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核电厂冷却塔水汽扩散影响因素的分析

     

摘要

应用计算流体力学(CFD)技术软件STAR-CD提供的k-ε(RNG)湍流模型与拉格朗日离散相模型(DPM)相结合对Chalk point电厂冷却塔附近流场以及该冷却塔水汽抬升与扩散规律进行了相关的验证,并与SACTI模式预测冷却塔水汽抬升与扩散规律以及Meroney采用CFD技术的计算结果进行比较.基于该验证结果,分别对不同环境风速、环境温度、环境湿度、冷却塔水汽排放温度对水汽扩散的影响进行了相关的研究.结果表明,环境风速与环境温度对冷却塔水汽扩散的影响较大,而环境湿度对冷却塔水汽扩散的影响次之,冷却塔水汽排放温度对水汽扩散的影响较小.并且随着环境风速与环境温度的增大,冷却塔水汽地面沉积浓度逐渐降低;随着环境湿度的增大,冷却塔水汽地面沉积浓度也逐渐增大;随着冷却塔水汽排放温度的增大,水汽地面沉积浓度也略降低.%water vapor of small droplets from natural draft cooling tower installations would contain water treatment chemicals such that contact with plants, building surfaces and human activit y would be hazardous. Prediction of small droplets deposition is generally important. The relevant validation of the flow field near the Chalk point power plant cooling tower as well as its water vapor uplift and diffuse law are carried out which apply the combination of k-ε (RNG) turbulence model and Lagrangian discrete phase model (DPM) of a computational fluid dynamics (CFD) code STAR-CD, and compared with the predicted results of water vapor uplift and diffuse law of cooling tower which is used of SACTI model and Meroney's calculated results using CFD method in this paper. Based on the validation results, the author take the related research on the impact of the water vapor diffusion respectively of different ambient wind speeds; ambient temperatures; ambient humidity and temperatures on the water vapor emissions from cooling tower. The results show that, ambient wind speed and ambient temperature have a lager impact on the cooling tower's water vapor diffusion, ambient humidity's impact followed, and the temperature on the water vapor emissions from cooling tower is less affected. Furthermore, with the increases of ambient wind speed and ambient temperature, the concentration of water vapor ground deposition of cooling tower decreases; with the increases of ambient humidity, the concentration of water vapor ground deposition of cooling tower also increases; with the increase of temperature on the water vapor emissions from cooling tower, the concentration of water vapor ground deposition of cooling tower decrease slightly.

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