A passive containment heat export system

Abstract

The invention belongs to the technical field of nuclear safety control, and relates to a heat removing system for a passive containment system. The heat removing system comprises a containment and a heat removing component, wherein the heat removing component comprises an external coolant liquid tank for the containment, a circulating pipeline, a heat exchanger unit, a mixed gas honeycomb duct and an air retention box; the heat-exchanger unit is arranged in the containment and comprises a heat exchanger tube, a coolant liquid inlet for the heat-exchanger unit and a coolant liquid outlet for the heat exchanger unit; the circulating pipeline is divided into two sections; the external coolant tank for the containment is arranged outside the containment, and the arranging position of the coolant liquid tank is higher than that of the heat exchanger unit; the mixed gas honeycomb duct is arranged in the containment; two ends of the mixed gas honeycomb duct are opened, and at least one section of the mixed gas honeycomb duct makes contact with at least one section of the heat exchange tube through a contact face; the air retention box is arranged in a lower space of the containment and is provided with an opening hole. By using the heat removing system disclosed by the invention, the heat removing efficiency of the passive containment system can be improved by improving the condensation and heat transfer efficiency.

Description

technical field [0001] The invention belongs to the technical field of nuclear safety control, and relates to a passive containment heat derivation system. Background technique [0002] The containment vessel is the last barrier to prevent the release of radioactive fissile material in a PWR nuclear power plant, and ensuring the integrity of the containment vessel is of paramount importance in the design of a nuclear power plant. Traditional PWR nuclear power plants use an active containment sprinkler system to control the containment pressure and temperature under various accident conditions, so as to maintain the integrity of the containment. [0003] However, in the event of a beyond design basis accident such as loss of off-site power, the active containment sprinkler system cannot work. Therefore, in recent years, more and more new reactor designs have adopted passive technology to remove the heat inside the containment vessel. For example, the AP600 / 1000 reactor deve...

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Problems solved by technology

[0004] However, when there are non-condensable gases (such as air and hydrogen, carbon monoxide, etc. that may be produced during severe accidents) in the mixed gas in the containment vessel, the condensation heat transfer ability of water vapor will be severely weakened

Some data show that for a mixture of water vapor and air, when the air mass fraction is only 0.5%, the condensation heat transfer coefficient under natural convection conditions will be reduced by 50%.

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