High-temperature sodium heat-convection test loop

Abstract

The invention provides a high-temperature sodium heat-convection test loop comprising a main loop system, a sodium storage tank, a sodium feeding and discharging system, a covering air purifying and vacuum system, a sampling tank and a temperature control system, wherein a sodium sampling port is additionally arranged between the bottom of a high-temperature test section and a sodium feeding valve, an empty pipe with a sodium steam heat blocking valve is additionally connected between a sealing cover plate at the bottom of the sampling tank and the high-temperature test section, a cooling pipeline is wound on the outer wall of the empty pipe, an opening at the top of the sampling tank is additionally provided with a sample converter, and a vacuum gate valve is installed between the sampleconverter and the opening at the top of the sampling tank. The high-temperature sodium heat-convection test loop can discharge sodium with higher impurity content in the loop, be filled with new sodium with higher purity, can keep the air tightness of the loop, ensure the full aperture smoothness of the operation channel of an air-phase test space and simultaneously carry out the corrosion tests of the sodium and sodium steam; and the sampling tank can accomplish the sampling and discharging operation of a sample under the protective atmosphere of argon to be free of air pollution all the time.

Description

technical field [0001] The invention belongs to the field of material corrosion, and in particular relates to a high-temperature sodium heat convection test circuit. Background technique [0002] Structural materials will be corroded in metallic sodium with high impurity content, threatening the safety and service life of structural components. Therefore, when sodium metal is used as a coolant for fast neutron reactors, in addition to proper handling of sodium, it is also necessary to conduct compatibility tests between its structural materials and high-temperature sodium. The high-temperature sodium heat convection test circuit can effectively simulate the working conditions of such structural materials, so as to obtain high-temperature sodium corrosion performance data of structural materials, so as to ensure the integrity and safe operation of system components. [0003] In the prior art, in the article "High Temperature Sodium Heat Convection Test Circuit" published by ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, in the article "High Temperature Sodium Heat Convection Test Circuit" published by Long Bin et al., a high temperature sodium heat convection test circuit is disclosed. The technical problems in this circuit are: 1. When the circuit is repeatedly After the test, the impurity content of sodium in the circuit is high, and it is not easy to purify again, and the old sodium cannot be discharged into the sodium storage tank, which will pollute the sodium storage tank. The only way to discard the entire circuit body and circuit sodium is to replace it with a new one. The circuit body, which is complicated to operate and consumes a lot of materials

2. The upper end of the high-temperature test section is directly connected to the sealing cover of the sampling box. The high-temperature sodium vapor will directly approach the rubber sealing ring of the sealing cover. In order to prevent the damage of the airtightness of the sealing ring, forced water cooling must be adopted outside the upper end of the high-temperature test section. , but such a structure will cause the upper end of the test channel to be blocked by frozen sodium, which makes it very difficult to take and place the sample. At the same time, the gas phase material test space is also blocked by frozen sodium, making it impossible to conduct gas phase tests.

3. The cover above the sampling box needs to be opened when the sample is taken and placed. In order to reduce the air pollution of the sampling box, it needs to be vacuumed and filled with argon many times, and the operation is very cumbersome.

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