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<p>China is rich in coal resources, and accurately monitoring abnormal coal temperature is of great significance for early warning and precise prevention and control of coal spontaneous combustion (CSC). Acoustic temperature measurement technology shows promising prospects in precise monitoring of concealed fire sources, but there is limited content on acoustic wave dynamic characteristics. Therefore, this paper theoretically analyzes the propagation characteristics of acoustic waves in loose coal and constructs a dedicated acoustic testing system for CSC. Experiments were conducted on three coal samples with different metamorphic degrees to reveal the evolution laws of acoustic parameters. The results show that acoustic velocity has a significant linear positive correlation with temperature (R<sup>2</sup> &gt; 0.94, <i>p</i> &lt; 0.001), and the attenuation coefficient α also increases continuously (R<sup>2</sup> &gt; 0.89). The sub-dominant frequency amplitude increases faster and is more sensitive to the primary oxidation stage. Microscopic testing is used to analyze the changes in pore structure during CSC. During the temperature rise of coal, the specific surface area and total pore volume of the coal sample continuously increase, and the transmission channels of acoustic signals increase, leading to a continuous increase in the main frequency amplitude. The research in this paper lays the foundation for the inversion of coal temperature based on the acoustic dynamic characteristic parameters during CSC.</p>

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Study on acoustic dynamic characteristics and temperature identification during coal spontaneous combustion

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Xiangming Hu,
  • Hao Dong,
  • Haibo Hong,
  • Jianhui Zhong,
  • Biao Kong,
  • Guangchuan Li,
  • Liang Qiao,
  • Qiaoqiao Liang,
  • Shenghe Chen,
  • Yufei Liu

摘要

China is rich in coal resources, and accurately monitoring abnormal coal temperature is of great significance for early warning and precise prevention and control of coal spontaneous combustion (CSC). Acoustic temperature measurement technology shows promising prospects in precise monitoring of concealed fire sources, but there is limited content on acoustic wave dynamic characteristics. Therefore, this paper theoretically analyzes the propagation characteristics of acoustic waves in loose coal and constructs a dedicated acoustic testing system for CSC. Experiments were conducted on three coal samples with different metamorphic degrees to reveal the evolution laws of acoustic parameters. The results show that acoustic velocity has a significant linear positive correlation with temperature (R2 > 0.94, p < 0.001), and the attenuation coefficient α also increases continuously (R2 > 0.89). The sub-dominant frequency amplitude increases faster and is more sensitive to the primary oxidation stage. Microscopic testing is used to analyze the changes in pore structure during CSC. During the temperature rise of coal, the specific surface area and total pore volume of the coal sample continuously increase, and the transmission channels of acoustic signals increase, leading to a continuous increase in the main frequency amplitude. The research in this paper lays the foundation for the inversion of coal temperature based on the acoustic dynamic characteristic parameters during CSC.