Speaker
Description
To reduce carbon emissions, transitioning the energy system from traditional fossil fuels to clean energy sources is crucial. Hydrogen energy has emerged as a highly promising clean energy option, attracting increasing attention. However, one of the primary challenges hindering the development of hydrogen energy is its storage. Underground hydrogen storage (UHS) has become a vital technology for achieving large-scale, long-term hydrogen storage. Despite its potential, limited experience with UHS projects has left the mechanisms of hydrogen storage, transport, and leakage within reservoirs inadequately understood. This study investigates the storage and flow characteristics of hydrogen in UHS from nano-scale to micro-scale. At the nano-scale, molecular dynamics (MD) simulations are employed to examine the adsorption behavior of hydrogen. The effects of temperature, pressure, and pore size on hydrogen adsorption in narrow slits of clay minerals are analyzed. Key findings include the distribution characteristics of hydrogen in slits, the amount of excess adsorption, diffusion coefficients, and gas-solid interaction energies. At the micro-scale, digital rock and computational fluid dynamics (CFD) methods are utilized to explore hydrogen flow behavior. Factors such as wettability and the capillary number are analyzed for their effects on hydrogen storage and recovery efficiency during multiple hydrogen injection and recovery cycles. This study elucidates the mechanisms of hydrogen storage and transport from a microscopic perspective, offering valuable insights for predicting hydrogen transport and distribution in UHS. Furthermore, it provides a theoretical foundation and technical support for advancing underground hydrogen storage technologies.
| Country | China |
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