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湿冷机组自然通风冷却塔加装导流板的数值模拟

Numerical Simulation on Natural Draft Wet Cooling Tower Installing Deflectors

【作者】 金童

【导师】 周兰欣;

【作者基本信息】 华北电力大学(河北) , 动力机械及工程, 2010, 硕士

【摘要】 本文使用FLUENT数值模拟软件,对1000MW机组的自然通风湿式冷却塔进行了数值模拟研究。通过模拟计算,环境冷空气进入雨区,在向内部流动的过程中,由于空气湿度,速度等与淋水密度不匹配,导致塔内中心区域换热效果不好,冷却效果低。在此基础上,提出了多种加装导流板的措施,增加塔内中心区域的空气上升速度和扰动,加强传热。模拟并计算了不同安装方式的效果,在其他条件都相同的情况下,提出了最佳的安装方案能使出塔水温降低0.6℃左右。

【Abstract】 Through using numerical simulation software FLUENT, research on natural draft wet cooling tower (NDWCT) of 1000MW power unit was investigated in this paper. After simulation of air temperature and humidity, the author finds that when the cold and dry ambient air enters the rain zone and flows into the tower, the mismatch between water mass velocity and air mass velocity causes the effect of heat transfer is not good in the center region. Based on the research, it proposes several methods of installing deflector to increase the air velocity and disturbance in center region and strengthen the heat transfer. Under the same conditions, the temperature after optimization decreases about 0.6℃.

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