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Energies 2017, 10(12), 2166; doi:10.3390/en10122166

Performance Recovery of Natural Draft Dry Cooling Systems by Combined Air Leading Strategies

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
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Received: 9 November 2017 / Revised: 10 December 2017 / Accepted: 12 December 2017 / Published: 18 December 2017
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Abstract

The cooling efficiency of natural draft dry cooling system (NDDCS) are vulnerable to ambient winds, so the implementation of measures against the wind effects is of great importance. This work presents the combined air leading strategies to recover the flow and heat transfer performances of NDDCS. Following the energy balance among the exhaust steam, circulating water, and cooling air, numerical models of natural draft dry cooling systems with the combined air leading strategies are developed. The cooling air streamlines, volume effectiveness, thermal efficiency and outlet water temperature for each cooling delta of the large-scale heat exchanger are obtained. The overall volume effectiveness, average outlet water temperature of NDDCS and steam turbine back pressure are calculated. The results show that with the air leading strategies inside or outside the dry-cooling tower, the thermo-flow performances of natural draft dry cooling system are improved under all wind conditions. The combined inner and outer air leading strategies are superior to other single strategy in the performance recovery, thus can be recommended for NDDCS in power generating units. View Full-Text
Keywords: natural draft dry cooling system; air-cooled heat exchanger; dry-cooling tower; air leading strategy; thermo-flow performances; turbine back pressure natural draft dry cooling system; air-cooled heat exchanger; dry-cooling tower; air leading strategy; thermo-flow performances; turbine back pressure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, W.; Chen, L.; Huang, X.; Yang, L.; Du, X. Performance Recovery of Natural Draft Dry Cooling Systems by Combined Air Leading Strategies. Energies 2017, 10, 2166.

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