化工学报 ›› 2022, Vol. 73 ›› Issue (2): 634-642.DOI: 10.11949/0438-1157.20211297

• 流体力学与传递现象 • 上一篇    下一篇

圆筒电极抑制换热表面CaCO3污垢沉积特性研究

王兵兵(),王超,徐志明   

  1. 东北电力大学能源与动力工程学院,吉林省 吉林市 132012
  • 收稿日期:2021-09-07 修回日期:2021-11-09 出版日期:2022-02-05 发布日期:2022-02-18
  • 通讯作者: 王兵兵
  • 作者简介:王兵兵(1987—),男,博士,副教授,wangbb@neepu.edu.cn
  • 基金资助:
    国家自然科学基金项目(51706038)

Characteristics of CaCO3 fouling deposition on heat exchange surface under the action of cylinder electrode

Bingbing WANG(),Chao WANG,Zhiming XU   

  1. College of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China
  • Received:2021-09-07 Revised:2021-11-09 Online:2022-02-05 Published:2022-02-18
  • Contact: Bingbing WANG

摘要:

将一圆筒柱面电极布置在换热器入口管道处,并与高压电源正极连接,研究圆筒电极形成的非匀强电场对实验段换热表面CaCO3污垢沉积的影响。作为对比,同时分析了平行板电极(匀强电场)作用下CaCO3污垢沉积行为。结果表明,施加平行电极与圆筒电极均可抑制换热表面CaCO3污垢的沉积,抑垢率随施加电压(0~5000 V)的增加呈现先升高后降低的变化趋势。当施加平行电极时,最佳抑垢电压值为1000 V,最佳抑垢率为 73.27%。当施加圆筒电极时,最佳抑垢电压为500 V,最佳抑垢率为83%。因此,施加圆筒电极具有更好的抑垢效果,同时最佳抑垢电压更低,可降低电的消耗。此外,在无电场作用时,换热表面CaCO3晶体主要为树枝状文石结构,当施加圆筒或平行电极时,CaCO3晶体主要为块状方解石结构。

关键词: 圆筒电极, CaCO3污垢, 最佳抑垢电压, CaCO3晶体, 传热传质

Abstract:

A cylindrical electrode is arranged at the inlet pipe of the heat exchanger and connected to the positive electrode of the high-voltage power supply to study the influence of the non-uniform electric field formed by the cylindrical electrode on the deposition of CaCO3 fouling on the heat exchange surface of the experimental section. In comparison, the CaCO3 scale deposition under the action of the parallel plate electrode (uniform electric field) was discussed. The results showed that applying parallel electrode and the cylinder electrode can inhibit CaCO3 scale on heat transfer surface deposition, scale inhibition rate increased with increase of voltage (0—5000 V) firstly and then decreased. When applying parallel electrodes, the best scale inhibition voltage value is 1000 V and the best scale inhibition rate is 73.27%. When the cylinder electrode is applied, the best scale inhibition voltage is 500 V and the best scale inhibition rate is 83%. Therefore, the cylinder electrode has better scale inhibition rate, and the best scale inhibition voltage is lower which can reduce the electricity consumption. In addition, SEM analysis shows that CaCO3 crystal is mainly dendritic aragonite structure at no electric field, while CaCO3 crystal is mainly calcite structure under the action of the electric field.

Key words: cylinder electrode, CaCO3 scale, best scale inhibition voltage, CaCO3 crystal, heat and mass transfer

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