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Energy-Saving Strategies of Axial Flow Fans for Direct Dry Cooling System

Author

Listed:
  • Wenhui Huang

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China
    School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

  • Lei Chen

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China
    School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

  • Lijun Yang

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China
    School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

  • Xiaoze Du

    (Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China
    School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China)

Abstract

The operating conditions of axial flow fans are closely related to the thermo-flow characteristics of the mechanical draft direct dry cooling system. Moreover, the uneven distribution of cooling air driven by axial flow fans may lead to the deterioration of the heat transfer capacity of air-cooled condensers (ACCs). Therefore, developing energy-saving operating methods for axial flow fans is very meaningful. In this work, two kinds of adjustment strategies to make the flow field more uniform are proposed for a 2 × 300 MW direct dry cooling power-generating unit. The performance of ACCs in the prevailing wind direction is predicted with the help of the macro heat exchanger model. It is found that the inlet air temperatures of fans are significantly reduced by proposed strategies, especially at high wind speeds. Moreover, the minimum cooling air can meet the cooling demand of ACCs for the strategy which made the air flow rates of all fans consistent. Compared with the case without adjustment of fans, the total power consumption of the fan array was cut down effectively, up to 13.94% at the wind speed of 12 m/s. In conclusion, the energy efficiency of ACCs can be improved by the uniform flow field.

Suggested Citation

  • Wenhui Huang & Lei Chen & Lijun Yang & Xiaoze Du, 2021. "Energy-Saving Strategies of Axial Flow Fans for Direct Dry Cooling System," Energies, MDPI, vol. 14(11), pages 1-25, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3176-:d:564736
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    References listed on IDEAS

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    1. Chen, Lei & Yang, Lijun & Du, Xiaoze & Yang, Yongping, 2016. "A novel layout of air-cooled condensers to improve thermo-flow performances," Applied Energy, Elsevier, vol. 165(C), pages 244-259.
    2. Wenhui Huang & Lei Chen & Weijia Wang & Lijun Yang & Xiaoze Du, 2020. "Cooling Performance Optimization of Direct Dry Cooling System Based on Partition Adjustment of Axial Flow Fans," Energies, MDPI, vol. 13(12), pages 1-22, June.
    3. Li, Xiaoen & Wang, Ningling & Wang, Ligang & Yang, Yongping & Maréchal, François, 2018. "Identification of optimal operating strategy of direct air-cooling condenser for Rankine cycle based power plants," Applied Energy, Elsevier, vol. 209(C), pages 153-166.
    4. Yang, L.J. & Wang, M.H. & Du, X.Z. & Yang, Y.P., 2012. "Trapezoidal array of air-cooled condensers to restrain the adverse impacts of ambient winds in a power plant," Applied Energy, Elsevier, vol. 99(C), pages 402-413.
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    Cited by:

    1. Zhiling Luo & Qi Yao, 2022. "Multi-Model-Based Predictive Control for Divisional Regulation in the Direct Air-Cooling Condenser," Energies, MDPI, vol. 15(13), pages 1-18, June.
    2. Guijie Zheng & Wentao Wen & Hui Deng & Yang Cai, 2023. "Cluster Partition Operation Study of Air-Cooled Fan Groups in a Natural Wind Disturbance," Energies, MDPI, vol. 16(9), pages 1-20, April.
    3. Djordje S. Čantrak & Novica Z. Janković, 2022. "Turbulence Structure and Dynamics Investigation of Turbulent Swirl Flow in Pipe Using High-Speed Stereo PIV Data," Energies, MDPI, vol. 15(15), pages 1-13, July.

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