Sodium-cooled fast reactor steam generator and superheater heat transfer tube steam-water side chemical cleaning system

Abstract

The invention discloses a sodium-cooled fast reactor steam generator and superheater heat transfer tube steam-water side chemical cleaning system. An outlet of a chemical preparation box communicateswith an inlet of a chemical distribution pump, an outlet of the chemical distribution pump is divided into two paths, one path of the two paths communicates with an inlet of the chemical preparation box through a return valve, the other path communicates with a water inlet of a cleaning box, a desalted water source communicates with an inlet of the cleaning box and the inlet of the chemical preparation box, a nozzle is arranged in the cleaning box, a steam source communicates with the nozzle, an outlet of the cleaning box is divided into two paths, one path of the two paths communicates with an inlet of a cleaning flow meter through a cleaning pump, the other path communicates with an inlet of the cleaning flow meter through a monitoring pipe and a monitoring pipe flow meter, an outlet ofthe cleaning flow meter is divided into two paths, one path of the two paths communicates with a waste water collecting box through a drain valve, and the other path communicates with the inlet of thecleaning box through a steam generator, a superheater and a chemical sampling device in sequence. The system can achieve chemical cleaning of an evaporator and the superheater in a sodium-cooled fastreactor unit.

Description

technical field [0001] The invention belongs to the field of chemical cleaning of nuclear power plants, and relates to a chemical cleaning system for the steam-water side of a sodium-cooled fast reactor steam generator and a heat transfer tube of a superheater. Background technique [0002] Chemical cleaning technology has been widely used in thermal power plant water supply pipelines, main steam pipelines, and important equipment of water-cooled walls, and has achieved very good economic and safety benefits. Chemical cleaning is an important means to remove all kinds of sundries left in the pipeline of power plant system during the process of manufacturing, transportation, installation, etc., improve the cleanliness of equipment, and prevent corrosion damage of equipment during operation. It is an important step before the unit is put into operation. The steam generator / superheater of the sodium-cooled fast reactor is one of the core equipment of the sodium-cooled fast reac...

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Problems solved by technology

The steam generator / superheater of the sodium-cooled fast reactor is one of the core equipment of the sodium-cooled fast reactor nuclear power plant. The material of the heat exchange tube is chrome-molybdenum steel 2.25Cr1Mo. The working condition is similar to that of some thermal power water walls, and the medium is high temperature and high pressure superheating Steam, with high steam parameters, the evaporator and superheater face a higher risk of corrosion product deposition and fouling, but there is no precedent for chemical cleaning of the evaporator / superheater of a sodium-cooled fast reactor unit

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