CIESC Journal ›› 2022, Vol. 73 ›› Issue (4): 1515-1522.DOI: 10.11949/0438-1157.20211614

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Study on scale inhibition characteristics of carboxymethyl dextran by fast controlled precipitation method

Hao ZHANG(),Yu ZHAO(),Zhiming XU,Jinhui LI   

  1. College of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China
  • Received:2021-11-12 Revised:2022-02-15 Online:2022-04-25 Published:2022-04-05
  • Contact: Yu ZHAO

羧甲基葡聚糖的快速沉降法阻垢特性研究

张浩(),赵宇(),徐志明,李晋辉   

  1. 东北电力大学能源与动力工程学院,吉林省 吉林市 132012
  • 通讯作者: 赵宇
  • 作者简介:张浩(1997—),男,博士研究生,zhanghao866@yeah.net
  • 基金资助:
    国家自然科学基金项目(51976028)

Abstract:

Calcium carbonate fouling in industrial circulating cooling water is always an important problem for industrial producers. Fouling on the heat transfer surface increases the fouling resistance of heat exchanger and reduces the heat transfer efficiency of heat exchanger. Adding scale inhibitor to circulating cooling water is an effective method to control the fouling of heat exchanger. The inhibition of calcium carbonate fouling by carboxymethyl dextran of different concentrations was studied by fast controlled precipitation(FCP) method. The FCP method is a general method for evaluating scale inhibitors, which is very suitable for the research and control of scale inhibition treatment in heat exchanger. At present, the FCP method is widely used in the evaluation of water quality resources and the measurement of scale inhibition effect of scale inhibitors. By measuring the real-time pH and resistivity in the solution, the fast controlled precipitation method can reflect the inhibition effect of scale inhibitor in the nucleation and growth process of calcium carbonate. The concentration of Ca2+ in the solution was 200 mg/L, and the concentration of carboxymethyl dextran was 0.5, 1, 2 and 4 mg/L, respectively. The results show that carboxymethyl dextran has a significant effect on slowing down the nucleation process of calcium carbonate. In addition, it also significantly reduces the growth rate of crystals after calcium carbonate nucleation. When the concentration of Ca2+ was 200 mg/L, 4 mg/L carboxymethyl dextran could inhibit the nucleation and crystal growth of CaCO3. It is of great significance to the anti-scaling of calcium carbonate and the improvement of heat transfer efficiency in industrial application.

Key words: carboxymethyl dextran, scaling, calcium carbonate, fast controlled precipitation, heat transfer, adsorption

摘要:

工业循环冷却水中的碳酸钙污垢一直是困扰工业生产者的重要问题,使用快速沉降法(FCP)研究了不同浓度的羧甲基葡聚糖对于碳酸钙污垢的抑制作用。控制溶液中的钙离子浓度为200 mg/L,羧甲基葡聚糖的浓度分别为0.5、1、2和4 mg/L时,对羧甲基葡聚糖的阻垢性能进行分析。结果表明,羧甲基葡聚糖对于减缓碳酸钙的成核过程有明显效果,此外,它也显著降低了碳酸钙成核后晶体的生长速率。当羧甲基葡聚糖的浓度为4 mg/L时,羧甲基葡聚糖对于碳酸钙的成核及晶面生长起到了完全抑制的作用,对于工业应用中碳酸钙的防垢处理,提升换热效率具有借鉴意义。

关键词: 羧甲基葡聚糖, 结垢, 碳酸钙, 快速沉降法, 传热, 吸附

CLC Number: