Objective This study aims to explore the gas leakage and diffusion laws of buried hydrogen-doped natural gas pipelines under the influence of porous media.Methods A simulation model for buried hydrogen-blended natural gas pipelines was established based on computational fluid dynamics(CFD)software,focusing on exploring the effects of soil properties,soil thickness,hydrogen blending ratio,leakage aperture,and pipeline pressure on gas diffusion processes.Results Different soil properties significantly affect the gas diffusion distribution(pure sand>pure loam>pure clay),and the gas diffusion velocity in the soil is inversely proportional to the soil coefficient.The thickness of soil cover is positively correlated with the time of the formation of the dangerous zones on the ground surface and negatively correlated with the diffusion area on the ground surface.In gathering and transportation,the increase of hydrogen blending ratio,leakage aperture,and pressure all lead to the formation of dangerous zones.Conclusions Soil properties would impact hydrogen-blended natural gas leakage diffusion prominently.It is essential to focus on exploring the diffusion patterns and dangerous zones of methane and hydrogen in sand soils.
hydrogen-blended natural gasporous medianumerical simulationinfluencing factorsdangerous zone
万方数据
维普
