惰性气体喷射参数对H2-CH4混合气体爆炸抑制效果的影响
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中图分类号：TD712.71 文献标志码：A
Abstract：To investigate the effect of inert gas injection parameters on the explosion characteristics of H2 CH4 mixtures，experiments were carred out in a horizontal pipeline to study the suppression of H2-CH4 mixture explosions by N2 and CO2 .The effects of N2 and CO2 injection positions and injection angles on explosion pressure，flame propagation speed，and flame front temperature of H2-CH4 mixtures were examined. The results showed that N2 and CO2 significantly reduced explosion pressure，flame propagation speed，and flame front temperature，and that the suppression effect of CO2 on H2-CH4 mixture explosions was stronger than that of N2 业 The suppression ability of inert gas Was better when injected at the near-flame end than at the far-flame end. As the injection angle of inert gas increased，the maximum explosion pressure，flame propagation speed，and flame front temperature gradually decreased， and the suppression effect on H2-CH4 mixtures gradually increased. Chemkin-Pro simulations indicated that， with the addition of CO2 ， the peak molar fractions of H radicals and OH radicals decreased by 14.2% and 9.9% ，respectively， compared with the condition without suppression; whereas with the addition of N2 ，the molar fractions of H radicals and OH radicals were almost unchanged compared with the condition without suppression. The combined injection mode of "near-flame end + large angle" could maximize the synergistic suppression effect of CO2 in terms of radical consumption， physical heat absorption， and combustible gas dilution， while the combined injection mode of "far-flame end + small angle" weakened the suppression efficiency of inert gas due to the dual limitations of diffusion delay and gas mixing non-uniformity.
Key words： gas mixture explosion; inert gas suppression; gas injection position; gas injection angle explosion pressure; flame propagation speed; flame front temperature; radicals
0引言
矿井中可燃气体成分多样，除常见的 CH4 外，在煤油共生矿井的煤层气中还含有 H2 ，尤其在煤层局部氧化和煤岩破碎区化学反应活跃的开采场景下，易大量释放 H2 导致局部混合气体中 H2 比例显著升高[1-3]。（剩余11914字）
