Breach Simulation System with Function of Measuring Two-Phase Discharge Flow and Its Measurement Method

Abstract

The invention discloses a crevasse simulation system with a two-phase discharge flow measurement function and a measurement method thereof. The crevasse simulation system comprises a crevasse discharge simulation pipeline, a steam-water separator, a steam measurement pipeline and a weighing measurement pipeline, and the steam-water separator is provided with a two-phase inflow hole, a steam outlet and a liquid phase outlet; the upstream of the crevasse discharge simulation pipeline is connected with a crevasse of a high-temperature high-pressure thermal hydraulic loop, and the downstream is connected with the two-phase inflow hole; the upstream of the steam measurement pipeline is connected with the steam outlet; the upstream of the weighing measurement pipeline is connected with the liquid phase outlet of the steam-water separator. The crevasse simulation system with the two-phase discharge flow measurement function uses the steam-water separator to separate two-phase critical flow into single-phase saturated steam and single-phase saturated water and combines a steam flow meter with a weighing method to measure the crevasse discharge two-phase critical flow, and the problem that the critical flow discharged from a high-temperature high-pressure fluid crevasse is difficult to measure is solved; by means of the crevasse discharge simulation pipeline, the crevasse simulation piece, crevasse control valve and crevasse measurement system arrangement problem is solved.

Description

technical field [0001] The invention relates to the field of experimental research on two-phase critical flow, in particular to a breach simulation system capable of measuring two-phase discharge flow and a measurement method thereof. Background technique [0002] In the field of nuclear technology, the breach loss of water accident is one of the reactor accidents with a relatively high probability of occurrence. Two-phase critical flow during loss of water accident is of great significance to reactor safety. This is because the critical flow rate of the breach determines the loss rate of the core coolant and the pressure relief rate of the primary circuit system. Its size not only directly affects the cooling capacity of the core, but also determines the actions of various safety and emergency systems. time. So far, some experimental studies on two-phase critical flow have been carried out internationally, and various physical models (such as the Henry-Fauske non-equilibr...

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Problems solved by technology

If conventional single-phase fluid flow measurement instruments are used, such as Venturi flowmeters, vortex flowmeters, etc., since their measurement principles are based on single-phase fluids, it is difficult to give accurate flow values ​​of vapor-liquid two-phase flow

If the conventional weighing method is used, only the total flow rate of the vapor-liquid two-phase can be given, and because the two-phase fluid discharged through the breach has a high heat capacity and contains a large amount of water vapor, especially for the discharge through a large breach, when When the sprayed fluid enters the open container used in the weighing method, it may not be cooled in time and a large amount of steam will be volatilized into the atmosphere, which will affect the accuracy of critical flow measurement

In the prior art, there is a method for separating the two-phase flow into measurable single-phase water and single-phase gas / vapor by using a steam-water separator. Measure single-phase gas / steam flow, but in this method, quartz glass is difficult to withstand the thermal shock of the two-phase critical flow discharge fluid in the loss of water accident, and at the same time, the temperature and density of the liquid phase in the discharge fluid may change with time under the action of the safety system. Changes occur, the quartz glass only measures the volume flow of the liquid phase and cannot give the mass flow, and the scale of the quartz glass is manually read, it is difficult to give an accurate instantaneous flow change value

In addition, for the critical flow sprayed by a large breach, the liquid phase flow rate is relatively large, and it is easy to exceed the range of ordinary measuring containers or measuring devices, making it impossible to measure. If the measured liquid phase fluid is discharged from the container or device when the measurement is stopped midway, Since the sprayed liquid-phase fluid has been entering the measuring container or device, it is not only difficult to completely discharge the measured liquid-phase fluid in the container or device, but also the effective test data of a large time range will be lost in the experiment

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