Investigating the Effects of Flue Gas Injection and Hot Water Distribution and Their Interaction on Natural Draft Wet Cooling Tower Performance

2019 ◽  
Author(s):  
Tom V. Eldredge ◽  
John M. Stapleton
Keyword(s):  
Water Temperature ◽  
Flue Gas ◽  
Water Distribution ◽  
Cooling Tower ◽  
Cold Water ◽  
Gas Injection ◽  
Hot Water ◽  
Moist Air ◽  
Cooling Performance ◽  
Natural Draft

Abstract This paper utilizes numerical modeling to address the effects of two parameters on natural draft cooling tower performance, namely the radial hot water distribution and flue gas injection. Predictions show that cold water temperature leaving the tower can be slightly decreased by increasing the weighting of the radial hot water distribution towards the tower periphery. The injection of scrubbed flue gas into the tower chimney can have either a positive or a negative effect on tower cooling performance, depending on the temperature of the flue gas relative to the temperature of moist air in the chimney. The temperature of the scrubbed flue gas is the primary variable affecting cooling tower performance, associated with flue gas injection. This paper investigates using the radial distribution of hot water to optimize the tower cooling performance when injecting scrubbed flue gas into the chimney, both for conditions when the flue gas is warmer and cooler than the temperature of moist air in the chimney. Predictions with no flue gas injection show that optimizing hot water distribution produced 0.4 °C reduction in cooled water temperature. With relatively cold (32.2 °C) and relatively hot (65.6 °C) flue gas injection, optimizing hot water distribution produced slightly more than 0.2 °C reduction in cooled water temperature.

An Investigation of the Effects of Flue Gas Injection on Natural Draft Cooling Tower Performance

1997 ◽  
Vol 119 (2) ◽  
pp. 478-484 ◽  
Author(s):  
T. V. Eldredge ◽  
D. J. Benton ◽  
J. W. Hodgson
Keyword(s):  
Flue Gas ◽  
Gas Flow ◽  
Cooling Tower ◽  
Cold Water ◽  
Control Volume ◽  
Gas Injection ◽  
Airflow Rate ◽  
Gas Temperature ◽  
Natural Draft ◽  
Cold Water Temperature

This paper addresses an investigation of flue gas injection on natural draft cooling tower performance through numerical simulation. The control volume finite difference method was used for discretizing the governing equations in axisymmetric form on a boundary-fitted grid. The five independent variables addressed in this study are flue gas flow rate, flue gas temperature, radial injection location, injection orientation, and liquid entrainment in the flue gas. The flue gas temperature was found to have the most significant effect on tower performance (cold water temperature), because it strongly affects the buoyancy within the tower. The total air flow through a tower is driven by buoyancy forces, and the cooling performance is a strong function of the airflow rate.

scholarly journals An empirical study on environmental impact of natural draft cooling tower with flue gas injection

2018 ◽  
Vol 8 (1) ◽  
pp. 44-50
Author(s):  
Shenshen Su ◽  
Renfeng Zhang ◽  
JiJun Ma ◽  
Yongping Xie ◽  
Xijin Sun ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Empirical Study ◽  
Flue Gas ◽  
Cooling Tower ◽  
Gas Injection ◽  
Natural Draft

3D CFD modeling of natural draft wet-cooling tower with flue gas injection

2015 ◽  
Vol 91 ◽  
pp. 824-833 ◽  
Author(s):  
Adam Klimanek ◽  
Michał Cedzich ◽  
Ryszard Białecki
Keyword(s):  
Flue Gas ◽  
Cooling Tower ◽  
Gas Injection ◽  
Cfd Modeling ◽  
Natural Draft

scholarly journals Influence of Flue Gas Injection on the Long-Term Durability of a Natural Draft Concrete Cooling Tower

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2038
Author(s):  
Jianmin Du ◽  
Wenjuan Zhuang ◽  
Guo Li ◽  
Pei Zhang
Keyword(s):  
Flue Gas ◽  
Cooling Tower ◽  
Effective Diffusion ◽  
Gas Injection ◽  
Chemical Compositions ◽  
Natural Draft ◽  
Corrosion Risk ◽  
Finite Element Numerical Simulation

The article undertakes the very important topic of the long-term durability of concrete in a natural draft concrete cooling tower with flue gas injection. The corrosive conditions, including temperature, relative humidity, and CO2 and SO2 gas concentrations, near the inner wall of a cooling tower with flue gas injection were monitored in real time to obtain the long-term durability performance of concrete. The pH and chemical compositions of the condensed liquid that adhered to the tower’s inner face and the macromorphology, compressive strength, and neutralization depth of in situ specimens were tested periodically. In addition, a finite element numerical simulation was conducted to simulate and verify the concentration distributions of CO2 and SO2 in the flue gas in the cooling tower. The results showed that the cleaned flue gas was enveloped, diluted, and uplifted by hot vapor in the cooling tower, and its concentration decreased. Meanwhile, the effective diffusion radius increased gradually as the flue gas rose. With the same elevation in the cooling tower, the concentration of flue gas decreased rapidly from the central point to the surrounding area. The air near the inner surface of the cooling tower was merely dampened air with a low concentration of acidic gas due to the gigantic diameter of the cooling tower. As a result, the injection of cleaned flue gas will not evidently increase the corrosion risk in a natural draft concrete cooling tower.

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