【Ten Years of Great Progress in Chemical Engineering Technology】Research on Key Technologies for Hydrogen Pipeline Systems from 2022 to 2023 Successfully Completed
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Ten years of rapid development in chemical engineering technology; praise for the prosperous and strong China. This is just a starting point to encourage more people to get involved, making things even more lively. HaiChuan becomes even better with your participation – we welcome everyone to join in the forum discussions. The fragrance of rice flowers in August: On August 17, 2023, the research project titled “Research on Key Technologies for Hydrogen-Containing Gas Pipeline Systems,” undertaken by the Southwest Branch of China National Petroleum Engineering Corporation, was approved by China National Petroleum Engineering Corporation (abbreviated as CNPEC). This project was initiated to address the production needs related to hydrogen injection and hydrogen-blended transportation in oil fields such as the Tarim Oil Field and the Changqing Oil Field. After three years of effort, the system has resolved the key technical challenges associated with hydrogen-containing pipeline transportation systems, developing a number of core technologies including \"pipeline transportation technology for hydrogen-blended natural gas/pure hydrogen,\" \"quantitative analysis technology for the potential impact radius of hydrogen-containing pipelines,\" \"analysis technology for the venting of hydrogen-blended natural gas,\" \"natural gas hydrogen blending process technology,\" and \"material compatibility assessment technology in hydrogen-rich environments.\"
Innovative aspects of this research: (1) Based on the physical properties of the hydrogen-natural gas mixture and the density differences between hydrogen and natural gas, it was determined that hydrogen concentration could accumulate during pipeline shutdowns. A time-domain-based simulation method for predicting such concentration accumulations in hydrogen-natural gas mixtures was developed, resulting in a prediction technique for hydrogen accumulation concentrations in mixed gas systems that can be used to guide engineering design. (2) The natural gas and hydrogen blending process is carried out using high-precision static mixers, which ensure effective and uniform mixing of the two gases; the volume fraction error of each individual gas after blending is kept within the range of ±1.5% ； (3) Based on the quasi-static fracture toughness testing method for metal materials, acceptance criteria for the fracture toughness characteristic values KQ and CTOD of X52, X70, and X80 steel pipes as well as their circumferential welds in a hydrogen environment were proposed. The research findings of this project have been applied to Zhejiang Energy Group’s \"Research on Hydrogen Blending, Storage, Transportation, and Terminal Separation in Natural Gas Pipeline Systems: A Pilot Demonstration Project,\" as well as in the development of industry standards such as the \"Design Code for Hydrogen Pipelines\" and the \"Design Code for Hydrogen Transportation Pipeline Projects.\"