Abstract
Due to non-pollution and high combustion efficiency, hydrogen energy is promising as a clean and renewable energy source to gradually replace fossil fuels and reduce carbon emissions. However, the low-cost, large-scale and long-distance transportation of hydrogen has always been a problem perplexing the development of hydrogen energy. Mixing hydrogen with natural gas and transporting it in natural gas pipeline is an effective solution to this problem. In this paper, the structural integrity of hydrogen-mixed natural gas pipelines under extreme loads are studied. Firstly, a mechanical model of hydrogen-mixed natural gas pipeline was established. Secondly, a new multi-parameter failure criterion containing the ratio of yield and tensile strength (Y/T) is provided. Thirdly, based on the multi-parameter failure criterion, a novel burst pressure equation of the hydrogen-mixed natural gas pipelines is presented. Fourthly, the accuracy of the burst pressure equation is verified by experiment and finite element method. The results show that the new multi-parameter failure criterion can be used to accurately predict the burst pressure of hydrogen-mixed natural gas pipelines with high accuracy. Our research has important theoretical significance and application value for the development of classical strength theory and the integrity assessment of mixed hydrogen natural gas pipeline.
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