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Delineation and Prevention of the Spontaneous Combustion Dangerous Area of Coal in a Regenerated Roof: A Case Study in the Zhoujing Coal Mine, China

机译：在再生屋顶煤炭自燃危险面积的描绘与预防 - 以周泾煤矿煤矿案例研究

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摘要

Spontaneous coal combustion in a regenerated roof is difficult to find, and the awareness of prevention is relatively weak. To effectively delineate the range of the danger area, the characteristic parameters of spontaneous coal combustion were tested. The result shows that carbon monoxide (CO) was chosen as the index gas, and the relationship between the oxygen consumption rate and oxygen concentration was fitted linearly. Mathematical models of the air speed field and oxygen concentration field were derived, and a physical model of the regenerated roof was established. On the basis of COMSOL Multiphysics simulation, the test value and predicted value of air speed and oxygen concentration were compared with good similarity. The danger area of spontaneous coal combustion was determined by the two indices of oxygen concentration and air speed with ranges of 1.35-6 and 0.60-3.02 m, respectively. A polyacrylamide-particle-stabilized foam (PPSF) with an average pore size of 165 mu m and pore wall thickness of 30.5 mu m was prepared in batch mode using a homemade foam-generating device. Optical microstructure characterization showed that the mixed powder can be distributed evenly in the liquid film and that polyacrylamide as a vesicular liquid membrane carrier presented a network structure. The formation mechanism of the foam was presented in a schematic diagram. The PPSF was injected into the delineated danger area of 350 m(3), and the temperature and concentration of CO decreased to 32 and 29 degrees C and 5 and 22 ppm, respectively. All of these results indicated that PPSF can effectively inhibit spontaneous coal combustion in the regenerated roof.
机译：再生屋顶中的自发煤燃烧很难找到，预防的认识相对较弱。为了有效描绘危险区域的范围，测试了自发煤燃烧的特征参数。结果表明，选择一氧化碳（CO）作为指数气体，氧消耗率与氧浓度之间的关系线性地拟合。推导出空气速度场和氧浓度场的数学模型，建立了再生屋顶的物理模型。基于COMSOL多体体仿真，将试验值和预测的空气速度和氧气浓度的值与良好相似。自发煤燃烧的危险区域是由两种氧浓度和空气速度的指数测定，分别为1.35-6和0.60-3.02 m。使用自制泡沫产生装置，在分批模式下制备平均孔径为165μm和孔壁厚度为30.5μm的聚丙烯酰胺颗粒稳定的泡沫（PPSF）。光学微观结构表征显示，混合粉末可以均匀地分布在液体膜中，并将聚丙烯酰胺作为囊状液体膜载体呈现网络结构。泡沫的形成机制在示意图中提出。将PPSF注入350 m（3）的划清危险区域，CO的温度和浓度分别降低至32和29℃和5和22ppm。所有这些结果表明，PPSF可以有效地抑制再生屋顶的自发煤燃烧。

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  • 来源
    《Energy & fuels》 |2020年第5期|6401-6413|共13页
  • 作者

    Lu Yi; Yan Zhihong; Shi Shiliang; Wang Geoff; Li He; Niu Huiyong; Guo Zhiguo; Wang Ping;

  • 作者单位

    Hunan Univ Sci & Technol Sch Resource Environm & Safety Engn Xiangtan 411201 Hunan Peoples R China|Hunan Univ Sci & Technol Work Safety Key Lab Prevent & Control Gas & Roof Xiangtan 411201 Hunan Peoples R China|Univ Queensland Sch Chem Engn Brisbane Qld 4072 Australia;

    Hunan Univ Sci & Technol Sch Resource Environm & Safety Engn Xiangtan 411201 Hunan Peoples R China;

    Hunan Univ Sci & Technol Sch Resource Environm & Safety Engn Xiangtan 411201 Hunan Peoples R China;

    Univ Queensland Sch Chem Engn Brisbane Qld 4072 Australia;

    Hunan Univ Sci & Technol Sch Resource Environm & Safety Engn Xiangtan 411201 Hunan Peoples R China;

    Hunan Univ Sci & Technol Sch Resource Environm & Safety Engn Xiangtan 411201 Hunan Peoples R China;

    Jiangxi Univ Sci & Technol Sch Resources & Environm Engn Ganzhou 341000 Jiangxi Peoples R China;

    Hunan Univ Sci & Technol Sch Resource Environm & Safety Engn Xiangtan 411201 Hunan Peoples R China|Hunan Univ Sci & Technol Work Safety Key Lab Prevent & Control Gas & Roof Xiangtan 411201 Hunan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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