Research Progress on Compressed Air Energy Storage and Hydrogen Energy Coupling Systems

ObjectivesCompressed air energy storage-hydrogen energy (CAES-HE) coupling systems show prominent advantages in the fields of low-carbon energy transition, the construction of new-type power systems, large-scale peak shaving of the power grid, and large-scale hydrogen consumption. To clarify the current research status of the CAES-HE coupling systems, identify the key scientific and technological issues that need to be addressed, and outline future development directions, a review of relevant studies in this field is conducted.MethodsThe technical routes and characteristics of different CAES-HE coupling systems are analyzed. The key scientific and technological issues that need to be addressed in different coupling systems, along with their current research status, are summarized. On this basis, the future development directions of CAES-HE coupling systems are discussed.ResultsCurrently, four types of CAES-HE coupling systems with different technical routes and characteristics have been proposed. To promote the large-scale development of different CAES-HE coupling systems, research and breakthroughs are still needed in areas including the development of new coupling processes, key common technologies for hydrogen production and storage, hydrogen gas turbine technology, methanation reaction mechanisms, and reactor optimization.ConclusionsCAES-HE coupling systems are one of the most promising development directions in the future, and promoting their large-scale deployment and engineering implementation requires in-depth research and collaborative efforts across multiple disciplines and fields.