Liquid lead bismuth alloy-inert gas two-phase flow void fraction measuring device and method based on differential pressure method

Abstract

The invention discloses a liquid lead bismuth alloy-inert gas two-phase flow void fraction measuring device and method based on differential pressure method. The liquid lead bismuth alloy-inert gas two-phase flow void fraction measuring device comprises a loop formed by sequentially communicating a gas-liquid two-phase flow ascending section, a horizontal gas-liquid separation section, a single-phase liquid descending section and a single-phase liquid horizontal section; the gas-liquid two-phase flow ascending section is provided with a gas injection port, the gas-liquid two-phase flow ascending section is divided into a plurality of measuring sections, and the pressure difference of each section is measured through a differential pressure gauge; the single-phase liquid descending sectionis provided with an electromagnetic flowmeter; a gas discharge valve is arranged at the upper part of the horizontal gas-liquid separation section; compressed inert gas is stored in a high-pressure gas storage tank, a gas pressure reducing valve at the top of the high-pressure gas storage tank is controlled to adjust the flow of gas injected through a gas injection port, and a gas flowmeter is used for recording the flow amount of the inert gas; the average void fraction of the gas-liquid two-phase flow ascending section is obtained by measuring the pressure difference of the gas-liquid two-phase flow ascending section and then calculating. The liquid lead bismuth alloy-inert gas two-phase flow void fraction measuring device has the advantages of small disturbance on flow amount measurement, high measurement precision, simple overall structure, easy processing and low cost.

Description

technical field [0001] The invention relates to the technical field of liquid metal testing, in particular to a measuring device and method for cavitation fraction of lead-bismuth alloy-gas two-phase flow in a liquid lead-bismuth alloy circuit. Background technique [0002] The lead-cooled fast reactor is considered to be the fourth generation nuclear energy system that is expected to be the first to achieve industrial demonstration and commercial application. Liquid lead-bismuth alloy has high boiling point, high density, chemical inertness, excellent heat transfer performance and neutron energy spectrum, and is one of the preferred coolants for lead-cooled fast reactors. In addition, the liquid lead-bismuth alloy has a strong natural circulation ability due to its good thermal expansion. For lead-based reactors, it can be designed as a passive waste heat removal system that completely relies on natural circulation under accident conditions. Bubble pump devices are widely...

AI Technical Summary

Problems solved by technology

Liquid lead-bismuth alloy has a high melting point (125°C), so it operates at a high temperature, and is opaque, making it difficult to measure by direct observation

Electrical capacitance tomography uses the different dielectric constants and fractions of the gas-liquid two-phase, and uses the measured information to reconstruct the flow field of the two-phase flow, which can obtain the phase distribution information of the pipeline section without disturbing the flow field. At this stage, its technology is still difficult to use for fine void fraction measurement

The probe method has the advantages of fine measurement and fast response, and can also be used for the measurement of bubble velocity and phase interface concentration, etc., but the probe needs to be inserted into the flow channel, which will inevitably affect the flow

The ray method is a non-contact measurement method with high stability. It is often used to measure the void fraction under high temperature and high pressure. However, the ray is radioactive, and its storage and use conditions are relatively high, and there are safety hazards. Ray emission is not stable, so measurement accuracy is limited

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