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Integrating an oxygen enriched waste to energy plant with cryogenic engines and Air Separation Unit: Technical, economic and environmental analysis

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  • Tafone, Alessio
  • Dal Magro, Fabio
  • Romagnoli, Alessandro

Abstract

One of the main benefits of using oxygen enriched combustion in Waste-to-Energy plants is the reduction of losses at the stack due to the reduced flue gas production. At the same time, the electricity required by the Air Separation Unit to generate the oxygen, leads to a penalty in energy efficiency that puts at stake its economic feasibility. In order to overcome that criticality, an opportunity is offered by the possibility to exploit one of the main by-products of the Air Separation Units (i.e. liquid nitrogen) by means of a high efficiency open Rankine-cycle expander, namely the Dearman Engine (i.e. cryogenic engine). The proposed research investigates the feasibility of an integrated system - Waste-to-Energy plant, Air Separation Unit and Dearman Engine - in terms of technical, economic and environmental performance indices such as power output, economic savings, incremental income and pollutant emissions reduction. The results show that, under opportune conditions (i.e. liquid nitrogen utilization factor and diesel price higher than 83% and 1.08 USD/kg, respectively) the penalty in energy efficiency coming from the integration between the Waste-to-Energy plant and the Air Separation Unit can be compensated, both economically, with a pay-back time inferior to 10 years, and environmentally (saving 23 kton/year of CO2), by means of the valorisation of the liquid nitrogen through the Dearman Engine.

Suggested Citation

  • Tafone, Alessio & Dal Magro, Fabio & Romagnoli, Alessandro, 2018. "Integrating an oxygen enriched waste to energy plant with cryogenic engines and Air Separation Unit: Technical, economic and environmental analysis," Applied Energy, Elsevier, vol. 231(C), pages 423-432.
    • Handle: RePEc:eee:appene:v:231:y:2018:i:c:p:423-432
    DOI: 10.1016/j.apenergy.2018.09.024
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    References listed on IDEAS

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    Cited by:

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    3. Vilardi, Giorgio & Verdone, Nicola, 2022. "Exergy analysis of municipal solid waste incineration processes: The use of O2-enriched air and the oxy-combustion process," Energy, Elsevier, vol. 239(PB).
    4. Miroslav Variny & Dominika Jediná & Miroslav Rimár & Ján Kizek & Marianna Kšiňanová, 2021. "Cutting Oxygen Production-Related Greenhouse Gas Emissions by Improved Compression Heat Management in a Cryogenic Air Separation Unit," IJERPH, MDPI, vol. 18(19), pages 1-32, October.
    5. Yoon, Kwangsuk & Lee, Sang Soo & Ok, Yong Sik & Kwon, Eilhann E. & Song, Hocheol, 2019. "Enhancement of syngas for H2 production via catalytic pyrolysis of orange peel using CO2 and bauxite residue," Applied Energy, Elsevier, vol. 254(C).
    6. Zhang, Tongtong & She, Xiaohui & You, Zhanping & Zhao, Yanqi & Fan, Hongjun & Ding, Yulong, 2022. "Cryogenic thermoelectric generation using cold energy from a decoupled liquid air energy storage system for decentralised energy networks," Applied Energy, Elsevier, vol. 305(C).
    7. Ishaq, H. & Dincer, I., 2019. "Exergy analysis and performance evaluation of a newly developed integrated energy system for quenchable generation," Energy, Elsevier, vol. 179(C), pages 1191-1204.

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