Numerical Simulation of Leakage and Diffusion in Hydrogen Mixed Natural Gas Transmission Station

doi:10.11885/j.issn.1674-5086.2020.09.24.03

Abstract

Abstract: Mixing hydrogen into the natural gas pipeline network is currently the most effective way to achieve large-scale hydrogen transportation in the world. The explosion limit of hydrogen is 4.0%~75.6%, the upper and lower limits are wide, and the molecular diameter is smaller than that of methane, which brings great hidden dangers to gas transmission stations. Hydrogen mixed natural gas is the leakage of multi-component system. Based on the modified binary diffusion coefficient and thermodynamic factor calculation method, the Fick diffusion coefficient matrix of three-component system of hydrogen mixed natural gas is calculated, it is used to describe the mass transfer process of molecular motion among components in natural gas mixed with hydrogen. CFD numerical simulation analysis is carried out on the platform of fluent. The results show that the accumulation mode of hydrogen mixed natural gas after leakage is similar to that of natural gas, and its diffusion is affected by obstacles and wind speed; when the same volume of hydrogen mixed natural gas and non hydrogen natural gas leak, the lower explosion limit diffusion radius of hydrogen mixed natural gas is smaller; after the leakage of natural gas with low hydrogen content, the explosion area of hydrogen component is only near the leakage point. The research results can provide early warning and protection guidance for the leakage and diffusion of hydrogen mixed natural gas in the station.

Key words: hydrogen mixed natural gas, multicomponent system, gas transmission station, Fick diffusion matrix, numerical simulation

CLC Number:

TE88

YU Jin, ZHANG Hao, JIA Wenlong, XIE Ping, LI Changjun. Numerical Simulation of Leakage and Diffusion in Hydrogen Mixed Natural Gas Transmission Station[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(6): 153-161.

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