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Hybrid Fuel Cell—Supercritical CO 2 Brayton Cycle for CO 2 Sequestration-Ready Combined Heat and Power

Author

Listed:
  • Rhushikesh Ghotkar

    (School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287-6106, USA)

  • Ellen B. Stechel

    (ASU LightWorks ® and School of Molecular Sciences, Arizona State University, Tempe, AZ 85287-5402, USA)

  • Ivan Ermanoski

    (ASU LightWorks ® and School of Sustainability, Arizona State University, Tempe, AZ 85287-5402, USA)

  • Ryan J. Milcarek

    (School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287-6106, USA)

Abstract

The low prices and its relatively low carbon intensity of natural gas have encouraged the coal replacement with natural gas power generation. Such a replacement reduces greenhouse gases and other emissions. To address the significant energy penalty of carbon dioxide (CO 2 ) sequestration in gas turbine systems, a novel high efficiency concept is proposed and analyzed, which integrates a flame-assisted fuel cell (FFC) with a supercritical CO 2 (sCO 2 ) Brayton cycle air separation. The air separation enables the exhaust from the system to be CO 2 sequestration-ready. The FFC provides the heat required for the sCO 2 cycle. Heat rejected from the sCO 2 cycle provides the heat required for adsorption-desorption pumping to isolate oxygen via air separation. The maximum electrical efficiency of the FFC sCO 2 turbine hybrid (FFCTH) without being CO 2 sequestration-ready is 60%, with the maximum penalty being 0.68% at a fuel-rich equivalence ratio (Φ) of 2.8, where Φ is proportional to fuel-air ratio. This electrical efficiency is higher than the standard sCO 2 cycle by 6.85%. The maximum power-to-heat ratio of the sequestration-ready FFCTH is 233 at a Φ = 2.8. Even after including the air separation penalty, the electrical efficiency is higher than in previous studies.

Suggested Citation

  • Rhushikesh Ghotkar & Ellen B. Stechel & Ivan Ermanoski & Ryan J. Milcarek, 2020. "Hybrid Fuel Cell—Supercritical CO 2 Brayton Cycle for CO 2 Sequestration-Ready Combined Heat and Power," Energies, MDPI, vol. 13(19), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:19:p:5043-:d:419008
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    References listed on IDEAS

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