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Production of Substitute Natural Gas Integrated with Allam Cycle for Power Generation

Author

Listed:
  • Daniele Candelaresi

    (Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, 03043 Cassino, Italy
    Energy Transition Team (EnTraT srls) Academic Spin-Off of University of Cassino and Southern Lazio, 03043 Cassino, Italy)

  • Giuseppe Spazzafumo

    (Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, 03043 Cassino, Italy
    Energy Transition Team (EnTraT srls) Academic Spin-Off of University of Cassino and Southern Lazio, 03043 Cassino, Italy)

Abstract

The accumulation of energy from non-programmable renewable sources is a crucial aspect for the energy transition. Using surplus electricity from renewable energy sources, power-to-gas plants allow to produce a substitute natural gas (SNG) that can be injected in the existing infrastructure for large-scale and long-term energy storage, contributing to gas grid decarbonisation. The plant layout, the method used for carbon dioxide capture and the possible cogeneration of electricity can increase the efficiency and convenience of SNG synthesis plants. In this work, a system for the simultaneous production of SNG and electricity starting from biomass and fluctuating electricity from renewables is proposed, using a plant based on the Allam thermodynamic cycle as the power unit. The Allam power cycle uses supercritical CO 2 as evolving fluid and is based on the oxycombustion of gaseous fuels, thus greatly simplifying CO 2 capture. In the proposed system, oxycombustion is performed using biomass syngas and electrolytic oxygen. The CO 2 generated by means of oxycombustion is captured, and it is subsequently used together with renewable hydrogen for the production of SNG through thermochemical methanation. The system is also coupled with a solid oxide electrolyser and a biomass gasifier. The whole plant was analysed from an energy-related point of view. The results show overall plant efficiency of 67.6% on an LHV basis (71.6% on an HHV basis) and the simultaneous production of significant amounts of electricity and of high-calorific-value SNG, whose composition could be compatible with the existing natural gas network.

Suggested Citation

  • Daniele Candelaresi & Giuseppe Spazzafumo, 2023. "Production of Substitute Natural Gas Integrated with Allam Cycle for Power Generation," Energies, MDPI, vol. 16(5), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:5:p:2162-:d:1078273
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    References listed on IDEAS

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    4. Mazza, Andrea & Bompard, Ettore & Chicco, Gianfranco, 2018. "Applications of power to gas technologies in emerging electrical systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 92(C), pages 794-806.
    5. Zhu, Zilong & Chen, Yaping & Wu, Jiafeng & Zhang, Shaobo & Zheng, Shuxing, 2019. "A modified Allam cycle without compressors realizing efficient power generation with peak load shifting and CO2 capture," Energy, Elsevier, vol. 174(C), pages 478-487.
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    Cited by:

    1. Fabrizio Reale, 2023. "The Allam Cycle: A Review of Numerical Modeling Approaches," Energies, MDPI, vol. 16(22), pages 1-22, November.

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