Effect of sodium bicarbonate powder on the process of ducted venting

YU Minggao; FU Yuanpeng; ZHENG Ligang; WANG Xi; YANG Wen; JIN Hongwang

doi:10.11883/bzycj-2020-0437

Volume 41 Issue 9

Sep. 2021

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YU Minggao, FU Yuanpeng, ZHENG Ligang, WANG Xi, YANG Wen, JIN Hongwang. Effect of sodium bicarbonate powder on the process of ducted venting[J]. Explosion And Shock Waves, 2021, 41(9): 095403. doi: 10.11883/bzycj-2020-0437

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YU Minggao, FU Yuanpeng, ZHENG Ligang, WANG Xi, YANG Wen, JIN Hongwang. Effect of sodium bicarbonate powder on the process of ducted venting[J]. Explosion And Shock Waves, 2021, 41(9): 095403. doi: 10.11883/bzycj-2020-0437

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Effect of sodium bicarbonate powder on the process of ducted venting

doi: 10.11883/bzycj-2020-0437

YU Minggao^{1, 2
,},
FU Yuanpeng¹,
ZHENG Ligang^{1, 3
,
,},
WANG Xi¹,
YANG Wen¹,
JIN Hongwang¹

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
State Key Laboratory of Coal Mine Disaster Dynamics Control, Chongqing University, Chongqing 400044, China
3.
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received Date: 2020-11-24
Rev Recd Date: 2020-12-25

Available Online: 2021-08-30

Publish Date: 2021-09-14

Abstract

Abstract

To investigate the effect of sodium bicarbonate on the process of ducted venting, an experimental study was performed to suppress the methane-air explosions in a 5 L vessel connected with different duct length (250, 500, 750 mm) under NaHCO₃ dry powder with the mass concentration C=0, 40, 80, 120, 160, 200, 240 g/m³. The flame front propagation and explosion overpressure waveform were analyzed. The results show that NaHCO₃ powder greatly weakened the secondary explosion in the discharge duct, and the appropriate mass concentration of NaHCO₃ powder eliminated the secondary explosion. As the NaHCO₃ powder mass concentration increased, the flame structure in the vessel was gradually irregular, and the flame in the discharge duct went through the process of weakening to extinguishing. Moreover, the time for the flame to reach the end of the vessel was prolonged with the increase of powder mass concentration. Different mass concentration of NaHCO₃ dry powder led to three development modes of flame velocity. The mechanism for the pressure rise in the vessel depended on the NaHCO₃ powder mass concentration. The maximum pressure in the vessel was mainly dominated by the second pressure peak for the low powder mass concentration, but by the first pressure peak for the high powder mass concentration. The drop rate of overpressure increased at first and then leveled off with the increase of NaHCO₃ powder mass concentration, which indicates that the mass concentration effect gradually weaken. Finally, the relationship between flame propagation velocity and explosion overpressure in the ducted vented vessel was quantitatively analyzed.
- methane explosion,
- ducted venting,
- explosion suppression,
- powder mass concentration

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References(29)

References

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