中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (12): 69-77.doi: 10.16265/j.cnki.issn 1003-3033.2021.12.010

• 安全工程技术 • 上一篇    下一篇

煤堆自燃特征的试验研究与数值模拟*

曲国娜1 讲师, 李红健1, 贾廷贵**1 副教授, 强倩1, 王来贵2 教授   

  1. 1 内蒙古科技大学 矿业与煤炭学院,内蒙古 包头 014010;
    2 辽宁工程技术大学 力学与工程学院,辽宁 阜新123000
  • 收稿日期:2021-09-25 修回日期:2021-11-17 出版日期:2021-12-28 发布日期:2022-06-28
  • 通讯作者: **贾廷贵(1979—),男,内蒙古化德人,博士,副教授,主要从事矿井火灾防治理论及技术工作。E-mail:jtg2000@126.com。
  • 作者简介:曲国娜 (1980—),女,辽宁本溪人,博士,讲师,硕士生导师,主要从事矿井火灾防治理论及技术研究。E-mail:quguona@126.com。
  • 基金资助:
    国家重点研究计划(2017YFC1503100);内蒙古自治区自然科学基金资助(2020MS05010);内蒙古自治区高等学校科学研究重点项目(NJZZ21025)。

Experimental and numerical simulation and study of spontaneous combustion characteristic of coal piles

QU Guona1, LI Hongjian1, JIA Tinggui1, QIANG Qian1, WANG Laigui2   

  1. 1 Institute of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
    2 College of Mechanics and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China
  • Received:2021-09-25 Revised:2021-11-17 Online:2021-12-28 Published:2022-06-28

摘要: 为探究梯形煤堆自燃特征,构建煤堆温度远程监测系统,利用煤堆迎风面深度方向上温度分布函数,基于多孔介质流体动力学与传热传质理论,建立煤堆自燃多场耦合数学模型,模拟不同孔隙率煤堆堆积条件下温度随风速的变化情况。结果表明:孔隙率一定的煤堆,处在低风速条件下,煤堆内部最高温度与煤堆深度为0.75 m的煤体温度随着风速的增加而逐渐增大;而处在高风速条件下,随风速的增加整体上呈降低趋势;在同等外界环境下,孔隙率越低的煤堆越不易自燃,但需考虑煤堆周围风流条件。

关键词: 煤堆自燃, 孔隙率, 数值模拟, 漏风速度, 升温速率

Abstract: In order to study spontaneous combustion characteristics of trapezoidal coal piles, and to build a remote monitoring system of coal pile temperature, based on theories of fluid dynamics and heat and mass transfer of porous media, a multi-field coupling mathematical model for spontaneous combustion of coal piles was established by using temperature distribution function on the windward side of the stockpile, and variation situations of temperature with wind speed under conditions of different porosity of coal piles were simulated. The results show that at a certain porosity, when wind speed is low, the maximum internal temperature of the pile and that of coal 0.75 m deep increase along with that of wind speed. But for the condition of a higher wind speed, their temperature gradually decrease with the increase of wind speed. Under the same external environment, the lower the porosity is, the harder it will be to cause spontaneous combustion, but considerations should be given to conditions around coal piles.

Key words: coal pile spontaneous combustion, porosity, numerical simulation, speed of air leakage, heating rate

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