Two-phase flow device for researching enhancement of natural circulation capacity of system

Abstract

The invention provides a two-phase flow device for researching the enhancement of the natural circulation capacity of a system. The two-phase flow device consists of a circulating water system, an air bubble generation device, an air supply system and a data acquisition system, wherein the circulating water system mainly comprises an open type water tank, a filter device, a heat exchanger and other relevant pipelines and valves; the air bubble generation device is a core of the device and consists of an external sleeve and a multiporous medium sleeve; the air supply system mainly comprises an air compressor, an air storage tank and a pressure reducing valve; the data acquisition system mainly consists of an integrated data acquisition system, a high-speed camera system, a gas mass flow meter, an electromagnetic flow meter, a pressure sensor and a temperature sensor. The two-phase flow device can effectively solve the problem of disturbance to a natural circulation system due to active air injection and reduce the additional resistance involved into a circulation loop; the device is simple, easy to operate and uniform in foaming; stable bubble flow can be obtained; the two-phase flow device is favorable for scientific design of natural circulation and two-phase flow and engineering design of a passive safety system.

Description

technical field [0001] The invention relates to a two-phase flow device used for the research on improving the natural circulation capacity of the system, which is applied in the field of nuclear reactor safety cooling system and thermal hydraulic technology. Background technique [0002] As we all know, in a nuclear power plant, most of the systems and equipment of the nuclear steam supply system are arranged in the containment. Therefore, from the perspective of nuclear safety, the integrity of the containment must be guaranteed in any case to prevent radioactive leakage. However, when a loss of water accident occurs in a nuclear reactor or the main steam pipe ruptures, high-temperature and high-pressure water will enter the containment through the breach, and these emissions will turn into water vapor under low-pressure conditions. function, causing pressure and temperature rise in the containment environment, thus threatening the integrity of the containment. Furthermo...

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Problems solved by technology

[0005] Whether it is a microporous needle, a microporous plate, an aerator head or a perforated sleeve, the bubble generating device of the bubble lift pump currently used will inevitably cause a large disturbance to the natural circulation loop, increasing the circulation of the loop. Resistance, which introduces a large frictional pressure drop, is not suitable for this kind of passive containment cooling system that only relies on the principle of natural circulation to operate the flow

In the research on the mechanism of the refrigeration cycle, most of the experimental devices use heat exchangers as the bubble generators. The obvious disadvantage is that it is difficult to control the characteristic parameters of the generated bubbles, such as bubble diameter, gas production, etc., and it is difficult to obtain the flow pattern. Stable bubbly flow with enough bubbles, the lifting effect is not ideal and it is not conducive to system control

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