Thermo-economic analysis of a direct supercritical CO₂ electric power generation system using geothermal heat

Abstract

A comprehensive thermo-economic model combining a geothermal heat mining system and a direct supercritical CO₂ turbine expansion electric power generation system was proposed in this paper. Assisted by this integrated model, thermo-economic and optimization analyses for the key design parameters of the whole system including the geothermal well pattern and operational conditions were performed to obtain a minimal levelized cost of electricity (LCOE). Specifically, in geothermal heat extraction simulation, an integrated wellbore-reservoir system model (T2Well/ECO2N) was used to generate a database for creating a fast, predictive, and compatible geothermal heat mining model by employing a response surface methodology. A parametric study was conducted to demonstrate the impact of turbine discharge pressure, injection and production well distance, CO₂ injection flowrate, CO₂ injection temperature, and monitored production well bottom pressure on LCOE, system thermal efficiency, and capital cost. It was found that for a 100 MW_e power plant, a minimal LCOE of $0.177/kWh was achieved for a 20-year steady operation without considering CO₂ sequestration credit. In addition, when CO₂ sequestration credit is $1.00/t, an LCOE breakeven point compared to a conventional geothermal power plant is achieved and a breakpoint for generating electric power generation at no cost was achieved for a sequestration credit of $2.05/t.

Graphical abstract

Keywords

geothermal heat mining / supercritical CO₂ / power generation / thermo-economic analysis / optimization

References

[1] Romero C E, Wang X. Key technologies for ultra-low emissions from coal-fired power plants. In: Zhang Y S, Wang T, Pan W P, Romero C E, eds. Advances in Ultra-low Emission Control Technologies for Coal-fired Power Plants. Amsterdam: Elsevier, 2019: 39–79

[2] OSTI. GOV. Electric power monthly. Technical Report, Office of Scientific and Technical Information (OSTI), 1995

[3] Figueroa J D, Fout T, Plasynski S, Advances in CO₂ capture technology—the US Department of Energy’s carbon sequestration program. International Journal of Greenhouse Gas Control, 2008, 2(1): 9–20

[4] Randolph J B, Saar M O. Coupling carbon dioxide sequestration with geothermal energy capture in naturally permeable, porous geologic formations: implications for CO₂ sequestration. Energy Procedia, 2011, 4: 2206–2213

[5] Pan C, Chávez O, Romero C E, Heat mining assessment for geothermal reservoirs in Mexico using supercritical CO₂ injection. Energy, 2016, 102: 148–160

[6] Garapati N, Randolph J B, Saar M O. Brine displacement by CO₂, energy extraction rates, and lifespan of a CO₂-limited CO₂-Plume Geothermal (CPG) system with a horizontal production well. Geothermics, 2015, 55: 182–194

[7] Adams B M, Kuehn T H, Bielicki J M, A comparison of electric power output of CO₂ Plume Geothermal (CPG) and brine geothermal systems for varying reservoir conditions. Applied Energy, 2015, 140: 365–377

[8] Adams B M, Kuehn T H, Bielicki J M, On the importance of the thermosiphon effect in CPG (CO₂ plume geothermal) power systems. Energy, 2014, 69: 409–418

[9] Zhang L, Cui G, Zhang Y, Influence of pore water on the heat mining performance of supercritical CO₂ injected for geothermal development. Journal of CO₂ Utilization, 2016, 16: 287–300

[10] Ahn Y, Bae S J, Kim M, Review of supercritical CO₂ power cycle technology and current status of research and development. Nuclear Engineering and Technology, 2015, 47(6): 647–661

[11] Turchi C S, Ma Z W, Dyreby J. Supercritical carbon dioxide power cycle configurations for use in concentrating solar power systems. In: Proceedings of ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, Copenhagen, Denmark, 2013

[12] Persichilli M, Kacludis A, Zdankiewicz E, Supercritical CO₂ power cycle developments and commercialization: why sCO₂ can displace steam. In: Power-Gen India & Central Asia, New Delhi, India, 2012

[13] Wright S A, Conboy T M, Rochau G E, Supercritical CO₂ power cycle development summary at Sandia National Laboratories. In: 1st International Seminar on Organic Rankine Cycle Power Systems, Delft, Netherlands, 2011

[14] Mecheri M, Le Moullec Y. Supercritical CO₂ Brayton cycles for coal-fired power plants. Energy, 2016, 103: 758–771

[15] Noaman M, Saade G, Morosuk T, Exergoeconomic analysis applied to supercritical CO₂ power systems. Energy, 2019, 183: 756–765

[16] Park S, Kim J, Yoon M, Thermodynamic and economic investigation of coal-fired power plant combined with various supercritical CO₂ Brayton power cycle. Applied Thermal Engineering, 2018, 130: 611–623

[17] Sharan P, Neises T, Turchi C. Thermal desalination via supercritical CO₂ Brayton cycle: optimal system design and techno-economic analysis without reduction in cycle efficiency. Applied Thermal Engineering, 2019, 152: 499–514

[18] Li M, Xu J, Cao F, The investigation of thermo-economic performance and conceptual design for the miniaturized lead-cooled fast reactor composing supercritical CO₂ power cycle. Energy, 2019, 173: 174–195

[19] Atrens A D, Gurgenci H, Rudolph V. Economic optimization of a CO₂-based EGS power plant. Energy & Fuels, 2011, 25(8): 3765–3775

