Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (08): 3179-3182.DOI: 10.16085/j.issn.1000-6613.2015.08.043

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Composition analysis and kinetic modeling of crystallization fouling in cooling seawater

YANG Dazhang1, LIU Jianhua1,2, E Xiaoxue1, JIANG Linlin1   

  1. 1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2 Shanghai Key Laboratory of Multiphase Flow and Heat Transfer of Power Engineering, Shanghai 200093, China
  • Received:2015-01-12 Revised:2015-02-23 Online:2015-08-05 Published:2015-08-05

海水冷却水析晶污垢分析及其生长模型

杨大章1, 柳建华1,2, 鄂晓雪1, 姜林林1   

  1. 1 上海理工大学能源与动力工程学院, 上海 200093;
    2 上海市动力工程多相流动与传热重点实验室, 上海 200093
  • 通讯作者: 柳建华,教授,博士生导师,主要从事制冷与换热技术研究。E-mail lwnlwn_liu@163.com。
  • 作者简介:杨大章(1986—),男,博士研究生,主要从事海水换热特性及结垢规律研究。E-mail ydz201@163.com。
  • 基金资助:
    上海市教育委员会重点学科资助项目(J50502)及上海市科委建设项目(13DZ2260900)。

Abstract: Cooling seawater is used generally in petrochemical industry, power generation and shipping, however crystallization fouling of seawater would deteriorate heat transfer and increase energy consumption. The experiments of crystallization-fouling by seawater were conducted under static condition. The crystallization fouling composition was analyzed by XRD, and the results showed that seawater fouling was CaSO4·2H2O and Mg(OH)2. A crystallization-fouling growth model was proposed as m=ke-bt+M0, and the experimental data of different roughness metal at 80℃ was fitted to the correlation with maximum relative error of 15.7%. The crystallization-fouling correlation and the growth curve showed that induction period, growth rate and mass of seawater crystallization-fouling were closely related to fouling-ions properties, super-saturation and metal surface roughness. When roughness of metal decreased, induction period of crystallization fouling became longer and grown rate became lower.

Key words: crystallization, fouling, kinetic modeling, seawater

摘要: 海水冷却水广泛应用于沿海地区的石油、化工、电力和船舶领域,但是海水容易引起严重的析晶结垢,从而降低换热效率和运行能耗。本文对海水析晶污垢的形成过程进行了静态实验研究,通过XRD分析了海水析晶污垢的组成,结果显示污垢主要成分为CaSO4·2H2O和Mg(OH)2。本文提出了海水析晶污垢的生长模型,推导了污垢生长曲线关联式m=ke-bt+M0,拟合了80℃时不同表面粗糙度试片的海水析晶污垢生长关联式和生长曲线,拟合最大相对误差15.7%。海水析晶污垢生长关联式和生长曲线显示,海水析晶结垢的诱导期、污垢生长速率和结垢量与海水中成垢离子的晶体生长活化能、过饱和度以及换热试片的表面粗糙度有关,试片的粗糙度越小,海水析晶结垢的诱导期越长,生长速率越慢。

关键词: 结晶, 结垢, 动力学模型, 海水

CLC Number: 

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