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<p>Coal spontaneous combustion seriously threatens the safety production of mines, and oxygen plays a significant role in regulating the occurrence and development of coal spontaneous combustion. In order to explore the law of changes in the microscopic and oxidation characteristics of coal induced by coal-oxygen interaction, the oxygen absorption characteristics of lignite and anthracite at different temperatures were tested by gas adsorption experiment, and the changes in the microscopic groups and oxidation properties of the coals before and after oxygen adsorption were investigated by using electron spin resonance, Fourier transform infrared spectroscopy, and differential scanning calorimetry experiments. The experimental results show that the adsorption capacities of oxygen and nitrogen on the coal surface increase linearly with the increase of adsorption equilibrium pressure, and the temperature has a more obvious effect on the adsorption characteristics at 1&#xa0;Mpa. At lower adsorption temperatures, the physical oxygen absorption capacity of high-metamorphic anthracite is high, and at higher adsorption temperatures, the oxygen absorption capacity of low-metamorphic lignite is significantly increased. At 30&#xa0;°C, the maximum oxygen absorption capacities of lignite and anthracite are 3.6123&#xa0;cm<sup>3</sup>g<sup>−1</sup> and 9.0770&#xa0;cm<sup>3</sup>g<sup>−1</sup>, respectively. At 130&#xa0;°C, the maximum oxygen absorption capacities of lignite and anthracite are 15.9690&#xa0;cm<sup>3</sup>g<sup>−1</sup> and 5.7915&#xa0;cm<sup>3</sup>g<sup>−1</sup>, respectively. Coal-oxygen interaction increases the types of oxygen-containing free radicals in coal, accelerates the consumption rate of free radicals, and promotes the free radical chain reaction. After oxygen adsorption, the evolution trend of functional groups in coal is affected by water evaporation, oxidation reaction, coal-oxygen intrinsic reaction, and pyrolysis reaction. The coal-oxygen interaction accelerates the consumption of aliphatic hydrocarbons and oxygen-containing functional groups and improves the oxidation and heat release capacity of coal.</p> Graphical abstract <p></p>

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Study on changes of microscopic and oxidation characteristics of coal induced by coal-oxygen interaction

  • 期刊论文

  • 发表日期：

    2025年8月24日

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  • Ke Xi,
  • Shengqiang Yang,
  • Lin Lan,
  • Wanxin Song,
  • Xiaoyuan Jiang,
  • Zongqing Tang

摘要

Coal spontaneous combustion seriously threatens the safety production of mines, and oxygen plays a significant role in regulating the occurrence and development of coal spontaneous combustion. In order to explore the law of changes in the microscopic and oxidation characteristics of coal induced by coal-oxygen interaction, the oxygen absorption characteristics of lignite and anthracite at different temperatures were tested by gas adsorption experiment, and the changes in the microscopic groups and oxidation properties of the coals before and after oxygen adsorption were investigated by using electron spin resonance, Fourier transform infrared spectroscopy, and differential scanning calorimetry experiments. The experimental results show that the adsorption capacities of oxygen and nitrogen on the coal surface increase linearly with the increase of adsorption equilibrium pressure, and the temperature has a more obvious effect on the adsorption characteristics at 1 Mpa. At lower adsorption temperatures, the physical oxygen absorption capacity of high-metamorphic anthracite is high, and at higher adsorption temperatures, the oxygen absorption capacity of low-metamorphic lignite is significantly increased. At 30 °C, the maximum oxygen absorption capacities of lignite and anthracite are 3.6123 cm3g−1 and 9.0770 cm3g−1, respectively. At 130 °C, the maximum oxygen absorption capacities of lignite and anthracite are 15.9690 cm3g−1 and 5.7915 cm3g−1, respectively. Coal-oxygen interaction increases the types of oxygen-containing free radicals in coal, accelerates the consumption rate of free radicals, and promotes the free radical chain reaction. After oxygen adsorption, the evolution trend of functional groups in coal is affected by water evaporation, oxidation reaction, coal-oxygen intrinsic reaction, and pyrolysis reaction. The coal-oxygen interaction accelerates the consumption of aliphatic hydrocarbons and oxygen-containing functional groups and improves the oxidation and heat release capacity of coal.

Graphical abstract