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The use of pressure hot water storage tanks to improve the energy flexibility of the steam power unit

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  • Trojan, Marcin
  • Taler, Dawid
  • Dzierwa, Piotr
  • Taler, Jan
  • Kaczmarski, Karol
  • Wrona, Jan

Abstract

Existing thermal power plants must be adapted to cooperate with wind farms and other renewable energy sources by improving their flexibility. The paper analyzes the improvement of the 200MWe block's flexibility by installing hot water storage tanks. The maximum increase in the block output resulting from the shut-off of low-pressure steam bleeds is calculated. During this period, the hot water from water storage tanks is supplied to the boiler. Hot water is accumulated in pressure water tanks during the low-load period of the unit. Water with design temperature in the feed water tank flows into the water pressure tanks to reduce the electric power of the unit in the off-peak night hours. The hot water accumulated during the night in storage tanks is used to feed the boiler during the period of peak demand for electricity. The reduction in the block electric power was calculated for various volumes and charging periods of the water storage tanks. A cost analysis was carried out to demonstrate the economic profitability of installation of pressure water accumulators. It is worth mentioning that hot water tanks may also be applied to fill the boiler evaporator with hot water before the start-up of the power unit from the cold state.

Suggested Citation

  • Trojan, Marcin & Taler, Dawid & Dzierwa, Piotr & Taler, Jan & Kaczmarski, Karol & Wrona, Jan, 2019. "The use of pressure hot water storage tanks to improve the energy flexibility of the steam power unit," Energy, Elsevier, vol. 173(C), pages 926-936.
    • Handle: RePEc:eee:energy:v:173:y:2019:i:c:p:926-936
    DOI: 10.1016/j.energy.2019.02.059
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    16. Taler, Jan & Trojan, Marcin & Dzierwa, Piotr & Kaczmarski, Karol & Węglowski, Bohdan & Taler, Dawid & Zima, Wiesław & Grądziel, Sławomir & Ocłoń, Paweł & Sobota, Tomasz & Rerak, Monika & Jaremkiewicz,, 2023. "The flexible boiler operation in a wide range of load changes with considering the strength and environmental restrictions," Energy, Elsevier, vol. 263(PB).
    17. Zhang, Lei & Wang, Honggang & Feng, Ziyang & Fan, Yongsheng & Yao, Zhen & Cui, Shuangshuang, 2025. "Enhancing flexibility of coal-fired power plants via compressed air energy storage integration: A 4E (Energy, Exergy, Economic, Environmental) and operational performance analysis," Energy, Elsevier, vol. 332(C).
    18. Zhou, Jing & Duan, Fei & Wang, Yi & Su, Sheng & Hu, Song & Xiang, Jun, 2024. "Dynamic assessment of 1000 MW ultra-supercritical coal-fired power flexibility retrofitting through lean- and rich-fuel integrated gas turbine," Energy, Elsevier, vol. 305(C).
    19. Taler, Dawid & Dzierwa, Piotr & Kaczmarski, Karol & Taler, Jan, 2021. "Optimisation of heating and cooling of pressure thick-walled components operating in the saturated steam area," Energy, Elsevier, vol. 231(C).
    20. Wang, Runchen & Du, Xiaonan & Shi, Yuetao & Deng, Weipeng & Wang, Yuhao & Sun, Fengzhong, 2024. "A novel system for reducing power plant electricity consumption and enhancing deep peak-load capability," Energy, Elsevier, vol. 295(C).
    21. Shi, Xingping & He, Qing & Liu, Yixue & An, Xugang & Zhang, Qianxu & Du, Dongmei, 2024. "Thermodynamic and techno-economic analysis of a novel compressed air energy storage system coupled with coal-fired power unit," Energy, Elsevier, vol. 292(C).
    22. Liu, Zefeng & Wang, Chaoyang & Fan, Jianlin & Liu, Ming & Xing, Yong & Yan, Junjie, 2024. "Enhancing the flexibility and stability of coal-fired power plants by optimizing control schemes of throttling high-pressure extraction steam," Energy, Elsevier, vol. 288(C).
    23. Taler, Dawid & Kaczmarski, Karol & Dzierwa, Piotr & Taler, Jan & Trojan, Marcin, 2024. "Optimisation of the cooling of pressurised thick-walled components operating with fluid at saturation temperature," Energy, Elsevier, vol. 290(C).
    24. Dawid Taler & Jan Taler & Tomasz Sobota & Jarosław Tokarczyk, 2022. "Cooling Modelling of an Electrically Heated Ceramic Heat Accumulator," Energies, MDPI, vol. 15(16), pages 1-26, August.
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