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Fouling Monitoring in Thermosiphon Reboiler

机译：热虹吸再沸器结垢监测

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摘要

A method to monitor the fouling resistance of a heat exchanger, especially the thermosiphon reboiler, is presented. The historical hourly data of reboiler and distillation column are used to analyze fouling factor. The initial value of overall heat transfer coefficient and the current overall heat transfer coefficient are needed to calculate fouling resistance. Since the initial heat transfer coefficient is not constant but is affected by operating conditions such as shell/tube flow rate and temperature, a relationship between initial heat transfer coefficient and these operating conditions has to be developed to calculate the fouling factor. However, sometimes important data such as tube-side flow, inlet/outlet temperature of hot/cold fluid, and liquid level in shell/tube, which are needed to bring out the fouling condition of equipment, are missing. With such insufficient information, the fouling behavior can be analyzed by building a new equation based on measurable data. Dimensional analysis determines the structure of the function; parameters of each term are obtainable using short-term plant data after cleaning, assuming that there is no fouling during this period. As it is not easy to measure actual fouling factor temporal change in the heat exchanger tube, the calculated fouling resistance is compared with the relative amount of solid material removed from the equipment during cleaning, and it is evaluated qualitatively. The comparison shows good agreement. In addition, the evolution of the fouling resistance of some thermosiphon reboilers over a period of a few months or even years can be matched using this model.
机译：提出了一种监测热交换器，特别是热虹吸再沸器的抗污性的方法。再沸器和蒸馏塔的历史小时数据用于分析结垢因素。需要总传热系数的初始值和当前总传热系数来计算抗污性。由于初始传热系数不是恒定的，而是受诸如壳/管流速和温度等操作条件的影响，因此必须建立初始传热系数与这些操作条件之间的关系以计算结垢因子。但是，有时缺少重要的数据，例如管道侧流量，热/冷流体的入口/出口温度以及壳/管中的液位，这些数据才可以显示设备的结垢情况。如果没有足够的信息，则可以通过基于可测数据建立新方程来分析结垢行为。维度分析确定了功能的结构；假设在此期间没有结垢，则可以使用清洗后的短期工厂数据获得每个术语的参数。由于不易测量换热管中的实际污垢因子随时间的变化，因此将计算出的污垢阻力与清洁期间从设备中去除的固体物质的相对量进行比较，并进行定性评估。比较显示出良好的一致性。另外，使用该模型可以匹配一些热虹吸再沸器在几个月甚至几年内的耐污垢性的演变。

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  • 来源
    《Heat Transfer Engineering》 |2015年第8期|780-786|共7页
  • 作者

    TAKUYA KUWAHARA; CHRISTIANTO WIBOWO; AKIYA KUBOYAMA; MITSUTAKA NAKAMURA; YOSHIHIRO YAMANE;

  • 作者单位

    Mitsubishi Chemical Corporation, 3-10 Ushiodori, Kurashiki, Okayama, Japan;

    ClearWaterBay Technology, Inc., Pomona, California, USA;

    Mitsubishi Chemical Corporation, Okayama, Japan;

    Mitsubishi Chemical Corporation, Okayama, Japan;

    Mitsubishi Chemical Corporation, Okayama, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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