Explosion severity parameters of hybrid mixture of methane and lycopodium dust
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摘要: 基于改进的20 L球形粉尘爆炸装置，在相同初始条件下分别测量了甲烷、石松子粉尘和甲烷/石松子两相混合体系的爆炸压力、爆炸压力上升速率和爆炸指数等参数，系统研究了甲烷/石松子粉尘两相混合体系爆炸特性变化规律。结果表明：甲烷的添加能显著提高低质量浓度石松子粉尘爆炸压力而降低高质量浓度石松子粉尘爆炸压力；甲烷对石松子粉尘最大爆炸压力没有显著影响，但能显著提高石松子粉尘最大爆炸压力上升速率。甲烷/石松子粉尘混合体系爆炸指数高于单相石松子粉尘爆炸指数，但甲烷/石松子粉尘混合体系和单相石松子粉尘爆炸指数均低于单相甲烷爆炸指数。工业生产过程中应避免粉尘混入可燃气体以降低粉尘爆炸危险性。Abstract: A modified 20 L standard spherical dust explosion vessel was used to systematically study the explosion characteristics of the methane/lycopodium hybrid mixtures. The explosion pressure (pex), the explosion pressure rise rate (dp/dt)ex and the explosive deflagration index (Kst) of the single-phase methane, the single-phase lycopodium dust, and the methane/lycopodium hybrid mixtures were measured under the same initial conditions. The results showed that methane could obviously enhance the explosion pressure pex of low-concentration lycopodium dust but reduce the pex of high-concentration lycopodium dust. It was proved that methane had no significant effects on the maximum explosion pressure pmax of lycopodium dust. But it could significantly increase the maximum explosion pressure rise rate (dp/dt)max. By evaluating the Kst, it was found that the explosive deflagration index of the methane/lycopodium hybrid mixtures was higher than that of single-phase lycopodium dust. However, the explosive deflagration indices of both methane/lycopodium hybrid mixtures and single-phase lycopodium dusts were lower than that of single-phase methane. Therefore, the coexistence of combustible gas and combustible dust in industrial production process should be avoided to reduce the risk of dust explosions.
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Key words:
- dust explosion /
- hybrid mixtures /
- explosion severity /
- methane /
- lycopodium
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图 3 石松子粉尘粒径分布(D[50]=39 μm)
Figure 3. Particle size distribution of lycopodium dust with D[50]=39 μm
图 4 甲烷体积分数为0%、2%、4%、6%、8%、10%和12%时石松子粉尘爆炸压力
Figure 4. Explosion pressure of lycopodium dust at the methane mass fractions of 0%, 2%, 4%, 6%, 8%, 10% and 12%
图 5 甲烷/石松子混合体系爆炸压力
Figure 5. Explosion pressure of hybrid mixtures of methane and lycopodium dust
图 6 甲烷/石松子混合体系的最佳爆炸质量浓度随甲烷体积分数的变化
Figure 6. Optimum mass concentration of methane/lycopodium mixtures varying with methane volume fraction
图 7 石松子粉尘最大爆炸升压速率随甲烷体积分数的变化
Figure 7. Maximum explosion pressure rise rate of lycopodium dust at different methane volume fractions
表 1 甲烷、石松子粉尘及甲烷/石松子混合体系爆燃指数
Table 1. Explosive deflagration indices of methane, lycopodium and methane/lycopodium mixtures
φ/% ρ/(g·m-3) (dp/dt)max/(MPa·s-1) Kst(KG)/(MPa·m·s-1) 0(pure dust) 750 18.81 5.11 2 750 19.98 5.42 4 500 21.16 5.74 6 250 28.21 7.66 10(pure CH4) 0 126.94 34.46 
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