Research progress on multi-overpressure peak structures of vented gas explosions in confined spaces

Yang, Kai; Hu, Qianran; Sun, Siheng; Lv, Pengfei; Pang, Lei

doi:10.1016/j.jlp.2019.103969

Cited by 42 publications

(6 citation statements)

References 49 publications

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“…At 210 ms, the opening of the vent causes the methane/air mixture near the vent to be quickly released under the pressure difference between the indoor and outdoor (peak P b formation) [25], and the corresponding mass flow suddenly rises and reaches a peak. At the same time, the overpressure oscillation peak P hel caused by the Helmholtz effect is formed with the opening of the vent [26]. At 262 ms, as the flame front expands, the rate of combustion product generation increases, causing the mass flow to increase again.…”

Section: Characteristics Of Overpressure Formation and Flamementioning

confidence: 99%

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Pang

Jin

et al. 2021

Advances in Civil Engineering

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The process of gas explosion venting in a typical Chinese civil kitchen was investigated using computational fluid dynamics technology, focusing on the impact of the scale and cross-sectional characteristics of congestion, such as common furniture and electrical appliances, on the explosion flow-field parameters. An asymmetrical distribution of congestion will cause the uneven combustion of explosion flames in the kitchen. The flame will initially spread on one side of the room and then accelerate toward the surrounding areas, thereby increasing the risk of indoor gas explosion. The typical indoor overpressure change process can be divided into five stages, among which Stage V is found to be related to pseudoclosed combustion. Large-scale congestion has an obstructive effect on the explosion flow field, but it changes under certain conditions, while small-scale congestion only acts as a promoter. The flat congestion cross section helps maintain the stability of the flame structure, whereas the continuous and abrupt change of the congestion cross section can induce strong turbulent combustion. The research results provide a theoretical basis for the prevention and control of natural gas explosion hazards in civil kitchens from the perspective of congestion scale and cross-sectional mutation.

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Section: Characteristics Of Overpressure Formation and Flamementioning

confidence: 99%

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Pang

Jin

et al. 2021

Advances in Civil Engineering

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“…The bimodal overpressure trend appears for (a) θ = 0.21, (b) θ = 0.25, and (c) θ = 0.29. The definitions of P b , P mfa , and P ext follow those presented by Yang et al (i.e., P b is the bursting pressure, P mfa occurs when the maximum flame area is achieved, and P ext occurs as a result of an external explosion) . As shown in Figure a, where μ = 0.23, P b is caused by the rupture of the PVC film at the open end.…”

Section: Results and Discusssionmentioning

confidence: 95%

“…The definitions of P b , P mfa , and P ext follow those presented by Yang et al (i.e., P b is the bursting pressure, P mfa occurs when the maximum flame area is achieved, and P ext occurs as a result of an external explosion). 47 As shown in Figure 9a, where μ = 0.23, P b is caused by the rupture of the PVC film at the open end. A large amount of unburnt gas is released and the volume expansion rate of initial combustion is much smaller than the rate of the gas escape, resulting in an instantaneous pressure drop.…”

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confidence: 99%

Effect of Propane Addition and Oxygen Enrichment on the Flame Characteristics of Biogas

et al. 2021

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Mixing biogas with other fuels or increasing the oxygen fraction in the oxidizer can improve the combustion performance of biogas. In this study, we investigated the effects of propane addition and oxygen enrichment on the flame characteristics of biogas with a constant heating value in a half-open duct. The evolution of the flame structure revealed that the tulip structure took on two types of patterns at the oxygen fraction θ = 0.21. However, there was no salient tulip flame formation when θ > 0.21. Oxygen enrichment significantly increased the flame propagation velocity (V) and explosion pressure (P). Propane addition significantly reduced V max at θ = 0.25 and 0.29. The maximum rate of pressure rise [(dP/dt)max] exhibited a nonlinear dependence on the maximum flame velocity (V max). A similar trend was observed for the dependence of (dP/dt)max on the laminar burning velocity (LBV). Therefore, the LBV is an important parameter to predict V max and (dP/dt)max values of mixtures. Furthermore, by using the PREMIX code and the UC San Diego mechanism, we simulated laminar flame burning properties to reveal the macroscopic flame propagation characteristics. The rate of propane consumption was higher than the rate of methane consumption. Additionally, oxygen enrichment played an important role in the entire reaction process, leading to an increase in the molar concentrations of microscopic free radicals and a promotion of the rates of production (ROP) of free radicals. In contrast, the addition of propane decreased the molar concentrations of microscopic free radicals and inhibited the ROP of free radicals.

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“…With the development of chemical industry parks (chemical clusters), the tank area, as an important area for the storage and transportation of chemical raw materials, intermediates and finished products, has shown a trend in recent years of having large-scale tanks and diversified storage types [ 1 ]. As the process pipelines in the tank area are various and complex, and most of the storage media are hazardous chemicals with flammable and explosive characteristics, once leakage occurs, fire and explosion accidents are likely to occur [ 2 , 3 , 4 ]. The thermal radiation [ 5 , 6 ], explosion overpressure [ 7 , 8 ] and explosion debris [ 9 ] generated by these initial events, as well as the interaction between them, often lead to cascading domino accidents, causing serious casualties and property losses [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Probability and Quantitative Risk Calculation Method of Domino Accident in Pool Fire in Chemical Storage Tank Area

Meng

Wei

Zhou

et al. 2022

IJERPH

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The domino event caused by fire is one of the common accidents in hydrocarbon storage tank farms, which further expands the severity and scope of the accident. Due to the different failure sequence of the storage tanks in a domino accident, the radiant heat generated by the failed storage tank to the target tank is different. Based on the influence of this synergistic effect, this study combined the Monte Carlo algorithm and FSEM, and proposed a fast real-time probability calculation method for a fire domino accident in a storage tank area, for the first time. This method uses the Monte Carlo algorithm to simulate all accident scenarios, and obtains the evolution of multiple escalation fire domino accidents under the synergistic effect according to FSEM, and then calculates the real-time failure probability and risk. Based on a comprehensive analysis of the accident propagation path, this method avoids the problem of a large amount of calculation, and is conducive to the rapid and effective analysis of the fire risk in a storage tank area and the formulation of corresponding risk reduction measures. The effectiveness and superiority of the proposed method were proved by a case study.

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Research progress on multi-overpressure peak structures of vented gas explosions in confined spaces

Cited by 42 publications

References 49 publications

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Effect of Congestion on Flow Field of Vented Natural Gas Explosion in a Kitchen

Effect of Propane Addition and Oxygen Enrichment on the Flame Characteristics of Biogas

Study on Dynamic Probability and Quantitative Risk Calculation Method of Domino Accident in Pool Fire in Chemical Storage Tank Area

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