Experiment device for measuring heat transfer properties of high-rayleigh number fusion tank

Abstract

The invention relates to an experiment device for measuring heat transfer properties of a high-rayleigh number fusion tank. The experiment device is a 1 / 4-circle two-dimensional slice structure based on a lower end socket of an ACP1000 reactor pressure vessel in a proportion of 1 to 1 and comprises a lower end socket of a fusion tank, an external cooling channel and an upper cover plate, wherein the external cooling channel is welded to the outer side of the round-arc wall surface of the lower end socket of the fusion tank and is used for providing external compelled cooling through cooling water; and the upper cover plate is fixed at the upper part of the lower end socket of the fusion tank and is used for supplying border conditions of heat insulation and cooling. By virtue of thermocouples distributed in the fusion tank and on the round-arc wall surface, the temperature field distribution in the fusion tank and the wall heat flux density distribution condition can be obtained; and by virtue of multipoint thermocouples distributed on the inner side of the round-arc wall surface of the fusion tank, the hard shell distribution property in the fusion tank can be obtained. According to the experiment device, important basis is provided for the safety research on serious accidents of nuclear power plant reactors.

Description

technical field [0001] The invention relates to the technical field of research on the heat transfer characteristics of a head melting pool under a severe accident in a nuclear power plant, in particular to an experimental device for measuring the heat transfer characteristics of a melting pool with a high Rayleigh number. Background technique [0002] When a serious accident occurs in a nuclear power plant pressurized water reactor, if the core cannot be effectively cooled, the temperature will rise rapidly, causing a large number of fuel assemblies and structural materials to melt and migrate to the bottom of the pressure vessel, and the high-temperature melt entering the lower head will gradually accumulate A fragment bed or melting pool lower head is formed, which continuously transfers decay heat to the wall of the lower head. When the decay heat cannot be fully exported, the melting pool will heat the wall of the lower head to a very high temperature, seriously threaten...

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Problems solved by technology

However, due to the limited volume of the experimental section, the layout of heating wires and temperature measuring points is limited, and the temperature field of the melting pool cannot be obtained intuitively, and the Rayleigh number is still relatively small compared with the reactor level. In addition, the upper cover plate is designed for heat insulation. Cannot carry out comparative study of upper cooling boundary conditions

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