摘要
为系统分析天然气管道小孔泄漏后气体扩散规律,通过应用非稳态多孔介质大涡模型开展数值仿真,分析不同因素对管道泄漏的影响。研究结果表明:对于含硫天然气埋地管道,CH_(4)和H_(2)S随时间变化曲线形态接近;由于土壤的阻力作用较大,气体扩散区域近似成球形,速度的衰减近似与扩散直径的3次方呈反比;在≥1 m的埋深范围内,天然气泄漏质量流量基本不变;埋地天然气泄漏的质量流量随着泄漏压力和泄漏孔径的增加而增大,与泄漏压力呈线性关系,与泄漏孔直径呈2次方关系;对于大尺寸埋地管道,泄漏口的位置会明显影响CH_(4)在土壤中的分布。研究结果可为含硫天然气埋地管道设计及其事故调查提供参考。
In order to systematically analyze the gas diffusion law after the small hole leakage of natural gas pipeline,the numerical simulation was conducted by applying the unsteady porous medium large eddy model to analyze the influence of different factors on pipeline leakage.The results show that for the buried pipeline of natural gas containing H_(2)S,the shape of CH_(4) and H_(2)S time-varying curves is similar.Due to the large resistance of soil,the gas diffusion area is approximately spherical,and the attenuation of velocity is approximately inversely proportional to the cubic power of diffusion diameter.Within the buried depth range of≥1 m,the mass flow rate of natural gas leakage is basically constant.The mass flow rate of buried natural gas leakage increases with the increase of leakage pressure and leakage hole diameter,which is linearly related to the leakage pressure and quadratically related to the leakage hole diameter.For large-sized buried pipeline,the location of leakage hole will significantly affect the distribution of CH_(4) in the soil.The research results can provide reference for the design and accident investigation of buried pipelines of natural gas containing H_(2)S.
作者
栾国华
刘长春
李鑫
梁涛
LUAN Guohua;LIU Changchun;LI Xin;LIANG Tao(CNPC Research Institute of Safety and Environment Technology,Beijing 102206,China;School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an Shaanxi 710054,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2024年第8期96-103,共8页
Journal of Safety Science and Technology
基金
国家重点研发计划项目(2021YFE0105000)。
关键词
天然气
埋地
泄漏
气体扩散
natural gas
buried
leakage
gas diffusion
