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Prediction and prevention of spontaneous combustion of coal from goafs in workface: A case study
Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2020-05-29 , DOI: 10.1016/j.csite.2020.100668
Dingyi Wei , Cuifeng Du , Ba Lei , Yifan Lin

Aiming at forecasting and preventing remnant coal spontaneous combustion in goaf, this thesis conducts determination on the spontaneous combustion tendency of coal seam, simultaneous thermogravimetry and differential scanning calorimetry(TG-DSC) analysis on coal samples, optimization on index gas of spontaneous combustion, and division of spontaneous combustion “three zones” with O2 concentration as the indicator. The conclusions are as follows: the spontaneous combustion period of remnant coal is 1–3 months, so the coal seam is easy to spontaneous combustion. CO and C2H4 are selected as the index gas for forecasting spontaneous combustion in No.12 coal seam and No.12-up coal seam because of their regular evolution tendency in concentration changing with coal temperature and easiness in detecting. As to the spontaneous combustion “three zones” divided by O2 concentration, the depth and width of both heat dissipation zone and left side oxidation zone in the goaf is slightly increased when the “Y” type ventilation is adopted, comparing with the “U” type ventilation, and the asphyxiation zone is extended to about 200 m behind the workface. Pressure balance method and ground fissure sealing are proposed for spontaneous combustion prevention and extinction, which offers some practical experiences for adjacent mine or similar coal seam.



中文翻译:

工作面采空区煤自燃的预测与预防:案例研究

为了预测和防止采空区煤的自燃残余,本论文对煤层的自燃趋势进行了确定,同时对煤样进行了热重分析和差示扫描量热法(TG-DSC)分析,对自燃指标气体进行了优化。以O 2浓度为指标的自然燃烧“三个区域”的划分。结论如下:残煤的自燃时间为1-3个月,因此煤层易于自燃。CO和C 2 H 4选择12号煤层和12号以上煤层的自燃指数气体,是因为它们的浓度随煤温变化规律变化并且易于检测。对于自燃“三区”除以O 2浓度,采用“ Y”型通风时,采空区的散热区和左侧氧化区的深度和宽度都比“ U”型略有增加。式通风,窒息区延伸至工作面后约200 m。提出了压力平衡法和地裂缝封闭法,以防止自燃和熄灭,为邻近矿井或类似煤层提供了一些实践经验。

更新日期:2020-05-29
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