Cylindrical sodium-sodium-air integrated heat exchanger

Abstract

The invention relates to the technical field of reactor accident after heat removal, and particularly discloses a cylindrical sodium-sodium-air integrated heat exchanger. According to the cylindricalsodium-sodium-air integrated heat exchanger, two layers of tube plates are arranged on the upper end surface and the lower end surface of a cylinder body in the heat exchanger, a plurality of sodium-air heat transfer tubes which are vertically distributed are arranged between the two layers of tube plates, so that a closed secondary side space is defined by the two layers of tube plates, the outerside walls of the sodium-air heat transfer tubes and the inner side wall of the cylinder body, a plurality of sodium-sodium heat transfer tubes are vertically arranged in the secondary side space, the side wall of the upper end of the cylinder body is provided with a primary sodium inlet, the primary sodium inlet is connected to the upper ends of the sodium-sodium heat transfer tubes, the side wall of the lower end of the cylinder body is provided with a secondary sodium outlet, the secondary sodium outlet is connected to the lower ends of the sodium-sodium heat transfer tubes, and the portion, outside the sodium-sodium heat transfer tubes, of the secondary side space is filled with sodium to form secondary side sodium. The heat exchanger is reduced to be a sodium-sodium-air heat exchanger, meanwhile, due to the fact that the heat exchanger is away from a reactor container with high neutron radiation, the requirements for the radiation resistance to equipment, manufacturing and installation are obviously lowered, and the heat transfer efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical field of reactor accident waste heat extraction, and specifically relates to a cylindrical sodium-sodium-gas integrated heat exchanger. Background technique [0002] According to the requirements of nuclear safety regulations, in the case of accident shutdowns caused by all steam generator feedwater interruptions, loss of off-site power to the reactor, or earthquake, the sodium-cooled fast reactor nuclear power plant cannot dissipate heat through the main heat transfer system. The input will be used to transfer the remaining heat and storage of the reactor to the final heat sink (atmosphere) to ensure that the fuel rods, reactor internals and reactor vessels are within acceptable temperature limits. [0003] The accident waste heat removal system usually consists of sodium-sodium heat exchanger, sodium-air heat exchanger, sodium buffer tank, and pipes connecting them. [0004] The sodium-sodium heat exchanger is used to t...

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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