Heat exchanger for passive residual heat removal system

摘要

Disclosed is a heat exchanger for a passive residual heat removal system, which improves heat transfer efficiency by expanding a heat transfer area. A heat exchange tube includes a first member connected to a steam pipe through which steam generated from a steam generator of a nuclear reactor circulates, and a second member connected to both of the first member and a feed water pipe used to supply water to the steam generator provided in the nuclear reactor, and the first member has the shape different from that of the second member, thereby expanding the heat transfer area so that the heat transfer efficiency is improved.

主权项

1. A heat exchanger for a passive residual heat removal system to cool a core of a nuclear reactor, the heat exchanger comprising:
an emergency cooling tank in which water is received; a housing disposed inside the emergency cooling tank, the housing including an upper portion and a lower portion, wherein an exhaust port is formed in the upper portion of the housing, and through holes are formed at the lower portion of the housing; and a heat exchange tube disposed inside the housing, wherein the heat exchange tube includes a first member positioned corresponding to the upper portion of the housing and a second member positioned corresponding the lower portion of the housing, the first member being connected to a steam pipe through which steam generated from a steam generator of the nuclear reactor circulates, and a second member connected to both of the first member and a feed water pipe used to supply water to the steam generator provided in the nuclear reactor, and the first member has a shape different from that of the second member, and wherein the water is filled to a level of the lower portion of the housing and flows between the emergency cooling tank and the housing through the through holes, and air is filled above the water, so that the steam flowing the first member is air-cooled and the steam flowing the second member is water-cooled.