Multifluid geo-energy systems [electronic resource] : Using geologic CO2 storage for geothermal energy production and grid-scale energy storage in sedimentary basins
- Washington, D.C. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy, 2016. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 678-696 : digital, PDF file
- Additional Creators:
- Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Energy Efficiency and Renewable Energy, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information
- We present an approach that uses the huge fluid and thermal storage capacity of the subsurface, together with geologic carbon dioxide (CO2) storage, to harvest, store, and dispatch energy from subsurface (geothermal) and surface (solar, nuclear, fossil) thermal resources, as well as excess energy on electric grids. Captured CO2 is injected into saline aquifers to store pressure, generate artesian flow of brine, and provide a supplemental working fluid for efficient heat extraction and power conversion. Concentric rings of injection and production wells create a hydraulic mound to store pressure, CO2, and thermal energy. This energy storage can take excess power from the grid and excess/waste thermal energy, and dispatch that energy when it is demanded and thus enable higher penetration of variable renewable energy technologies (e.g., wind, solar). CO2 stored in the subsurface functions as a cushion gas to provide enormous pressure-storage capacity and displace large quantities of brine, some of which can be treated for a variety of beneficial uses. Geothermal power and energy-storage applications may generate enough revenues to compensate for CO2 capture costs. While our approach can use nitrogen (N2), in addition to CO2, as a supplemental fluid, and store thermal energy, this study focuses using CO2 for geothermal energy production and grid-scale energy storage. We conduct a techno-economic assessment to determine the levelized cost of electricity of using this approach to generate geothermal power. We present a reservoir pressure-management strategy that diverts a small portion of the produced brine for beneficial consumptive use to reduce the pumping cost of fluid recirculation, while reducing the risk of seismicity, caprock fracture, and CO2 leakage.
- Published through SciTech Connect., 05/05/2016., "llnl-jrnl--671958", Geosphere 12 3 ISSN 1553-040X AM, and Thomas A. Buscheck; Jeffrey M. Bielicki; Thomas A. Edmunds; Yue Hao; Yunwei Sun; Jimmy B. Randolph; Martin O. Saar.
- Funding Information:
- AC52-07NA27344 and NSF-SEP 1230691
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