Research and Application of Materials Science

Study on Gas Explosion Characteristics in Urban Utility Tunnels

HongfuMI (Chongqing University of Science and Technology), ZHANGHaoliang (Chongqing University of Science and Technology), LIAOKaixuan (Chongqing University of Science and Technology), LUONan (Chongqing University of Science and Technology), LIAOHuiqian (Chongqing University of Science and Technology)

Abstract


In order to study the effects of three factors, namely, premixed gas concentration, number of pressure relief ports and number of obstacles, on the overpressure characteristics of gas explosion and flame structure of gas chambers in utility tunnels, in this paper, a small and narrow experimental platform for gas explosion was constructed to study the evolution mechanism and law of the kinetic characteristics and flame behavior of gas explosion in utility tunnels, with a view to revealing the special influencing mechanism of the overpressure characteristics and flame behavior of gas explosion in utility tunnels. The results show that in the methane concentration of 9.5% when the explosion overpressure reaches its peak, and at the same time by the utility tunnel long and narrow restricted space, the explosion generated by the precursor shock wave along with the flame compression wave were superimposed on both ends of the pipeline back and forth for many times so that the overpressure waveforms are cyclic oscillatory trend, increasing the explosion hazards; compared with the closed conditions, the relief port on the overpressure characteristics of the significant impact of the maximum decrease of 57.7%, when the frequency of overpressure oscillation is reduced, the gas explosion generated by the overpressure damage is reduced; the presence of obstacles significantly affects the flow field, accelerates the flame propagation and leads to greater overpressure peaks and overpressure oscillations. The conclusions of the study can provide a basis for the safety of natural gas in utility tunnels.

Keywords


Utility tunnels, gas explosions, explosion overpressure, overpressure oscillations, flame development

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References


Yiping BAI, Rui ZHOU, Jiansong WU, et al.. Hazard identification and analysis of urban utility tunnels in China[J]. Tunnelling and Underground Space Technology, 2020,(103):103584.

LUO Y, ALAGHBANDRAD A, GENGER T K, et al.. History and recent development of multi-purpose utility tunnels[J]. Tunnelling and Underground Space Technology, 2020,103:103511.

CHEN Z-L, CHEN J-Y, LIU H, et al.. Present status and development trends of underground space in Chinese cities: Evaluation and analysis[J]. Tunnelling and Underground Space Technology, 2018(71):253-270.

Jingpeng WANG. Overview of the role-playing of underground utility tunnels construction in urban development[J]. Housing & Real Estate, 2020(9):257.

Hang LIU. An overview of the application of internet of things technology in the construction of urban utility tunnels[J]. Modern Information Technology, 2020,4(4):170–173.

Dongwu Wang, Chunzhi DU. Experimental study on the propagation law of tunnel gas explosion[J]. Journal of Mining and Safety Engineering, 2009,26(4):475-485.

Quan WANG, Ziru GUO, Zhiming LI, et al.. Experimental Study on the Propagation Characteristics of Methane-Air Premixed Flame in a Confined Tube[J]. Coal Science and Technology, 2007(11):95-97+100.

Xingzhong ZHENG, Dan ZHENG. Experimental Study on the Influence of Methane Concentration and Ignition Energy on the Length of Gas Explosion Flame[J]. Fire Technology and Product Information, 2015(03):12-15.

Shengguo CHEN, Yansong ZHANG, Jian LIU, et al.. Experimental Study on the Propagation Law of Natural Gas Explosion Flame and Pressure Wave in Pipeline[J]. China Safety Science Journal, 2013,9(10):43-48.

HARIHARAN A, WICHMAN I S. Premixed Flame Propagation and Morphology in a Constant Volume Combustion Chamber[J]. Combustion Science and Technology, Taylor & Francis, 2014,186(8):1025–1040.

Jinsheng XU, Yang LIU, Xianfeng CHEN, et al.. Influence of Methane-to-Air Mass Concentration Ratio on Flame Structure and Propagation Characteristics[J]. China Safety Science Journal, 2014,24(9):64-69.

TOMLIN G, JOHNSON D M, CRONIN P, et al.. The effect of vent size and congestion in largescale vented natural gas/air explosions[J]. Journal of Loss Prevention In The Process Industries, 2015(35):169-181.

MEON I. The influence of Turbulence on Flame Propagation in Obstacle Environments[C]. Montreal, Prof of First International Specialist Meeting on Fuel, Air Explosions, 1981.

Barry P K. Acceleration of a flame by flame-vortex interactions[J]. Combustion And Flame, 1990(82):115-125.

Jiahong JIANG, et al.. Study on the Distribution Law of Gas-Cloud Explosion Field in Urban Comprehensive Pipe Gallery[D]. Nanjing: Nanjing University of Science and Technology, 2018.

XU Y, HUANG Y, LI J, et al.. A risk-based optimal pressure relief opening design for gas explosions in underground utility tunnels[J]. Tunnelling and Underground Space Technology, 2021(116):104091.

WANG S, LI Z, FANG Q, et al.. Numerical simulation of overpressure loads generated by gas explosions in utility tunnels[J]. Process Safety and Environmental Protection, 2022(161):100-117.

Xinsheng JIANG, Wei XIE, Yadong ZHAO, et al.. Experimental Study on Oil and Gas Explosion in Long and Narrow Pipelines with Different Length-to-Diameter Ratios[J]. Oil & Gas Storage and Transportation, 2020,39(8): 879-884.

Zhenmin LUO, Jing SHI, Tao WANG, et al.. Study on the Influence of NH3 on CH4 Explosion Characteristics and Reaction Kinetics[J]. Journal of Safety Science and Technology, China, 2020,30(9):51-58.

L PANG, T WANG, Q ZHANG, et al.. Nonlinear distribution characteristics of flame regions from methane–air explosions in coal tunnels[J]. Process Safety and Environmental Protection, 2014(92):193-198.

J WEERHEIJM, J VERREAULT, M. VAN DER VOORT, et al.. Quantitative risk analysis of gas explosions in tunnels[J]. Fire Safety Journal, 2018(97):146-158.

L WANG, H MA, Z SHEN, et al.. A comparative study of the explosion behaviors of H2 and C2H4 with air, N2O and O2[J]. Fire Safety Journal, 2021(119):103260.

LIY C, BI M S, ZHOU Y H, et al.. Experimental and theoretical evaluation of hydrogen cloud explosion with built-in obstacles[J]. International Journal of Hydrogen Energy, 2020,45(51):28007-28018.

GUO C W, JIANG S G, SHAO H, et al.. Suppression effect and mechanism of fly ash on gas explosions[J]. Journal of Loss Prevention in the Process Industries, 2022(74):104643.

WANG Q H, SUN Y L, JIANG J C, et al.. Inhibiting effects of gas-particle mixtures containing CO2, Mg(OH)2 particles, and NH4H2PO4 particles on methane explosion in a 20-L closed vessel[J]. Journal of Loss Prevention in the Process Industries, 2020(645):104082.

DU Y,ZHANG P L,ZHOU Y,et al.. Suppressions of gasoline-air mixture explosion by non-premixed nitrogen in a closed tunnel[J]. Journal of Loss Prevention in the Process Industries, 2014(31):113-120.

Tingxi XU, Xuede WANG, Xiaobo ZHANG, et al.. Numerical Study on the Influence of Air Intake Position on Inerting Characteristics of Fuel Tanks[J]. Aeronautical Computing Technique, 2015,45(4):105–108.

Shuwang WEI, Xinsheng JIANG, Biao HE, et al.. Experimental Study on the Inhibition of Oil and Gas Explosions in Narrow and Confined Spaces by C3HF7 [J]. China Safety Science Journal, 2016,12(7):128–133.




DOI: https://doi.org/10.33142/rams.v5i2.12706

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