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Chemical cleaning method for insoluble scale of evaporator of boron recycling system of nuclear power station

A technology of chemical cleaning and insoluble scale, applied in the directions of flushing, cleaning heat transfer devices, metal material coating processes, etc., can solve the problems of stress corrosion, pitting corrosion and corrosion under scale, affecting the evaporation capacity of equipment, etc., and achieve extended use. effect of life

Pending Publication Date: 2019-10-15
HANGZHOU GUANJIE IND CLEANING WATER TREATMENT TECH +1
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Problems solved by technology

[0004] Scaling will affect the evaporation capacity of the equipment, and it is easy to cause stress corrosion, pitting corrosion and under-scaling corrosion, which will affect the service life of the equipment

Method used

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  • Chemical cleaning method for insoluble scale of evaporator of boron recycling system of nuclear power station

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Embodiment Construction

[0026] Analysis of the components of the evaporator scale sample: Judging from the weight composition, the main components are roughly 60% calcium hydrogen phosphate, 21% acid insoluble matter, about 15% magnesium phosphate, and the balance is other impurities.

[0027] According to the material of the equipment is stainless steel, because there are some acid-insoluble substances (insoluble scale), which affect the descaling time and descaling rate. In the selection of cleaning agents, we use more than 20 kinds of cleaning agents and additives. After many scale dissolution experiments. It is determined to use GJ-2E rust and scale remover that is basically non-corrosive to stainless steel, compounded with GJ-insoluble scale and chelating cleaner as the main detergent for cleaning and descaling, and then passivate the pre-film with a higher concentration of oxidizing inorganic acid Chemical cleaning pre-film method.

[0028] Chemical cleaning consists of an evaporator system co...

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Abstract

The invention discloses a chemical cleaning method for insoluble scale of an evaporator of a boron recycling system of a nuclear power station. The method comprises the following steps of S101, screening of a compound cleaning agent; S102, cleaning; S103, pollution discharge and flushing; and S104, passivating. According to the cleaning method disclosed by the invention, scale in the evaporator can be removed, the evaporation capacity of the evaporator is prevented from being influenced by the scale, and the service life of the evaporator is prolonged.

Description

technical field [0001] The invention relates to an evaporator cleaning method, in particular to a chemical cleaning method for refractory scale in an evaporator of a boron recovery system in a nuclear power plant. Background technique [0002] The boron return evaporator of the nuclear power plant is used in the boron return waste liquid treatment system. The waste liquid system is used to treat radioactive waste liquid, so that the radioactivity of the evaporated secondary steam condensate meets the national discharge standards. The volume of the evaporated residue after evaporation is greatly reduced, and it is stored after solidification treatment, thereby reducing the storage volume of radioactive waste. The evaporator is mainly composed of a heating chamber and a separation chamber, also known as an externally heated evaporator. [0003] The boron return evaporator of the waste liquid treatment system of Qinshan Nuclear Power Plant No. 1 has been in operation for more...

Claims

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Application Information

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IPC IPC(8): F28G9/00C23C22/73
CPCC23C22/73F28G9/00
Inventor 黄冠土张云华付勇周国玺
Owner HANGZHOU GUANJIE IND CLEANING WATER TREATMENT TECH
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