Non-contact conductive gas/liquid two-phase flow pattern identifying device and method

Abstract

The invention discloses a non-contact conductive gas / liquid two-phase flow pattern identifying device and method thereof. The device comprises a gas / liquid two-phase flow measuring pipeline, an alternating-current excitation source, a capacitive coupling non-contact conductive sensor, a temperature sensor, a current / voltage conversion unit, an alternating-current rectifying unit, a filter unit, a direct-current amplifying unit, a data acquisition module and a computer. The method comprises the following steps: firstly, the capacitive coupling non-contact conductive sensor obtains conductance signals of flows of the gas / liquid two phases; then, characteristic values of the obtained conductance signals are extracted via a time domain collection method and a Fourier transformation method; and finally, the characteristic values are input to a flow pattern classifier for online identification. The device and method provided by the invention can effectively prevent reduction of the conductivity measurement performance caused by polarization effects and electrochemical corrosion effects, and improve the reliability and robustness of a flow pattern identification system; furthermore, the device is simple in structure, easy to mount, low in cost and the like. The invention provides a novel effective path for measuring parameters of the gas / liquid two phases in the fields such as energy source, petrochemical industry and the like.

Description

technical field [0001] The invention relates to the field of multiphase flow measurement, in particular to a non-contact conduction gas-liquid two-phase flow pattern identification device and method. Background technique [0002] Gas-liquid two-phase flow systems are widely used in energy, power, petrochemical and other industrial fields. The flow pattern identification of gas-liquid two-phase flow is of great significance to the parameter measurement of two-phase flow system. Due to the complex flow characteristics of two-phase flow, existing flow pattern identification methods are difficult to meet the increasing demands in industrial applications. [0003] The flow pattern identification and parameter detection method of gas-liquid two-phase flow based on conductometric measurement has the advantages of fast response and strong anti-interference. Therefore, for a long time, the method based on conductometric measurement has attracted the attention of many researchers in ...

AI Technical Summary

Problems solved by technology

However, in these traditional flow pattern identification methods, the conductivity measurement technology used is contact measurement

In actual industrial applications, the conductivity probe or measuring electrode is in direct contact with the fluid, which is easily polarized and electrochemically corroded, resulting in a decrease in the performance of conductivity measurement and affecting the reliability and accuracy of flow pattern identification.

Therefore, the two-phase flow pattern identification method based on contact conductometric measurement is difficult to meet the needs of long-term use in the industry

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