The explosion characteristics of anthracite coal dust with/without small amount of CH₄ (1.14 vol %) were investigated by using a 20 L spherical explosion apparatus with an emphasis on the roles of oxygen mole fraction and inert gas. Two methods based on overpressure and combustion duration time were used to determine the minimum explosion concentration (MEC) or the lower explosion limit (LEL) of the pure anthracite coal dust and the hybrid coal-methane mixtures, respectively. The experiment results showed that increasing oxygen mole fraction increases the explosion risk of coal dust: with increasing oxygen mole fraction, the explosion pressure (P_ex) and the rate of explosion pressure rise ((dp/dt)_ex)) increase, while MEC decreases. The explosion risk of anthracite dust was found to be lower after replacing N₂ with CO₂, suggesting that CO₂ has a better inhibition effect on explosion mainly due to its higher specific heat. However, the addition of 1.14% CH₄ moderates the inhibition effect of CO₂ and the promotion effect of O₂ on anthracite dust explosion for some extent, increasing explosion severity and reducing the MEC of anthracite dust. For hybrid anthracite/CH₄ mixture explosions, Barknecht's curve was found to be more accurate and conservative than Chatelier's line, but neither are sufficient from the safety considerations. The experimental results provide a certain help for the explosion prevention and suppression in carbonaceous dust industries.

通过使用20 L球形爆炸仪，重点研究了氧气摩尔分数和惰性气体的作用，研究了有/无CH ₄（1.14 vol％）的无烟煤粉尘的爆炸特性。基于超压和燃烧持续时间的两种方法分别用于确定纯无烟煤粉尘和混合煤-甲烷混合物的最小爆炸浓度（MEC）或爆炸下限（LEL）。实验结果表明，增加氧气摩尔分数会增加煤粉尘爆炸的危险性：随着氧气摩尔分数的增加，爆炸压力（P _ex）和爆炸压力的上升速率（（d p / d t）_ex））增加，而MEC减少。用CO ₂代替N ₂后，无烟煤粉尘的爆炸危险性降低，这表明CO ₂对爆炸的抑制作用更好，这主要是由于其比热较高。然而，添加1.14％的CH ₄在一定程度上减轻了CO ₂的抑制作用和O ₂对无烟煤粉尘爆炸的促进作用，增加了爆炸的严重性并降低了无烟煤粉尘的MEC。用于混合无烟煤/ CH ₄混合物爆炸时，发现Barknecht曲线比Chatelier线更准确和保守，但从安全考虑来看，两者都不足够。实验结果为含碳粉尘工业的爆炸预防和控制提供了一定的帮助。