Research status and analysis of hydrogen-blended natural gas transportation in natural gas pipelines
Hydrogen-blended natural gas transportation is one of the ways to achieve large-scale,long-distance and low-cost hydrogen transportation,but the blending of hydrogen into natural gas pipelines significantly affects the operation condition and safety maintenance of natural gas pipelines,posing potential safety risks.Therefore,based on the current domestic and foreign research and engineering applications status of hydrogen-blended natural gas transportation in recent years,the main factors affecting safe hydrogen-blended natural gas transportation in natural gas pipelines,including the change of natural gas physical properties caused by hydrogen blended,hydrogen-induced failures and uneven mixing,as well as the safety problems including leakage,diffusion and detonation were discussed.The analysis indicates that new requirements are put forward for the pipe materials with the hydrogen blended.Thus,relevant systematic experiments are needed to reveal the mechanism of hydrogen-induced failures.Whether gas stratification occurs after the shutdown of hydrogen-blended natural gas pipelines is closely related to whether the pipeline is hydrogen-induced failure.The safety range of diffused spontaneous combustion,the minimum hydrogen blending ratio and the mechanism of detonation are still unclear,and the gap between experiments and practice is significant.The establishment of standards and associated regulatory policies for hydrogen-blended natural gas pipelines is still in the development stage,so improvement is required based on the systematic research data and practical implementation.The above results clarify the risks related hydrogen-blended natural gas transportation and can provide reference for the promotion and practical operation of large-scale hydrogen-blended natural gas transportation projects.
hydrogen-blended natural gaspipeline transportationhydrogen blending ratioleakage and diffusiondetonation
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