Journal
ENERGIES
Volume 10, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/en10122166
Keywords
natural draft dry cooling system; air-cooled heat exchanger; dry-cooling tower; air leading strategy; thermo-flow performances; turbine back pressure
Categories
Funding
- National Natural Science Foundation of China [51476055]
- National Basic Research Program of China [2015CB251503]
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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.
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