• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
高地温对不同变质程度煤自燃微观结构影响试验研究
  • Title

    Experimental investigation on microstructure influence of high temperature on spontaneous combustion of coal with different ranks

  • 作者

    马冬娟唐一博

  • Author

    MA Dongjuan,TANG Yibo

  • 单位

    太原理工大学 矿业工程学院太原理工大学 安全与应急管理工程学院

  • Organization
    1.School of Mining Engineering,Taiyuan University of Technology,Taiyuan ,China;2.School of Safety and Emergency Management,Taiyuan University of Technology,Taiyuan ,China
  • 摘要

    深部煤炭开发为煤矿自燃火灾防治带来新的挑战,开采深度增加所导致的高地温环境直接改变了煤炭氧化自热的初始条件,也会逐渐影响煤的微观结构,加剧火灾风险。因此,为了研究深部煤炭开采面临的高地温环境对煤自燃特性的影响,选取代表矿区的8种不同变质程度煤样,通过模拟高地温环境处理煤样30 d,通过静态容量法测试煤样的孔隙结构变化,傅里叶红外光谱分析地温影响下煤主要活性基团变化,并对比程序升温试验180 ℃时的CO产率变化。研究结果表明:长期受高地温环境影响,煤中代表游离羟基的—OH伸缩振动和代表脂肪烃的C—H结构变化最为显著;煤样在长期处于高地温环境,无烟煤比表面积降低,最大降幅达到46.01%。烟煤的孔隙分布范围更多地集中在3 nm以上的区间内,处理前后变化最小。褐煤的孔隙较烟煤更为发育,处理后2种褐煤比表面积分别增加了4.04%和20.4%,平均孔径分别降低了20.5%和14.4%。地温对不同变质程度煤自燃特性的影响存在差异,高地温促使无烟煤、烟煤和褐煤CO生成量最高分别增加13.1%、28.5%和36.1%,说明低阶煤更易受高地温环境的影响。该研究为高地温环境影响下的煤矿采空区燃火灾防治提供参考。

  • Abstract
    Deep coal mining brings new challenges for prevention and control of spontaneous combustion in coal mines. For example, high geothermal environment caused by the increase of mining depth directly changes the initial conditions of coal oxidation and self-heating, then affects the micro-structure of coal, and increases the risk of fire. In order to study the influence of high geothermal environment on spontaneous combustion characteristics of coal in deep coal mining, eight coal samples with different coal rank were tested and compared. The coal samples were treated in simulated high ground temperature environment for 30 days and their pore structure changes were measured by static capacity method. The variation of main active groups of coal under the influence of ground temperature were analyzed by the Fourier infrared spectroscopy. The CO yield from the test was compared with the CO yield in the programmed temperature experiment at 180 ℃. The results show that the changes of —OH stretching (free hydroxyl group) and C—H structure (aliphatic hydrocarbons) in coal are the largest. The specific surface area of anthracite coal decreases to as low as 46.01% under the long term high geothermal environment. The pore of bituminous coal is mainly larger than 3 nm, with least structure change after treating. The pore size of lignite coal is more developed than that of bituminous coal. After treatment, the specific surface area of lignite and bituminous coal increases by 4.04% and 20.4% respectively, and the average pore size of lignite and bituminous coal decreases by 20.5% and 14.4% respectively. The influence of ground temperature on coal spontaneous combustion with different coal rank is significantly different. High ground temperature in-creases the CO production of anthracite, bituminous and lignite coal by 13.1%, 28.5% and 36.1%, respectively, which indicates that low-rank coal is more susceptible to high ground temperature environment. This research provides a reference for the prevention and control of fire hazards in underground mine gob in high geothermal environment.
  • 关键词

    地温煤自燃微观结构不同煤阶

  • KeyWords

    ground temperature; spontaneous combustion of coal; microstructure; different coal rank

  • 基金项目(Foundation)
    国家自然科学基金资助项目(51604185)
  • 相关文章
  • 图表
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    • 无烟煤处理前后红外光谱

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