TY - JOUR
T1 - Experimental study on vented explosion overpressure of methane/air mixtures in manhole
AU - Li, Pengliang
AU - Huang, Ping
AU - Liu, Zhenyi
AU - Du, Bingxuan
AU - Li, Mingzhi
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/7/15
Y1 - 2019/7/15
N2 - Gas explosion in manhole often occurs in cities. Many previous researches on gas explosion are not suitable for manhole explosion because of the particularity of manhole structure. To investigate the gas explosion in manhole, a full-scale manhole model was established, in which the explosion overpressure of methane/air mixtures were studied experimentally. The variation of blast wave overpressure with time at different distances was analyzed. In addition, the effects of methane concentration, ignition location and manhole cover weight on the external overpressure after manhole explosion were obtained. The results showed that at the experimental conditions in this paper, under the influence of vent mode and flame propagation, the maximum peak overpressure caused by manhole explosion was mostly at the third measuring point. And there were two peaks in the overpressure histories. It was also found that when the methane concentration was close to stoichiometric ratio, the ignition location was further away from the manhole head, and the weight of manhole cover increased, the peak overpressure of blast wave caused by explosion increased. Besides, some suggestions were put forward for the risk control of manhole explosion accident based on the experimental results.
AB - Gas explosion in manhole often occurs in cities. Many previous researches on gas explosion are not suitable for manhole explosion because of the particularity of manhole structure. To investigate the gas explosion in manhole, a full-scale manhole model was established, in which the explosion overpressure of methane/air mixtures were studied experimentally. The variation of blast wave overpressure with time at different distances was analyzed. In addition, the effects of methane concentration, ignition location and manhole cover weight on the external overpressure after manhole explosion were obtained. The results showed that at the experimental conditions in this paper, under the influence of vent mode and flame propagation, the maximum peak overpressure caused by manhole explosion was mostly at the third measuring point. And there were two peaks in the overpressure histories. It was also found that when the methane concentration was close to stoichiometric ratio, the ignition location was further away from the manhole head, and the weight of manhole cover increased, the peak overpressure of blast wave caused by explosion increased. Besides, some suggestions were put forward for the risk control of manhole explosion accident based on the experimental results.
KW - Cover weight
KW - Ignition location
KW - Manhole
KW - Methane concentration
KW - Overpressure
UR - http://www.scopus.com/inward/record.url?scp=85064541535&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.04.046
DO - 10.1016/j.jhazmat.2019.04.046
M3 - Article
C2 - 31026628
AN - SCOPUS:85064541535
SN - 0304-3894
VL - 374
SP - 349
EP - 355
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -