Natural gas leakage explosion accidents occurred frequently in dining venues, leading to serious human injuries and economic loss. In this study, a gas leakage and non-uniform explosion numerical model of a typical large dining venue located in Chengdu, China, are established, respectively. To validate the accuracy of the present numerical model, a small-scale experiment platform for gas leakage and explosion has been developed. To analyze the temporal evolution and spatial distribution characteristics of gas concentration and explosion overpressure, gas leakage dispersion and non-uniform premixed explosion simulations are conducted, respectively. In addition, the influence of pressure relief ratio and glass broken pressure on the overpressure peak are investigated to propose effective pressure relief measures. Research results show that there is good agreement between the simulation results produced by the numerical model and the experimental data. Guests should try to choose the dining tables near the windows with good ventilation conditions in dining venues, whereas those located at the corner should be avoided. It is recommended that the minimum pressure relief area ratio should be higher than 0.182 and single-glass windows or doors should be selected as the pressure relief panels. The dining venues with poor ventilation conditions must not utilize natural gas, unless the leakage alarm device, automatic shutoff valve, and mechanical ventilation facilities are interlocked together. This study could provide important theoretical guidance and effective technical support for safe gas use in large dining venues.
EberweinRRoggeABehrendtF, et al. Dispersion modeling of LNG-Vapor on land-A CFD Model evaluation study. J Loss Prev Process Ind2020; 65: 104116.
3.
GarciaJMigoyaELanaJA, et al. Study of the dispersion of natural gas issuing from compressor stations through silencers with upper cover. J Hazard Mater2008; 152: 1060–1072.
4.
QianJYLiXJGaoZX, et al. A numerical study of hydrogen leakage and diffusion in a hydrogen refueling station. Int J Hydrogen Energy2020; 28: 14428–14439.
5.
DasgotraATejaGSharmaA, et al. CFD modeling of large-scale flammable cloud dispersion using FLACS. J Loss Prev Process Ind2018; 56: 531–536.
6.
BernatikAZimmermanWPittM, et al. Modelling accidental releases of dangerous gases into the lower troposphere from mobile sources. Process Saf Environ Prot2008; 86: 198–207.
7.
XuALiHXFengGH. Numerical simulation analysis of temperature and pollutant concentration diffusion in the open kitchen cooking area. Procedia Eng2017; 205: 1165–1172.
8.
LiuXPPengZLiuXH, et al. Dispersion characteristics of hazardous gas and exposure risk assessment in a multiroom building environment. Int J Environ Res Public Health2020; 17: 1–18.
9.
WangCHLiJLTangZS, et al. Flame propagation in methane-air mixtures with transverse concentration gradients in horizontal duct. Fuel2020; 265: 1–7.
10.
LiuQMZhangYMNiuF, et al. Study on the flame propagation and gas explosion in propane/air mixtures. Fuel2015; 140: 677–684.
11.
BoeckLRHasslbergerJSattelmayerT. Flame acceleration in hydrogen/air mixtures with concentration gradient. Combust Sci Technol2014; 186: 1650–1661.
12.
BoulalSVidalPZitounR. Experimental investigation of detonation quenching in non-uniform compositions. Combust Flame2016; 172: 222–233.
13.
ShiYCWangNCuiJ, et al. Experimental and numerical investigation of charge shape effect on blast load induced by near-field explosions. Process Saf Environ Prot2022; 165: 266–277.
14.
LuoXJWangCJRuiSC, et al. Effects of ignition location, obstacles, and vent location on the vented hydrogen-air deflagrations with low vent burst pressure in a 20-foot container. Fuel2020; 280: 1–8.
15.
SuBLuoZMWangT, et al. Experimental and numerical evaluations on characteristics of vented methane explosion. J Cent South Univ2020; 27: 2382–2393.
16.
SommerselOKVaagsaetherKBjerketvedtD. Hydrogen explosions in 20′ ISO container. Int J Hydrogen Energy2016; 42: 7740–7748.
17.
LiCQiaoZHaoM, et al. Effect of ignition energy on environmental parameters of gas explosion in semi-closed pipeline. ACS Omega2022; 7: 10394–10405.
18.
WangXMTanYFZhangTT, et al. Diffusion process simulation and ventilation strategy for small-hole natural gas leakage in utility tunnels. Tunn Undergr Space Technol2020; 97: 1–17.
19.
AzadboniRKWenJXHeidariA, et al. Numerical modeling of deflagration to detonation transition in inhomogeneous hydrogen/air mixtures. J Loss Prev Process Ind2017; 49: 722–730.
20.
AzadboniRKHeidariABoeckL, et al. The effect of concentration gradients on deflagration-to-detonation transition in a rectangular channel with and without obstructions–a numerical study. Int J Hydrogen Energy2019; 44: 7032–7040.
21.
FletcherD. The future of Computational Fluid Dynamics (CFD) simulation in the chemical process industries. Chem Eng Res Des2022; 187: 299–305.
22.
SohrabZNimaRAliL. Applications of hybrid models in chemical, petroleum, and energy systems: a systematic review. Appl Energy2018; 228: 2539–2566.
23.
AvarganiVMZendehboudiS. CFD modeling and performance evaluation of an open-aperture partially evacuated receiver with internal twisted inserts in solar PTCs: energy and exergy analysis. Environ Sci Pollut Res Int2023; 30: 43346–43368.
24.
ShenRQJiaoZRParkerT, et al. Recent application of Computational Fluid Dynamics (CFD) in process safety and loss prevention: a review. J Loss Prev Process Ind2020; 67: 1–22.
25.
WangDQianXMYuanMQ, et al. Numerical simulation analysis of explosion process and destructive effect by gas explosion accident in buildings. J Loss Prev Process Ind2017; 49: 215–227.
26.
Yet-PoleIChengTL. Application of CFD model in an LPG tank explosion accident. J Loss Prev Process Ind2020; 69: 1–13.
27.
MishraSMishraKB. Numerical study of large-scale LNG vapour cloud explosion in an unconfined space. Process Saf Environ Prot2021; 149: 967–976.
28.
SongBJiaoWLCenK, et al. Quantitative risk assessment of gas leakage and explosion accident consequences inside residential buildings. Eng Fail Anal2021; 122: 1–15.
29.
CenKSongBJiaoWL, et al. Quantitative risk assessment of gas leakage and explosion accidents and its security measures in open kitchens. Eng Fail Anal2021; 130: 1–19.
30.
WangKShiTTHeYR, et al. Case analysis and CFD numerical study on gas explosion and damage processing caused by aging urban subsurface pipeline failures. Eng Fail Anal2019; 97: 201–219.
31.
GaoKLiSHanR, et al. Study on the propagation law of gas explosion in the space based on the goaf characteristic of coal mine. Saf Sci2020; 127: 104693.
32.
YangALiuYGaoK, et al. Numerical simulation of gas explosion with non-uniform concentration distribution by using OpenFOAM. ACS Omega2023; 8: 48798–48812.
33.
ZhangQTZhouGHuYY, et al. Risk evaluation and analysis of a gas tank explosion based on a vapor cloud explosion model: a case study. Eng Fail Anal2019; 101: 22–35.
34.
JiTXQianXMYuanMQ, et al. Case study of a natural gas explosion in Beijing, China. J Loss Prev Process Ind2017; 49: 401–410.
35.
CenKSongBShenRQ, et al. Dynamic characteristics of gas explosion and its mitigation measures inside residential buildings. Math Probl Eng2019; 2019: 1–15.
36.
JiaoWLSongBCenK, et al. Experimental and numerical study on explosion characteristics and hazards of methane-air mixtures in a chamber. Energy Source Part Recovery Util Environ Eff. Epub ahead of print 2021. DOI: 10.1080/15567036.2021.2008061.
China Architecture & Building Press. GB 50028 code for design of city gas engineering. Beijing, China: China Architecture & Building Press, 2020.
39.
China Architecture & Building Press. CJ/T 197 stainless steel corrugated tubes for the connection of gas appliances. Beijing, China: China Architecture & Building Press, 2010.
40.
WengHLiZBianJ, et al. Leakage and explosion hazard analysis of LNG receiving station. Natur Gas Oil2016; 34: 46–50.
41.
BaoQFangQZhangYD, et al. Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane–air mixtures. Fuel2016; 75: 40–48.
