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Patterns in bioreactive transport in underground storage of hydrogen : impact of natural and induced heterogeneity

Abstract : In the era of energy transition and in connection with the international agreement on the transition to a climate-neutral economy by 2050, intensive research is being carried out around the world on renewable energy sources. Due to the intermittent and unpredictable nature of their functioning, the problem of storing excessively produced energy becomes a highly important problem. We are currently talking about a large capacity for storing large amounts of electricity coming from photovoltaic cells and windmills. Since electricity is mutually converted to hydrogen and vice versa, storing it in geological strata in the form of gas becomes the optimal solution.The conversion of electricity into H2 can be done by electrolysis. The process is reversible using fuel cells, where hydrogen is converted into electrical current. We obtain the chain: power - to gas - to power. As a result, there are virtually no greenhouse gases, which can lead to the decarbonization of the transport sector and energy-intensive industries.In this thesis, we analyze the storage of hydrogen in underground porous media, which can be aquifers, or depleted gas reservoirs, or ex-storages of natural gas.The subject of this thesis is the hydrodynamic analysis of transport of injected gases in a storage coupled with bacterial dynamics. As shown in previous studies, hydrogen is intensively consumed by various types of bacteria, which transform it into methane, for example. The cross-effects of bioreactions and transport determine the formation of complicated spatial structures called patterns that lead to a nonuniform distribution of hydrogen over the domain. Our main attention was focused on the impact of medium heterogeneity on pattern formation. Two types of heterogeneity were analyzed: the double porosity, in terms of the macroscopic Barenblatt’s model, and the heterogeneity induced by bacteria, growth of which creates the zones of reduced permeability or even completely clogged pores.
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Noura Eddaoui. Patterns in bioreactive transport in underground storage of hydrogen : impact of natural and induced heterogeneity. Mechanics [physics]. Université de Lorraine; Université Hassan II (Casablanca, Maroc), 2021. English. ⟨NNT : 2021LORR0244⟩. ⟨tel-03564124⟩

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