Flow characteristics and leakage rate calculations of microchannels in hydrogen-blended natural gas sealing structures

Le résumé fourni par la source

Hydrogen energy plays a key role in achieving China's "double carbon" goal. Blending hydrogen with natural gas and transporting it through existing pipeline infrastructure offers a practical solution for large-scale hydrogen delivery. However, gasket-related sealing failures remain the leading cause of leakage in such systems. This study investigates the sealing mechanism and establishes a predictive model for calculating the leakage rate. The diffusion behavior between multicomponent systems of hydrogen-blended natural gas significantly complicates flow characterizationwithin sealing interfaces contact. To address this, this paper used a high fractal rough surface profile to create a sealing fluid domain model at a microscopic scale. It combined a multicomponent gas diffusion model and a numerical hydrodynamic computation method to examine the flow characteristics of the sealing gap on the sealing surface of the flange. Additionally, it predicted the leakage rate at various hydrogen blending ratios. The results show that throttling and friction effects within the sealing gap intensify as the pressure differential increases, significantly boosting the leakage rate, which rapidly increased the leakage rate with higher pressure differences between the inlet and outlet. Compared to other substances, hydrogen demonstrated the lowest mass leakage rate and the highest average velocity under identical pressure conditions.

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