Dynamic modelling and energy analysis of offshore compressed air storage in the North Sea region

Ali Akbar Eftekhari, Negar Khoshnevis Gargar

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    Abstract

    Among the methods suggested for addressing the intermittency of renewable energy resources, compressed air energy storage (CAES) is considered a promising method due to its relatively low cost, scalability, fast response time, and simplicity of design and operation. In this work, we investigate the dynamic behavior of the storage of compressed air in the gas reservoirs of the North Sea using the existing infrastructures. The curtailment, i.e. stopping the windmills when the supply is much higher than the demand for electricity, is a problem in the North Sea. It is expected that this problem becomes more severe in near future with the installation of new windfarms that quadruples the windmills in the North Sea. Simultaneously, there is a political agreement to end the oil and gas production in the Danish sector of the North Sea, which makes the infrastructures available for alternative usage. The large space of the gas reservoirs that are connected to the platforms already equipped with transport pipelines, compressors, and turbines can be utilized for the storage of surplus and curtailed electricity. Here, we develop a simulator that links a dynamic model of the air flow in the gas reservoirs with the compressors and turbines and the time series data of the fluctuating wind electricity production to determine the efficiency of the process. Since the pressure change during the storage and production of air is governed by a parabolic diffusion equation, we study the effect of the permeability of the reservoir and near-well region on the overall exergy loss of the process. Moreover, since the mixing of the injected air (oxygen) with volatile hydrocarbons in the reservoir poses a big risk, we create an insitu combustion model to quantify the impacts of a potential explosion in the reservoir. We suggest a preemptive measure by pre-injecting a carbon dioxide cushion before starting the CAES process. Finally, we compare the amount of carbon dioxide emission that can be avoided in the North Sea region by CAES process compared to the alternative use of the reservoir for carbon dioxide storage.
    Original languageEnglish
    Title of host publicationProceedings of Ecos 2021 : The 34 rth International Conference On Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
    Number of pages8
    Publication date2021
    Publication statusPublished - 2021
    Event34th International Conference on Efficency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Taormina, Sicily, Italy
    Duration: 28 Jun 20212 Jul 2021
    Conference number: 34
    https://www.mdpi.com/journal/energies/special_issues/ECOS_2021

    Conference

    Conference34th International Conference on Efficency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
    Number34
    Country/TerritoryItaly
    CityTaormina, Sicily
    Period28/06/202102/07/2021
    Internet address

    Keywords

    • Exergy
    • Compressed Air Storage
    • Subsurface Energy Storage
    • Geoenergy
    • Porous Media

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