An Auxiliary Heating System for Liquid Metal Cooled Natural Circulation Reactors

Abstract

The invention discloses an auxiliary heating system for a liquid-metal-cooled natural circulation reactor. The auxiliary heating system comprises a nitrogen storage tank (1), a filter (2), a gas heater (3), a hot nitrogen input pipe (4), a main container (5), a safety container (6), gas extractors (7), pipelines and valves, wherein the pipelines and the valves are used for interconnecting devices. The system has the advantages that the function that a liquid-metal coolant in a liquid metal pool type reactor is subjected to auxiliary heating from the outside of the main container of the reactor is realized, the system is simple in structure, components in the reactor are not required for being added or started during operation, so that liquid metal in the main container can form micro natural circulation after the operation of the system, and meanwhile, the reliability and safety of the reactor can be effectively improved.

Description

technical field [0001] The invention relates to a liquid metal heating system, in particular to an auxiliary heating system for a liquid metal cooling natural circulation reactor. Background technique [0002] The liquid metal cooling pool type natural circulation reactor uses liquid metal as the coolant. When the power of the reactor is very low, the heat generated by the core will not be enough to maintain the temperature of the liquid metal coolant in the main circuit above the melting point. Once the coolant freezes, it will cause serious damage to the system and equipment of the reactor body. Therefore, when the reactor power is low, the liquid metal coolant must be heated to maintain it in a liquid state. [0003] At present, the auxiliary heating system of the liquid metal reactor mainly has the following methods: [0004] One of the methods is the same as the auxiliary heating method of the China Experimental Fast Reactor. The secondary circuit and the intermediate...

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Problems solved by technology

However, the heating device in this way is installed in the main container, which not only increases the complexity of the reactor structure, but also makes system inspection and maintenance inconvenient

[0006] In addition, the gas heating system adopted by China Experimental Fast Reactor uses argon gas to preheat the main vessel, the internal equipment components of the main vessel and the reactor safety vessel before filling the main vessel with sodium. That reactor can't play the role of auxiliary heating after shutdown

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