WATER DISTRIBUTION DESIGN FOR SUPER LARGE NATURAL DRAFT COUNTER FLOW SEAWATER COOLING TOWER

2019 ◽  
Vol 2019.27 (0) ◽  
pp. 1863
Author(s):  
Xiao-qing LIU ◽  
Rong-yong Zhang ◽  
Wei Bai
Keyword(s):  
Water Distribution ◽  
Cooling Tower ◽  
Counter Flow ◽  
Natural Draft

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.

Study of operation of natural draft cooling tower, with its hydraulic load reduced

2020 ◽  
Vol 12 (4) ◽  
pp. 268-273
Author(s):  
A. I. Badriev ◽  
V. N. Sharifullin ◽  
S. M. Vlasov ◽  
N. D. Chichirova
Keyword(s):  
Distribution System ◽  
Power Plants ◽  
Water Distribution ◽  
Cooling Tower ◽  
Air Flow ◽  
Thermal Power ◽  
Natural Draft ◽  
Irrigation Density ◽  
Hydraulic Load ◽  
Air Flows

A survey has been held of a BG-2600 natural draft cooling tower of thermal power plants, in the reduced hydraulic load mode. The technical condition of the reinforced concrete tower, the skeleton frame, the irrigation device, the water distribution system and the air duct windows has been inspected. Defects of the cooling tower structural elements have been identified. These include: horizontal sagging of the irrigation device, considerable gaps between its blocks and their partial destruction, problems with nozzles and structures of air duct windows. The identified defects are attributed to the causes of irregular water and air flows. The degree of irregularity of irrigation density and air flow in the tower has been estimated. Over the cross-section of the tower, a significant standard deviation from the average value or irregularity of irrigation density (30%) and irregularity of air flow (23.5%) has been established. The temperature and cooling curves of the cooling tower have been plotted taking into account irregularities of irrigation density and air flow rate. Normal and defective sections of the cooling tower have been identified based on working characteristics. Standard characteristics of the BG-2600 cooling tower have been plotted based on a nomogram. A comparative analysis of the working and standard characteristics has been held. The degree of influence produced by irregularities in water and air flows on the cooling process has been established. It has been found that the established irregularities in water and air flows result in a decrease in the temperature difference on average by 2°C and a decrease of cooling capacity by 7.3 Mcal/m2∙hr with a hydraulic load of 8840 m3/h. The results indicate a significant impact produced by irregularities of flows on cooling effect. The tasks to eliminate irregularities in distribution of flows as well as to increase the tower cooling efficiency have been formulated.

Three-Dimensional Numerical Study on Thermal Performance in a Natural Draft Wet Cooling Tower

2012 ◽  
Vol 614-615 ◽  
pp. 169-173
Author(s):  
Shui Hua Zheng ◽  
Tai Jin ◽  
Jian Ren Fan
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Thermal Performance ◽  
Water Distribution ◽  
Cooling Tower ◽  
Numerical Study ◽  
Three Dimensional ◽  
Cooling Efficiency ◽  
Natural Draft ◽  
Mass Transfer Theory

Based on the heat and mass transfer theory and characteristics of the CFD software, a three-dimensional numerical simulation platform had been developed to study the thermal performance in a natural draft wet cooling tower. This platform was validated using the measured results of a running cooling tower. The flow and temperature field in the cooling tower were investigated. It is found that the water temperature and flow field can be correctly calculated using this platform. The cooling efficiency could be improved due to non-uniform fill and water distribution methods.

Discuss of Important Issues in Numerical Simulation for Natural Draft Counter Flow Cooling Tower

2012 ◽  
Vol 516-517 ◽  
pp. 267-270
Author(s):  
Li Song ◽  
Rui Tian ◽  
Song Li ◽  
Ya Hui Wang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Mass Transfer ◽  
Drop Size ◽  
Cooling Tower ◽  
Drop Diameter ◽  
Atmospheric Density ◽  
Counter Flow ◽  
Natural Draft ◽  
Calculation Results

natural draft counter flow cooling tower heat and mass transfer numerical simulation has been widely used to optimize the cooling tower design and to improve the thermal efficiency, but in published papers, a few important problems is not attracted attention, such as how does impact grid density to the calculation results; how does impact change of atmospheric density to the calculation results; drop diameter is an important parameter in numerical simulation, but it is not a exact experimental data, it is important to discuss how does impact drop size to the calculation results. This paper will explore and analyze these issues in the numerical simulation.

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.

Numerical Simulations for Super Large-Scale Natural Draft Cooling Tower With an Optimized Non-Uniform Water Distribution

2017 ◽  
Author(s):  
J. Y. Li ◽  
H. Wang ◽  
W. Sheng
Keyword(s):  
Numerical Simulations ◽  
Water Distribution ◽  
Large Scale ◽  
Cooling Tower ◽  
Water Pressure ◽  
Water Spray ◽  
Natural Draft ◽  
Precise Data ◽  
Spray Density ◽  
Autumn And Winter

The great spray area of a Super Large-Scale Natural Draft Cooling Tower (SLNDWCT) makes it difficult to achieve an uniform wind field, and non-uniform water spray distributions are adopted in engineering. In this paper, to improve the cooling performance, optimized non-uniform water spray distributions are designed by utilizing network hydraulic calculations and numerical simulations. In the network calculations, the node-formula is applied to figure out the water pressure and flow rate of each spray nozzle, providing more precise data in simulations for the heat and mass transfer. Simulations for operating in summer, Spring/Autumn and winter seasons, which are different in water spray density, have been presented. In the operating in summer, the spray zone is divided into two regions (inner and outer regions), and by adjusting the water spray density and areas of the two regions, an improved water distribution is achieved.

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