A two-phase flow split-phase holdup conductivity sensor and its structure parameter optimization method

Abstract

The invention provides a two-phase flow separation phase holdup conductivity sensor. The sensor is composed of a conductive ring layer and an excitation electrode pair and a measurement electrode pair attached to it. The excitation electrode and the measurement electrode are on the upper diameter of the pipe wall of the conductive ring layer. Symmetrically distributed in a spiral at an angle of 180 degrees. At the same time, a structural parameter optimization method based on the above-mentioned sensor structure is also provided. The beneficial effects of the present invention are aimed at the real-time measurement of the phase holdup of two-phase flow, which overcomes the shortcoming that the measurement electrode is in contact with the non-conductive substance in the traditional conductivity sensor, which causes the measurement electrode to float, and provides a conductivity type electrical sensor based on its analysis The model gives the expression of the sensitivity distribution at any point on the two-dimensional sensor cross-section, which can quickly optimize the structural parameters. Belonging to non-invasive rapid measurement, the measurement range is widened, and the cost is low.

Description

technical field [0001] The invention relates to a detection device, in particular to a two-phase flow split-phase holdup conductivity sensor and a structural parameter optimization method thereof. Background technique [0002] Phase holdup is an important parameter for online real-time measurement of two-phase flow, which is of great significance in industrial production and oil transportation. Because the electrical method has the advantages of non-invasive measurement, fast response, safety and reliability, low cost, easy installation, and durability, it is suitable for industrial online applications. When the fluid composition in the pipeline changes, the corresponding electrical parameters change. Through a set of electrode arrays arranged on the inner or outer wall of the pipeline, the change of the electrical signal caused by the change of the fluid composition is measured. According to the electrical measurement between the measuring plates value, the phase concentra...

AI Technical Summary

Problems solved by technology

However, the two-phase flow process is very complicated, the solid phase distribution in the sensor is uneven, and the flow pattern changes rapidly; at the same time, because the detection field of the electrical sensor is a "soft field", its sensitivity distribution changes with the phase distribution, and its inherent sensitivity distribution Inhomogeneity will lead to measurement results not only related to phase concentration, but also its measurement accuracy is affected by phase distribution and flow pattern changes

[0003] At present, the electrode array of the two-phase flow separation phase holdup conductivity sensor designed for industrial applications is generally in contact with the measured substance. The electrodes are floating, which can easily lead to saturation of the resistance / conductance measurement circuit, limiting its measurement range and accuracy

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