Off-line cleaning device for a counter-current electrostatic desalination membrane block

Abstract

The invention discloses a counter flow type offline cleaning device of an electrodeionization membrane block. The counter flow type offline cleaning device comprises a solution box with a heater, wherein a water outlet and a reflowing inlet are formed in the solution box, the water outlet of the solution box is connected with a water inlet which are movably connected with a water producing hole and a thick water discharging hole of the electrodeionization membrane block; the water inlet pipe is provided with a flowmeter and a flow regulating valve; a reflowing branch pipe which are used for being movably connected with a water inlet and a thick water replenishing hole of the electrodeionization membrane block is connected to the reflowing inlet of the solution box, a reflowing control valve is arranged on the reflowing branch pipe, and a blow down branch pipe with a blow down control valve is arranged at the inlet of the reflowing control valve. According to the counter flow type offline cleaning device, the system output can be recovered, the cleaning condition of the electrodeionization membrane block can be conveniently controlled, and a large batch of electrodeionization membrane blocks are cleaned within a short time on the premise of no influence on normal operation of a unit.

Description

technical field [0001] The invention belongs to the technical field of water supply and waste water treatment, and in particular relates to an off-line cleaning device for a countercurrent type electric desalination membrane block. Background technique [0002] Electric desalination technology is a new separation process formed by the organic combination of electrodialysis and ion exchange. It can be used not only for the production of ultrapure water, but also for the desalination and softening of drinking water and industrial water, as well as the resource recovery and standard treatment of heavy metal wastewater. . With the continuous promotion and application of electric desalination technology in the chemical boiler feed water treatment system of power plants, some power plants have gradually exposed some problems in the application process of electric desalination, such as fouling of membrane blocks, deterioration of product water quality, decline in output and Diffic...

AI Technical Summary

Problems solved by technology

With the continuous popularization and application of electric desalination technology in the chemical boiler feed water treatment system of power plants, some power plants have gradually exposed some problems in the application process of electric desalination, such as fouling of membrane blocks, deterioration of product water quality, decline in output and Difficult to recover, etc.

[0003] The main reasons for the fouling of the electrostatic desalination device are mechanical blockage caused by particulate impurities, fouling of the concentrated water chamber and cathode chamber caused by high hardness of the incoming water, organic pollution caused by bacterial growth, and irreversible damage to the membrane block caused by oxidizing substances

Different types of fouling will cause apparent problems such as reduced flow rate of product water or concentrated water, and lower effluent quality. Due to the precise structure of the electrostatic desalination membrane module and the high requirements for cleaning media inside the module, there is a lack of corresponding membrane module cleaning technology. In this case, the entire membrane module may be discarded, and the cost is extremely high

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