Effect of CO<sub>2</sub>-ultrafine water mist on initial explosion characteristics of CH<sub>4</sub>/Air

PEI Bei; WEI Shuangming; CHEN Liwei; PAN Rongkun; WANG Yan; YU Minggao; LI Jie

doi:10.11883/bzycj-2018-0147

Volume 39 Issue 2

Feb. 2019

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PEI Bei, WEI Shuangming, CHEN Liwei, PAN Rongkun, WANG Yan, YU Minggao, LI Jie. Effect of CO2-ultrafine water mist on initial explosion characteristics of CH4/Air[J]. Explosion And Shock Waves, 2019, 39(2): 025402. doi: 10.11883/bzycj-2018-0147

Citation:

PEI Bei, WEI Shuangming, CHEN Liwei, PAN Rongkun, WANG Yan, YU Minggao, LI Jie. Effect of CO₂-ultrafine water mist on initial explosion characteristics of CH₄/Air[J]. Explosion And Shock Waves, 2019, 39(2): 025402. doi: 10.11883/bzycj-2018-0147

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Effect of CO₂-ultrafine water mist on initial explosion characteristics of CH₄/Air

doi: 10.11883/bzycj-2018-0147

1.
The Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
State Key Laboratory of Coal Mine Disaster Dynamics Control, Chongqing University, Chongqing 400044, China

Received Date: 2018-04-27
Rev Recd Date: 2018-05-22
Publish Date: 2019-02-05

Abstract

Abstract

In order to study the effect of CO₂ and ultrafine water mist on the initial 9.5% methane/air explosion characteristics, a high speed schlieren system and a constant volume combustion bomb were used to study the 9.5% methane/air explosion characteristics. By changing the dilution volume fraction of CO₂ and mass concentration of ultrafine water mist respectively, the change rules of flame propagation speed and explosion overpressure were analyzed under two separate and combined actions. The results show that the ultrafine water mist with a mass concentration of 58.3 g/m³ enhanced the instability of the flame and accelerated flame acceleration and explosion overpressure. This indicates that the insufficiency of the ultrafine water mist can produce detonation promotion, and the methane explosion will be suppressed only when the ultrafine water mist is sufficient. When CO₂ and ultrafine water mist act together, it can avoid the explosion phenomenon caused by ultrafine water mist, weaken the instability of spherical flame significantly, reduce the propagation velocity of the spherical flame, decrease the explosion overpressure and the mean rate of pressure rise, and delay the arrival time of the overpressure peak. This study can provide a guidance for the prevention of methane explosion.
- carbon dioxide,
- ultrafine water mist,
- methane/air,
- initial explosion characteristics

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References(23)

References

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