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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Spontaneous combustion risk in South African coalfields
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Spontaneous combustion risk in South African coalfields

机译：南非煤田的自燃风险

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The risk of spontaneous combustion is well known in the South African coal mining industry. In the coming years it is very possible that the incidence of spontaneous combustion will increase from current levels, due to factors such as an increased rate of mining, re-working of previously mined seams, more stooping and total extraction for underground mines, and higher stripping ratios for surface mines, leading to more spoils. It is also fairly certain that coal mining will face tougher environmental emissions legislation in the near future. To determine the areas where the risks of spontaneous combustion are high, it is necessary to improve on our current laboratory procedures for testing and evaluating coal samples, combining the results with site and field data, and if necessary revising the laboratory rating system to refine our understanding of South African conditions.Currently, laboratory tests are conducted hi order to determine both the Wits-EHAC index and the crossing-point temperature which, when combined, give an indication of the spontaneous combustion propensities of the coal samples. This procedure has enabled the establishment of a database of results to review and evaluate South African coal seams. Using this database, the high-risk areas hi terms of spontaneous combustion are identified. Tests have been undertaken for five consecutive years, between 2008 and 2012. In total, 119 coal samples from different coal seams and production coalfields have been analysed and classified through a series of laboratory tests. A comprehensive database of these results is available, and is continually being updated as new test results are added. This database will continue to expand, and to provide the basis for an unproved risk evaluation methodology for spontaneous combustion.
机译：自燃的风险在南非煤矿行业中众所周知。在未来几年中，由于诸如开采率提高，先前开采的煤层的返工，地下矿井的更多弯腰和总开采等因素增加，自燃的可能性很可能会从当前水平增加。露天矿的剥采率，导致更多的破坏。同样可以肯定的是，煤矿开采将在不久的将来面临更严格的环境排放法规。为了确定自燃风险高的区域，有必要改进我们目前用于测试和评估煤样品的实验室程序，将结果与现场和现场数据相结合，并在必要时修改实验室评级系统以完善我们的了解南非的条件。目前，进行实验室测试以确定Wits-EHAC指数和交叉点温度，两者相结合可表明煤样品的自燃倾向。该程序使结果数据库得以建立，以审查和评估南非的煤层。使用该数据库，可以识别自燃方面的高风险区域。从2008年到2012年，已经连续五年进行了测试。通过一系列实验室测试，对来自不同煤层和生产煤田的119个煤样品进行了分析和分类。这些结果的综合数据库可用，并且随着添加新的测试结果而不断更新。该数据库将继续扩展，并为未经证实的自燃风险评估方法提供基础。

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