Sodium-air heat exchanger

Abstract

The invention provides a sodium-air heat exchanger, comprising: a cylinder body, the top of the cylinder body is provided with an outlet damper, and the bottom end is provided with an inlet damper; an upper header, one end of the upper header communicates with the sodium inlet pipe; The lower header, one end of the lower header is connected to the sodium outlet pipe; the heat exchange tube bundle is connected between the upper header and the lower header; the flow distributor is arranged in the central area of ​​the inner cavity of the cylinder; Among them, the sodium inlet pipe and the sodium outlet pipe are arranged on the same side of the cylinder; the upper header and the lower header are ring-shaped, and have pipe joints protruding outward from their surfaces, and the heat exchange tube bundle and the upper header Connect with the lower header through a pipe joint. The sodium-air heat exchanger of the present invention has the advantages of high heat exchange efficiency, small flow resistance, and compact structure by optimizing the design of the header, the connection mode of the header and the heat exchange tube, and the damper.

Description

technical field [0001] Embodiments of the present invention relate to heat exchangers, in particular to a sodium-air heat exchanger. Background technique [0002] The accident waste heat removal system of the pool type sodium-cooled fast reactor is passive. When a reactor accident occurs and the core waste heat cannot be discharged through the main heat transfer system, the reactor waste heat will be discharged through the accident waste heat removal system. The accident waste heat removal system mainly includes other heat exchangers, intermediate loop pipes, sodium-air heat exchangers and draft chimneys, etc. When an accident occurs, other heat exchangers first discharge the core heat to the intermediate loop pipes , and then the intermediate loop pipeline transfers the heat to the sodium-air heat exchanger, and finally the hot air is discharged through the draft chimney through the sodium-air heat exchanger. Among them, the sodium-air heat exchanger can adopt the flow mod...

AI Technical Summary

Problems solved by technology

Commonly used heat exchangers for reactor heat exchange include serpentine finned tube sodium-air heat exchanger with blower (forced circulation), serpentine finned tube natural convection sodium-air heat exchanger, smooth tube spiral tube type sodium - Air heat exchangers, etc. However, the application of these heat exchangers has the following disadvantages: (1) In order to realize natural circulation drive, it is necessary to increase the circulation heat exchange area (mainly involving the number of finned tube layers, etc.), which is easy to cause equipment Large volume, uncompact structure, and increased equipment cost; (2) In order to increase the driving force of natural circulation, the height of the draft chimney needs to be greatly increased, which will bring difficulties to the construction of the factory building, etc.

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