Experimental study on the suppression of methane-air explosion by CF<sub>3</sub>I and CO<sub>2</sub>

CHENG Fangming; NAN Fan; XIAO Yang; LUO Zhenmin; NIU Qiaoxia

doi:10.11883/bzycj-2021-0386

Volume 42 Issue 6

Jun. 2022

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CHENG Fangming, NAN Fan, XIAO Yang, LUO Zhenmin, NIU Qiaoxia. Experimental study on the suppression of methane-air explosion by CF3I and CO2[J]. Explosion And Shock Waves, 2022, 42(6): 065402. doi: 10.11883/bzycj-2021-0386

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CHENG Fangming, NAN Fan, XIAO Yang, LUO Zhenmin, NIU Qiaoxia. Experimental study on the suppression of methane-air explosion by CF₃I and CO₂[J]. Explosion And Shock Waves, 2022, 42(6): 065402. doi: 10.11883/bzycj-2021-0386

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Experimental study on the suppression of methane-air explosion by CF₃I and CO₂

doi: 10.11883/bzycj-2021-0386

CHENG Fangming^{1, 2
,},
NAN Fan^{1, 2
,
,},
XIAO Yang^{1, 3},
LUO Zhenmin^{1, 2},
NIU Qiaoxia^{1, 2}

1.
School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
2.
Xi’an Key Laboratory of Urban Public Safety and Fire Rescue, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
3.
Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China

Received Date: 2021-09-15
Rev Recd Date: 2022-04-26

Available Online: 2022-05-07

Publish Date: 2022-06-24

Abstract

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.
- methane explosion,
- trifluoromethyl iodide,
- carbon dioxide,
- explosion pressure,
- explosion suppression

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References

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