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Numerical Study on the Influence Mechanism of Crosswind on Frozen Phenomena in a Direct Air-Cooled System

Author

Listed:
  • Wei Yuan

    (School of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, China)

  • Fengzhong Sun

    (School of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, China)

  • Yuanbin Zhao

    (School of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, China)

  • Xuehong Chen

    (School of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, China)

  • Ying Li

    (School of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, China)

  • Xiaolei Lyu

    (School of Energy and Power Engineering, Shandong University, 17923 Jingshi Road, Jinan 250061, China)

Abstract

The frozen phenomenon is unfavorable for the direct air-cooled condensers (DACCs) in a very cold area. The effect of crosswind on frozen phenomena in DACCs at the representative 2 × 350 MW thermal power units was investigated numerically. Results showed that when the crosswind velocity was 4 m·s −1 , the number of frozen air-cooled units reached a maximum of six. The increase of vortex range in the air-cooled unit was one of the important reasons to restrain the formation of frozen phenomena at a crosswind velocity from 4 m·s −1 to 12 m·s −1 . The frozen phenomena in the DACC disappeared when the crosswind velocity was 12 m·s −1 . As the crosswind velocity continued to increase to 28 m·s −1 , the frozen region mainly appeared at the position of column 1 row 4, where the airflow rate was the maximum and the inlet air temperature was the minimum among all air-cooled units. This phenomenon occurred because there existed a relatively high-pressure zone near the inlet of each frozen air-cooled unit. In addition, although the frozen area increased from one-third of the air-cooled unit surface to half with the crosswind velocity from 20 m·s −1 to 28 m·s −1 , the flow characteristics and the size of vortices in the air-cooled unit were similar in the above two crosswind conditions. Therefore, the key influencing factor became the airflow rate and the inlet air temperature of the air-cooled units under strong crosswind conditions. This study has important guiding significance for the antifreezing design and operation of DACCs.

Suggested Citation

  • Wei Yuan & Fengzhong Sun & Yuanbin Zhao & Xuehong Chen & Ying Li & Xiaolei Lyu, 2020. "Numerical Study on the Influence Mechanism of Crosswind on Frozen Phenomena in a Direct Air-Cooled System," Energies, MDPI, vol. 13(15), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3831-:d:389862
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    References listed on IDEAS

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