Capacitive sensor for measuring phase volume fraction of two-phase flow and optimization method of structural parameters

Abstract

The invention provides a capacitive sensor for measuring the phase volume fraction of a two-phase flow and an optimization method of structural parameters. According to the flow characteristics of theannular gas-liquid two-phase flow, the moisture content and the gas content can be accurately measured by using electrode structures with different shapes; in the measurement process, the gas-liquidtwo-phase flow flowing state in a pipeline is subjected to real-time on-line imaging display by using a tomographic technology, so as to be helpful to deeply understand the flowing basic law of the gas-liquid two-phase flow and conveniently analyze the accuracy of the phase volume fraction measurement result. The sensor provided by the invention has the advantages of simple structure, low cost, non-contact real-time on-line measurement and the like. At the same time, the method for optimization of the sensor structure parameters is given and has many beneficial effects based on the sensitive field distribution of the structural sensor.

Description

technical field [0001] The invention relates to the technical field of gas-liquid two-phase flow detection sensors, in particular to a capacitive sensor for measuring holdup of two-phase flow and a structural parameter optimization method thereof. Background technique [0002] Gas-liquid two-phase flow widely exists in many industrial processes such as petroleum, chemical industry, energy, power and pharmaceuticals. The flow characteristics are very complex, which makes the measurement of two-phase flow parameters very difficult. Phase holdup is one of the important parameters to characterize the characteristics of gas-liquid two-phase flow, and it is an important basis for calculating the mixing density of two-phase flow, the separation flow rate and the flow state of two-phase medium. Its accurate measurement is critical to industrial process control, management and reliable operation. [0003] Existing methods for measuring holdup of gas-liquid two-phase flow mainly inc...

AI Technical Summary

Problems solved by technology

Among the above methods, the quick-closing valve method is low in cost, accurate and reliable, but it will cut off the fluid flow during the measurement process, so it cannot be measured in real time and online

The optical method based on visible light requires that the measured medium can pass through visible light, and its application range is limited because the light emitting and receiving components are easily polluted.

The measurement sensitivity of the ray method is low, the cost of the sensor is high, and the safety requirements are high

The high-speed camera method takes high-speed dynamic shots of the fluid flow interface, which can reflect the structural characteristics of the interface fluctuations in detail. However, due to high requirements on the operator, there are optical problems such as lighting and focusing, and the scope of application is limited.

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