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Effects of Igneous Intrusion on Microporosity and Gas Adsorption Capacity of Coals in the Haizi Mine China

机译：火成岩侵入对海子煤矿煤微孔性和瓦斯吸附能力的影响

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摘要

This paper describes the effects of igneous intrusions on pore structure and adsorption capacity of the Permian coals in the Huaibei Coalfield, China. Twelve coal samples were obtained at different distances from a ~120 m extremely thick sill. Comparisons were made between unaltered and heat-affected coals using geochemical data, pore-fracture characteristics, and adsorption properties. Thermal alteration occurs down to ~1.3 × sill thickness. Approaching the sill, the vitrinite reflectance (R o) increased from 2.30% to 2.78%, forming devolatilization vacuoles and a fine mosaic texture. Volatile matter (VM) decreased from 17.6% to 10.0% and the moisture decreased from 3.0% to 1.6%. With decreasing distance to the sill, the micropore volumes initially increased from 0.0054 cm3/g to a maximum of 0.0146 cm3/g and then decreased to 0.0079 cm3/g. The results show that the thermal evolution of the sill obviously changed the coal geochemistry and increased the micropore volume and adsorption capacity of heat-affected coal (60–160 m from the sill) compared with the unaltered coals. The trap effect of the sill prevented the high-pressure gas from being released, forming gas pocket. Mining activities near the sill created a low pressure zone leading to the rapid accumulation of methane and gas outbursts in the Haizi Mine.
机译：本文介绍了火成岩侵入对淮北煤田二叠系煤孔结构和吸附能力的影响。从〜120 m极厚的门槛处以不同的距离获得了十二个煤样品。利用地球化学数据，孔隙破裂特征和吸附特性对未改变和受热影响的煤进行了比较。热变化低至〜1.3×门槛厚度。接近窗台时，镜质体反射率（R o）从2.30％增加到2.78％，形成脱挥发液泡和精细的镶嵌纹理。挥发性物质（VM）从17.6％降至10.0％，水分从3.0％降至1.6％。随着到窗台距离的减小，微孔体积最初从0.0054 cm 3 / g增加到最大0.0146 cm 3 / g，然后减小到0.0079 cm / g 3 / g。结果表明，与未改变的煤相比，基台的热演化明显改变了煤的地球化学，并增加了受热影响的煤（距离基台60-160μm）的微孔体积和吸附能力。窗台的捕集效果阻止了高压气体的释放，从而形成了气穴。窗台附近的采矿活动形成了一个低压带，导致海子矿井中甲烷和瓦斯突出物迅速堆积。

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    Jingyu Jiang; Yuanping Cheng;

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  • 年(卷),期 -1(2014),-1
  • 年度 -1
  • 页码 976582
  • 总页数 12
  • 原文格式 PDF
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  • 入库时间 2022-08-21 11:19:34

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