Scholarlink

<p>To reveal the influence of the acidic environment on the combustion characteristics and microscopic functional groups of coal, the variation of characteristic temperatures, heat release, combustion characteristic parameters, apparent activation energy, and functional group of coal under different acidification concentrations (0%, 30%, 60%, 90%) were studied by thermogravimetry–differential scanning calorimetry (TG–DSC) and Fourier-transform infrared (FT-IR) spectroscopy experiments. The correlations between characteristic temperatures and functional groups were analyzed, and a multivariate linear regression model for coal spontaneous combustion tendency was established. The results indicate that the characteristic temperatures of coal exhibit a trend of first increasing and then decreasing after acidification treatment, reaching the maximum value at an acetic acid concentration of 60%, while the exothermic peak areas and combustion characteristic parameters exhibit an opposite variation trend. The relative content order of functional groups in coal remains consistent before and after acidification, with oxygen-containing functional groups &gt; aliphatic hydrocarbon structures &gt; aromatic hydrocarbon structures. Compared with unacidified coal, the content of oxygen-containing functional group in acidified coal increases by 4.82–6.83%, that of aliphatic hydrocarbon structure decreases by 8.30–12.59%, and the content of aromatic hydrocarbon structure reaches the maximum at an acidification concentration of 90%. The correlation analyses indicate that the functional groups with the strongest positive correlations corresponding to the characteristic temperatures <i>T</i><sub>1</sub>–<i>T</i><sub>5</sub> are –COOH, Ar–CH, Ar–CH, Ar–CH, and –OH, respectively, while the functional groups with the strongest negative correlations corresponding to <i>T</i><sub>1</sub>–<i>T</i><sub>5</sub> are Ar–C–O–, C=C, C=C, Ar–C–O–, and C–O–C, respectively. The dominant functional groups vary in different coal combustion stages. Among them, Ar–CH (<i>r</i> = 0.92) and Ar–C–O– (<i>r</i> = − 0.90) have strong correlations with characteristic temperatures. On this basis, a multiple linear regression model for coal spontaneous combustion tendency was established. The findings can provide a theoretical basis for the prevention of coal spontaneous combustion in acid mining areas.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects and Correlations of Acetic Acid Concentration on the Combustion Characteristics and Functional Groups of Coal

  • 期刊论文

  • 发表日期：

    2026年5月8日

查看全文
  • Junhong Si,
  • Ziming Fan,
  • Lin Li,
  • Yiqiao Wang,
  • Zihao Zhao

摘要

To reveal the influence of the acidic environment on the combustion characteristics and microscopic functional groups of coal, the variation of characteristic temperatures, heat release, combustion characteristic parameters, apparent activation energy, and functional group of coal under different acidification concentrations (0%, 30%, 60%, 90%) were studied by thermogravimetry–differential scanning calorimetry (TG–DSC) and Fourier-transform infrared (FT-IR) spectroscopy experiments. The correlations between characteristic temperatures and functional groups were analyzed, and a multivariate linear regression model for coal spontaneous combustion tendency was established. The results indicate that the characteristic temperatures of coal exhibit a trend of first increasing and then decreasing after acidification treatment, reaching the maximum value at an acetic acid concentration of 60%, while the exothermic peak areas and combustion characteristic parameters exhibit an opposite variation trend. The relative content order of functional groups in coal remains consistent before and after acidification, with oxygen-containing functional groups > aliphatic hydrocarbon structures > aromatic hydrocarbon structures. Compared with unacidified coal, the content of oxygen-containing functional group in acidified coal increases by 4.82–6.83%, that of aliphatic hydrocarbon structure decreases by 8.30–12.59%, and the content of aromatic hydrocarbon structure reaches the maximum at an acidification concentration of 90%. The correlation analyses indicate that the functional groups with the strongest positive correlations corresponding to the characteristic temperatures T1–T5 are –COOH, Ar–CH, Ar–CH, Ar–CH, and –OH, respectively, while the functional groups with the strongest negative correlations corresponding to T1–T5 are Ar–C–O–, C=C, C=C, Ar–C–O–, and C–O–C, respectively. The dominant functional groups vary in different coal combustion stages. Among them, Ar–CH (r = 0.92) and Ar–C–O– (r = − 0.90) have strong correlations with characteristic temperatures. On this basis, a multiple linear regression model for coal spontaneous combustion tendency was established. The findings can provide a theoretical basis for the prevention of coal spontaneous combustion in acid mining areas.