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<p>Gas extraction is a crucial measure to solve the coal mine gas disaster, but the broken coal body near the extraction borehole is easily oxidized naturally in the process of gas extraction, resulting in the continuous development of the internal pores of the fractured coal body, which further exacerbates the intensity of air leakage and the degree of ignition. To improve the gasification efficiency of coal seams and predict the dangerous area of gas spillage, this paper profoundly investigates the evolution law of different pore sizes, functional pores, and fracture development laws of the coal body around the reaction area during the spontaneous combustion of coal. The investigation uses the coal spontaneous combustion (CSC) simulation experimental system and nuclear magnetic resonance porosimetry technology. Additionally, it reveals the inner mechanism of pore evolution using the CSC simulation experimental system coupled with gas chromatography. The study shows that the internal pores of coal bodies with a low degree of metamorphism are more developed, and these pores develop faster during the CSC process. The development of micropores and mesopores is dominant in the low-temperature stage (30 ~ 110&#xa0;℃) of coal body combustion, while mesopores and macropores dominate in the high-temperature stage (&gt; 110&#xa0;°C). The adsorption capacity and seepage capacity of the coal body to the generated gas are enhanced as the combustion process advances. However, the enhancement of seepage capacity lags behind the adsorption capacity, which may lead to difficulties in gas extraction during the initial oxidation stage. In the initial stage of the coal combustion process, pore development mainly relies on decomposing water-containing compounds. However, with the increase in oxidation temperature, the oxidation of organic matter inside the coal gradually becomes the main factor for pore development.</p>

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Development law and internal mechanism of pores in coal spontaneous combustion

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Zongqing Tang,
  • Huana Zhang,
  • Ping Chang,
  • Saeed Zeinali Heris,
  • Shengqiang Yang,
  • Guang Xu,
  • Jun Deng,
  • Buzhuang Zhou

摘要

Gas extraction is a crucial measure to solve the coal mine gas disaster, but the broken coal body near the extraction borehole is easily oxidized naturally in the process of gas extraction, resulting in the continuous development of the internal pores of the fractured coal body, which further exacerbates the intensity of air leakage and the degree of ignition. To improve the gasification efficiency of coal seams and predict the dangerous area of gas spillage, this paper profoundly investigates the evolution law of different pore sizes, functional pores, and fracture development laws of the coal body around the reaction area during the spontaneous combustion of coal. The investigation uses the coal spontaneous combustion (CSC) simulation experimental system and nuclear magnetic resonance porosimetry technology. Additionally, it reveals the inner mechanism of pore evolution using the CSC simulation experimental system coupled with gas chromatography. The study shows that the internal pores of coal bodies with a low degree of metamorphism are more developed, and these pores develop faster during the CSC process. The development of micropores and mesopores is dominant in the low-temperature stage (30 ~ 110 ℃) of coal body combustion, while mesopores and macropores dominate in the high-temperature stage (> 110 °C). The adsorption capacity and seepage capacity of the coal body to the generated gas are enhanced as the combustion process advances. However, the enhancement of seepage capacity lags behind the adsorption capacity, which may lead to difficulties in gas extraction during the initial oxidation stage. In the initial stage of the coal combustion process, pore development mainly relies on decomposing water-containing compounds. However, with the increase in oxidation temperature, the oxidation of organic matter inside the coal gradually becomes the main factor for pore development.