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煤火竖直正向阴燃特性研究

亓冠圣, 杨雪花, 张小翌, 马李洋

亓冠圣, 杨雪花, 张小翌, 马李洋. 煤火竖直正向阴燃特性研究[J]. 煤矿安全, 2018, 49(11): 54-58.
引用本文: 亓冠圣, 杨雪花, 张小翌, 马李洋. 煤火竖直正向阴燃特性研究[J]. 煤矿安全, 2018, 49(11): 54-58.
QI Guansheng, YANG Xuehua, ZHANG Xiaoyi, MA Liyang. Study on Vertical Forward Smoldering Characteristics of Coal Fire[J]. Safety in Coal Mines, 2018, 49(11): 54-58.
Citation: QI Guansheng, YANG Xuehua, ZHANG Xiaoyi, MA Liyang. Study on Vertical Forward Smoldering Characteristics of Coal Fire[J]. Safety in Coal Mines, 2018, 49(11): 54-58.

煤火竖直正向阴燃特性研究

Study on Vertical Forward Smoldering Characteristics of Coal Fire

  • 摘要: 地下煤火的持续缓慢燃烧是煤体阴燃传播作用的结果。为探究煤火竖直正向阴燃传播特性,采用自行设计并搭建的煤火阴燃模拟相似实验平台,在不同供风速率下开展了长焰煤竖直正向阴燃模拟实验,分析了供风速率对煤体内阴燃传播方向上4个测点的温度实时变化规律、最高反应温度、总阴燃时长及燃烧速率等参数的影响。研究结果表明,在竖直正向阴燃过程中,煤体在80~85 ℃范围内进入温度恒定的水分蒸发阶段,随后温度快速上升,依次进入脱挥发分和半焦/焦炭燃烧阶段。在2、0.8 m3/h供风量条件下,阴燃过程中顶部煤体向底部垮落,而在0.4、0.2 m3/h及以下供风量,未形成明显垮落。煤体总阴燃时长与风流速率之间呈指数关系,燃烧速率则随风流速率的增加而线性增长。
    Abstract: The continuous slow burning of underground coal fire is the result of coal smoldering propagation effects. A self-designed similar experimental platform was designed and built in order to explore the propagation characteristics of vertical forward smoldering of coal fire, and the simulation experiment of vertical forward smoldering of long-flame coal was carried out under different air supply rates, and the effects of the air supply rate on the real-time change of temperature, the maximum reaction temperature, the total length of smoldering and the combustion rate of four measuring points in the smoldering propagation direction of coal were analyzed. The results show that, in the vertical forward smoldering process, the coal goes into the evaporation stage of constant temperature at 80 ℃~85 ℃ range, the temperature rising fast, then in turn into the volatile and carbocoal/coke burning off stage. Under the condition of 2, 0.8 m3/h supply air volume, the top coal body caved to the bottom during the smoldering process, while the supply air volume under 0.4, 0.2 m3/h and below did not form obvious collapse. There is an exponential relationship between the length of total smoldering and the airflow rate of coal, and the combustion rate increases linearly with the increase of airflow rate.
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  • 发布日期:  2018-11-19

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