Experimental study on vented explosion overpressure of methane/air mixtures in manhole

Li, Pengliang; Huang, Pengcheng; Liu, Zhenyi; Du, Bingxuan; Li, Mingzhi

doi:10.1016/j.jhazmat.2019.04.046

Cited by 38 publications

(3 citation statements)

References 22 publications

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“…Problems such as aging gas pipelines, damaged valves, and irregular operation have led to the increased incidence of urban gas deflagration accidents, which pose a serious threat to building structures and personal safety [1]. In 2019, there were 463 indoor gas explosion accidents in China, 301 of which occurred in households, accounting for 65% of the total.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…With the rapid development of our country's urbanization and economy, the demand for natural gas has increased significantly. However, natural gas explosions occur frequently because of aging pipelines and inappropriate use of gas facilities, causing great loss of life and property to the people [1][2][3][4][5]. For example, on July 29, 2023, a gas explosion occurred in a street shop at Jinse Yangguang Community, Hongqi Street, Anping County, Hengshui City, Hebei Province, resulting in two deaths and two serious injuries.…”

Section: Introductionmentioning

confidence: 99%

Effect of Room Layout on Natural Gas Explosion in Kitchen

Yang,

Wu,

Chen

et al. 2024

Preprint

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In order to elucidate the overpressure and fire hazard effects of gas explosion in a congested room, the effects of gas concentration and room layout of gas explosion in a kitchen were studied by CFD. The results showed that the flow field parameters in a kitchen exhibited an initial increase followed by a decrease as the gas concentration increased. The maximum gas flow rate recorded within the chamber was 390 m/s, while the corresponding maximum flame propagation rate and peak pressure reached 289.86 m/s and 30.95 kPa, respectively. The difference in the flow field induced by the concentration is further enhanced by the presence of congested materials. Additionally, the room layout influenced the gas congestion’s blowout effect due to variations in turbulence intensity and flammable gas volume caused by significant changes in the congestion’s size within the room. Specifically, when gas concentration is 10%, the indoor gas flow rate and flame combustion rate are II > U > L > I, while the turbulent kinetic energy and explosive overpressure followed the order of I > II > L > U. The results are of great significance for the disaster assessment and accident prevention of natural gas explosion in civil kitchens.

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“…It can be seen that the safety of natural gas use by residents in China cannot be ignored. Therefore, revealing the reaction mechanism of natural gas combustion, determining the law of natural gas leakage and diffusion, and mastering explosion hazards contribute to safe use of gas. − …”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Cai

Liu

et al. 2022

ACS Omega

Self Cite

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Frequent occurrence of indoor natural gas explosion accidents seriously threatens the safety of people and property. To determine the law of indoor natural gas leakage and explosion hazards, based on experiment and simulation, the nature of natural gas explosion, the distribution law of natural gas volume fraction, flame propagation, temperature, and shock wave overpressure were studied. The results show that the flame structure can be divided into three zones, i.e., preheat zone, reaction zone, and product zone. OH + CO ⇔ H + CO 2 is the main exothermic reaction in the combustion process. The overall distribution law of natural gas volume fraction shows that the higher the position, the greater the volume fraction, and the closer the distance to the leak source at the same height, the greater the volume fraction, and the natural gas volume fraction of the hose falling off is the largest under different leakage conditions. The difference in the wrapping structure of the kitchen package has a significant impact on the diffusion distribution of natural gas. The flame development goes through five stages of ignition, slow burning, detonation, slow burning, and extinguishing. The indoor temperature reaches about 1400 °C. Although the simulated value of shock wave overpressure is larger than the experimental value, the relationship between overpressure and distance is expressed by Y = A + B * ln( X + C ). This study can provide certain technical support for natural gas accident rescue. The research can provide certain technical support for natural gas accident rescue and can also be used for accident investigation to form the determination procedure and method of leakage location and leakage amount.

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Experimental study on vented explosion overpressure of methane/air mixtures in manhole

Cited by 38 publications

References 22 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 Room Layout on Natural Gas Explosion in Kitchen

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

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