Long-term efficient passive containment cooling system utilizing jetting technique

Abstract

The invention aims to provide a long-term efficient passive containment cooling system utilizing a jetting technique. A built-in heat exchanger of a containment and upper and lower pipe sections form a first-stage heat discharging system; an air cooler, a water tank baffle plate and a steam-air jet device in an external water tank form a second-stage heat discharging system of a cooling system; the steam-air jet device is located on the side wall surface of a gas space in the water tank and is used for introducing water steam produced by virtue of the first-stage heat discharging system into an ejector to jet air of the second-stage heat discharging system, so as to decrease the inlet temperature of the first-stage heat discharging system, so that the heat discharging efficiency of the system is improved; and a passive containment heat exchanger adopts an intensified heat exchange pipe and is located in the containment, the heat exchange pipe adopts a small-coil-pipe light pipe, and drainage plates are mounted on the periphery of the heat exchanger. According to the long-term efficient passive containment cooling system, when a crevasse accident occurs at a main cooling agent loop or a main steam pipeline, the internal heat in the containment can be efficiently taken away in a long term, so that the internal temperature and pressure of the containment can be below safety limit values for a long time under accident conditions.

Description

technical field [0001] The invention relates to a nuclear safety device, in particular to a containment cooling system. Background technique [0002] With the continuous development and maturity of nuclear energy technology, the application of nuclear energy is playing an increasingly important role in the survival and development of human beings. In order to make full use of this clean and efficient energy to alleviate environmental pressure, my country is currently actively developing technologies such as land nuclear power plants, floating nuclear power plants, and nuclear-powered icebreakers. [0003] In the process of updating nuclear energy technology, nuclear safety has always been at the top of the list. Generally, a nuclear energy system has three safety barriers: nuclear fuel pellets and cladding, primary circuit pressurized boundary, and nuclear power plant containment. As the last safety barrier isolated from the outside world, the containment vessel has attrac...

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Problems solved by technology

[0005] However, during the operation of the above system, the water in the tank will be continuously heated and evaporated, and the water stored in the tank can only maintain the system for 72 hours, and related studies have shown that the heat transfer coefficient outside the tube of the passive containment heat exchanger is much lower than that of the inside tube. Thermal coefficient, low steam condensation efficiency hinders heat export in containment (Jeon, B.G., NO, H.C., 2014. Thermal-hydraulic evaluation of passive containment cooling system of improved APR+during LOCAs. Nuclear Engineering and Design 278, 190-198)

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