Experimental study on hydrogen-blended natural gas explosion in utility tunnels: Explosion control and optimization strategy

IF 4.2 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Jiaojiao Cao, Tong Xu, Jiansong Wu
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引用次数: 0

Abstract

At present, there are almost no explosion control measures and optimization strategies suitable for the gas compartment of utility tunnels. The optimized layout of gas explosion energy mitigation measures with efficient, economical and safe can prevent explosion accidents from destroying utility tunnels. The control efficiency of explosion severity of hydrogen-blended natural gas (HBNG) under combined explosion control measures was explored. The control measures (CM) include vent, spray, energy-absorbing materials, and cavity, and their control effects are compared. The results show that the control effect on explosive energy of CM is ranked as central vent > energy-absorbing materials > end vent > cavity. The spray is highly effective in extinguishing flames but has relatively poor suppression effect on overpressure. Under the combined action of reverse stretching at the central vent and the spray water curtain wall, a V-shaped flame is presented, indicating a slowing of flame speed. The combination of the central vent and the energy-absorbing material enhances the dissipation and transfer of the explosion energy, and cavity and central vent hinder the flame propagation under the action of the suction. Under the closed utility tunnel, the fire extinguishing effect of energy-absorbing material and spray is the best, and the effect of energy-absorbing material and cavity is the worst. The optimal strategy for controlling explosion propagation in the utility tunnel is the combination of vent, cavity and energy-absorbing material. This study provides theoretical support for ensuring energy supply security in urban utility tunnels.
公用隧道混氢天然气爆炸试验研究:爆炸控制与优化策略
目前,几乎没有适用于公用隧道瓦斯室的爆炸控制措施和优化策略。高效、经济、安全的瓦斯爆炸消能措施优化布置,可有效防止爆炸事故对公用隧道的破坏。探讨了混合爆炸控制措施下氢混合天然气(HBNG)爆炸严重程度的控制效果。采用排风、喷雾、吸能材料和空腔等控制措施,对其控制效果进行了比较。结果表明:CM对爆炸能量的控制作用为中心喷口>;吸能材料;结束排气>;腔。喷雾灭火效果好,但对超压的抑制效果相对较差。在中央通风口反向拉伸和喷水水幕的共同作用下,火焰呈v型,表明火焰速度变慢。中心通风口与吸能材料的结合增强了爆炸能量的耗散和传递,空腔和中心通风口在吸力作用下阻碍了火焰的传播。在封闭式公用隧道下,吸能材料和喷雾灭火效果最好,吸能材料和空腔灭火效果最差。通风口、空腔和吸能材料相结合是控制综合隧道爆炸传播的最优策略。该研究为保障城市公用隧道的能源供应安全提供了理论支持。
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来源期刊
CiteScore
7.20
自引率
14.30%
发文量
226
审稿时长
52 days
期刊介绍: The broad scope of the journal is process safety. Process safety is defined as the prevention and mitigation of process-related injuries and damage arising from process incidents involving fire, explosion and toxic release. Such undesired events occur in the process industries during the use, storage, manufacture, handling, and transportation of highly hazardous chemicals.
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