Passive residual heat removal system based on annular air cooler

Abstract

The invention discloses a passive residual heat removal system based on an annular air cooler, which comprises at least two independent residual heat removal subsystems and a shared water supplementing tank; each residual heat removal subsystem comprises a heat exchange device consisting of a heat exchange water tank and a heat exchanger; the annular air cooler is composed of a descending cavity,an air cooling pipe, an upper annular header and a lower annular header, and the annular air cooler is provided with an inlet electric valve and an outlet electric valve; hot gas in the gas cooling pipe serves as an ascending section, cold gas in the descending cavity serves as a descending section, and natural circulation flowing heat exchange is formed between the annular gas cooler and the heatexchange device by means of the density difference and the potential difference of the cold gas and the hot gas, so that residual heat in the reactor core is safely and reliably discharged after thereactor core is shut down normally or accidentally; and the temperatures of the fuel cladding, the pressure vessel and the wall surface of the reactor chamber do not exceed the allowable temperature.

Description

technical field [0001] The invention relates to the technical field of nuclear industry cooling systems, in particular to a passive waste heat discharge system based on an annular air cooler. Background technique [0002] After the nuclear reactor shuts down, due to the remaining fission in the core and the decay of fission products, there will be residual heat in the core and last for a long time. The heat of the core will lead to an increase in the temperature of the core fuel and core coolant, resulting in damage or even melting of the fuel elements, resulting in the release of a large amount of radioactive substances and a nuclear safety accident. Therefore, it is necessary to set up a safety-level waste heat removal system to bring the remaining heat in the core to the final heat sink. Different from pressurized water reactors, liquid metal cooled reactors use metals with low melting points as coolants, such as sodium-potassium alloys, lead-bismuth alloys, etc. These l...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing liquid metal cooling reactor system is complicated and has high construction cost, and is not suitable for the miniaturization and compact arrangement of the reactor.

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