Cuboid sodium-sodium-air integrated heat exchanger

Abstract

The invention relates to the technical field of residual heat removal of reactor accidents, and particularly discloses a cuboid sodium-sodium-air integrated heat exchanger. Tube plates are respectively arranged at the upper end and the lower end of a cylinder body of the heat exchanger; the upper tube plate and the lower tube plate are both vertically provided with a plurality of sodium-air heat transfer tubes; a plurality of sodium-sodium heat transfer tubes with a same inclination angle are arranged between the left side wall and the right side wall of the cylinder body; and a layer of surrounding plate is welded to the outer side wall of the cylinder body, wherein a closed space formed by covering a pipe opening at a higher position of each sodium-sodium heat transfer pipe by the surrounding plate is a primary sodium inlet chamber, and a closed space formed by covering a pipe opening at a lower position of each sodium-sodium heat transfer tube by the surrounding plate is a primary sodium outlet chamber. The heat exchanger is reduced to a sodium-sodium-air heat exchanger, and meanwhile, through a reactor vessel away from high neutron radiation, requirements for radiation resistance, manufacturing and installation requirements are obviously reduced, and heat transfer efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of reactor accident waste heat derivation, and in particular relates to a cuboid sodium-sodium-gas integrated heat exchanger. Background technique [0002] According to the requirements of nuclear safety regulations, when the sodium-cooled fast reactor nuclear power plant fails to discharge heat through the main heat transfer system when the water supply of all steam generators is interrupted, the reactor loses external power supply, and the accident shuts down due to an earthquake, the accident waste heat discharge system The input is used to conduct the remaining heat generation and heat storage of the reactor to the final heat sink (atmosphere), keeping the fuel rods, internals and reactor vessel within acceptable temperature limits. [0003] The accident waste heat removal system usually consists of a sodium-sodium heat exchanger, a sodium-air heat exchanger, a sodium buffer tank, and pipes connecting th...

AI Technical Summary

Problems solved by technology

[0007] (1) Two heat exchangers are required, and the equipment cost is high

[0008] (2) The sodium-sodium heat exchanger is usually installed in the stack container, which is difficult to install, and it is in the environment of high neutron radiation all the year round

[0009] (3) Two sodium natural circulation processes are required, the process is long, the flow resistance is large, and the heat transfer efficiency is low

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