Passive residual heat removal heat exchanger testing device

Abstract

The invention relates to a passive residual heat removal heat exchanger testing device which comprises a heat transfer testing section, a voltage stabilizer, a shield pump, a heater, a circulation pump, a heat exchanger, a high-level water tank, a low-level water tank, a lifting pump, a water supplying pump and a spraying pump, wherein the heat transfer testing section, the voltage stabilizer, the shield pump, and the heater form a main loop system of the testing device; the heat transfer testing section comprises 3 C-shaped heat transfer pipes and a cooling water tank; the voltage stabilizer is connected with an outlet pipeline of the heat transfer testing section and an inlet pipeline of the shield pump; the shield pump is connected with the outlet pipeline of the heat transfer testing section; the flowing amount of a main loop is adjusted by adjusting a valve and a bypass valve in front of the shield pump; the heater is arranged between the shield pump and the heat transfer testing section. According to the device, the forms, sizes and materials of the heat transfer pipes are designed reasonably, so that the stress deformation problem can be reasonably avoided, the water use amount can also be greatly reduced, the heat transfer process can be simulated relatively accurately, and relatively accurate heat transfer data can be obtained.

Description

technical field [0001] The invention specifically relates to a test device for a passive waste heat discharge heat exchanger. Background technique [0002] Passive waste heat removal heat exchanger (PRHR HX) is an emergency core cooling system in AP1000 of the third-generation pressurized water reactor nuclear power plant, which plays an important role in alleviating heat sink loss accidents. The passive waste heat removal heat exchanger is mainly composed of heat transfer tubes and refueling water tanks in the containment. The fluid in the hot section of the reactor coolant system flows into the heat transfer tubes and is cooled by the water in the refueling water tank, thereby removing the decay heat of the core. Due to the density difference between the coolants of different temperatures, a natural circulation is formed in the heat exchanger. [0003] The two-phase flow heat transfer phenomenon of the passive waste heat removal heat exchanger in the natural circulation ...

AI Technical Summary

Problems solved by technology

In the test device established by Westinghouse, the heat transfer tube only includes the vertical section, and the heat transfer test of the horizontal section cannot be carried out on this device.

At the same time, the heat transfer tube of the test device is made of 304 stainless steel tube, while the material of the heat transfer tube in AP1000 is Inconel 690. The thermal conductivity difference between the two materials is about 34%, which will affect the heat transfer test data. affect the accuracy and reliability of

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