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Research Papers: Power Engineering

Performance Trends of an Air-Cooled Steam Condenser Under Windy Conditions

[+] Author and Article Information
J. A. van Rooyen1

Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africajavr@sun.ac.za

D. G. Kröger

Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africadgk@sun.ac.za

1

Corresponding author.

J. Eng. Gas Turbines Power 130(2), 023006 (Feb 29, 2008) (7 pages) doi:10.1115/1.2771567 History: Received December 05, 2006; Revised May 14, 2007; Published February 29, 2008

Air-cooled steam condensers (ACSCs) are increasingly employed to reject heat in modern power plants. Unfortunately, these cooling systems become less effective under windy conditions and when ambient temperatures are high. A better understanding of the fundamental air flow patterns about and through such ACSCs is essential if their performance is to be improved under these conditions. The present numerical study models the air flow field about and through a particular ACSC. The performance of the fans is modeled with the aid of a novel numerical approach known as the “actuator disc model.” Distorted air flow patterns that significantly reduce fan performance in certain areas and recirculatory flows that entrain hot plume air are found to be the reasons for poor ACSC performance. It is found that the reduction in fan performance is the main reason for the poor ACSC performance while recirculation of hot plume air only reduces performance by a small amount.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

Schematic of ACSC, side elevation (simplified numerical model)

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Figure 17

Ambient temperature and wind effect on saturation temperature of the turbine exhaust steam

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Figure 1

ACSC plant consisting of 5×6=30 A-frame units

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Figure 2

(a) A-frame ACSC fan unit; and (b) simplified numerical model of an ACSC fan unit

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Figure 4

Plume trajectory at a wind speed of 9m∕s

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Figure 5

Numerical model (ACSC), symmetry plane, and fan location

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Figure 6

Vector plot, v (m/s), at inlet to fan(4,1) at a wind speed of 9m∕s in the x direction

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Figure 7

Volumetric effectiveness of fans

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Figure 8

Volumetric effectiveness of ACSC (wind in the x direction)

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Figure 9

Streamline plot: global flow field showing plume vortices of increasing magnitude in the downstream direction at a wind speed of 9m∕s in the x direction

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Figure 10

Air inlet temperature of the fans in row 6, with the wind in the x direction

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Figure 11

Effectiveness of ACSC (wind in the x direction)

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Figure 15

Volumetric effectiveness of ACSC (wind in the x-y direction)

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Figure 16

Effectiveness of ACSC (wind in the x-y direction)

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Figure 18

Ambient temperature and wind effect on turbine back pressure

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Figure 12

Ambient temperature and wind effect on saturation temperature of the turbine exhaust steam

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Figure 13

Ambient temperature and wind effect on turbine back pressure

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Figure 14

Volumetric effectiveness of fans (wind in the x-y direction)

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