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Numerical Modelling of Steam Superheaters in Supercritical Boilers

Author

Listed:
  • Katarzyna Węglarz

    (Department of Thermal Processes, Air Protection and Waste Utilisation, Faculty of Environmental Engineering and Energy, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland)

  • Dawid Taler

    (Department of Thermal Processes, Air Protection and Waste Utilisation, Faculty of Environmental Engineering and Energy, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland)

  • Jan Taler

    (Department of Energy, Faculty of Environmental Engineering and Energy, Cracow University of Technology, al. Jana Pawła II 37, 31-864 Cracow, Poland)

  • Mateusz Marcinkowski

    (Department of Thermal Processes, Air Protection and Waste Utilisation, Faculty of Environmental Engineering and Energy, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland)

Abstract

This paper presents a numerical model of a four-pass supercritical steam superheater with a complex flow system. The specific heat of steam is a function of temperature and pressure, and the specific heat of flue gas is a function of temperature. Pressure and temperature changes along the length of the tubes were also determined. The modified Churchill equation was used to calculate the steam-side friction factor of Darcy–Weisbach. The flue gas temperature variations behind the individual superheater tube rows were calculated. The steam and wall temperature distributions were determined in each tube row along its length. Knowing the temperature of the tube walls and the steam along the flow direction enables the selection of the correct steel grade for the tubes. Thanks to this advantage of the proposed method, the investment can be reduced in superheater construction without the danger of overheating the tube material. The results of the superheater simulation were compared with the results of measurements on the actual object. The proposed numerical method can find application in steam superheaters’ design and performance calculations. It can also be used to monitor superheater operating parameters, which are difficult to measure due to the high flue gas temperature.

Suggested Citation

  • Katarzyna Węglarz & Dawid Taler & Jan Taler & Mateusz Marcinkowski, 2023. "Numerical Modelling of Steam Superheaters in Supercritical Boilers," Energies, MDPI, vol. 16(6), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2615-:d:1093327
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    References listed on IDEAS

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    1. Granda, Mariusz & Trojan, Marcin & Taler, Dawid, 2020. "CFD analysis of steam superheater operation in steady and transient state," Energy, Elsevier, vol. 199(C).
    2. Węglarz, Katarzyna & Taler, Dawid & Taler, Jan, 2022. "New non-iterative method for computation of tubular cross-flow heat exchangers," Energy, Elsevier, vol. 260(C).
    3. Madejski, Paweł & Taler, Dawid & Taler, Jan, 2022. "Thermal and flow calculations of platen superheater in large scale CFB boiler," Energy, Elsevier, vol. 258(C).
    4. Balint, Roland & Engblom, Markus & Niemi, Jonne & Silva da Costa, Daniel & Lindberg, Daniel & Yrjas, Patrik & Hupa, Leena & Hupa, Mikko, 2021. "Temperature gradient induced changes within superheater ash deposits high in chlorine," Energy, Elsevier, vol. 226(C).
    Full references (including those not matched with items on IDEAS)

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