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Techno-Economic Optimization of CO 2 -to-Methanol with Solid-Oxide Electrolyzer

Author

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  • Hanfei Zhang

    (Department of Energy, Systems, Territory and Constructions Engineering, University of Pisa, 56122 Pisa, Italy)

  • Ligang Wang

    (Group of Energy Materials, Swiss Federal Institute of Technology in Lausanne (EPFL), 1950 Sion, Switzerland
    Industrial Process and Energy Systems Engineering, Swiss Federal Institute of Technology in Lausanne (EPFL), 1950 Sion, Switzerland)

  • Jan Van herle

    (Group of Energy Materials, Swiss Federal Institute of Technology in Lausanne (EPFL), 1950 Sion, Switzerland)

  • François Maréchal

    (Industrial Process and Energy Systems Engineering, Swiss Federal Institute of Technology in Lausanne (EPFL), 1950 Sion, Switzerland)

  • Umberto Desideri

    (Department of Energy, Systems, Territory and Constructions Engineering, University of Pisa, 56122 Pisa, Italy)

Abstract

Carbon capture and utilization are promising to tackle fossil-fuel depletion and climate change. CO 2 hydrogenation can synthesize various chemicals and fuels, such as methanol, formic acid, urea, and methane. CO 2 -to-methanol integrated with solid-oxide electrolysis (SOE) process can store renewable power in methanol while recycling recovered CO 2 , thus achieving the dual purposes of storing excess renewable power and reducing lifetime CO 2 emissions. This paper focuses on the techno-economic optimization of CO 2 hydrogenation to synthesize green methanol integrated with solid-oxide electrolysis process. Process integration, techno-economic evaluation, and multi-objective optimization are carried out for a case study. Results show that there is a trade-off between energy efficiency and methanol production cost. The annual yield of methanol of the studied case is 100 kton with a purity of 99.7%wt with annual CO 2 utilization of 150 kton, representing the annual storage capacity of 800 GWh renewable energy. Although the system efficiency is rather high at around at 70% and varies within a narrow range, methanol production cost reaches 560 $/ton for an electricity price of 73.16 $/MWh, being economically infeasible with a payback time over 13 years. When the electricity price is reduced to 47 $/MWh and further to 24 $/MWh, the methanol production cost becomes 365 and 172 $/ton with an attractive payback time of 4.6 and 2.8 years, respectively. The electricity price has significant impact on project implementation. The electricity price is different in each country, leading to a difference of the payback time in different locations.

Suggested Citation

  • Hanfei Zhang & Ligang Wang & Jan Van herle & François Maréchal & Umberto Desideri, 2019. "Techno-Economic Optimization of CO 2 -to-Methanol with Solid-Oxide Electrolyzer," Energies, MDPI, vol. 12(19), pages 1-15, September.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:19:p:3742-:d:272338
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    References listed on IDEAS

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    Cited by:

    1. Svitnič, Tibor & Sundmacher, Kai, 2022. "Renewable methanol production: Optimization-based design, scheduling and waste-heat utilization with the FluxMax approach," Applied Energy, Elsevier, vol. 326(C).
    2. Zhang, Hanfei & Wang, Ligang & Van herle, Jan & Maréchal, François & Desideri, Umberto, 2020. "Techno-economic evaluation of biomass-to-fuels with solid-oxide electrolyzer," Applied Energy, Elsevier, vol. 270(C).
    3. Wang, Ligang & Zhang, Yumeng & Pérez-Fortes, Mar & Aubin, Philippe & Lin, Tzu-En & Yang, Yongping & Maréchal, François & Van herle, Jan, 2020. "Reversible solid-oxide cell stack based power-to-x-to-power systems: Comparison of thermodynamic performance," Applied Energy, Elsevier, vol. 275(C).
    4. Hermesmann, M. & Grübel, K. & Scherotzki, L. & Müller, T.E., 2021. "Promising pathways: The geographic and energetic potential of power-to-x technologies based on regeneratively obtained hydrogen," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    5. Zhang, Hanfei & Wang, Ligang & Van herle, Jan & Maréchal, François & Desideri, Umberto, 2020. "Techno-economic comparison of green ammonia production processes," Applied Energy, Elsevier, vol. 259(C).
    6. Adnan, Muflih A. & Kibria, Md Golam, 2020. "Comparative techno-economic and life-cycle assessment of power-to-methanol synthesis pathways," Applied Energy, Elsevier, vol. 278(C).
    7. Huang, Renxing & Kang, Lixia & Liu, Yongzhong, 2022. "Renewable synthetic methanol system design based on modular production lines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 161(C).

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