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Calculation methods of steam boiler operation factors under varying operating conditions with the use of computational thermodynamic modeling

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  • Madejski, Paweł
  • Żymełka, Piotr

Abstract

Paper presents the results of pulverized coal-fired steam boiler analysis under varying operating conditions. To investigate the efficiency of the analyzed steam boiler, the energy and exergy analysis was conducted, as well as the basic operating conditions of the flue gases-air and water-steam circuit were determined. To calculate boiler energy efficiency, the indirect method and individual boiler losses computation was applied. The thermodynamic model was developed to simulate boiler operation under partial boiler loads. The accuracy of the model results was verified at three different partial loads. The thermodynamic model was created using Ebsilon Professional software and a 0-dimensional thermodynamic modeling approach. The results in the form and steam temperature distributions at the outlet of all heating surfaces have been verified with available boiler measurement data. The relative error of steam temperature calculation doesn’t exceed 4.5%. The developed model allows performing calculations for variable input conditions in order to determine the basic parameters of the boiler operation and total boiler efficiency. The presented calculation methods were applied to identify the changing of boiler efficiency and basic boiler parameters during operation with under different partial loads and during the burning of different coal types. The various operating conditions have a great impact on boiler performances. Energetic and exergetic analysis carried out for boiler operating parameters were used to evaluate total boiler efficiencies. The results were presented in the form of total boiler efficiency and boiler losses as in the function of boiler load and calorific fuel value.

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  • 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).
    • Handle: RePEc:eee:energy:v:197:y:2020:i:c:s0360544220303285
    DOI: 10.1016/j.energy.2020.117221
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    4. 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.
    5. Wang, Yanhong & Li, Xiaoyu & Mao, Tianqin & Hu, Pengfei & Li, Xingcan & GuanWang,, 2022. "Mechanism modeling of optimal excess air coefficient for operating in coal fired boiler," Energy, Elsevier, vol. 261(PA).
    6. 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).
    7. Wang, Yanhong & Zou, Zhihong & Lu, Ke & Li, Qi & Hu, Pengfei & Wang, Di, 2024. "Modeling for on-line monitoring of carbon burnout coefficient in boiler under partial load," Energy, Elsevier, vol. 288(C).
    8. Jia, Xiongjie & Sang, Yichen & Li, Yanjun & Du, Wei & Zhang, Guolei, 2022. "Short-term forecasting for supercharged boiler safety performance based on advanced data-driven modelling framework," Energy, Elsevier, vol. 239(PE).
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