Effect of Thermal Load on Evaporation Loss of Natural Draft Counter-Flow Wet Cooling Towers

2020 ◽  
Vol 12 (5) ◽  
Author(s):  
Wei Yuan ◽  
Fengzhong Sun ◽  
Xuehong Chen ◽  
Ruqing Liu
Keyword(s):  
Mathematical Model ◽  
Thermal Load ◽  
Power Plants ◽  
Cooling Towers ◽  
Counter Flow ◽  
Natural Draft ◽  
Evaporation Loss ◽  
Mass Flowrate ◽  
Rate Of Evaporation ◽  
Good Agreement

Abstract Based on the Merkel method, a mathematical model for calculating the evaporation loss of natural draft counterflow wet cooling towers (NDWCTs) was established. Taking the NDWCTs of the representative 300 MW and 600 MW power plants as the experimental objects, the calculated values obtained by the mathematical method were in good agreement with field experiment. Then, the effect of thermal load on evaporation loss of NDWCT was analyzed. The results showed that with the thermal load of NDWCT increasing, the evaporation loss increased, while the rate of evaporation loss caused by per unit change in temperature decreased. When the thermal load is the same, the evaporation loss was basically equal no matter by changing the mass flowrate or the inlet water temperature.

scholarly journals Effect of change factors on evaporation loss based on cold end system in natural draft counter-flow wet cooling towers

2021 ◽  
Vol 16 (2) ◽  
pp. JTST0015-JTST0015
Author(s):  
Wei YUAN ◽  
Fengzhong SUN ◽  
Ruqing LIU ◽  
Xuehong CHEN ◽  
Ying LI
Keyword(s):  
Cooling Towers ◽  
Counter Flow ◽  
Natural Draft ◽  
Evaporation Loss ◽  
Change Factors

scholarly journals The Effect of Air Parameters on the Evaporation Loss in a Natural Draft Counter-Flow Wet Cooling Tower

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6174
Author(s):  
Wei Yuan ◽  
Fengzhong Sun ◽  
Ruqing Liu ◽  
Xuehong Chen ◽  
Ying Li
Keyword(s):  
Temperature Difference ◽  
Heat Dissipation ◽  
Cooling Tower ◽  
Air Humidity ◽  
Counter Flow ◽  
Natural Draft ◽  
Evaporation Loss ◽  
Relative Air Humidity ◽  
Evaporation Heat ◽  
Rate Of Evaporation

The measures to reduce the impact of evaporation loss in a natural draft counter-flow wet cooling tower (NDWCT) have important implications for water conservation and emissions reduction. A mathematical model of evaporation loss in the NDWCT was established by using a modified Merkel method. The NDWCTs in the 300 MW and 600 MW power plant were taken as the research objects. Comparing experimental values with calculated values, the relative error was less than 3%. Then, the effect of air parameters on evaporation loss of NDWCT was analyzed. The results showed that, with the increase of dry bulb temperature, the evaporation heat dissipation and the evaporation loss decreased, while the rate of evaporation loss caused by unit temperature difference increased. The ambient temperature increased by 1 °C and the evaporation loss was reduced by nearly 26.65 t/h. When the relative air humidity increased, the evaporation heat dissipation and evaporation loss decreased, and the rate of evaporation loss caused by unit temperature difference decreased. When relative air humidity increased by 1%, the outlet water temperature rose by about 0.08 °C, and the evaporation loss decreased by about 5.63 t/h.

A novel method to predict the transient start-up time for natural draft dry cooling towers in dispatchable power plants

2019 ◽  
Vol 145 ◽  
pp. 118794 ◽  
Author(s):  
Peixin Dong ◽  
Antonio S. Kaiser ◽  
Zhiqiang Guan ◽  
Xiaoxiao Li ◽  
Hal Gurgenci ◽  
...  
Keyword(s):  
Power Plants ◽  
Cooling Towers ◽  
Natural Draft ◽  
Start Up ◽  
Novel Method ◽  
Dry Cooling

Structural improvement to accelerate the start-up process of natural draft dry cooling towers in dispatchable power plants

2020 ◽  
Vol 181 ◽  
pp. 116017
Author(s):  
Peixin Dong ◽  
Jianyong Wang ◽  
Xiaoxiao Li ◽  
Zhiqiang Guan ◽  
Hal Gurgenci ◽  
...  
Keyword(s):  
Power Plants ◽  
Cooling Towers ◽  
Natural Draft ◽  
Structural Improvement ◽  
Start Up ◽  
Dry Cooling

The crosswind effects on the start-up process of natural draft dry cooling towers in dispatchable power plants

2019 ◽  
Vol 135 ◽  
pp. 950-961 ◽  
Author(s):  
Peixin Dong ◽  
Xiaoxiao Li ◽  
Kamel Hooman ◽  
Yubiao Sun ◽  
Jishun Li ◽  
...  
Keyword(s):  
Power Plants ◽  
Cooling Towers ◽  
Natural Draft ◽  
Start Up ◽  
Dry Cooling

scholarly journals An analytical model on thermal performance evaluation of counter flow wet cooling tower

2017 ◽  
Vol 21 (6 Part A) ◽  
pp. 2491-2501 ◽  
Author(s):  
Qian Wang ◽  
Pei-Hong Wang ◽  
Zhi-Gang Su
Keyword(s):  
Analytical Model ◽  
Thermal Performance ◽  
Power Plants ◽  
Cooling Tower ◽  
Cooling Towers ◽  
Counter Flow ◽  
Water Surface Temperature ◽  
Mass Transfer Processes ◽  
Proposed Model ◽  
Simultaneous Heat

This paper proposes an analytical model for simultaneous heat and mass transfer processes in a counter flow wet cooling tower, with the assumption that the enthalpy of the saturated air is a linear function of the water surface temperature. The performance of the proposed analytical model is validated in some typical cases. The validation reveals that, when cooling range is in a certain interval, the proposed model is not only comparable with the accurate model, but also can reduce computational complexity. In addition, with the proposed analytical model, the thermal performance of the counter flow wet cooling towers in power plants is calculated. The results show that the proposed analytical model can be applied to evaluate and predict the thermal performance of counter flow wet cooling towers.

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