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Experimental study on the interaction between particulate fouling and precipitation fouling in the fouling process on heat transfer tubes

机译:传热管结垢过程中颗粒结垢与沉淀结垢相互作用的实验研究

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摘要

This study investigated the interaction between particulate fouling and precipitation fouling on two different enhanced tubes and a plain tube in a shell-and-tube condenser. Three kinds of fouling, including particulate fouling, precipitation fouling, and combined fouling, were measured continuously for more than 720 h in three individual tests, respectively. For the particulate fouling, three tubes suffered a similar fouling process. The asymptotic fouling resistance of the precipitation fouling on enhanced tubes was lower than on the plain tube. However, for the combined fouling, the enhanced tube with a larger start number experienced the greatest fouling. On the same tube, the asymptotic fouling resistances ranked from least to greatest in the following order: particulate fouling, precipitation fouling, combined fouling; and the durations of the induction period ranked as: particulate fouling, precipitation fouling, combined fouling. As for the combined fouling existent in real cooling water systems, the fouling induction period on the plain tube was longer than that of enhanced tubes. Compared with the particulate fouling (SiO2) and precipitation fouling (CaCO3), which had a high bond strength on the tube surface, the combined fouling was soft and easily removed by flow erosion or collision with big particles during the induction period. This indicated that particles mixed in the water could extend the induction period of combined fouling. However, once the combined fouling started to grow, these particles sticking on the heat transfer surface provided nucleation sites for the crystallization process and, thus, increased the fouling thermal resistance significantly. In addition, the results indicated that the variation profile of the accelerated combined fouling after scaling down is similar to the fouling process in a real system. (C) 2019 Elsevier Ltd. All rights reserved.
机译:这项研究调查了两个不同的增强管和管壳式冷凝器中的普通管上的颗粒结垢和沉淀结垢之间的相互作用。在三个单独的测试中,分别连续测量了超过720小时的三种污垢,包括颗粒污垢,沉淀污垢和组合污垢。对于微粒结垢,三个管子经历了类似的结垢过程。增强管上的沉淀结垢的抗渐近结垢性比普通管上的低。然而,对于组合污垢,具有更大起始数的增强管经历了最大的污垢。在同一根管子上,渐近结垢阻力按以下顺序从最小到最大排列:颗粒结垢,沉淀结垢,组合结垢;诱导期的持续时间为:颗粒物结垢,沉淀物结垢,联合结垢。至于实际冷却水系统中存在的综合污垢,普通管上的结垢诱导期要长于增强型管上的结垢诱导期。与在管表面具有高粘结强度的颗粒结垢(SiO2)和沉淀结垢(CaCO3)相比,组合结垢柔软且易于在诱导期间通过流蚀或与大颗粒的碰撞而去除。这表明混合在水中的颗粒物可以延长组合污垢的诱导期。然而,一旦结垢开始增长,这些粘附在传热表面上的颗粒便为结晶过程提供了成核点,从而显着提高了结垢的耐热性。此外,结果表明,按比例缩小后的加速联合结垢的变化曲线与实际系统中的结垢过程相似。 (C)2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2019年第8期|1238-1250|共13页
  • 作者单位

    Harbin Inst Technol, Sch Architecture, Minist Ind & Informat Technol, Key Lab Cold Reg Urban & Rural Human Settlement E, Harbin 150090, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Architecture, Minist Ind & Informat Technol, Key Lab Cold Reg Urban & Rural Human Settlement E, Harbin 150090, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Architecture, Minist Ind & Informat Technol, Key Lab Cold Reg Urban & Rural Human Settlement E, Harbin 150090, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Architecture, Minist Ind & Informat Technol, Key Lab Cold Reg Urban & Rural Human Settlement E, Harbin 150090, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Sch Chem & Chem Engn, Harbin 150001, Heilongjiang, Peoples R China;

    Univ Illinois, Dept Agr & Biol Engn, Urbana, IL 61081 USA;

  • 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

    Interaction; Particulate fouling; Precipitation fouling; Combined fouling; Heat transfer tube;

    机译:相互作用;颗粒结垢;沉淀结垢;组合结垢;传热管;
  • 入库时间 2022-08-18 04:19:34

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