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<p>Gas explosions are a major hazard in coal mines, resulting in casualties and economic losses. To investigate the coupled effects of suppressor concentration and particle size on methane explosions, medium-scale explosion tube experiments were conducted using calcium carbonate powders with different particle sizes and concentrations. The effects on flame propagation velocity, explosion pressure, and pressure rise rate were systematically examined. Particle size analysis, scanning electron microscopy, and thermogravimetric analysis were employed to characterize the particle size distribution, microstructure, and thermochemical behavior of the powders. The results demonstrate that calcium carbonate powder exhibits a pronounced suppression effect on methane explosions. The suppression performance does not increase monotonically with decreasing particle size or increasing concentration, but instead shows a clear particle size–concentration coupling effect. Optimal suppression was achieved at a particle size of 23 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\upmu \)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">μ</mi> </math></EquationSource> </InlineEquation>m and a concentration of 125 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\text {g/m}^3\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mtext>g/m</mtext> <mn>3</mn> </msup> </math></EquationSource> </InlineEquation>, with a maximum suppression efficiency of 60.7%. The suppression mechanism is attributed to the combined effects of endothermic thermal decomposition, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\text {CO}_2\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>CO</mtext> <mn>2</mn> </msub> </math></EquationSource> </InlineEquation>-induced inerting, and physical interference with flame propagation. This study provides experimental evidence and theoretical guidance for the optimized design of calcium carbonate-based explosion suppressants and enhanced mine safety protection.</p>

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Experimental study on methane explosion suppression by calcium carbonate powder

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • S. Ji,
  • Z. Xu,
  • G. Li,
  • Y. Hu,
  • J. Xu,
  • T. Mai

摘要

Gas explosions are a major hazard in coal mines, resulting in casualties and economic losses. To investigate the coupled effects of suppressor concentration and particle size on methane explosions, medium-scale explosion tube experiments were conducted using calcium carbonate powders with different particle sizes and concentrations. The effects on flame propagation velocity, explosion pressure, and pressure rise rate were systematically examined. Particle size analysis, scanning electron microscopy, and thermogravimetric analysis were employed to characterize the particle size distribution, microstructure, and thermochemical behavior of the powders. The results demonstrate that calcium carbonate powder exhibits a pronounced suppression effect on methane explosions. The suppression performance does not increase monotonically with decreasing particle size or increasing concentration, but instead shows a clear particle size–concentration coupling effect. Optimal suppression was achieved at a particle size of 23 \(\upmu \) μ m and a concentration of 125 \(\text {g/m}^3\) g/m 3 , with a maximum suppression efficiency of 60.7%. The suppression mechanism is attributed to the combined effects of endothermic thermal decomposition, \(\text {CO}_2\) CO 2 -induced inerting, and physical interference with flame propagation. This study provides experimental evidence and theoretical guidance for the optimized design of calcium carbonate-based explosion suppressants and enhanced mine safety protection.