Simulation Study on the Influence of Hydrogen Blending Ratio on Natural Gas Pipeline Leakage and Diffusion
To study the influence of hydrogen mixing ratio on the leakage of natural gas pipelines,a mathematical model for the leakage and diffusion of directly buried high-pressure hydrogen mixed natural gas pipelines was established based on computational fluid dynamics theory and numerical simulation method.The leakage status,volume fraction distribution of hydrogen mixed gas,and the distribution of soil pressure and gas velocity around the pipeline were analyzed under different hydrogen mixing ratios.The results show that with the increase of hydrogen mixing ratio,the explosion radius of hydrogen mixed gas in the atmosphere will gradually decrease,and the range of high-pressure area around the pipeline will gradually decrease,and the gas flow rate at the leakage port will gradually increase.When the hydrogen mixing ratio is 30％,the explosion radius in the atmosphere is reduced by 43％,and the gas flow rate at the leakage port is increased by 68％.This provides a theoretical reference for the safety and emergency repair of hydrogen-doped natural gas pipelines and has important practical significance for promoting the large-scale application of hydrogen-doped natural gas.
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