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CFD Simulation of Hydrogen Generation and Methane Combustion Inside a Water Splitting Membrane Reactor

Author

Listed:
  • Te Zhao

    (Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China)

  • Chusheng Chen

    (Collaborative Innovation Center of Chemistry for Energy Materials, Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China)

  • Hong Ye

    (Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, China)

Abstract

Hydrogen production from water splitting remains difficult due to the low equilibrium constant (e.g., Kp ≈ 2 × 10 −8 at 900 °C). The coupling of methane combustion with water splitting in an oxygen transport membrane reactor can shift the water splitting equilibrium toward dissociation by instantaneously removing O 2 from the product, enabling the continuous process of water splitting and continuous generation of hydrogen, and the heat required for water splitting can be largely compensated for by methane combustion. In this work, a CFD simulation model for the coupled membrane reactor was developed and validated. The effects of the sweep gas flow rate, methane content and inlet temperature on the reactor performance were investigated. It was found that coupling of methane combustion with water splitting could significantly improve the hydrogen generation capacity of the membrane reactor. Under certain conditions, the average hydrogen yield with methane combustion could increase threefold compared to methods that used no coupling of combustion. The methane conversion decreases while the hydrogen yield increases with the increase in sweep gas flow rate or methane content. Excessive methane is required to ensure the hydrogen yield of the reactor. Increasing the inlet temperature can increase the membrane temperature, methane conversion, oxygen permeation rate and hydrogen yield.

Suggested Citation

  • Te Zhao & Chusheng Chen & Hong Ye, 2021. "CFD Simulation of Hydrogen Generation and Methane Combustion Inside a Water Splitting Membrane Reactor," Energies, MDPI, vol. 14(21), pages 1-17, November.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7175-:d:670249
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    References listed on IDEAS

    as
    1. Nemitallah, Medhat A. & Habib, Mohamed A. & Salaudeen, Shakirudeen A. & Mansir, Ibrahim, 2017. "Hydrogen production, oxygen separation and syngas oxy-combustion inside a water splitting membrane reactor," Renewable Energy, Elsevier, vol. 113(C), pages 221-234.
    2. Mancini, N.D. & Mitsos, A., 2011. "Ion transport membrane reactors for oxy-combustion–Part II: Analysis and comparison of alternatives," Energy, Elsevier, vol. 36(8), pages 4721-4739.
    3. Habib, Mohamed A. & Salaudeen, Shakirudeen A. & Nemitallah, Medhat A. & Ben-Mansour, R. & Mokheimer, Esmail M.A., 2016. "Numerical investigation of syngas oxy-combustion inside a LSCF-6428 oxygen transport membrane reactor," Energy, Elsevier, vol. 96(C), pages 654-665.
    4. Chaubey, Rashmi & Sahu, Satanand & James, Olusola O. & Maity, Sudip, 2013. "A review on development of industrial processes and emerging techniques for production of hydrogen from renewable and sustainable sources," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 443-462.
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