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Effects of igneous intrusions on the structure and spontaneous combustion propensity of coal: A case study of bituminous coal in Daxing Mine, China

机译：火成岩侵入对煤结构和自燃倾向的影响-以大兴煤矿烟煤为例

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摘要

An investigation of the effects of igneous intrusions on the physicochemical structure and spontaneous combustion characteristics of coal is important for safe production in coal mines. In this study, unaltered coal and thermally-altered coal affected by igneous intrusions were collected from Daxing Mine. The mineral and ash composition, surface functional groups, surface morphology and pore structure were characterized by XRD, XPS, SEM, N-2 adsorption and mercury intrusion porosimetry. The spontaneous combustion propensity of coal samples was investigated using oxidation kinetics experiment. Mineral and ash composition analysis revealed that igneous intrusions increased the relative contents of calcite and CaO in the thermally-altered coal. The results of XPS tests indicated that the content of C-C/C-H slightly increased and an obvious pi - pi* shake-up satellite peak appeared in the thermally-altered coal, but that the contents of C-O-, C=O, and COO- showed a decreasing trend. Compared with the pore structure of the unaltered coal, higher porosity, larger pore volume, and larger average pore diameter were found in the thermally-altered coal. Moreover, more pores with diameter 20 nm were formed due to igneous intrusions, which would improve the transport capacity of O-2 in pores to react with active sites on pore surfaces in the thermally-altered coal. Moreover, igneous intrusions increased the O-2 consumption rate of the thermally-altered coal, and decreased its crossing point temperature and spontaneous combustion propensity evaluating index I. This study concluded that igneous intrusions improved the spontaneous combustion risk of Daxing bituminous coal.
机译：研究火成岩侵入对煤的理化结构和自燃特性的影响对煤矿安全生产具有重要意义。在这项研究中，从大兴煤矿收集了未变质煤和受火成岩侵入影响的热变质煤。利用XRD，XPS，SEM，N-2吸附和压汞法对矿物和灰分的组成，表面官能团，表面形态和孔结构进行了表征。利用氧化动力学实验研究了煤样品的自燃倾向。矿物和灰分成分分析表明，火成岩侵入增加了热蚀煤中方解石和CaO的相对含量。 XPS测试的结果表明，热改变后的煤中CC / CH的含量略有增加，并且出现了明显的pi-pi *摇动卫星峰，但CO-，C = O和COO-的含量呈下降趋势。与未改变的煤的孔结构相比，热改变的煤具有更高的孔隙率，更大的孔体积和更大的平均孔径。此外，由于火成岩侵入，形成了更多直径> 20 nm的孔隙，这将提高O-2在孔隙中的传输能力，使其与热蚀煤中孔隙表面的活性部位发生反应。此外，火成岩侵入增加了热变质煤的O-2消耗率，降低了交叉点温度和自燃倾向评价指标I。本研究得出结论，火成岩侵入改善了大兴烟煤的自燃危险性。

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  • 来源
    《Fuel》 |2018年第15期|181-189|共9页
  • 作者

    Shi Quanlin; Qin Botao; Liang Hongjun; Gao Yuan; Bi Qiang; Qu Bao;

  • 作者单位

    China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Peoples R China;

    China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Peoples R China;

    China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Peoples R China;

    China Univ Min & Technol, Minist Educ, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221116, Peoples R China;

    Tiefa Coal Ltd, Daxing Mine, Tieling 112000, Liaoning, Peoples R China;

    Tiefa Coal Ltd, Daxing Mine, Tieling 112000, Liaoning, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Igneous intrusions; Bituminous coal; Physicochemical structure; Spontaneous combustion of coal;

    机译：火成岩侵入性煤物化结构煤自燃;

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