![]() ![]() Nevertheless, practical experience of underground hydrogen storage is still rare. Large amounts of hydrogen can be stored in depleted oil and gas fields, in salt caverns, and in aquifers. Underground hydrogen storage (UHS) is used to store large amounts of hydrogen generated from renewable energy sources (such as wind and solar) to compensate for seasonal fluctuations in the supply and demand of energy. A wide range of conditions for optimized hydrogen storage in depleted gas fields is identified. Loss of aqueous hydrogen by diffusion is minimal. Hydrogen storage causes a slight decrease in porosity of the reservoir rock. Crucial parameters are the amount of available electron acceptors, the storage time, and the kinetic rate constants. The parameters that influence the hydrogen loss are identified. BIOTECH UNDERGROUND PURE 6 EXTREME FORMULA CODEThe modeling code is PHREEQC (pH-REdox-EQuilibrium written in the C programming language). The one-dimensional diffusive mass transport model is based on equilibrium reactions for gas–water–rock interactions and kinetic reactions for sulfate reduction and methanogenesis. A hydrogeochemical modeling approach is developed to analyze these risks and to understand the basic hydrogeochemical mechanisms of hydrogen storage over storage times at the reservoir scale. These risks lead to loss of hydrogen and thus to a loss of energy. The risks of hydrogen storage in depleted gas fields include the conversion of hydrogen to CH 4(g) and H 2S (g) due to microbial activity, gas–water–rock interactions in the reservoir and cap rock, which are connected with porosity changes, and the loss of aqueous hydrogen by diffusion through the cap rock brine. Underground hydrogen storage is a potential way to balance seasonal fluctuations in energy production from renewable energies. ![]()
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