Effect of blockage ratios on the characteristics of methane/air explosions suppressed by dry chemicals

ZHENG Ligang; LI Gang; WANG Yalei; ZHU Xiaochao; Dou Zengguo; DU Depeng; YU Minggao

doi:10.11883/bzycj-2018-0228

Volume 39 Issue 11

Nov. 2019

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ZHENG Ligang, LI Gang, WANG Yalei, ZHU Xiaochao, Dou Zengguo, DU Depeng, YU Minggao. Effect of blockage ratios on the characteristics of methane/air explosions suppressed by dry chemicals[J]. Explosion And Shock Waves, 2019, 39(11): 115403. doi: 10.11883/bzycj-2018-0228

Citation:

ZHENG Ligang, LI Gang, WANG Yalei, ZHU Xiaochao, Dou Zengguo, DU Depeng, YU Minggao. Effect of blockage ratios on the characteristics of methane/air explosions suppressed by dry chemicals[J]. Explosion And Shock Waves, 2019, 39(11): 115403. doi: 10.11883/bzycj-2018-0228

Citation:

ZHENG Ligang, LI Gang, WANG Yalei, ZHU Xiaochao, Dou Zengguo, DU Depeng, YU Minggao. Effect of blockage ratios on the characteristics of methane/air explosions suppressed by dry chemicals[J]. Explosion And Shock Waves, 2019, 39(11): 115403. doi: 10.11883/bzycj-2018-0228

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Effect of blockage ratios on the characteristics of methane/air explosions suppressed by dry chemicals

doi: 10.11883/bzycj-2018-0228

ZHENG Ligang^{1, 3
,},
LI Gang^{1, 3},
WANG Yalei^{1, 3},
ZHU Xiaochao^{1, 3},
Dou Zengguo^{1, 3},
DU Depeng^{1, 3},
YU Minggao^{2
,
,}

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
3.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received Date: 2018-06-26
Rev Recd Date: 2018-08-22
Publish Date: 2019-11-01

Abstract

Abstract

To investigate the effect of blockage ratios (φ) on the inhibited flame, an experimental study was performed to suppress the methane-air explosions in a 5 L duct with the blockage ratios φ = 0, 0.2, 0.4, 0.6, 0.7, 1.0 under BC and Al(OH)₃ inhibitors with the mass concentrations C = 0 g/m³, 80 g/m³, 160 g/m³ and 240 g/m³. The results indicated that the flame fragmentation increased with the improvement of the suppression efficiency. The maximum explosion pressure (p_max) and the deflagration index of the explosion (K_st) were dominated by the combustion rate and the discharge rate. Furthermore, φ = 0.7 was the inflection point of p_max and K_st curves. The drop rate in the P_max (δ) firstly increased and then decreased as the blockage ratio increased. And the maximum δ_max was achieved at the blockage ratio between 0.4 with 0.6. In general, the suppression efficiency of Al(OH)₃ and NaHCO₃ powders was comparable. However, the low turbulence caused by certain blocking ratios impacted the sedimentation of inhibitor particles, which made the suppression efficiency of Al(OH)₃ better than that of NaHCO₃. There was an increasing heat resistance as the powder concentration increased from 80 g/m³ to 240 g/m³, which blocked the penetration of heat from the flame into the interior of particle cloud and disabled interior particles’ thermal decomposition, leading to a weakening concentration effect.
- blockage ratios,
- powder concentration,
- explosion suppression,
- methane explosion

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References(27)

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