摘要：

针对低温多效海水淡化离子阱长期运行中产生的腐蚀污堵问题，采用XRF分析了填料铝环垢样的元素组成，根据溶垢率和腐蚀速率对比筛选出清洗介质，并设计现场清洗方案，最后通过监测铝环的表面形貌分析、溶垢率及腐蚀速率以及清洗前后对Fe³⁺去除率的对比等对清洗效果进行了评价。结果表明：采用质量分数为2%的氨基磺酸为清洗剂进行循环清洗，能够有效去除离子阱铝环表面垢样，溶垢率达80%以上，同时控制铝环腐蚀速率小于0.41 g/（m²·h），远低于HG/T 2387-2007《工业设备化学清洗质量标准》的要求，且清洗后的离子阱处理Fe³⁺的效率显著提高，去除率可提高4倍。

关键词: 低温多效, 海水淡化, 离子阱, 氨基磺酸, 化学清洗

Abstract:

There exists corrosion and fouling problem of ion trap in low temperature multi-effect desalination(LT-MED). In view of that, the element composition of aluminum ring scale was firstly analyzed by XRF, and the optimal cleaning agent was screened out according to the scale dissolution rate and corrosion rate. Then a suitable field cleaning program was designed. Finally, the cleaning effect was evaluated according to the comparison of surface morphology analysis, dissolving scale rate, corrosion rate, and Fe³⁺ removal rate before and after the cleaning program. The results showed that the cleaning agent of 2%(mass concentration) amino sulfonic acid could effectively remove the scale sample of aluminum ring, and the dissolving scale rate was above 80% and the corrosion rate was less than 0.41 g/(m²·h), which was far below the requirement of standard HG/T 2387-2007. After the cleaning program, the Fe³⁺ removal efficiency was obviously improved and the removal rate was increased by 4 times.

Key words: low temperature multi-effect desalination, seawater desalination, ion trap, amino sulfonic acid, chemical cleaning

中图分类号: 

• P747