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

Wenhui Huang, Lei Chen, Lijun Yang and Xiaoze Du
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Wenhui Huang: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China
Lei Chen: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China
Lijun Yang: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China
Xiaoze Du: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, Beijing 102206, China

Energies, 2021, vol. 14, issue 11, 1-25

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.

Keywords: direct dry cooling system; air-cooled condenser; heat exchanger; energy-saving; axial flow fan; power consumption (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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