Study on leakage and explosion law of buried gas pipeline based on scenario construction

Kang, Yong; Ma, Shuye; Zhao, Mengmeng; Wu, Zhuang; Xia, Xiaoxue

doi:10.1007/s11356-023-27291-9

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Because of the advantages of using computer simulation technology and the findings of numerous experimental research, people began to utilize 2D and 3D models closer to the real gas to examine pipeline leakage and diffusion behavior [22][23][24][25][26]. Particularly for buried pipes, 3D modeling can account for the resistance of all 3D soil bodies, which is more accurate than 1D and 2D computational models [27]. For the widely encountered medium-pressure natural gas pipelines in cities, Ebrahimi-Moghadam et al [28] designed 2D and 3D models and numerically solved them using the finite volume approach to achieve high solution accuracy.…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation of Diffusion Law and Harmful Boundary of Buried Natural Gas Pipeline in the Mountainous Environment

Chen,

Zhao,

Zhang

et al. 2024

ENERGY

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The leakage gas from a buried natural gas pipelines has the great potential to cause economic losses and environmental pollution owing to the complexity of the mountainous environment. In this study, computational fluid dynamics (CFD) method was applied to investigate the diffusion law and hazard range of buried natural gas pipeline leakage in mountainous environment. Based on cloud chart, concentration at the monitoring site and hazard range of lower explosion limit (LEL) and upper explosion limit (UEL), the influences of leakage hole direction and shape, soil property, burial depth, obstacle type on the diffusion law and hazard range are analyzed. Results show that the leakage gas is not radially diffused until it reaches the ground, and the velocity of gas diffusion to the ground and the hazard range decrease as the angle between the leaking direction and the buoyancy direction increases. Triangular and square leak holes have a faster diffusion rate and a wider hazard range than circular. The diffusion rate of leakage gas in soil rises as soil granularity and porosity increase. The time of leakage gas diffusion to the ground increases significantly with the increase of burial depth, and the hazard range reduces as burial depth increases. Boulder-type obstacles will alter the diffusion path of the leakage gas and accelerate the expansion of the hazard distance, while trench-type obstacles will cause the natural gas to accumulate in the trench and form a high concentration region slowing the expansion of the surface gas concentration.

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