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Increase the flexibility of steam boilers by optimisation of critical pressure component heating

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  • Taler, Dawid
  • Dzierwa, Piotr
  • Kaczmarski, Karol
  • Taler, Jan

Abstract

The paper presents a new method for determining the optimum fluid temperature changes during heating cylindrical thick-walled components weakened by holes. An inverse heat conduction problem was solved to determine the temperature of the fluid so that the equivalent total stress due to pressure and thermal load at the edge of the hole at the point of concentration does not exceed the allowable stress. The stress concentration factor at the edge of the hole was determined using the Finite Element Method (FEM) to represent the actual shape of the junction between the element and the stub. Optimum temperature changes of the steam-water mixture in the boiler drum and live steam temperature in the outlet header of the final superheater during the boiler start-up were determined. Based on the optimum time temperature and pressure variations determined for all boiler pressure elements, it is possible to identify the critical element. The heating time for the critical element is the longest. The critical boiler element governs the process of boiler start-up. The flexibility of the boiler can be significantly improved using the proposed method as boiler start-up times can be shortened by approximately one-third compared to current practice.

Suggested Citation

  • Taler, Dawid & Dzierwa, Piotr & Kaczmarski, Karol & Taler, Jan, 2022. "Increase the flexibility of steam boilers by optimisation of critical pressure component heating," Energy, Elsevier, vol. 250(C).
    • Handle: RePEc:eee:energy:v:250:y:2022:i:c:s0360544222007587
    DOI: 10.1016/j.energy.2022.123855
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    References listed on IDEAS

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    1. Ioannis Avagianos & Dimitrios Rakopoulos & Sotirios Karellas & Emmanouil Kakaras, 2020. "Review of Process Modeling of Solid-Fuel Thermal Power Plants for Flexible and Off-Design Operation," Energies, MDPI, vol. 13(24), pages 1-41, December.
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    3. Taler, Jan & Zima, Wiesław & Ocłoń, Paweł & Grądziel, Sławomir & Taler, Dawid & Cebula, Artur & Jaremkiewicz, Magdalena & Korzeń, Anna & Cisek, Piotr & Kaczmarski, Karol & Majewski, Karol, 2019. "Mathematical model of a supercritical power boiler for simulating rapid changes in boiler thermal loading," Energy, Elsevier, vol. 175(C), pages 580-592.
    4. Taler, Dawid & Dzierwa, Piotr & Taler, Jan, 2020. "New method for determining the optimum fluid temperature when heating pressure thick-walled components with openings," Energy, Elsevier, vol. 200(C).
    5. Taler, Jan & Dzierwa, Piotr & Taler, Dawid & Harchut, Piotr, 2015. "Optimization of the boiler start-up taking into account thermal stresses," Energy, Elsevier, vol. 92(P1), pages 160-170.
    6. Magdalena Jaremkiewicz & Dawid Taler & Piotr Dzierwa & Jan Taler, 2019. "Determination of Transient Fluid Temperature and Thermal Stresses in Pressure Thick-Walled Elements Using a New Design Thermometer," Energies, MDPI, vol. 12(2), pages 1-21, January.
    7. Madejski, Paweł & Żymełka, Piotr, 2020. "Calculation methods of steam boiler operation factors under varying operating conditions with the use of computational thermodynamic modeling," Energy, Elsevier, vol. 197(C).
    8. Taler, Jan & Węglowski, Bohdan & Taler, Dawid & Sobota, Tomasz & Dzierwa, Piotr & Trojan, Marcin & Madejski, Paweł & Pilarczyk, Marcin, 2015. "Determination of start-up curves for a boiler with natural circulation based on the analysis of stress distribution in critical pressure components," Energy, Elsevier, vol. 92(P1), pages 153-159.
    9. Rusin, Andrzej & Wojaczek, Adam, 2015. "Trends of changes in the power generation system structure and their impact on the system reliability," Energy, Elsevier, vol. 92(P1), pages 128-134.
    10. Taler, Jan & Dzierwa, Piotr & Jaremkiewicz, Magdalena & Taler, Dawid & Kaczmarski, Karol & Trojan, Marcin & Sobota, Tomasz, 2019. "Thermal stress monitoring in thick walled pressure components of steam boilers," Energy, Elsevier, vol. 175(C), pages 645-666.
    11. Magdalena Jaremkiewicz & Jan Taler, 2020. "Online Determining Heat Transfer Coefficient for Monitoring Transient Thermal Stresses," Energies, MDPI, vol. 13(3), pages 1-13, February.
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    Cited by:

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    2. Karol Kaczmarski, 2022. "Identification of Transient Steam Temperature at the Inlet of the Pipeline Based on the Measured Steam Temperature at the Pipeline Outlet," Energies, MDPI, vol. 15(16), pages 1-18, August.
    3. Woon, Kok Sin & Phuang, Zhen Xin & Taler, Jan & Varbanov, Petar Sabev & Chong, Cheng Tung & Klemeš, Jiří Jaromír & Lee, Chew Tin, 2023. "Recent advances in urban green energy development towards carbon emissions neutrality," Energy, Elsevier, vol. 267(C).

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