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

Wei Yuan, Fengzhong Sun, Yuanbin Zhao, Xuehong Chen, Ying Li and Xiaolei Lyu
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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

Energies, 2020, vol. 13, issue 15, 1-18

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.

Keywords: direct air-cooled condenser; frozen phenomena; crosswind; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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