Experimental study on the suppression of methane-air explosion by CF3I and CO2
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摘要: 为了探究三氟碘甲烷CF3I和二氧化碳CO2复合使用对甲烷爆炸的抑制效果，采用容积为20 L的球形爆炸实验装置，研究了单独和复合使用三氟碘甲烷和二氧化碳对甲烷爆炸压力特性的影响。研究结果表明：添加三氟碘甲烷和二氧化碳后，甲烷爆炸极限范围逐渐缩小，且三氟碘甲烷对甲烷爆炸极限的影响更显著，当三氟碘甲烷和二氧化碳的体积分数分别达到5.5%和32.0%时，甲烷爆炸上下限重合，临界氧的体积分数分别为17.85%和12.50%。可见三氟碘甲烷对甲烷爆炸极限的影响机制与二氧化碳不同，并不是通过降氧为主而发挥抑制作用的。三氟碘甲烷对甲烷爆炸的抑制效果明显优于二氧化碳，对比体积分数为9.5%的甲烷爆炸最大爆炸压力和最大爆炸压力上升速率下降的比率，5.0%三氟碘甲烷的抑爆效果约是等量二氧化碳的6倍和5倍。二氧化碳掺混少量三氟碘甲烷后，抑爆效果大幅提升，掺混比例越，高效果越明显，且对抑制甲烷爆炸压力作用的提升更显著。三氟碘甲烷掺混体积分数大于等于1.0%时，二氧化碳单位增量导致甲烷最大爆炸压力下降的幅度有所增加。这说明三氟碘甲烷的加入具有改善抑爆效果和增强抑爆效率的双重作用。Abstract: To explore the inhibitory effect of the combined use of trifluoroiodomethane and carbon dioxide on methane explosion, a 20-L spherical explosion experimental system was used to carry out explosion experiments under different methane volume fractions when the two were used alone and in combination. The variation law of methane explosion pressure characteristics under different working conditions was studied. The results show that after adding trifluoroiodomethane and carbon dioxide, the explosion limit of methane is gradually reduced, and the effect of trifluoroiodomethane on the explosion limit of methane is more obvious. When the volume fractions of trifluoroiodomethane and carbon dioxide reached 5.5% and 32.0%, respectively, the upper and lower explosion limits of methane coincided, and at this moment the corresponding critical oxygen volume fractions were 17.85% and 12.50%, respectively. The affection mechanism of trifluoroiodomethane on the explosion limit of methane is different from that of carbon dioxide, and it does not exert an inhibitory effect mainly by reducing oxygen. The inhibition effect of trifluoroiodomethane on methane explosion is significantly better than that of carbon dioxide. Compared with the decrease ratio of the maximum explosion pressure and the maximum explosion pressure rise rate of 9.5% methane, the suppression explosion effects of 5% trifluoroiodomethane are about 6 times and 5 times as strong as those of the same amount of carbon dioxide. After carbon dioxide is mixed with a small amount of trifluoroiodomethane, the suppression explosion effect is greatly improved. Furthermore, the higher ratio of adding trifluoroiodomethane, the more obvious the effect. When the volume fraction of trifluoroiodomethane is greater than or equal to 1.0%, the magnitude of the drop in the maximum explosion pressure of methane has increased due to the increment of carbon dioxide units. It is indicated that the addition of trifluoroiodomethane has the dual effect of improving the explosion suppression effect and enhancing the explosion suppression efficiency when carbon dioxide is used to suppress methane explosion.
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Key words:
- methane explosion /
- trifluoromethyl iodide /
- carbon dioxide /
- explosion pressure /
- explosion suppression
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图 2 CF3I和CO2对CH4爆炸极限的影响
Figure 2. Effect of CF3I and CO2 on the explosion limit of CH4
图 3 CF3I和CO2的比定容热容
Figure 3. Specific heat capacity at constant volume of CF3I and CO2
图 4 CF3I和CO2对CH4爆炸压力曲线的影响
Figure 4. Effect of CF3I and CH4 on methane explosion pressure curve
图 5 CF3I和CO2对CH4爆炸压力参数的影响
Figure 5. Effects of CF3I and CO2 on the pressure parameters of CH4 explosion
图 6 复合抑爆剂对9.5%的CH4爆炸压力参数的影响
Figure 6. Effect of compound explosion suppressor on explosion pressure parameters of 9.5% CH4
表 1 实验工况
Table 1. Experimental conditions
编号 工况 编号 工况 编号 工况 1 9.5%CH4 11 9.5%CH4+15.0%CO2 22 9.5%CH4+1.0%CF3I+14.0%CO2 2 9.5%CH4+0.5%CF3I 12 9.5%CH4+20.0%CO2 23 9.5%CH4+1.0%CF3I+19.0%CO2 3 9.5%CH4+1.0%CF3I 13 9.5%CH4+25.0%CO2 24 9.5%CH4+1.0%CF3I+24.0%CO2 4 9.5%CH4+1.5%CF3I 14 9.5%CH4+0.5%CF3I+4.5%CO2 25 9.5%CH4+1.5%CF3I+3.5%CO2 5 9.5%CH4+2.0%CF3I 15 9.5%CH4+0.5%CF3I+9.5%CO2 26 9.5%CH4+1.5%CF3I+8.5%CO2 6 9.5%CH4+3.0%CF3I 16 9.5%CH4+0.5%CF3I+14.5%CO2 27 9.5%CH4+1.5%CF3I+13.5%CO2 7 9.5%CH4+4.0%CF3I 17 9.5%CH4+0.5%CF3I+19.5%CO2 28 9.5%CH4+1.5%CF3I+18.5%CO2 8 9.5%CH4+5.0%CF3I 18 9.5%CH4+0.5%CF3I+24.5%CO2 29 9.5%CH4+1.5%CF3I+23.5%CO2 9 9.5%CH4+5.0%CO2 19 9.5%CH4+1.0%CF3I+4.0%CO2 10 9.5%CH4+10.0%CO2 21 9.5%CH4+1.0%CF3I+9.0%CO2 
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