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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of crystallization fouling on a horizontal-tube falling-film evaporator for thermal desalination
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Modeling of crystallization fouling on a horizontal-tube falling-film evaporator for thermal desalination

机译：用于热脱盐水平管落膜蒸发器的结晶污垢建模

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摘要

Scale formation within horizontal-tube falling-film evaporators is an important issue for thermal desalination, because of the deterioration of heat transfer performance and added maintenance costs. Predicting the fouling process is crucial for desalination plant design, operation, and maintenance. In this paper, a model is developed to predict the crystallization fouling process during seawater falling-film flow over a horizontal tube bundle. The scaling is estimated based on deposition theory, with couple heat transfer including the in-tube steam condensation, conduction through the tube wall and the scale layer, and falling-film evaporation. The spatial and temporal variations of temperature, heat transfer coefficient, and scale thickness are predicted, and the effects of variations in process parameters of steam, feed seawater, and tube properties on the scale thickness, evaporation rate, and heat transfer coefficient for falling-film evaporation are analyzed. Comparisons to existing experimental data show the scaling layer thickness falls in the general range of reported measurements, with a slight overestimation due to neglecting the delay of scaling onset under real conditions. The scale layer thickness increases dramatically as the in-tube steam pressure is increased or the seawater flow rate is decreased. In general, the scaling layer becomes thicker on the lower tubes in the tube bundle, due to the heat and mass transfer of the falling film. The effect of tube material on scaling appears mainly dependent on thermal conductivity; thus, using polymer rather than a stainless steel tube decreases scaling and evaporation rate 96% and 88%, respectively. This work has potential to guide thermal desalination plant design, material selection, and operating parameter optimization.
机译：水平管落膜蒸发器内的刻度形成是热脱盐的重要问题，因为传热性能的恶化并增加了维护成本。预测污垢过程对于海水淡化设备设计，操作和维护至关重要。在本文中，开发了一种模型以预测水平管束上的海水落膜流动期间的结晶结垢过程。基于沉积理论估计缩放，耦合传热包括管槽蒸汽冷凝，通过管壁和鳞片层的导通，以及落叶膜蒸发。预测温度，传热系数和比例厚度的空间和时间变化，以及蒸汽，饲料海水和管性能的过程参数变化对鳞片厚度，蒸发速率和传热系数的影响 - 分析膜蒸发。现有实验数据的比较显示缩放层厚度在报告的测量范围内落下，由于忽略了在实际条件下忽略了缩放发作的延迟而略有高估。随着管内蒸汽压力增加或海水流速降低，刻度层厚度显着增加。通常，由于下降膜的热量和传质，缩放层在管束的下部管上变得更厚。管材对缩放的影响主要取决于导热率;因此，使用聚合物而不是不锈钢管，分别降低缩放和蒸发速率96％和88％。这项工作有可能导向热海水淡化设备设计，材料选择和操作参数优化。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121596.1-121596.20|共20页
  • 作者

    Hong-Qing Jin; Shantanu Shahane; Yuheng Zhang; Sophie Wang; Kashif Nawaz;

  • 作者单位

    Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign 105 S Mathews Ave Urbana IL 61801 United States;

    Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign 105 S Mathews Ave Urbana IL 61801 United States;

    Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign 105 S Mathews Ave Urbana IL 61801 United States;

    Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign 105 S Mathews Ave Urbana IL 61801 United States;

    Oak Ridge National Laboratory 1 Bethel Valley Rd Oak Ridge TN 37830 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermal desalination; Simulation of heat and mass transfer; Scale formation; Falling-film evaporation; In-tube condensation;

    机译：热脱盐;仿真热量和传质;规模形成;坠落膜蒸发;管冷凝;

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