Inhibition of Methane-Air Explosion by C3HF7 under Strong Ignition
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摘要: 为解决瓦斯输送过程中的爆炸安全问题，探索寻找绿色环保且阻火性能优越的新型抑爆剂，开展了当量比下甲烷-空气预混气体爆炸传播过程中的七氟丙烷抑爆效果研究。实验采用长径比L/D=108的水平管道爆炸特性测试系统，研究了在强点火作用下不同体积分数的七氟丙烷对9.5%甲烷-空气预混气体最大爆炸压力、最大压力上升速率和火焰传播速度的影响。实验结果显示：将2.5 m长的管段作为七氟丙烷抑爆区时，七氟丙烷阻断9.5%甲烷-空气预混气体爆炸火焰传播的最小体积分数为5%；当七氟丙烷的体积分数为1%～4%时，不仅无法阻断爆炸火焰的传播，而且与对照组相比，会使火焰传播速度加快；当七氟丙烷的体积分数为1%～6%时，爆炸源及管道末端处的爆炸压力峰值随着七氟丙烷体积分数的增加而逐渐减小；当七氟丙烷的体积分数为3%时，抑爆区处的爆炸压力峰值与对照组相比增幅为10.9%。Abstract: In this work we carried out research on the anti-explosion effect of heptafluoropropane in the process of methane-air premixed gas explosion propagation in equivalent ratio, in order to solve the explosion accidents in the process of gas transportation. This experiment used a horizontal pipeline explosion characteristic test system with an aspect ratio of L/D=108, studied the effects of different volume fractions of heptafluoropropane on the maximum explosion pressure, maximum pressure rise rate and flame propagation velocity of 9.5% methane-air premixed gas under strong ignition. The experimental results show that when the 2.5 m long pipe section is used as the heptafluoropropane explosion suppression zone, the minimum volume fraction of heptafluoropropane which can suppress the 9.5% methane-air premixed gas explosion flame propagation is 5%; when the concentration of heptafluoropropane is 1% to 4%, the propagation of the explosion flame cannot be suppressed, and the flame propagation speed is accelerated compared with the control group; when the concentration of heptafluoropropane is 1% to 6%, the peak value of the explosion pressure at the source of explosion and end of pipe gradually decreases with the increase of the concentration of heptafluoropropane; when the concentration of heptafluoropropane is 3%, the peak value of the explosion pressure at the explosion suppression zone increase by 10.9% compared with the control group.
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图 1 水平管道爆炸特性测试系统
Figure 1. Horizontal pipeline explosion characteristic test system
1. Compressed air bottle; 2. Gas distribution system; 3. Computer; 4. Detonating fuse head; 5. Vacuum pump; 6. Delay igniter; 7. Programmable logic controller; 8. Data collecting instrument; 9. Mass flow meter; 10. Heptafluoropropane cylinder; 11. High-speed camera; 12. Computer; 13. Exhaust vent.
图 2 七氟丙烷浓度对9.5%甲烷-空气爆炸火焰传播过程的影响
Figure 2. Effect of heptafluoropropane concentration on 9.5% methane-air explosion flame propagation process
图 3 七氟丙烷浓度为5%及6%时对甲烷-空气爆炸火焰传播过程的影响
Figure 3. Picture of effect of heptafluoropropane concentration of 5% and 6% on methane-air explosion flame propagation process
图 4 不同七氟丙烷浓度下甲烷-空气预混气体最大爆炸压力
Figure 4. Pictures of maximum explosion pressure of methane-air mixture under different heptafluoropropane concentrations
图 5 不同七氟丙烷浓度下甲烷-空气预混气体爆炸升压速率曲线
Figure 5. Explosion rate of pressure rise for methane-air premixed gas under different heptafluoropropane concentrations
表 1 七氟丙烷体积对照表
Table 1. Heptafluoropropane volume comparison table
Volume fraction of C3HF7/% Volume of the explosion suppression zone/L Volume of C3HF7/mL 1 7.5 75 2 7.5 150 3 7.5 225 4 7.5 300 5 7.5 375 6 7.5 450 
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表 2 不同七氟丙烷浓度下甲烷-空气预混气体爆炸最大爆炸升压速率
Table 2. Maximum rate of pressure rise of methane-air premixed gas explosion under different heptafluoropropane concentrations
Volume fraction of C3HF7/% Maximum rate of
pressure rise I/(MPa·s−1)Maximum rate of
pressure rise II/(MPa·s−1)Maximum rate of
pressure rise III/(MPa·s−1)0 2.416 2.309 2.413 1 2.500 1.647 2.386 2 2.367 2.203 2.046 3 1.945 1.900 2.396 4 1.925 1.840 2.010 5 1.302 1.231 1.411 6 1.385 1.313 1.346
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