[20] Levy E K, Wang X, Pan C, Use of hot supercritical CO₂ produced from a geothermal reservoir to generate electric power in a gas turbine power generation system. Journal of CO₂ Utilization, 2018, 23: 20–28

[21] Wang X C. Investigation of geothermal heat extraction using supercritical carbon dioxide (sCO₂) and its utilization in sCO₂-based power cycles and organic Rankine cycles–a thermodynamic & economic perspective. Dissertation for the Doctoral Degree. Bethlehem: Lehigh University, 2018

[22] Wang X, Levy E K, Pan C, Working fluid selection for organic Rankine cycle power generation using hot produced supercritical CO₂ from a geothermal reservoir. Applied Thermal Engineering, 2019, 149: 1287–1304

[23] Pruess K, Oldenburg C M, Moridis G J. TOUGH2 User’s Guide Version 2[R]. Office of Scientific and Technical Information (OSTI), 1999, available at the website of UNT

[24] Pruess K. ECO2N: A TOUGH2 Fluid Property Module for Mixtures of Water, NaCl, and CO₂[R]. Office of Scientific and Technical Information (OSTI), 2005, available at the website of lbl

[25] Pan C, Romero C E, Levy E K, Fully coupled wellbore-reservoir simulation of supercritical CO₂ injection from fossil fuel power plant for heat mining from geothermal reservoirs. Journal of CO₂ Utilization, 2018, 27: 480–492

[26] Pan L, Freifeld B, Doughty C, Fully coupled wellbore-reservoir modeling of geothermal heat extraction using CO₂ as the working fluid. Geothermics, 2015, 53: 100–113

[27] Pan L, Oldenburg C M. T2Well—an integrated wellbore-reservoir simulator. Computers & Geosciences, 2014, 65: 46–55

[28] Pan L, Webb S W, Oldenburg C M. Analytical solution for two-phase flow in a wellbore using the drift-flux model. Advances in Water Resources, 2011, 34(12): 1656–1665

[29] Bezerra M A, Santelli R E, Oliveira E P, Response surface methodology (RSM) as a tool for optimization in analytical chemistry. Talanta, 2008, 76(5): 965–977

[30] Montgomery D C. Design and Analysis of Experiments. Hoboken, USA: John Wiley & Sons, 2017

[31] Gunst R F, Myers R H, Montgomery D C. Response surface methodology: process and product optimization using designed experiments. Technometrics, 1996, 38(3): 285

[32] Plus ASPEN. Aspen technology. Inc., version. 2009, available at the website of aspentech

[33] Peletiri S, Rahmanian N, Mujtaba I. CO₂ pipeline design: a review. Energies, 2018, 11(9): 2184

[34] Vandeginste V, Piessens K. Pipeline design for a least-cost router application for CO₂ transport in the CO₂ sequestration cycle. International Journal of Greenhouse Gas Control, 2008, 2(4): 571–581

[35] Sanyal S K. Cost of geothermal power and factors that affect it. In: Proceedings of 29th Workshop on Geothermal Reservoir Engineering, Stanford, California, USA, 2004

[36] Gross R, Heptonstall P, Blyth W. Investment in electricity generation: the role of costs, incentives and risks. Imperial College Centre for Energy Policy and Technology (ICEPT) for the Technology and Policy Assessment Function of the UK Energy Research Centre, 2007

[37] Boggs P T, Tolle J W. Sequential quadratic programming. Acta Numerica, 1995, 4: 1–51

[38] Rubin E S, Chen C, Rao A B. Cost and performance of fossil fuel power plants with CO₂ capture and storage. Energy Policy, 2007, 35(9): 4444–4454

[39] USCODE. 26 USC 45Q: credit for carbon oxide sequestration. 2018

[40] Turton R, Bailie R C, Whiting W B, Analysis, Synthesis, and Design of Chemical Processes (Prentice-Hall International Series in the Physical and Chemical Engineering Sciences). 2nd ed. Upper Saddle River, N.J.: Prentice Hall/PTR, 2003

[41] Silla H. Chemical Process Engineering: Design and Economics. Boca Raton: CRC Press, 2003

[42] McCollum D L, Ogden J M. Techno-economic models for carbon dioxide compression, transport, and storage & correlations for estimating carbon dioxide density and viscosity. 2006, available at the website of repec

[43] Lemmon E W, Huber M L, McLinden M O. NIST reference fluid thermodynamic and transport properties–REFPROP. 2019–4, available at the website of NIST

[44] Morris D. RSMeans Mechanical Cost Data. 40th annual edition, Cordian RSMeans Data, Rockland, MA, USA, 2017

[45] Charles J. Communications with sales rep from Mueller Environmental Designs, Inc. 2017, available at the website of muellerenvironmental

[46] Qiao Z, Tang Y, Zhang L, Design and performance analysis of a supercritical CO₂ (sCO₂)-water separator for power generation systems using hot sCO₂ from geothermal reservoirs. Geothermics, 2019, 81: 123–132

Acknowledgments

This work was funded by the Mexican National Council of Science and Technology (CONACYT in Spanish), under the Sectorial Fund for Energy Sustainability, CONACYT-Secretary of Energy (No. S0019-2012-04).

Electronic Supplementary Material

ƒSupplementary material is available in the online version of this article at https://doi.org/10.1007/s11708-021-0749-9 and is accessible for authorized users.

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