氢能是一种零碳排、应用形式多样的清洁能源,有望成为推动中国能源转型的重要力量。天然气管道掺氢输送可以充分利用现有天然气管网设施,解决弃电消纳难题,促进低碳经济发展。系统总结了国内外关于天然气管道掺氢输送的研究进展,阐述了掺氢输送的可行性和面临的主要挑战。研究表明:掺氢后,混输气的华白数和燃烧势均降低,当掺氢比低于20%左右时,可以满足民用终端的燃气要求;氢脆发生的几率随着管材等级的提升而增大,中低压天然气管网更适于开展掺氢输送;离心式压缩机的做功部件与氢气直接接触,更易产生氢腐蚀,与管网的联合工作区间变窄,容易出现喘振现象,可以通过提高管网运行压力确保工况稳定。现阶段国内外在天然气管道掺氢输送领域的规范尚属空白,相关项目多参照纯氢管道或天然气管道设计规范进行。利用已有天然气管网进行掺氢输送的前景广阔,建议深入开展氢能技术的应用示范,加快出台相关专业标准与规范,促进氢能产业的稳步发展。

Hydrogen energy is a kind of clean energy with zero carbon emission and various applications, which is expected to become an important driving force in promoting China’s energy transformation. Pipeline transportation of hydrogen-blended natural gas can make full use of existing natural gas pipeline network facilities, solve the problem of wastage of surplus renewable energy that is above the power demand, and promote the development of low-carbon economy. In this paper, the research progress of the pipeline transportation of hydrogen-blended natural gas at home and abroad was systematically summarized, and the feasibility and main challenges expounded as well. The research shows that after blending with hydrogen, the Wobbe index and combustion potential of the mixed gas decrease. When the hydrogen-blended ratio is less than 20 %, the gas requirements of domestic consumers can be satisfied. The probability of hydrogen embrittlement increases with the increase of pipe grade, and the medium-low pressure natural gas pipeline network is more suitable for hydrogen-blended gas transportation. The working components of the centrifugal compressor are in direct contact with hydrogen, and are therefore more susceptible to hydrogen corrosion. Compressor surge is prone to occur as the combined working range with the pipeline network is narrowed. The operating conditions can be stabilized by increasing the operating pressure of the pipeline network. At present, there is still a gap in domestic and foreign regulations for pipeline transportation of hydrogen-blended natural gas, and the related projects are mostly carried out according to the design specifications of pure hydrogen pipelines or natural gas pipelines. Hydrogen-blended gas transportation using existing natural gas pipeline network enjoys a promising future. It is suggested to carry out in-depth technical application demonstration and speed up the introduction of relevant professional norms to promote the steady development of hydrogen energy industry.