炼油技术与工程 ›› 2023, Vol. 53 ›› Issue (4): 29-33.

• 加工工艺 • 上一篇    下一篇

H2SO4/GA混合液应用于除盐水系统反渗透膜化学清洗总结

袁亮, 米精宏, 韩会亮, 宋尧, 吉生瑞   

  1. 中国石化塔河炼化有限责任公司
  • 收稿日期:2022-09-06 出版日期:2023-04-15 发布日期:2023-04-24
  • 作者简介:袁亮，工程师，本科，2016年毕业于辽宁石油化工大学化学工程与工艺专业，从事锅炉与给排水技术工作。联系电话：13779756890,E-mail:1209601755@qq.com。;

Summary of H2SO4/GA mixture for chemical cleaning of reverse osmosis membranes in demineralized water systems

Yuan Liang, Mi Jinghong, Han Huiliang, Song Yao, Ji Shengrui   

  1. SINOPEC Tahe Petrochemical Co., Ltd.
  • Received:2022-09-06 Online:2023-04-15 Published:2023-04-24

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摘要：

针对除盐水系统浓水反渗透装置硅酸垢难以清洗的问题，采用H2SO4/GA(没食子酸)混合液进行化学清洗，可以有效降低反渗透膜中聚合硅的含量。随着H2SO4/GA混合液中GA含量的增加，反渗透膜中聚合硅的含量呈降低趋势。从经济性和清洗效果两个方面考虑，当GA质量分数为7.5%时，清洗效果达到临界状态，聚合硅的最大去除率可达70%,膜出口压力比原始工况升高了0.29 MPa;应用全膜法进行制水实验，阳床、阴床周期产水量分别增加了314.8%,514.0%,混床周期产水量增加了133.1%以上，制水比降至1.07左右；中长期应用时，综合成本降低了8%左右，效果良好。

关键词: GA, 反渗透膜, 化学清洗, 聚硅酸结垢, H2SO4, 除盐水系统, 膜阻力, 制水比

Abstract:

Aiming at the problem that the concentrated water reverse osmosis silicate scale in demineralized water system is difficult to clean, chemical cleaning with H2SO4/GA(gallic acid) mixture can effectively reduce the content of polysilicon in the reverse osmosis membrane. With the increase of GA content in H2SO4/GA mixture, the content of polysilicon in reverse osmosis membrane decreases. From the aspects of economy and effect, when the mass fraction of GA is 7.5%, the cleaning effect reaches the critical state, the maximum removal rate of polysilicon can reach 70%, and the membrane outlet pressure is 0.29 MPa higher than the original condition. The water production of the cation exchanger, the anion exchanger and the mixed ion exchanger increases by 314.8%, 514.0% and 133.1% respectively, and the water production ratio decreases to 1.07.The comprehensive cost is reduced by about 8% in the medium and long term application, and the implementation effect is good.

Key words: GA, reverse osmosis membrane, chemical cleaning, polysilicate fouling, H2SO4, demineralized water system, membrane resistance, gained output ratio(GOR)