A Passive Waste Heat Removal System Based on Annular Air Cooler

Abstract

The invention discloses a passive waste heat discharge system based on an annular air cooler, which includes at least two independent waste heat discharge subsystems and a shared water supply tank, wherein each waste heat discharge subsystem includes: a heat exchange tank and a heat exchanger The heat exchange device composed of the heat exchanger, the annular air cooler composed of the descending chamber, the air cooling pipe, the upper annular header and the lower annular header, and the inlet electric valve and the outlet electric valve of the annular air cooler; The hot gas is used as the ascending section, and the cold gas in the descending chamber is used as the descending section. Depending on the density difference and potential difference of the hot and cold gases, a natural circulation flow and heat exchange are formed between the annular gas cooler and the heat exchange device. After the reactor or accident shutdown, the residual heat in the core can be safely and reliably discharged, and the temperature of the fuel cladding, pressure vessel, and reactor chamber wall does 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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