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Nuclear power station secondary circuit pH adjusting method and system

A nuclear power plant secondary loop and adjustment method technology, applied in the field of nuclear power plant secondary loop pH adjustment method and system, can solve problems such as secondary loop structural material corrosion, reduce corrosion and migration of corrosion products, reduce oxygen content, and improve thermal stability Effect

Pending Publication Date: 2022-05-13
GUANGDONG NUCLEAR POWER JOINT VENTURE +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a method and system for adjusting the pH of the secondary loop of a nuclear power plant, aiming to solve the corrosion problem of the structural materials of the secondary loop of the existing nuclear power plant to a certain extent

Method used

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  • Nuclear power station secondary circuit pH adjusting method and system
  • Nuclear power station secondary circuit pH adjusting method and system
  • Nuclear power station secondary circuit pH adjusting method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for regulating the pH of a secondary loop of a nuclear power plant, comprising the following steps:

[0055] Taking Unit 2 of Daya Bay Nuclear Power Plant as the experimental object, the condensate polishing system (ATE system) adopts the configuration of positive bed + mixed bed, the resin filled in the positive bed is Rohm and Haas 1600, and the type of resin filled in the mixed bed is the same. For Rohm and Haas 1600 cation resin and 9000 anion resin. The steam generator sewage system (APG sewage system) adopts the purification method of positive bed + negative bed. The positive bed filling resin in Daya Bay is GRAVER GR-2-0UNG resin, and the negative bed filling is GRAVER GR-1-9UNG resin. pH adjustment system as attached figure 1 As shown, it includes ethanolamine drug delivery system, ammonia water drug delivery system and hydrazine drug delivery system, wherein the ammonia water drug delivery system is administered separately, and the ethanolamine drug d...

Embodiment 2

[0057] A method for adjusting the pH of the secondary loop of a nuclear power plant, the difference from Example 1 is that the concentration of ethanolamine in the feed water of the secondary loop is 2.5 mg / kg through administration of the pH adjusting system.

Embodiment 3

[0059] A method for adjusting the pH of the secondary loop of a nuclear power plant, which is different from Example 1 in that: the concentration of ethanolamine in the secondary loop feed water is 2 mg / kg through administration of the pH adjusting system.

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Abstract

The invention belongs to the technical field of nuclear power station corrosion prevention, and particularly relates to a nuclear power station secondary circuit pH adjusting method and system. According to the method for adjusting the pH value of the secondary loop of the nuclear power plant, ethanolamine, ammonia water and hydrazine are adopted as pH adjusting agents of secondary loop feed water, so that the pH value of the feed water in the secondary loop of the nuclear power plant is 9.7-10 at the temperature of 25 DEG C. According to the method for adjusting the pH value of the secondary circuit of the nuclear power station, the pH value of the secondary circuit is more uniformly distributed through common adjustment of the ethanolamine, the ammonia water and the hydrazine, the pH value of feed water in the secondary circuit of the nuclear power station is 9.7-10 at 25 DEG C, particularly, the MSR hydrophobic pH value can be increased to 9.7, and corrosion of a structural material of the secondary circuit of the nuclear power station can be effectively reduced in the alkaline environment. Particularly, flow accelerated corrosion of a secondary loop and migration of corrosion products are reduced, and the service life of system components is prolonged.

Description

technical field [0001] The application belongs to the technical field of nuclear power plant anticorrosion, and in particular relates to a method and system for adjusting the pH of a secondary loop of a nuclear power plant. Background technique [0002] Corrosion of structural materials in the secondary circuit of a pressurized water reactor (PWR) is a key issue. Internationally, the method of adding ammonia and hydrazine to the secondary circuit is generally adopted to maintain the chemical stability of the secondary circuit, slow down the corrosion of the structural materials of the secondary circuit, and improve the operation safety and reliability of the secondary circuit system. Practical experience shows that ammonia and hydrazine are used as pH regulators in the secondary loop of nuclear power plants, and there are problems such as increased Fe ion concentration in the secondary loop coolant and increased deposits on the secondary side of the steam generator. [0003...

Claims

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Application Information

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IPC IPC(8): C02F1/66C23F11/06
CPCC02F1/66C23F11/06C02F2209/06
Inventor 陈红雨魏双廖军孙其良孙珂
Owner GUANGDONG NUCLEAR POWER JOINT VENTURE
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