Circularly arranged air-cooled condensers to restrain adverse wind effects

Kong, Yanqiang; Wang, Weijia; Huang, Xianwei; Yang, Linlin; Du, Xiaoze; Yang, Yongping

doi:10.1016/j.applthermaleng.2017.06.001

Cited by 29 publications

(12 citation statements)

References 21 publications

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“…The difference between the maximum and minimum flow rate ranges from 36.3 kg/s (rows 1-8) to 22.64 kg/s (rows 1-12), and finally to 20.31 kg/s (rows 1-16) under 3 m/s ambient wind. When the wind speed is 9 m/s, the difference between the maximum and minimum flow rate ranges from 86.91 kg/s (rows 1-8) to 59.09 kg/s (rows 1-12), and finally to 39.07 kg/s (rows [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. This indicates that the proposed system can effectively provide uniform flow rates under different wind velocity conditions in winter.…”

Section: The Operation Conditions In Wintermentioning

confidence: 84%

“…Gu et al reported that two factors, including wind speed and platform height, affected the performance of ACC, and wind tunnel simulation was a suitable approach to minimize exhaust recirculation [3]. In order to overcome these shortcomings, several approaches, including that of windbreak mesh [4,5], and novel arrangements [6,7], were proposed to improve the efficiency of air-cooled condensers (ACCs) through decreasing the influence of adverse wind. Some studies involved the flow condensation inside the tube bundles Columns 2 and 6 correspond to countercurrent cells.…”

Section: Introductionmentioning

confidence: 99%

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Piping-Main Scheme for Condensers against the Adverse Impact of Environmental Conditions on Air-Cooled Thermal Power Units

Yang

et al. 2019

Energies

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To improve the adaptability of direct air-cooled power generating units to the variations of both meteorological condition and power load, a piping-main arrangement of air-cooled condensers was proposed. The heat and mass transfer models of the air-side were established for the air cooling system of 2 × 600 MW thermal power generating units. The coupled model for both flow resistance loss and condensate flow rate distributions of exhaust steam inside air-cooled condensers were developed based on the temperature fields through numerical simulation. Calculation results, including the condensate flow rate, back pressure, and coal consumption rate, were acquired under different ambient temperatures and wind velocities. The results show that the proposed piping-main arrangement can weaken the ambient wind impacts and reduce the backpressure significantly in summer by adjusting the number of air-cooled condenser cells in operation. The steam flow rate can be uniformed effectively by adjusting the number of operating air-cooled condenser cells during winter. It can also avoid the freezing accident in winter while cooling the exhaust steam of two turbines by part air-cooled condenser cells.

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Section: The Operation Conditions In Wintermentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Piping-Main Scheme for Condensers against the Adverse Impact of Environmental Conditions on Air-Cooled Thermal Power Units

Yang

et al. 2019

Energies

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“…In our previous work, as shown in Figure , the experimental scale model of the ACC cell experimental system comprises the steam condensation system, cooling air system, and vacuum system. The CP200 air flowmeter with a precision of ±2% is adopted to measure the flow rate of the axial flow fan.…”

Section: Model Developmentmentioning

confidence: 99%

Rotational speed adjustment of axial flow fans to maximize net power output for direct dry cooling power generating units

Chen

Sun

Yang

et al. 2019

Heat Trans. Asian Res.

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The power consumption of axial flow fans may account for more than 1% of the rated power output of the power generating unit, so it is of benefit to the energy efficiency of the power generating unit to propose an operation adjustment approach to axial flow fans. On the basis of representative 2 × 600 MW direct dry cooling generating units, a computational model of air-side flow and heat transfer of an air-cooled condenser (ACC) combined with exhaust steam condensation is developed, by which the airflow rate, inlet air temperature of ACCs, the power consumption of axial flow fans, turbine backpressure, and net power output of power generating units at various wind speeds and in various wind directions are obtained. The results show that the net power output in the presence of winds always decreases when the rational speeds of the first upwind row axial flow fans increase from the rated speed of 79 rpm by 10% to 86.9 rpm. However, the net power output will increase in various wind directions if the rational speeds of all the fans except the upwind first row fans increase to 86.9 rpm. This can contribute to the optimal operation of the ACC by rotational speed adjustment of axial flow fans. K E Y W O R D S air-cooled condenser, axial flow fan, backpressure, power generating unit, power output, rotational speed regulation | 361

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“…They concluded that the presence of buildings drastically affects the recirculation rate, as predicted by Borghei and Khoshkhoo. Kong et al [11] and Jin et al [12] studied the influence of the arrangement of condenser arrays on the recirculation rate. They proposed a circular and a rectangular design, respectively, which reduced both recirculation and flow reversal at the peripheral fans.…”

Section: Introductionmentioning

confidence: 99%

“…The latter can be subject to criticism since, in most of the cases, the size of the condensers (or evaporators) can be larger than the size of a regular building. Moreover, as seen in [7,8], [10][11][12][13], the surrounding buildings are modelled in the CFD simulations to get the effect of close obstacles on the recirculation rate, which justifies the use of specific rules for the CFD modelling of the evaporators.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cold Air Recirculation in the Evaporators of Large-Scale Air-Source Heat Pumps Using CFD Simulations

Rogié

Jensen

Hansen

et al. 2020

Fluids

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The present study investigates cold air recirculation in the evaporators of large-scale air-source heat pumps. A case study considered a 5 MW air-source heat pump producing heat for district heating. The heat pump comprises 20 horizontal evaporators, where each evaporator is equipped with eight fans. The evaporators were implemented in a CFD model, where the influence of the outdoor wind direction on the recirculation was investigated. Firstly, the air recirculation was analysed with no surrounding obstacles. Secondly, the surrounding building and the real ground topology was included in the CFD model, to analyse their influence on the air recirculation. The results show that recirculation occurs for all wind directions, due to the turbulent behaviour of the flow around the evaporators. The results also show that the presence of a building intensifies the recirculation when it is placed directly upstream of the evaporators due to the presence of vortices in the wake of the building. On the other hand, a ground depression helps to reduce the recirculation by having additional energy dissipation due to the sudden change in the ground direction.

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Circularly arranged air-cooled condensers to restrain adverse wind effects

Cited by 29 publications

References 21 publications

Piping-Main Scheme for Condensers against the Adverse Impact of Environmental Conditions on Air-Cooled Thermal Power Units

Piping-Main Scheme for Condensers against the Adverse Impact of Environmental Conditions on Air-Cooled Thermal Power Units

Rotational speed adjustment of axial flow fans to maximize net power output for direct dry cooling power generating units

Analysis of Cold Air Recirculation in the Evaporators of Large-Scale Air-Source Heat Pumps Using CFD Simulations

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