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Analysis of supercritical coal fired oxy combustion power plant with cryogenic oxygen unit and turbo-compressor

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  • Hnydiuk-Stefan, Anna
  • Składzień, Jan

Abstract

This paper reports the results of thermal, energy, exergy and economic analysis involving a hard coal fired power plant with a two-column cryogenic oxygen unit and operating in an oxy combustion process. As a novelty it was assumed that the auxiliary steam turbine drives the oxygen unit compressor and the bleeding steam for this purpose is extracted between intermediate- and low-pressure stage (ILS) of the main turbine. Calculations were performed to consider a number of alternative designs, in which the principal issue was to consider capacity and efficiency loss of the power plant resulting from the drive of the compressor from a cryogenic oxygen unit. The results showed that steam from ILS of the main turbine could be used for driving air separation unit (ASU) compressor. However, smaller loss of power and efficiency may be achieved with electrical supply of ASU. An application of oxy-fuel process to power plant will cause a decrease of gross efficiency in power unit by 12% points by using steam from ILS and 11% points by using electric motor for driving ASU. Profitability of oxy combustion technology will be achieved when the CO2 emissions price reaches a minimum of 52 Euro/EUAs.

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  • Hnydiuk-Stefan, Anna & Składzień, Jan, 2017. "Analysis of supercritical coal fired oxy combustion power plant with cryogenic oxygen unit and turbo-compressor," Energy, Elsevier, vol. 128(C), pages 271-283.
    • Handle: RePEc:eee:energy:v:128:y:2017:i:c:p:271-283
    DOI: 10.1016/j.energy.2017.04.021
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    References listed on IDEAS

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    Cited by:

    1. Son, Seongmin & Lee, Jeong Ik, 2018. "Application of adjoint sensitivity analysis method to supercritical CO2 power cycle optimization," Energy, Elsevier, vol. 147(C), pages 1153-1164.
    2. 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.
    3. Moon, Ji-Hong & Jo, Sung-Ho & Park, Sung Jin & Khoi, Nguyen Hoang & Seo, Myung Won & Ra, Ho Won & Yoon, Sang-Jun & Yoon, Sung-Min & Lee, Jae-Goo & Mun, Tae-Young, 2019. "Carbon dioxide purity and combustion characteristics of oxy firing compared to air firing in a pilot-scale circulating fluidized bed," Energy, Elsevier, vol. 166(C), pages 183-192.
    4. Trobajo, J.R. & Antuña-Nieto, C. & Rodríguez, E. & García, R. & López-Antón, M.A. & Martínez-Tarazona, M.R., 2018. "Carbon-based sorbents impregnated with iron oxides for removing mercury in energy generation processes," Energy, Elsevier, vol. 159(C), pages 648-655.

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