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J4  2014, Vol. 48 Issue (4): 666-670    DOI: 10.3785/j.issn.1008-973X.2014.04.016
机械与能源工程     
盐水冷却塔传热传质特性的实验研究
汪超, 董飞英, 范利武, 俞自涛, 胡亚才
浙江大学 热工与动力系统研究所,浙江 杭州 310027
Experimental study of heat and mass transfer of saltwater cooling tower
WANG Chao, DONG Fei-ying, FAN Li-wu, YU Zi-tao, HU Ya-cai
Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, China
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摘要:

为了研究高浓度盐水冷却塔的传热传质特性,通过机械通风式逆流冷却塔实验台,在不同进塔盐水温度(28~50 ℃)的条件下,研究改变盐水质量分数(6%、12%、16%、25%和34%的氯化钙溶液)及雷诺数Re(范围:2 000~16 000)分别对无量纲换热系数NuV和无量纲传质系数ShV的影响.结果表明:NuVPr-1/3和ShVSc-1/3均与Re无关,即在填料层内发生了关于Re的自模化现象;随着盐水质量分数的升高,盐水冷却塔的传热和传质性能均有所下降.当盐水质量分数由6%提高到34%时,NuVPr-1/3的平均值下降了51.5%,ShVSc-1/3的平均值下降了45.8%.通过线性拟合得到了NuVPr-1/3和ShVSc-1/3随盐水质量分数变化的关联式.

Abstract:

Experiments were performed on a mechanical-draft counter-flow cooling tower to analyze the heat and mass transfer of saltwater cooling towers at high concentrations. By maintaining the inlet saltwater temperature at 28~50 ℃,the effects of mass fraction of the saltwater (6%, 12%, 16%, 25%, and 34% aqueous CaCl2 solutions) and Reynolds number Re (ranging between 2 000~16 000) on the non-dimensional heat and mass transfer coefficients, NuV and ShV were respectively analyzed. Results show that self-scaling phenomenon is occurred in packing layer of saltwater cooling tower, and the NuV Pr-1/3 and ShV Sc-1/3 are nearly independent of Re. The heat and mass transfer performance of the cooling towers deteriorates with increasing the concentration of the saltwater. When the mass fraction is increased from 6% to 34%, NuVPr-1/3 and ShVSc-1/3 are decreased by 51.5% and 45.8%, respectively. Correlations of NuVPr-1/3 and ShVSc-1/3 to the variation of concentration were proposed based on linear curve fitting.

出版日期: 2014-09-03
:  TK 124  
通讯作者: 胡亚才,男,教授.     E-mail: huyacai@zju.edu.cn
作者简介: 汪超(1987—),男,硕士生,从事电厂热能动力与强化传热的研究.E-mail:21027047@zju.edu.cn
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引用本文:

汪超, 董飞英, 范利武, 俞自涛, 胡亚才. 盐水冷却塔传热传质特性的实验研究[J]. J4, 2014, 48(4): 666-670.

WANG Chao, DONG Fei-ying, FAN Li-wu, YU Zi-tao, HU Ya-cai. Experimental study of heat and mass transfer of saltwater cooling tower. J4, 2014, 48(4): 666-670.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2014.04.016        http://www.zjujournals.com/eng/CN/Y2014/V48/I4/666

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