A CFD Model Based Research On Wet Deposition of Large ... · PDF fileA CFD Model Based...

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A CFD Model Based Research On Wet Deposition of Large Scale Natural Draft Cooling Tower

Shanghai Nuclear Engineering Research & Design Institute

www.snerdi.com.cn

Wenjie Bao


Shanghai，China


1.Background 2.Methodology 3.Model Validation 4.Case Study 5.Conclusion


1. Background

Nuclear power plant construction plan

0 10 20 30 40 50 60 70 80 90 100

UnitedStatesOfAmerica

France

Japan

China

Russia

SouthKorea

Numberofreactors

NuclearPowerPlantStatusinTypicalCountries

UnderConstrucKon OperaKng


1. Background

EIA for Inland nuclear power plants

MountainousArea

CoolingTowerImpact


1. Background

Disadvantages of tradition methods

Methods Disadvantages

Gaussian model Not suggest for mountainous area

Wind tunnel experiments High demand for money and time

SF6 field experiments

CFD model √


2. Methodology

CFD Model (Computational Fluid Dynamics)

Aerodynamic

shape design


2. Methodology


Smoke plume simulation


2. Methodology


Model: Star CCM+

Validation Data: Chalk Point Plant experiment

Case study: Inland NPP sites in China (Planned)


2. Methodology

Chalk Point Power Plant

CoolingTower

Plant Overview


2. Methodology

Chalk Point Power Plant

Sampling Points Distribution

1km

0.5km


2. Methodology

3D model parameter

Chalk Point 3D model

Domainlength:2000mwidth:1000mheight:500m

Coolingtowerheight:124m

baseradius:40moutsetradius:27.4m


2. Methodology

3D model parameter

Inlet wind speed profile 6781.03523.0 zv ⋅=


2. Methodology

3D model parameter

Inlet wind speed profile


2. Methodology

3D model set up

Chalk Point grid model

PolyhedralmeshGridsizeofcoolingtower:4mGridsizeofotherpart:50~100mTotalnumberofgrid:600,000


3. Model Validation

Cooling tower plume lift

Cooling tower plume diffusion


3. Model Validation

Cooling tower plume lift

Plume lift height comparison


3. Model Validation

Cooling tower wet deposition

Cooling tower wet deposition distribution


3. Model Validation

Cooling tower wet deposition

Wet deposition data comparison


4. Case study

Inland Nuclear Power Plant in China

3D model of NPP site


4. Case study

Inland Nuclear Power Plant in China

3D grid of NPP site


4. Case study

Cooling tower design parameter

Parameters Value

Basediameter 168.66m

Height 215m

Outletdiameter 102.70m

Throatdiameter 99.0m

Twotowersdistance 110m

Eliminatorefficiency 95% DriHvelocity 4.35m/s

DriHtemperature 30.33℃

Plumemassrate 0.455kg/s


4. Case study

Model boundary conditions

Parameters Value

Windspeedat70m 5.2m/s Surfaceroughness 0.3m

Turbulenceintensity H<100m,0.1;H≥100m,0.05 Airtemperature 16.5℃

pZ

uu ⎟⎟⎠

⎞⎜⎜⎝

⎛×=

0.7070Inlet wind profile expression


4. Case study

Calculation result

Downwind centerline wet deposition distribution


4. Case study

Calculation result

Cooling tower plume diffusion pattern


5. Conclusion

l  CFD could simulate the process of cooling tower plum dispersion and

deposition well.

l  When field data is not available, CFD could be a powerful tool in

cooling tower EIA.

l  In case study, this method could reflect the blocking effect of cooling

tower, thus a more reasonable result could be provided.


5. Conclusion

l  In further studies, it is necessary to work on boundary conditions

optimization and reasonable meteorological classification, in order

that CFD model could run under multiple meteorological conditions.

l  Plume shadowing of cooling tower drift is decided by season, sun

angel and location, which are not included in CFD model. These

could be important research directions in the future.


THANK YOU ! ขอบคุณ！


www.snerdi.com.cn

Wenjie Bao Email:[email protected]

A CFD Model Based Research On Wet Deposition of Large ... · PDF fileA CFD Model Based...

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