Ambient Humidity Influence on Explosion Characteristics of Methane-Air Mixture
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摘要: 为了解煤矿井下气体爆炸作用的规律，实验研究了不同环境湿度条件下的气体爆炸极限和爆炸压力，分析了水蒸气组分对瓦斯爆炸压力的抑制作用。研究结果表明：预混气体由干燥向水蒸气饱和状态转变时，瓦斯爆炸下限上升0.11%，爆炸上限下降0.31%，爆炸极限范围缩小，相应的最大爆炸压力和最大压力上升速率分别由0.802 MPa和23.38 MPa/s衰减到0.746 MPa和18.59 MPa/s，预混气体中的水蒸气起到抑制瓦斯爆炸的作用效果。Abstract: For the purpose of understanding the law of coal mine gas explosion, gas explosion characteristics under different ambient humidity conditions were experimentally determined, and the inhibition of water vapor on gas explosion is analyzed.The results show that when the premixed gas varies from dry state to saturation state, the upper and lower explosion limits decrease and increase by 0.31% and 0.11% respectively, and the explosion concentration range is reduced; the corresponding maximum explosion pressure and the maximum rate of pressure rise decay from 0.802 MPa and 23.38 MPa/s to 0.746 MPa and 18.59 MPa/s.The vapor components in premixed gas play an effective role in suppression of gas explosion.
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Key words:
- gas explosion /
- ambient humidity /
- water vapor /
- explosion limit /
- explosion pressure
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图 1 气体爆炸特性测试系统示意图
Figure 1. Schematic of gas explosion characteristic experiment system
图 2 瓦斯气体爆炸压力特性特征参数变化规律
Figure 2. Explosion pressure characteristic parameters in the methane-air mixture
图 3 最佳爆炸浓度下瓦斯的爆炸压力和压力上升速率曲线
Figure 3. Curves of gas explosion pressure and pressure rise rate under optimum concentration
表 1 甲烷-空气混合气体中各组分的体积分数
Table 1. Volume fractions of the components in the methane-air mixture
Component Volume fraction/(%) CH4 φ O2 0.21(1-φ-η pf/p0) N2 0.78(1-φ-η pf/p0) H2O η pf/p0 
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表 2 爆炸极限测定值
Table 2. Explosion limit values
Relative humidity/(%) Lower explosion limit/(%) Upper explosion limit/(%) ≤15 4.91 14.86 63±5 4.97 14.71 ≥92 5.02 14.55
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表 3 爆炸压力特性实验结果
Table 3. Experimental results of explosion pressure
Relative humidity/(%) pmax/(MPa) (dp/dt)max/(MPa/s) KG/(MPa·m/s) ≤15 0.802 23.38 6.346 63±5 0.775 19.89 5.399 ≥92 0.746 18.59 5.046
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