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Method for cleaning continuous electric demineralizer

A technology of electrostatic desalination and cleaning box, applied in separation methods, chemical instruments and methods, semi-permeable membrane separation, etc., can solve problems such as hardened organic and biological pollutants, achieve good effect and simple operation

Active Publication Date: 2015-02-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, studies have shown that low pH cleaners can harden organic and biological contaminants

Method used

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  • Method for cleaning continuous electric demineralizer
  • Method for cleaning continuous electric demineralizer

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Experimental program
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Embodiment Construction

[0037] From January 11th to January 22nd, 2012, NaCl / NaOH cycle cleaning was carried out for the 2#CEDI system of the boiler feed water treatment system for the Taiyuan Iron and Steel 2×300MW unit. 2#CEDI has been in operation for three years, the operating voltage has been increased from the initial 120V to 270V, and the electrical reduction effect is not very obvious. According to the actual configuration of the cleaning system on site, formulate the following plan:

[0038] 1. Configure 4000L of cleaning liquid chemicals and other cleaning materials:

[0039] .

[0040] 2. Cleaning method:

[0041] Flush the pipeline until it is clean, and replace the filter element with a new security filter. Do not power the membrane stack during the cleaning process.

[0042] a. Cleaning flow

[0043] .

[0044] b. Cleaning steps:

[0045] 1. Prepare 5% (mass percentage) NaCl solution (200Kg), flush the CEDI membrane stack, and discharge while flushing. The flow rate of produc...

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Abstract

The invention relates to a method for cleaning a continuous an electric demineralizer, and belongs to the technical field of boiler feed water treatment. The method includes four processes of system washing, washing with a sodium chloride solution, circular washing with a sodium chloride / sodium hydroxide mixed solution, and reduction for standby application. The method has the characteristics as follows: organic and biological pollutants in a CEDI (Continuous Electrodeionization) membrane stack are removed by a high-pH cleaning solution; before the high-pH cleaning solution circulates, a neutral NaCl solution is used for washing a resin, and hardness ions in the resin are removed, so that the ions are prevented from precipitating in the high-pH cleaning solution; and the phenomenon that the organic and biological pollutants are hardened when a low-pH cleaning agent is used for removing the hardness ions in the past is avoided; and a CEDI system is cleaned with a mixed solution of 5% sodium chloride and 2% sodium hydroxide, the operation is simple, and the effect for removing the organic and biological pollutants is good.

Description

technical field [0001] The invention belongs to the technical field of boiler make-up water treatment. In particular, it relates to a cleaning method for a continuous electric desalination device. Background technique [0002] The 2×300MW generator set is equipped with a boiler feed water treatment system, which adopts the full-membrane water production process of microfiltration + first-stage reverse osmosis membrane + second-stage reverse osmosis membrane + CEDI to desalinize the raw water so that the final water can reach the standard of desalinated water. CEDI is a continuous electric desalination device. Under the action of direct current, the positive and negative ions move in a directional manner, pass through the semi-permeable membrane, and finally remove the salt in the water. Using CEDI for deep desalination of RO (reverse osmosis) product water can achieve high-purity water quality (silicon dioxide ≤ 20μg / L, conductivity ≤ 0.2μS / cm). [0003] The CEDI membrane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/06C02F1/469
Inventor 李鹏飞韩兴国姚克明武海龙王瑞红
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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