Experimental study on the diffusion process of natural gas from buried pipelines to underground confined spaces

IF 4.2 3区 工程技术 Q2 ENERGY & FUELS
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Abstract

In recent years, leakage from buried gas pipelines has been a frequent occurrence around the world. Leaked gas can quickly diffuse and accumulate in adjacent confined spaces, such as inspection wells, sewage pipes, and heat pipeline trenches, posing serious threats to people's lives and property in the event of fire. In this study, a large-scale experimental system was conducted to better understand how methane diffuses after an unintended leak from an underground pipe and how long the methane may take to dissipate in the soil and the adjacent underground confined space. A theoretical analysis is conducted of the seepage characteristics of methane gas in soil, and the experimental results indicate that the variation of methane concentration over time in soil and underground confined spaces is directly related to the distance between the test points and the leak holes. With an escalation in the gas flow rate, methane concentration progressively elevates within the same leakage time, demonstrating a decreasing augmentation rate. Once the air source has been cut off, the gas concentration in the underground confined space will maintain a stable state for a period time after reaching the peak value. Additionally, the time required to reach the lower and upper limits of dangerous concentration has an exponential relationship with the diffusion distance. Fitting curve equations have been drawn in all experimental scenarios.
天然气从埋地管道向地下密闭空间扩散过程的实验研究
近年来,世界各地频繁发生埋地燃气管道泄漏事故。泄漏的气体会迅速扩散并积聚在邻近的密闭空间,如检查井、污水管道和热力管道沟槽等,一旦发生火灾,将对人们的生命和财产造成严重威胁。在这项研究中,为了更好地了解甲烷在地下管道意外泄漏后是如何扩散的,以及甲烷在土壤和相邻地下密闭空间中消散可能需要多长时间,我们进行了大规模的实验系统。对甲烷气体在土壤中的渗流特性进行了理论分析,实验结果表明,土壤和地下密闭空间中甲烷浓度随时间的变化与测试点和泄漏孔之间的距离直接相关。随着气体流速的增加,在相同的泄漏时间内,甲烷浓度逐渐升高,呈现出递减的增加率。一旦气源被切断,地下密闭空间内的气体浓度在达到峰值后将在一段时间内保持稳定状态。此外,达到危险浓度下限和上限所需的时间与扩散距离呈指数关系。在所有实验方案中都绘制了拟合曲线方程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Natural Gas Industry B
Natural Gas Industry B Earth and Planetary Sciences-Geology
CiteScore
5.80
自引率
6.10%
发文量
46
审稿时长
79 days
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