The Frontier Energy Technologies Centre, Chemical Engineering, School of Engineering, Faculty of Engineering & Built Environment, The University of Newcastle, Callaghan, NSW 2308, Australia.
The Frontier Energy Technologies Centre, Chemical Engineering, School of Engineering, Faculty of Engineering & Built Environment, The University of Newcastle, Callaghan, NSW 2308, Australia.
J Hazard Mater. 2018 Mar 5;345:38-47. doi: 10.1016/j.jhazmat.2017.11.014. Epub 2017 Nov 7.
Venting is often used in process industries to reduce the possibility of dangerous rises in pressure levels and the severity of explosions. To date, the effectiveness of side-on venting on methane flame deflagration in large scale operations has not been clearly addressed. This work explicitly investigates the influences of side-on venting on varied methane flame deflagration concentrations in a 30m long Detonation Tube (DT).
corresponding to this study prove the existence of a significant correlation between the fire and explosion driving parameters such as pressure rise and flame propagation velocity with the vent location. It observed venting the explosion at distance between 6.5m and 20.5m from the ignition source resulted in reducing the explosion total pressure by about 33% to 56%. For methane concentration of 7.5% the dynamic and static pressures reduced by about 66% and 33%, respectively. The reduced pressure observed to decelerate the flame velocity by about 70%. Significant pressure rise and flame deflagration velocity reductions were observed in both upstream and downstream of the DT corresponding to the location of the vent. For high methane concentrations vacuum effect observed to drawback the flame into the vent and trigger the secondary pressure rise.
在过程工业中，通风通常用于降低压力水平危险升高和爆炸严重程度的可能性。迄今为止，侧通风对大规模操作中甲烷火焰爆炸的有效性尚未得到明确解决。这项工作明确研究了侧通风对 30 米长爆轰管（DT）中不同甲烷火焰爆炸浓度的影响。
与本研究相关的结果证明了火灾和爆炸驱动参数（如压力上升和火焰传播速度）与通风位置之间存在显著相关性。观察到在距离点火源 6.5m 至 20.5m 处通风爆炸，可将爆炸总压力降低约 33%至 56%。对于甲烷浓度为 7.5%，动压和静压分别降低约 66%和 33%。观察到降低的压力使火焰速度降低约 70%。在 DT 的上游和下游都观察到了显著的压力上升和火焰爆炸速度降低，这与通风口的位置相对应。对于高甲烷浓度，观察到真空效应将火焰吸入通风口并引发二次压力上升。
