Mine fires and spontaneous combustion are prime issues in the coal mining industry and have led to huge coal losses and mine disasters. The property of self-oxidation of coal makes it highly vulnerable to degradation after being exposed to favorable conditions of spontaneous heating. For safe storage and use of coal, it is very important to know about its liability to spontaneous heating. It is known that, spontaneous heating is dependent upon intrinsic and extrinsic parameters. In the present work, the spontaneous combustion susceptibility of a number of coal samples belonging to different coalfields have been studies and its correlation with different intrinsic properties have been carried out. In order to carry out the above study, 23 coal samples were collected from different Indian coalfields.Coal samples were collected from Singareni Collieries Company Ltd. (SCCL), Northern Coalfields Ltd.(NCL), Mahanadi Coalfields Ltd. (MCL), South Eastern Coal Fields Ltd. (SECL) and Eastern Coal Fields Ltd. (ECL).. The experiments carried out to determine the intrinsic properties and susceptibility indices wereProximate analysis, Bomb calorimetry, Crossing point temperature, Differential thermal analysis and Wet oxidation potential.From correlation analysis, it was found that average slopes of stage IIA and IIB obtained from DTA thermograms indicated a fairly accurate measure of spontaneous heating susceptibility as they showed high correlation with the intrinsic properties. Moisture and volatile matter content may also be helpful in assessment of liability of coal to spontaneous heating as they showed better correlation than other intrinsic properties viz., ash content and gross calorific values. Differential thermal analysis was found to give better correlation and so may be accepted as a better method for assessment of spontaneous heating susceptibility of coal than crossing point temperature and wet oxidation potential analysis. It is expected that the finding of this work will help the field engineers to accurately assess the spontaneous heating susceptibility of coal seams in their mines and plan the production activities accordingly.
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机译：矿井火灾和自燃是煤矿行业的主要问题，并导致巨大的煤炭损失和矿难。煤的自氧化特性使其在遭受自发加热的良好条件后极易降解。为了安全地存储和使用煤炭，了解煤炭对自燃的责任非常重要。已知自发加热取决于内在和外在参数。在目前的工作中，已经研究了属于不同煤田的许多煤样品的自燃敏感性，并且已经进行了与不同内在性质的相关性。为了进行上述研究，从印度不同煤田收集了23个煤样品，分别从Singareni Collieries Company Ltd.（SCCL），Northern Coalfields Ltd.（NCL），Mahanadi Coalfields Ltd.（MCL），South东部煤田有限公司（SECL）和东部煤田有限公司（ECL）..确定内在性质和磁化系数的实验包括近似分析，炸弹量热法，穿越点温度，差热分析和湿氧化势。相关分析发现，从DTA热分析图获得的IIA和IIB阶段的平均斜率表明自发热敏感性的相当准确的度量，因为它们与内在特性高度相关。水分和挥发物含量也可能有助于评估煤炭对自燃的责任，因为它们显示出比其他内在特性更好的相关性，即灰分含量和总热值。发现差热分析具有更好的相关性，因此，与交叉点温度和湿式氧化势分析相比，差热分析可以更好地评估煤的自发热敏感性。预期这项工作的发现将有助于现场工程师准确评估其矿井中煤层的自发热敏感性，并据此计划生产活动。
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