Analysis of gas diffusion law after small hole leakage of buried natural gas pipeline
In order to systematically analyze the gas diffusion law after the small hole leakage of natural gas pipeline,the nu-merical simulation was conducted by applying the unsteady porous medium large eddy model to analyze the influence of differ-ent factors on pipeline leakage.The results show that for the buried pipeline of natural gas containing H2 S,the shape of CH4 and H2 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 bur-ied 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 CH4 in the soil.The research results can provide reference for the design and acci-dent investigation of buried pipelines of natural gas containing H2 S.
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