Research on Axial Flow Fan Models of Air Cooling Island in Power Plant

doi:10.12096/j.2096-4528.pgt.22159

Abstract

Abstract:

Objectives As the main equipment of the dry cooling system, the aerodynamic performances of axial flow fans play an important role in the flow and heat transfer performances of the direct dry cooling system. Because the flow and heat transfer problems of the air-cooled island spans multiple scales in geometric dimensions, the experimental method is hard to realize while the numerical simulation method is usually used. Therefore, it is necessary to discuss and analyze the accuracy of simplified lumped parameter fan model (i. e., the simplified model) used in the previous simulation work. Methods Based on the numerical simulation method, the real model containing the fan blade fan model (real model) model and the simplified model were both built. Under different weather conditions, the transport properties of the direct dry cooling system were studied. The comparison and analysis of the air-side pressure field and flow field distributions were conducted. Furthermore, the pressure drops and flow rate of the cooling air through the axial flow fan in each air-cooled condenser cell of the direct dry cooling system with different fan models were analyzed and compared. Results The difference between the real model and the simplified model is mainly reflected for the axial flow fans with low flow rates, and the difference becomes more obvious with the increase of wind speed. Conclusions The results of this paper can provide reference for improving the accuracy of numerical simulation of the direct dry cooling system.

Key words: axial flow fan, real fan model, air cooling island, numerical simulation

CLC Number:

TM 621

Xue LIU, Guodong LI, Ruiying ZHANG, Yichen HOU, Lei CHEN, Lijun YANG. Research on Axial Flow Fan Models of Air Cooling Island in Power Plant[J]. Power Generation Technology, 2024, 45(3): 545-557.

Figures/Tables 19

Tab. 1 The operation parameters of fan’s design

风机

全压/Pa

Fig. 1 Performance curves of axial flow fan

Fig. 2 Mechanical direct air cooling system

Fig. 3 Schematic diagram of computational domain

Fig. 4 Illustration of meshes

Fig. 5 Illustration of fan meshes

Tab. 2 Air volume flow rate for grid independence test

简化模型	网格数	空气的体积流量/(m³/s)
网格1	871万	15 372
网格2	1 028万	15 445
网格3	1 234万	15 495

Fig. 6 Serial number of air-cooled condenser and wind directions

Fig. 7 Pressure distributions in vertical sections at wind speed of 0 m/s for different fan models

Fig. 8 Pressure distributions in vertical section along wind direction at wind speed of 4 m/s for different fan models

Fig. 9 Pressure distributions in vertical section along wind direction at wind speed of 12 m/s for different fan models

Fig. 10 Velocity magnitude and streamline distributions in vertical section at wind speed of 0 m/s for different fan models

Fig. 11 Velocity magnitude and streamline distributions in vertical section at wind speed of 4 m/s for different fan models

Fig. 12 Velocity magnitude and streamline distributions in vertical section at wind speed of 12 m/s for different fan models

Fig. 13 Flow rate distribution of fans in the absence of wind

Fig. 14 Flow rate distribution of fans at wind speed of 4 m/s

Fig. 15 Flow rate distribution of fans at wind speed of 12 m/s

Fig. 16 Flow rate of windward axial flow fans under different wind speeds and directions

Fig. 17 Variation of total flow rate of air cooling island under various environmental conditions

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