Experimental study on the effect of explosion suppression in low-concentration gas transportation

Li, Runzhi; Rong-jun, SI; Gao, Ke; Qin, Xinxin; Wen, Liangxiu

doi:10.1016/j.jlp.2018.04.005

Cited by 16 publications

(7 citation statements)

References 12 publications

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“…In this work, the peak of measured explosion pressure is relatively large. As the explosion propagates to the outlet of the pipeline, the explosion pressure gradually decreases, and then the explosion pressure rises again due to the self‐acceleration of the explosion process . If another end of the pipeline is completely open, then the explosion pressure gradually decreases along with the increase of propagation distance.…”

Section: Resultsmentioning

confidence: 99%

“…This depends on the time difference between the flame reaching the two adjacent sensors and the distance between the two adjacent sensors. The average speed of flame propagation is obtained with the help of Formula (3)

V = \frac{L}{T_{2} - T_{1}}

where, V —flame propagation velocity, m/s; L —the distance between two adjacent flame sensors, m; T 1 , T 2 —the time for the flame front to reach the first and second adjacent flame sensors, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Experimental study of low‐concentration gas explosion in large‐scale pipeline

Zhang

Liu

et al. 2020

Energy Science & Engineering

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Low‐concentration gas is one of the most realistic and reliable supplementary or alternative energy sources of conventional natural gas, which has a wide range of applications. However, this gas is flammable and explosive during pipeline transportation and easily causes an explosion. In order to achieve safe transmission, the explosion characteristics and propagation law of low‐concentration gas are systematically studied through a large‐scale pipeline experimental system. We found that the peak pressure of low‐concentration gas explosion in pipeline has a quadratic function relationship with the propagation distance. Moreover, the peak pressure of gas explosion initially decreases from the explosion source, and then a turning point appears after a certain distance of propagation, which is followed by a sharp increase of peak pressure of gas explosion. The explosion pressure becomes maximum at the outlets of a pipeline. The arrival time of explosion flame is logarithmically relevant to propagation distance, while the speed of flame propagation gradually increases along with the increase of propagation distance. The flame propagation is faster at the exit point. In addition, the diameter of pipeline has also an important influence on the explosion propagation process of low‐concentration gas. So, the larger the diameter, the higher the explosion pressure. The explosion pressure of DN700 pipeline is obviously higher than that of DN500, and the explosion pressure rises faster; the speed of flame propagation of gas explosion in DN700 pipeline is also higher than that in DN500 pipeline. This study provides a theoretical reference for the prevention and control of explosion accidents in low‐concentration gas pipelines.

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Section: Resultsmentioning

confidence: 99%

V = \frac{L}{T_{2} - T_{1}}

Section: Resultsmentioning

confidence: 99%

Experimental study of low‐concentration gas explosion in large‐scale pipeline

Zhang

Liu

et al. 2020

Energy Science & Engineering

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“…As the most likely location of gas emission occurs underground, the study of gas explosion characteristics and explosion venting measures is the focus of coal mine safety production. 8−12 Scholars worldwide have conducted theoretical analyses, 13 numerical simulations, 14−16 and experimental tests; 17,18 other means of gas explosion mechanism characteristics, propagation law, and the status of explosion venting research are also deepening. Dorofeev 19 briefly introduced the acceleration of flames and applied the flame acceleration mechanism to the explosion process.…”

Section: ■ Introductionmentioning

confidence: 99%

Study on Gas Explosion Propagation Law and Explosion Venting in an Excavation Roadway

Gao

Yang

et al. 2023

ACS Omega

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Gas explosions are the biggest threat to coal mine safety, which often result in sudden massive destruction. When a gas explosion occurs in a mine, it often causes a large number of casualties and property losses, which significantly restricts the development of the coal industry. In this study, a numerical model was established for the excavation and main roadways under the condition of a forward blasting chamber and a blasting wall, and the law of overpressure propagation and the flame temperature were studied. The results show that the overpressure curve first increases and then decreases with time, exhibiting a fluctuating state, and finally tends to stabilize. The overpressure curve with an explosion venting chamber and explosion venting wall oscillates many times; compared with the roadway overpressure reduced by 10% and explosive impulse reduced by 8.5%, the explosion venting chamber and explosion venting wall have a certain explosion venting effect. The flame temperature exhibits a gradual increase in the early stage, a sharp increase in the temperature at the measuring point, a fluctuation in the temperature curve in the later stage, and a significant decrease after the roadway turns. The explosion venting chamber and explosion venting wall with different explosion venting pressures have a slight effect on the temperature of each measuring point in the roadway after a gas explosion.

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“…e simulation results were consistent with the actual accident damage, and the location of ignition source was further determined. In addition, many studies have been carried out on the inhibitory mechanism of gas explosion [23,24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Pipeline‐Pavement Damage Caused by Explosion of Leakage Gas in Buried PE Pipelines

Zhou

Zhenzhen

et al. 2020

Advances in Civil Engineering

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In order to investigate the damage influence of the leakage explosion in urban gas pipeline on the surrounding environment, the numerical models of buried PE (polyethylene) pipes under urban pavement were established by using ANSYS/LS-DYNA in this study. The reliability of the numerical models was verified on the basis of the explosion experiments. According to the amount of gas leakage, the TNT explosive equivalent was determined. The gas leakage explosion process of buried PE pipes was studied, and the pressure and stress changes of pipes and pavements under different explosive equivalents and buried depths were analyzed; at last, the deformation law of pipes and pavements were discussed. The results show that the PE pipes are fractured during the leakage explosion and a spherical explosion cavity is formed in the soil. The pavement above the explosion point bulges upward and forms a circle. The maximum pressure of pipe near the explosion point increases linearly with the increase of explosive equivalent, and a proportional relation is observed between the fracture width of pipe and the explosive equivalent. The degree and duration of pavement deformation increase significantly with the increase of explosive equivalents. The dynamic response of the pipes is rarely affected by the buried depth, and the change of maximum effective stress is no more than 7%. However, the buried depth is of great influence on the damage degree of pavement. When the buried depth increases from 0.9 m to 1.5 m, the pavement deformation can be reduced effectively. The variation rule of pavement deformation is similar to the change rule of maximum overpressure and effective plastic stress; they change in the form of concave functions with the increase of buried depth. The results can provide theoretical basis for municipal pipeline construction design and urban safety planning and provide references for the risk assessment of gas explosion in buried pipelines.

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Experimental study on the effect of explosion suppression in low-concentration gas transportation

Cited by 16 publications

References 12 publications

Experimental study of low‐concentration gas explosion in large‐scale pipeline

Experimental study of low‐concentration gas explosion in large‐scale pipeline

Study on Gas Explosion Propagation Law and Explosion Venting in an Excavation Roadway

Numerical Simulation of Pipeline‐Pavement Damage Caused by Explosion of Leakage Gas in Buried PE Pipelines

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