System and method for testing performance of blowdown ionization desalination membrane stack of steam generator

Abstract

The invention discloses a system and a method for testing the performance of a blowdown ionization desalination membrane stack of a steam generator. An outlet sampling pipeline of a raw water tank isconnected with a cation exchange bed; a water inlet pump is arranged between the outlet of the cation exchange bed and the ionization desalination membrane stack; fresh water and concentrated water respectively flow from an outlet of the ionization desalination membrane stack; the fresh water at the outlet of the ionization desalination membrane stack flows back to the raw water tank through a return pipeline, and the concentrated water at the outlet of the ionization desalination membrane stack can be discharged according to test requirements or flows back to the raw water tank through the return pipeline; a dosing pump is arranged on the return pipeline; and a pressure relief valve is arranged on an inlet pipeline of the ionization desalination membrane stack to prevent overpressure of inflow water of the ionization desalination membrane. The testing system provided by the invention can provide a stable test medium according to the requirements of water quality, flow and temperature,and flexibly adjust the recovery rate of the ionization desalination membrane stack; and the water quality change trend of a loop and the balance state of the membrane stack can be accurately obtained without offline or online ion chromatographic measurement.

Description

technical field [0001] The invention belongs to the test verification technology of nuclear power plant equipment, in particular to the test field of a steam generator blowdown system. Background technique [0002] The sewage system of the steam generator of the nuclear power plant adopts the continuous ionization desalination (EDI) process instead of the traditional ion exchange process to treat the sewage. Significant advantages such as low waste generation. Compared with the EDI membrane stack used in conventional industrial water treatment, the steam generator sewage has a higher temperature and contains a higher concentration of alkalizing agent, which has a greater challenge to the performance and life of the EDI membrane stack, and interferes with the EDI performance test and the Evaluation, how to assess whether the EDI membrane stack meets the performance requirements of steam generator sewage purification, requires a set of test methods and devices that can effect...

AI Technical Summary

Problems solved by technology

[0003] Since the high concentration of alkalizing agent increases the conductivity value of the background solution, while the concentration of impurity ions to be removed in the sewage is only at the ppb level, whether the resin in the EDI membrane stack has reached equilibrium with the anions and cations in the sewage can be directly measured by online measurement of the loop water conductivity. The rate cannot be realized, but if the sampling test is passed, considering that the water sample analysis takes a certain time, the balance progress cannot be judged in a timely manner, and if the online ion chromatography is used, the test cost will increase greatly. The test method and device for desalination membrane stack performance provide a timely, effective, stable and economical online monitoring method and means to solve this technical problem

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