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Resin regeneration and post-flushing method of steam generator drainage sewage purification system in nuclear power station

A steam generator and purification system technology, applied in chemical instruments and methods, ion exchange regeneration, chemical/physical processes, etc., can solve the problems of sewage water quality deviation, long flushing time, unavailable system backup series, etc., to reduce Regeneration water consumption, significant residual effect, and shortening of regeneration flushing time

Inactive Publication Date: 2017-02-15
JIANGSU NUCLEAR POWER CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) After regeneration, the flushing time is long and the water consumption is large. During the regeneration period, the backup series of the system is unavailable
[0007] (2) After the flushing after regeneration reaches the set value, the residual regeneration liquid can still be detected at the outlet of the resin bed, and there is a risk that the regeneration liquid will enter the secondary circuit and cause the water quality of the steam generator blowdown of the power station to deviate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Step 1. Regeneration of cation resin: enter the cation resin bed with desalted water at a flow rate of 1.8-2.0kg / s, and at the same time dilute 60% nitric acid to 50-55g / L and enter the cation resin bed together with desalinated water, and pass through the cation resin The hydrogen ions in the regeneration liquid exchange the impurity ions adsorbed by the cation resin during operation. In the supply of 60% concentration of nitric acid about 0.7m 3 After that, the regeneration work ends.

[0046] Step 2. Rinse after regeneration of the cation resin: After stopping the regeneration solution, continue to use desalted water at a flow rate of 1.8-2.0kg / s to enter the cation resin bed to wash the exchanged impurity ions until the pH of the outlet of the cation resin bed is greater than 6 , the flushing ends after the cation resin is regenerated.

[0047] Step 3, anion resin regeneration: use desalted water at a flow rate of 1.7-2.5kg / s to enter the anion resin bed, and at t...

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Abstract

The invention belongs to the technical field of nuclear power station sewage purification, in particular relates to a resin regeneration and post-flushing method of a steam generator drainage sewage purification system in a nuclear power station. The defects in the prior art are overcome, the regeneration and post-flushing time of resin in the steam generator drainage sewage purification system is shortened, and the residual amount of regeneration liquid after a resin bed is flushed is reduced, and it is ensured that the residual regeneration liquid is not introduced into system after the resin regeneration process. The method comprises the following steps: step 1, regenerating cation resin; step 2, performing flushing after the cation resin is regenerated; step 3, regenerating anion resin; step 4, performing combined flushing.

Description

technical field [0001] The invention belongs to the technical field of sewage purification in nuclear power plants, and in particular relates to a washing method after resin regeneration in a steam generator sewage purification system of a nuclear power plant. Background technique [0002] Each unit of the nuclear power plant is equipped with a set of steam generator purification system, which is used to purify the mechanical impurities in the steam generator sewage and the soluble salt infiltrated due to poor seal of the condenser. Chemical conditions. [0003] The steam generator sewage purification system is equipped with two series of resin beds (each series is equipped with a mechanical bed, a positive bed and a negative bed). During the normal operation of the unit, one series is in operation and the other is in standby. [0004] When the operating parameters of the resin bed outlet exceed the fixed value, the system will exit the operation for regeneration. After a ...

Claims

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Application Information

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IPC IPC(8): B01J49/00
Inventor 陆元志李锋张毅李连海王伟任校江王旭初赵怀阔
Owner JIANGSU NUCLEAR POWER CORP
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