Sustainable energy supply and environmental impact caused by burning of fossil fuels are two of the major worldwide concerns. Regarding sustainable energy supply, several non-conventional alternatives and technologies are currently under study to be implemented from short- to mid-term. On the other hand, CO2 capture and sequestration (CCS) has been considered as a means for controlling anthropogenic greenhouse gas. Based on these considerations, CCS along with non-conventional heat mining and use of geothermal energy is one of the mid-term concepts that is subject to an in-depth research. One of those research lines involves injection of supercritical carbon dioxide (sCO2) in a naturally high-permeability hydrothermal reservoir in order to mine geothermal energy for subsequent power production. This requires to understand widely the behavior of sCO2 inside the geothermal reservoir, as well as to study feasible options for sustainable power production using sCO2 as a working fluid. The present work refers to CO2 captured from a fossil fuel plant that is compressed and injected into a geothermal reservoir forming a geothermal plume for extracting geothermal energy for power production. Assuming that hot sCO2 is available for power production, a power system is proposed and analyzed using a process simulation software. The plant configuration allows sCO2 to circulate through a direct expansion turbine for production of electricity, then sCO2 at the outlet of the turbine passes through a heat exchanger to provide heat to an organic Rankine cycle for additional power production. Supercritical CO2 leaving the heat exchanger is compressed and reinjected back into the geothermal reservoir for further heat mining. Based on a pre-selection stage, Isobutane, R245fa and CO2 were selected as working fluids to analyze the performance of these working fluids on the entire power system. The results show that the combined system makes use of geothermal heat mined by sCO2 more effectively than a pure ORC, increasing the overall energy efficiency of the system.
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ASME 2017 International Mechanical Engineering Congress and Exposition
November 3–9, 2017
Tampa, Florida, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5841-7
PROCEEDINGS PAPER
Use of Supercritical CO2 Heated With Geothermal Energy for Power Production Through Direct Expansion and Heat Supply to an ORC Cycle
Eduardo Ruiz-Casanova,
Eduardo Ruiz-Casanova
Univ. Michoacana de San Nicolás de Hidalgo, Morelia, México
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Ana Laura Soto-Sánchez,
Ana Laura Soto-Sánchez
Univ. Michoacana de San Nicolás de Hidalgo, Morelia, México
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Carlos Rubio-Maya,
Carlos Rubio-Maya
Univ. Michoacana de San Nicolás de Hidalgo, Morelia, México
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Carlos E. Romero,
Carlos E. Romero
Lehigh University, Bethlehem, PA
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Edward K. Levy
Edward K. Levy
Lehigh University, Bethlehem, PA
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Eduardo Ruiz-Casanova
Univ. Michoacana de San Nicolás de Hidalgo, Morelia, México
Ana Laura Soto-Sánchez
Univ. Michoacana de San Nicolás de Hidalgo, Morelia, México
Carlos Rubio-Maya
Univ. Michoacana de San Nicolás de Hidalgo, Morelia, México
Carlos E. Romero
Lehigh University, Bethlehem, PA
Edward K. Levy
Lehigh University, Bethlehem, PA
Paper No:
IMECE2017-72005, V006T08A018; 7 pages
Published Online:
January 10, 2018
Citation
Ruiz-Casanova, E, Soto-Sánchez, AL, Rubio-Maya, C, Romero, CE, & Levy, EK. "Use of Supercritical CO2 Heated With Geothermal Energy for Power Production Through Direct Expansion and Heat Supply to an ORC Cycle." Proceedings of the ASME 2017 International Mechanical Engineering Congress and Exposition. Volume 6: Energy. Tampa, Florida, USA. November 3–9, 2017. V006T08A018. ASME. https://doi.org/10.1115/IMECE2017-72005
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