A review of technical and regulatory limits for hydrogen blending in natural gas pipelines

Molecular Simulation of H2/CH4 Mixture Storage and Adsorption in Kaolinite Nanopores for Underground Hydrogen Storage

“…But when the pore size is larger than 100 nm, the adsorption density becomes almost constant for both gases. However, the selectivity for H 2 is always larger than unity at the H 2 fraction of 20%, which is a significant implication for future research on UHS 7,8 as the stored H 2 fraction is more than 20% compared to the original gas composition.…”

“…Hydrogen has been recognized as one of the most potential renewable energies in recent years. − However, the direct usage of pure hydrogen remains a challenge due to the concern for safety and vast investment of hydrogen transportation and storage. − Therefore, it has been proposed to add hydrogen into the existing natural gas transportation and storage systems as the addition of a hydrogen fraction below 20% proved to cause no major effect on the pipeline and gas storage facilities. − Thus, the hydrogen is inevitably injected into the underground gas reservoirs, which are often used for the seasonal storage of natural gas. , However, the mechanism of the H 2 /CH 4 mixture in the underground porous reservoirs is unclear, and it is essential to understand the storage and adsorption capacity of the gas mixture in the reservoir pores before hydrogen is blended into the natural gas system.…”

Comprehensive Review on Thermal Performance Enhancement of Domestic Gas Stoves

“…Currently (as of 1 May), there are five relevant articles published in 2023, so we predict that there will still be a high level of research interest this year. The main reason for this is that with the advancement of zero carbon plans around the world, there is now more and more research into HENG fuels and many countries have started HENG fuel projects. − …”

Study assessment of water electrolysis systems for green production of pure hydrogen and natural gas blending

“…The significant difference in the NG and H2 density, lower values of Wobbe index and HHV, the increased risk of H2 leakage, as well as the embrittlement of steels under the influence of hydrogen are limiting for the threshold of NG blending in existing gas networks [26]. Another obstacle is the higher NOx levels when burning H2 blended NG, due to the increase in flame temperature.…”