通过与采矿设备或其他岩石材料的摩擦接触而点燃含甲烷气氛的相对倾向，已通过实验室测试使用仪器化的转轮装置进行了评估。一个五点易燃性分类已开发的岩石测试，并比较岩相组成，矿物学和相关的化学性质的结果。新南威尔士州煤矿最近的点火经验也被考虑在内。随着其他来源的点火的逐渐减少，摩擦效应现在是现代地下煤矿中最常见的甲烷点火源。砾岩、粘土和碳酸盐含量低的岩屑或石英砂岩以及硅质燧石凝灰岩似乎代表了顶底板地层中最具潜在易燃性的材料，沿着可能发生在煤层本身中的硅质或黄铁矿碎屑。在岩石与岩石接触过程中，超过1500摄氏度的温度可能在不到1秒的时间内产生，点火来自接触点或相关的热迹，而不是来自摩擦过程中喷出的白炽颗粒（"火花"）。岩石对岩石测试期间产生的平均温度和动摩擦系数似乎也与摩擦燃烧特性有关。(C)2001 Elsevier Science B.V.保留所有权利。
The relative propensity for the different rock types in Australian underground coal mines to ignite methane-bearing atmospheres by frictional contact, either with mining equipment or with other rock materials, has been evaluated by laboratory testing using an instrumented rotating-wheel apparatus. A five-point incendivity categorisation has been developed for the rocks tested, and the results compared to petrographic composition, mineralogy and related chemical properties. Recent experience with ignitions in New South Wales collieries has also been taken into account. With the progressive decline in ignitions from other sources, frictional effects are now the most common source of methane ignition in modern underground coal mines.Conglomerates, lithic or quartzose sandstones with low clay and carbonate contents, and siliceous cherty tuffs appear to represent the most potentially incendive materials in roof and floor strata, along with siliceous or pyritic impregnations that may occur in the coal seam itself. Temperatures in excess of 1500 degreesC may be developed within less than 1 s during rock-on-rock contacts, with ignitions emanating from the contact point or related heat trail rather than from incandescent particles ("sparks") ejected during the friction process. The average temperature and the coefficient of dynamic friction developed during rock-on-rock testing also appear to be related to frictional incendivity characteristics. (C) 2001 Elsevier Science B.V. All rights reserved.