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Prediction of Novel Humified Gas Turbine Cycle Parameters for Ammonia/Hydrogen Fuels

Author

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  • Milana Guteša Božo

    (Research and Development Department, Termoinžinjering Ltd., 23000 Zrenjanin, Serbia)

  • Agustin Valera-Medina

    (College of Physical Sciences and Engineering, Cardiff University, Queen’s Building, Cardiff CF243AA, UK)

Abstract

Carbon emissions reduction via the increase of sustainable energy sources in need of storage defines chemicals such as ammonia as one of the promising solutions for reliable power decarbonisation. However, the implementation of ammonia for fuelling purposes in gas turbines for industry and energy production is challenging when compared to current gas turbines fuelled with methane. One major concern is the efficiency of such systems, as this has direct implications in the profitability of these power schemes. Previous works performed around parameters prediction of standard gas turbine cycles showed that the implementation of ammonia/hydrogen as a fuel for gas turbines presents very limited overall efficiencies. Therefore, this paper covers a new approach of parameters prediction consisting of series of analytical and numerical studies used to determine emissions and efficiencies of a redesigned Brayton cycle fuelled with humidified ammonia/hydrogen blends. The combustion analysis was done using CHEMKIN-PRO (ANSYS, Canonsburg, PA, USA), and the results were used for determination of the combustion efficiency. Chemical kinetic results denote the production of very low NOx as a consequence of the recombination of species in a post combustion zone, thus delivering atmospheres with 99.2% vol. clean products. Further corrections to the cycle (i.e., compressor and turbine size) followed, indicating that the use of humidified ammonia-hydrogen blends with a total the amount of fuel added of 10.45 MW can produce total plant efficiencies ~34%. Values of the gas turbine cycle inlet parameters were varied and tested in order to determine sensibilities to these modifications, allowing changes of the analysed outlet parameters below 5%. The best results were used as inputs to determine the final efficiency of an improved Brayton cycle fuelled with humidified ammonia/hydrogen, reaching values up to 43.3% efficiency. It was notorious that humidification at the injector was irrelevant due to the high water production (up to 39.9%) at the combustion chamber, whilst further research is recommended to employ the unburned ammonia (0.6% vol. concentration) for the reduction of NOx left in the system (~10 ppm).

Suggested Citation

  • Milana Guteša Božo & Agustin Valera-Medina, 2020. "Prediction of Novel Humified Gas Turbine Cycle Parameters for Ammonia/Hydrogen Fuels," Energies, MDPI, vol. 13(21), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5749-:d:439106
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    References listed on IDEAS

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    Cited by:

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    3. Ayaz, S.Kagan & Altuntas, Onder & Caliskan, Hakan, 2021. "Enhanced life cycle modelling of a micro gas turbine fuelled with various fuels for sustainable electricity production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
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    5. Sánchez, Antonio & Castellano, Elena & Martín, Mariano & Vega, Pastora, 2021. "Evaluating ammonia as green fuel for power generation: A thermo-chemical perspective," Applied Energy, Elsevier, vol. 293(C).

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