摘要
为分析不同因素在埋地输气管道泄漏及扩散中的影响,基于组分运输模型和多孔介质模型,采用FLUENT软件建立埋地天然气管道的三维数值模型,分析管道内压、泄漏口孔径、管道埋深和地面硬化情况对埋地输气管道泄漏特性的影响。分析结果表明:随管道内压增大,泄漏口泄漏速率明显提升,在管道方向泄漏范围更远,在大气方向泄漏更为集中;泄漏口孔径越大,同等时间泄漏量增大明显,泄漏口附近高浓度区域增大,且到达边界时间更短;随泄漏管段埋深增加,泄漏甲烷更晚到达地面,扩散范围更广,大气中甲烷含量更低;硬化地面宽度越大,地面对泄漏甲烷的阻碍区域增大,泄漏甲烷大部分聚集在土壤中,同时地面甲烷浓度和地面预警区域直径变小;不同因素对埋地输气管道泄漏后危险区域的影响权重为:管道埋深>硬化宽度>泄漏孔径>管道内压。
In order to analyze the influence of different factors on the leakage and diffusion of the buried gas pipeline,the three-dimensional numerical model of the buried gas pipeline was established by using the software FLUENT based on the component transport model and the porous media model,and the influence of the internal pressure of the pipeline,the aperture of the leak port,the buried depth of the pipeline and the hardening of the ground on the leakage characteristics of the buried gas pipeline was analyzed.The results show that with the increase of the internal pressure of the pipeline,the leakage rate of the leakage port increases obviously,the leakage range in the pipeline direction is further,and the leakage in the atmosphere direction is more concentrated.The larger the aperture of the leakage port is,the greater the leakage amount in the same time,the larger the high concentration area near the leakage port,and the shorter the time to reach the boundary.With the increase of the buried depth of the leakage pipe section,the leakage methane reaches the surface later,the diffusion range is wider,and the methane content in the atmosphere is lower.The larger the width of hardened ground,the larger the obstacle area of methane leakage,most of the methane leakage in the soil,and the smaller the surface methane concentration and the diameter of the surface warning area.The influence weights of different factors on the dangerous area after the leakage of the buried gas pipeline are as follows:buried depth>hardening width>leakage aperture>internal pressure of the pipeline.
作者
范佳锐
汤历平
王锡军
王佳
孙莹
丁俊
FAN Jia-rui;TANG Li-ping;WANG Xi-jun;WANG Jia;SUN Ying;DING Jun(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Qinghai Oilfield Surface Gathering and Transmission Engineering Company,Dunhuang 736202,China)
出处
《科学技术与工程》
北大核心
2025年第25期10671-10679,共9页
Science Technology and Engineering
基金
全国总工会补助项目(2016-2901)。
关键词
埋地管道
泄漏
扩散
数值模拟
风险评估
buried pipeline
leak
diffusion
numerical simulation
risk assessment
