氢能作为一种零碳高效的能源载体和化工原料,是中国实现“双碳”目标和构建绿色低碳现代能源体系的重要支柱。在制约氢能产业化应用的诸多因素中,氢气的长距离输送是关键。依托现有成熟的天然气管道输送技术和健全的天然气管道基础设施,掺氢天然气管道输送有望实现远距离、大规模、低成本的氢能输运。首先综述了掺氢天然气管道输送技术的可行性、应用和示范项目；围绕掺氢天然气的分离提纯探讨了变压吸附、膜分离及变压吸附和膜分离耦合工艺的应用情况；最后基于川气东送管道估算出掺氢天然气输送、提纯氢的成本为14.89元/kg。相关研究可为掺氢天然气输送与纯化技术的发展提供了理论指导。

 Hydrogen, as a zero-carbon energy carrier and chemical raw material, plays a critical role for China to realize its peak carbon dioxide emissions, carbon neutrality goals (“dual carbon” goals) and develop a low-carbon, green modern energy system. Among the many factors constraining the industrial application of hydrogen energy, long-distance hydrogen transmission is a key challenge. Leveraging on existing mature natural gas pipeline transmission technology and well-established natural gas pipeline infrastructure, hydrogen-blended natural gas pipeline transmission holds promise for realizing long-distance, large-scale, and low-cost hydrogen transmission. This paper first provides an overview of the feasibility, application, and demonstration projects of hydrogen-blended natural gas technology. It then discusses the application of pressure swing adsorption, membrane separation, and their coupled processes for the separation and purification of hydrogen from blended natural gas. Finally, based on the Sichuan-to-Eastern China Gas Transmission Pipeline, the cost of transporting and purifying H2 is estimated to be 14.89 yuan/kg. This research provides theoretical guidance for the development of hydrogen-blended natural gas technologies.