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Study for Flow Phenomenon in the Circulation Water Pump Chamber using the Flow-3D Model

Flow-3D 모형을 이용한 순환수취수펌프장 내 흐름현상 연구

  • Received : 2019.01.11
  • Accepted : 2019.04.05
  • Published : 2019.04.30

Abstract

Indonesia has a very short supply of electricity. As a solution to this problem, plans for construction of thermal power plants are increasing. Thermal power plant require the cooling water system to cool the overheated engine and equipment that accompany power generation, and the circulation water pump chamber among the cooling water system are generally designed according to the ANSI (1998) standard. In this study, the design criterion $20^{\circ}$ for the spreading angle of the ANSI (1998) of the layout of the circulating water pump chamber can not be satisfied on the K-coal thermal power plant site condition in Indonesia. Therefore, 3-D numerical model experiment was carried out to obtain a hydraulically stable flow and stable structure. The Flow-3D model was used as numerical model. In order to examine the applicability of the Flow-3D model, the flow study results around the rectangular structure of Rodi (1997) and the numerical analysis results were compared around the rectangular structures. The longitudinal velocity distribution derived from numerical analysis show good agreement. In order to satisfy the design velocity in the circulating water pump chamber, a rectangular baffle favoring velocity reduction was applied. When the approach velocity into the circulating water pump chamber was occurred 1.5 m/s ~ 2.5 m/s, the angle of the separation flow on the baffle was occurred about $15^{\circ}{\sim}20^{\circ}$. By placing the baffle below the separation flow angle downstream, the design velocity of less than 0.5 m/s was satisfied at inlet bay.

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Fig. 1. Diffusion angle of CWP chamber boundary [4]

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Fig. 2. CWP chamber

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Fig. 3. The geometry of Cooling tower basin and CWP chamber

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Fig. 5. Examine section for the design velocity (unit :m/s)

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Fig. 6. Examine section for the design velocity (unit : m/s)

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Fig. 7. Examine section for the design velocity (Case 6)

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Fig. 8. Velocity development around column (unit : m/s)

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Fig. 8. Velocity development around column (unit : m/s) (Continued)

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Fig. 9. Water level in Cooling tower basin and CWP chamber

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Fig. 4. 3D model construction

Table 1. Status of diffusion angle of CWP chamber

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Table 2. Numerical analysis cases and input data

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Table 3. Approach velocity for each bay (unit : m/s)

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Acknowledgement

Supported by : 국토교통부

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