关键词: 电除盐（EDI）, EDI膜组件, 污堵, 清洗装置, 逆流清洗

Abstract: Recently, the electric demineralizer (EDI) technology has been gradually applied in the water treatment systems of power plants. It is becoming urgent to solve the issue of blockage and cleaning of EDI modules. This paper introduces the operation mechanism and infrastructure of EDI, analyzes the major cause contributing to deposit block, then puts forward corresponding design for cleaning and presents the development of an offline cleaning device for EDI modules. From the on-site application it is observed that by taking advantage of this device backwash cleaning can be conducted with better performance over the traditional cleaning. The offline chemical cleaning in combination with backwash cleaning achieves good effects. Specifically, the output of membrane modules is improved by over 60% after cleaning.

Key words: electric demineralizer (EDI), EDI module, fouling, cleaning equipment, backwash cleaning